Publications

@article{baspin2024wire,

title = {Wire codes},

author = { Nouédyn Baspin and Dominic Williamson},

year  = {2024},

date = {2024-01-01},

journal = {arXiv preprint arXiv:2410.10194},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{williamson2024layer,

title = {Layer Codes},

author = { Dominic J. Williamson and Nouédyn Baspin},

year  = {2024},

date = {2024-01-01},

journal = {Nature Communications},

volume = {15},

pages = {9528},

publisher = {Nature Portfolio},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{aitchison2024boundaries,

title = {Boundaries and defects in the cubic code},

author = {Cory T Aitchison and Daniel Bulmash and Arpit Dua and Andrew C Doherty and Dominic J Williamson},

year  = {2024},

date = {2024-01-01},

journal = {Physical Review B},

volume = {109},

number = {20},

pages = {205125},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Stace2024,

title = {Optimized Bayesian system identification in quantum devices},

author = {Thomas M. Stace and Jiayin Chen and Li Li and Viktor S. Perunicic and Andre R. R. Carvalho and Michael Hush and Christophe H. Valahu and Ting Rei Tan and Michael J. Biercuk},

url = {https://link.aps.org/doi/10.1103/PhysRevApplied.21.014012},

doi = {10.1103/PhysRevApplied.21.014012},

year  = {2024},

date = {2024-01-01},

journal = {Phys. Rev. Appl.},

volume = {21},

issue = {1},

pages = {014012},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pham2024,

title = {In Situ-Tunable Spin–Spin Interactions in a Penning Trap with In-Bore Optomechanics},

author = {Joseph H. Pham and Julian Y. Z. Jee and Alexander Rischka and Michael J. Biercuk and Robert N. Wolf},

url = {https://advanced.onlinelibrary.wiley.com/doi/abs/10.1002/qute.202400086},

doi = {https://doi.org/10.1002/qute.202400086},

year  = {2024},

date = {2024-01-01},

journal = {Advanced Quantum Technologies},

volume = {7},

number = {9},

pages = {2400086},

abstract = {Abstract Experimental implementations of quantum simulation must balance control-field-induced decoherence with the controllability of the quantum system. The ratio of coherent interaction strength to decoherence induced by stimulated emission in atomic systems is typically determined by hardware constraints, limiting the flexibility needed to explore different operating regimes. Here, an optomechanical system is presented for in situ tuning of the coherent spin-motion and spin-spin interaction strength in 2D ion crystals in a Penning trap. Enabled by precision closed-loop piezo-actuated positioners integrated into the confined space of a superconducting magnet's bore, the system allows tuning of the angle-of-incidence of Raman laser beams up to $þeta _mathrmODFapprox 28^circ$, governing the ratio of coherent to incoherent light-matter interaction for fixed optical power. System characterization involves measurements of the induced mean-field spin precession under the application of an optical dipole force in ion crystals cooled below the Doppler limit through electromagnetically induced transparency cooling. These experiments show approximately a $times 2$ variation in the coherent to incoherent interaction ratio with changing $þeta _textODF$, consistent with theoretical predictions. The system stability is characterized over 6000 s, resulting in a drift rate of $0.002^circ$ h–1. These technical developments will be crucial in future quantum simulations and sensing applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Webster_2023,

title = {Transversal diagonal logical operators for stabiliser codes},

author = {Mark A Webster and Armanda O Quintavalle and Stephen D Bartlett},

url = {http://dx.doi.org/10.1088/1367-2630/acfc5f},

doi = {10.1088/1367-2630/acfc5f},

issn = {1367-2630},

year  = {2023},

date = {2023-10-01},

journal = {New Journal of Physics},

volume = {25},

number = {10},

pages = {103018},

publisher = {IOP Publishing},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Ellison_2023,

title = {Pauli topological subsystem codes from Abelian anyon theories},

author = {Tyler D. Ellison and Yu-An Chen and Arpit Dua and Wilbur Shirley and Nathanan Tantivasadakarn and Dominic J. Williamson},

url = {http://dx.doi.org/10.22331/q-2023-10-12-1137},

doi = {10.22331/q-2023-10-12-1137},

issn = {2521-327X},

year  = {2023},

date = {2023-10-01},

journal = {Quantum},

volume = {7},

pages = {1137},

publisher = {Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Harper_2023,

title = {Learning Correlated Noise in a 39-Qubit Quantum Processor},

author = {Robin Harper and Steven T. Flammia},

url = {http://dx.doi.org/10.1103/PRXQuantum.4.040311},

doi = {10.1103/prxquantum.4.040311},

issn = {2691-3399},

year  = {2023},

date = {2023-10-01},

journal = {PRX Quantum},

volume = {4},

number = {4},

publisher = {American Physical Society (APS)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Jain_2023,

title = {Improved quantum error correction with randomized compiling},

author = {Aditya Jain and Pavithran Iyer and Stephen D. Bartlett and Joseph Emerson},

url = {http://dx.doi.org/10.1103/PhysRevResearch.5.033049},

doi = {10.1103/physrevresearch.5.033049},

issn = {2643-1564},

year  = {2023},

date = {2023-07-01},

journal = {Physical Review Research},

volume = {5},

number = {3},

publisher = {American Physical Society (APS)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Alase_2023,

title = {Matrix permanent and determinant from a spin system},

author = {Abhijeet Alase and Owen Doty and David L. Feder},

url = {http://dx.doi.org/10.1103/PhysRevA.108.012207},

doi = {10.1103/physreva.108.012207},

issn = {2469-9934},

year  = {2023},

date = {2023-07-01},

journal = {Physical Review A},

volume = {108},

number = {1},

publisher = {American Physical Society (APS)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Kusmierek_2023,

title = {Higher-order mean-field theory of chiral waveguide QED},

author = {Kasper Jan Kusmierek and Sahand Mahmoodian and Martin Cordier and Jakob Hinney and Arno Rauschenbeutel and Maximilian Schemmer and Philipp Schneeweiss and Jürgen Volz and Klemens Hammerer},

url = {http://dx.doi.org/10.21468/SciPostPhysCore.6.2.041},

doi = {10.21468/scipostphyscore.6.2.041},

issn = {2666-9366},

year  = {2023},

date = {2023-06-01},

journal = {SciPost Physics Core},

volume = {6},

number = {2},

publisher = {Stichting SciPost},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Bartholomew2023,

title = {High-resolution spectroscopic techniques for studying rare-earth ions in nanoparticles},

author = {J. G. Bartholomew and Karmel Oliveira Lima and Alban Ferrier and Adam Kinos and Jenny Karlsson and Lars Rippe and Andreas Walther and Ivan Scheblykin and Stefan Kröll and Philippe Goldner},

url = {https://doi.org/10.1016/j.jlumin.2023.119743 https://linkinghub.elsevier.com/retrieve/pii/S0022231323000765},

doi = {10.1016/j.jlumin.2023.119743},

issn = {00222313},

year  = {2023},

date = {2023-05-01},

journal = {Journal of Luminescence},

volume = {257},

pages = {119743},

abstract = {Rare-earth doped nanoparticles can exhibit narrow optical and spin linewidths at low temperatures. These outstanding properties for nanomaterials make them attractive for quantum technologies based on optically addressable spins such as quantum memories and computers. Although accurate linewidth measurements have been reported using, for example, spectral hole burning or photon echo techniques, so far they have been mostly restricted to large ensembles of particles. Being able to extend linewidths measurements to few and single particles is particularly important in view of their integration in nanophotonic devices. In this paper, we present techniques for determining inhomogeneous and homogeneous linewidths of small ensembles of rare-earth ions in doped nanoparticles with high signal-to-noise ratios for convenient integration times. Using these techniques we have observed property variations for particles from the same synthesis, a first step towards their optimization for applications in quantum technologies.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Wolf2023,

title = {Efficient site-resolved imaging and spin-state detection in dynamic two-dimensional ion crystals},

author = {Robert N. Wolf and Joseph H. Pham and Julian Y. Z. Jee and Alexander Rischka and Michael J. Biercuk},

doi = {https://doi.org/10.48550/arXiv.2303.10801},

year  = {2023},

date = {2023-03-01},

urldate = {2023-03-01},

abstract = {Resolving the locations and discriminating the spin states of individual trapped ions with high fidelity is critical for a large class of applications in quantum computing, simulation, and sensing. We report on a method for high-fidelity state discrimination in large two-dimensional (2D) crystals with over 100 trapped ions in a single trapping region, combining a novel hardware detector and an artificial neural network. A high-data-rate, spatially resolving, single-photon sensitive timestamping detector performs efficient single-shot detection of 2D crystals in a Penning trap, exhibiting rotation at about $25,mathrmkHz$. We then train an artificial neural network to process the fluorescence photon data in the rest frame of the rotating crystal in order to identify ion locations with a precision of $~90%$, accounting for substantial illumination inhomogeneity across the crystal. Finally, employing a time-binned state detection method, we arrive at an average spin-state detection fidelity of $94(1)%$. This technique can be used to analyze spatial and temporal correlations in arrays of hundreds of trapped-ion qubits.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Becher2023,

title = {Rare Earth Ions for Optical Quantum Technologies, Section 3, 2023 roadmap for materials for quantum technologies},

author = {Christoph Becher and Weibo Gao and Swastik Kar and Christian D Marciniak and Thomas Monz and J. G. Bartholomew and Philippe Goldner and Huanqian Loh and Elizabeth Marcellina and Kuan Eng Johnson Goh and Teck Seng Koh and Bent Weber and Zhao Mu and Jeng-Yuan Tsai and Qimin Yan and Tobias Huber-Loyola and Sven Höfling and Samuel Gyger and Stephan Steinhauer and Val Zwiller},

url = {http://arxiv.org/abs/2012.13408 http://dx.doi.org/10.1103/PhysRevLett.127.040503 https://link.aps.org/doi/10.1103/PhysRevLett.127.040503},

doi = {10.1088/2633-4356/aca3f2},

issn = {2633-4356},

year  = {2023},

date = {2023-03-01},

journal = {Materials for Quantum Technology},

volume = {3},

number = {1},

pages = {012501},

abstract = {Quantum technologies are poised to move the foundational principles of quantum physics to the forefront of applications. This roadmap identifies some of the key challenges and provides insights on material innovations underlying a range of exciting quantum technology frontiers. Over the past decades, hardware platforms enabling different quantum technologies have reached varying levels of maturity. This has allowed for first proof-of-principle demonstrations of quantum supremacy, for example quantum computers surpassing their classical counterparts, quantum communication with reliable security guaranteed by laws of quantum mechanics, and quantum sensors uniting the advantages of high sensitivity, high spatial resolution, and small footprints. In all cases, however, advancing these technologies to the next level of applications in relevant environments requires further development and innovations in the underlying materials. From a wealth of hardware platforms, we select representative and promising material systems in currently investigated quantum technologies. These include both the inherent quantum bit systems and materials playing supportive or enabling roles, and cover trapped ions, neutral atom arrays, rare earth ion systems, donors in silicon, color centers and defects in wide-band gap materials, two-dimensional materials and superconducting materials for single-photon detectors. Advancing these materials frontiers will require innovations from a diverse community of scientific expertise, and hence this roadmap will be of interest to a broad spectrum of disciplines.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Rochman2023,

title = {Microwave-to-optical transduction with erbium ions coupled to planar photonic and superconducting resonators},

author = {Jake Rochman and Tian Xie and J. G. Bartholomew and K. C. Schwab and Andrei Faraon},

url = {https://www.nature.com/articles/s41467-023-36799-0},

doi = {10.1038/s41467-023-36799-0},

issn = {2041-1723},

year  = {2023},

date = {2023-03-01},

journal = {Nature Communications},

volume = {14},

number = {1},

pages = {1153},

abstract = {Optical quantum networks can connect distant quantum processors to enable secure quantum communication and distributed quantum computing. Superconducting qubits are a leading technology for quantum information processing but cannot couple to long-distance optical networks without an efficient, coherent, and low noise interface between microwave and optical photons. Here, we demonstrate a microwave-to-optical transducer using an ensemble of erbium ions that is simultaneously coupled to a superconducting microwave resonator and a nanophotonic optical resonator. The coherent atomic transitions of the ions mediate the frequency conversion from microwave photons to optical photons and using photon counting we observed device conversion efficiency approaching 10 −7 . With pulsed operation at a low duty cycle, the device maintained a spin temperature below 100 mK and microwave resonator heating of less than 0.15 quanta.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Smith_2023,

title = {Local Predecoder to Reduce the Bandwidth and Latency of Quantum Error Correction},

author = {Samuel C. Smith and Benjamin J. Brown and Stephen D. Bartlett},

url = {http://dx.doi.org/10.1103/PhysRevApplied.19.034050},

doi = {10.1103/physrevapplied.19.034050},

issn = {2331-7019},

year  = {2023},

date = {2023-03-01},

journal = {Physical Review Applied},

volume = {19},

number = {3},

publisher = {American Physical Society (APS)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Miguel_2023,

title = {A cellular automaton decoder for a noise-bias tailored color code},

author = {Jonathan F. San Miguel and Dominic J. Williamson and Benjamin J. Brown},

url = {http://dx.doi.org/10.22331/q-2023-03-09-940},

doi = {10.22331/q-2023-03-09-940},

issn = {2521-327X},

year  = {2023},

date = {2023-03-01},

journal = {Quantum},

volume = {7},

pages = {940},

publisher = {Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tomm_2023,

title = {Photon bound state dynamics from a single artificial atom},

author = {Natasha Tomm and Sahand Mahmoodian and Nadia O. Antoniadis and Rüdiger Schott and Sascha R. Valentin and Andreas D. Wieck and Arne Ludwig and Alisa Javadi and Richard J. Warburton},

url = {http://dx.doi.org/10.1038/s41567-023-01997-6},

doi = {10.1038/s41567-023-01997-6},

issn = {1745-2481},

year  = {2023},

date = {2023-03-01},

journal = {Nature Physics},

volume = {19},

number = {6},

pages = {857–862},

publisher = {Springer Science and Business Media LLC},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Qiu_2023,

title = {Broadband squeezed microwaves and amplification with a Josephson travelling-wave parametric amplifier},

author = {Jack Y. Qiu and Arne Grimsmo and Kaidong Peng and Bharath Kannan and Benjamin Lienhard and Youngkyu Sung and Philip Krantz and Vladimir Bolkhovsky and Greg Calusine and David Kim and Alex Melville and Bethany M. Niedzielski and Jonilyn Yoder and Mollie E. Schwartz and Terry P. Orlando and Irfan Siddiqi and Simon Gustavsson and Kevin P. O’Brien and William D. Oliver},

url = {http://dx.doi.org/10.1038/s41567-022-01929-w},

doi = {10.1038/s41567-022-01929-w},

issn = {1745-2481},

year  = {2023},

date = {2023-02-01},

journal = {Nature Physics},

volume = {19},

number = {5},

pages = {706–713},

publisher = {Springer Science and Business Media LLC},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Valahu2023,

title = {Direct observation of geometric-phase interference in dynamics around a conical intersection},

author = {Christophe H. Valahu and Vanessa C. Olaya-Agudelo and Ryan J. MacDonell and Tomas Navickas and Arjun D. Rao and Maverick J. Millican and Juan B. Pérez-Sánchez and Joel Yuen-Zhou and Michael J. Biercuk and Cornelius Hempel and Ting Rei Tan and Ivan Kassal},

doi = {10.1038/s41557-023-01300-3},

year  = {2023},

date = {2023-01-01},

journal = {Nature Chem.},

volume = {15},

number = {11},

pages = {1503},

publisher = {Springer Science and Business Media LLC},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Berkman2023,

title = {Observing Er3+ Sites in Si With an In Situ Single-Photon Detector},

author = {Ian R Berkman and Alexey Lyasota and Gabriele G. Boo and J. G. Bartholomew and Brett C Johnson and Jeffrey C. McCallum and Bin-Bin Xu and Shouyi Xie and Rose L Ahlefeldt and Matthew J Sellars and Chunming Yin and Sven Rogge},

url = {https://link.aps.org/doi/10.1103/PhysRevApplied.19.014037},

doi = {10.1103/PhysRevApplied.19.014037},

issn = {2331-7019},

year  = {2023},

date = {2023-01-01},

urldate = {2023-01-01},

journal = {Physical Review Applied},

volume = {19},

number = {1},

pages = {014037},

abstract = {We present a flexible method to study the optical properties of an Er 3+ ensemble in Si accessed via resonant excitation and in situ single-photon detection. The technique allows an efficient resonant pho-toluminescence detection of optically active centers with weak oscillator strength in transparent crystals without the need for nanofabrication on the sample. We observe 70 Er 3+ resonances in Si, of which 62 resonances have not been observed in the literature, with optical lifetimes ranging from 0.5 to 1.5 ms. We observe inhomogeneous broadening of less than 400 MHz and an upper bound on the homogeneous linewidth of 0.75 and 1.4 MHz for two separate resonances. These narrow, stable resonances confirm Er 3+ in Si as a promising quantum information candidate. We discuss the use of this technique for rapid characterization of future samples, with the aim of enhancing the prevalence of sites which are favorable for quantum information applications.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{kass2023rf,

title = {An rf Quantum Capacitance Parametric Amplifier},

author = {A El Kass and CT Jin and JD Watson and GC Gardner and S Fallahi and MJ Manfra and DJ Reilly},

year  = {2023},

date = {2023-01-01},

journal = {arXiv preprint arXiv:2304.13227},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Frembs_2023,

title = {Hierarchies of resources for measurement-based quantum computation},

author = {Markus Frembs and Sam Roberts and Earl T Campbell and Stephen D Bartlett},

url = {http://dx.doi.org/10.1088/1367-2630/acaee2},

doi = {10.1088/1367-2630/acaee2},

issn = {1367-2630},

year  = {2023},

date = {2023-01-01},

journal = {New Journal of Physics},

volume = {25},

number = {1},

pages = {013002},

publisher = {IOP Publishing},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{MacDonell2023,

title = {Predicting molecular vibronic spectra using time-domain analog quantum simulation},

author = {Ryan J. MacDonell and Tomas Navickas and Tim F. Wohlers-Reichel and Christophe H. Valahu and Arjun D. Rao and Maverick J. Millican and Michael A. Currington and Michael J. Biercuk and Ting Rei Tan and Cornelius Hempel and Ivan Kassal},

year  = {2023},

date = {2023-01-01},

journal = {Chem. Sci.},

volume = {14},

pages = {9439},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Witt2023,

title = {Spin-relaxation mechanisms in InAs quantum well heterostructures},

author = {J. D. S. Witt and S. J. Pauka and G. C. Gardner and S. Gronin and T. Wang and C. Thomas and M. J. Manfra and D. J. Reilly and M. C. Cassidy},

doi = {10.1063/5.0135297},

issn = {00036951},

year  = {2023},

date = {2023-01-01},

journal = {Applied Physics Letters},

volume = {122},

issue = {8},

publisher = {American Institute of Physics Inc.},

abstract = {Spin-orbit interaction and spin-relaxation mechanisms of a shallow InAs quantum well heterostructure are investigated by magnetoconductance measurements as a function of an applied top-gate voltage. The data are fit using a Iordanskii-Lyanda-Geller-Pikus model and two distinct transport regimes are identified. The spin-orbit interaction splitting energy is extracted from the fits to the data, which also displays two distinct regimes. The different regimes exhibit different spin-scattering mechanisms, the identification of which is of relevance for device platforms of reduced dimensionality which utilize the spin-orbit interaction.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Aghaee2023,

title = {InAs-Al hybrid devices passing the topological gap protocol},

author = {Morteza Aghaee and Arun Akkala and Zulfi Alam and Rizwan Ali and Alejandro Alcaraz Ramirez and Mariusz Andrzejczuk and Andrey E. Antipov and Pavel Aseev and Mikhail Astafev and Bela Bauer and Jonathan Becker and Srini Boddapati and Frenk Boekhout and Jouri Bommer and Tom Bosma and Leo Bourdet and Samuel Boutin and Philippe Caroff and Lucas Casparis and Maja Cassidy and Sohail Chatoor and Anna Wulf Christensen and Noah Clay and William S. Cole and Fabiano Corsetti and Ajuan Cui and Paschalis Dalampiras and Anand Dokania and Gijs De Lange and Michiel De Moor and Juan Carlos Estrada Saldaña and Saeed Fallahi and Zahra Heidarnia Fathabad and John Gamble and Geoff Gardner and Deshan Govender and Flavio Griggio and Ruben Grigoryan and Sergei Gronin and Jan Gukelberger and Esben Bork Hansen and Sebastian Heedt and Jesús Herranz Zamorano and Samantha Ho and Ulrik Laurens Holgaard and Henrik Ingerslev and Linda Johansson and Jeffrey Jones and Ray Kallaher and Farhad Karimi and Torsten Karzig and Cameron King and Maren Elisabeth Kloster and Christina Knapp and Dariusz Kocon and Jonne Koski and Pasi Kostamo and Peter Krogstrup and Mahesh Kumar and Tom Laeven and Thorvald Larsen and Kongyi Li and Tyler Lindemann and Julie Love and Roman Lutchyn and Morten Hannibal Madsen and Michael Manfra and Signe Markussen and Esteban Martinez and Robert McNeil and Elvedin Memisevic and Trevor Morgan and Andrew Mullally and Chetan Nayak and Jens Nielsen and William Hvidtfelt Padkær Nielsen and Bas Nijholt and Anne Nurmohamed and Eoin O'Farrell and Keita Otani and Sebastian Pauka and Karl Petersson and Luca Petit and Dmitry I. Pikulin and Frank Preiss and Marina Quintero-Perez and Mohana Rajpalke and Katrine Rasmussen and Davydas Razmadze and Outi Reentila and David Reilly and Richard Rouse and Ivan Sadovskyy and Lauri Sainiemi and Sydney Schreppler and Vadim Sidorkin and Amrita Singh and Shilpi Singh and Sarat Sinha and Patrick Sohr and Tomaš Stankevič and Lieuwe Stek and Henri Suominen and Judith Suter and Vicky Svidenko and Sam Teicher and Mine Temuerhan and Nivetha Thiyagarajah and Raj Tholapi and Mason Thomas and Emily Toomey and Shivendra Upadhyay and Ivan Urban and Saulius Vaitiekėnas and Kevin Van Hoogdalem and David Van Woerkom and Dmitrii V. Viazmitinov and Dominik Vogel and Steven Waddy and John Watson and Joseph Weston and Georg W. Winkler and Chung Kai Yang and Sean Yau and Daniel Yi and Emrah Yucelen and Alex Webster and Roland Zeisel and Ruichen Zhao},

doi = {10.1103/PhysRevB.107.245423},

issn = {24699969},

year  = {2023},

date = {2023-01-01},

journal = {Physical Review B},

volume = {107},

issue = {24},

publisher = {American Physical Society},

abstract = {We present measurements and simulations of semiconductor-superconductor heterostructure devices that are consistent with the observation of topological superconductivity and Majorana zero modes. The devices are fabricated from high-mobility two-dimensional electron gases in which quasi-one-dimensional wires are defined by electrostatic gates. These devices enable measurements of local and nonlocal transport properties and have been optimized via extensive simulations to ensure robustness against nonuniformity and disorder. Our main result is that several devices, fabricated according to the design's engineering specifications, have passed the topological gap protocol defined in Pikulin et al. (arXiv:2103.12217). This protocol is a stringent test composed of a sequence of three-terminal local and nonlocal transport measurements performed while varying the magnetic field, semiconductor electron density, and junction transparencies. Passing the protocol indicates a high probability of detection of a topological phase hosting Majorana zero modes as determined by large-scale disorder simulations. Our experimental results are consistent with a quantum phase transition into a topological superconducting phase that extends over several hundred millitesla in magnetic field and several millivolts in gate voltage, corresponding to approximately one hundred microelectronvolts in Zeeman energy and chemical potential in the semiconducting wire. These regions feature a closing and reopening of the bulk gap, with simultaneous zero-bias conductance peaks at both ends of the devices that withstand changes in the junction transparencies. The extracted maximum topological gaps in our devices are 20-60μeV. This demonstration is a prerequisite for experiments involving fusion and braiding of Majorana zero modes.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{williamson2023designer,

title = {Designer non-Abelian fractons from topological layers},

author = { Dominic J Williamson and Meng Cheng},

year  = {2023},

date = {2023-01-01},

journal = {Physical Review B},

volume = {107},

number = {3},

pages = {035103},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{rayhaun2023higher,

title = {Higher-form subsystem symmetry breaking: Subdimensional criticality and fracton phase transitions},

author = { Brandon Rayhaun and Dominic Williamson},

year  = {2023},

date = {2023-01-01},

journal = {SciPost Physics},

volume = {15},

number = {1},

pages = {017},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{song2023topological,

title = {Topological defect network representations of fracton stabilizer codes},

author = { Zijian Song and Arpit Dua and Wilbur Shirley and Dominic J Williamson},

year  = {2023},

date = {2023-01-01},

journal = {PRX Quantum},

volume = {4},

number = {1},

pages = {010304},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Iyer_2022,

title = {Efficient diagnostics for quantum error correction},

author = {Pavithran Iyer and Aditya Jain and Stephen D. Bartlett and Joseph Emerson},

url = {http://dx.doi.org/10.1103/PhysRevResearch.4.043218},

doi = {10.1103/physrevresearch.4.043218},

issn = {2643-1564},

year  = {2022},

date = {2022-12-01},

journal = {Physical Review Research},

volume = {4},

number = {4},

publisher = {American Physical Society (APS)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{MacDonell2022,

title = {Predicting molecular vibronic spectra using time-domain analog quantum simulation},

author = {Ryan J. MacDonell and Tomas Navickas and Tim F. Wohlers-Reichel and Christophe H. Valahu and Arjun D. Rao and Maverick J. Millican and Michael A. Currington and Michael J. Biercuk and Ting Rei Tan and Cornelius Hempel and Ivan Kassal},

year  = {2022},

date = {2022-09-01},

abstract = {Spectroscopy is one of the most accurate probes of the molecular world. However, predicting molecular spectra accurately is computationally difficult because of the presence of entanglement between electronic and nuclear degrees of freedom. Although quantum computers promise to reduce this computational cost, existing quantum approaches rely on combining signals from individual eigenstates, an approach that is difficult to scale because the number of eigenstates grows exponentially with molecule size. Here, we introduce a method for scalable analog quantum simulation of molecular spectroscopy, by performing simulations in the time domain. Our approach can treat more complicated molecular models than previous ones, requires fewer approximations, and can be extended to open quantum systems with minimal overhead. We present a direct mapping of the underlying problem of time-domain simulation of molecular spectra to the degrees of freedom and control fields available in a trapped-ion quantum simulator. We experimentally demonstrate our algorithm on a trapped-ion device, exploiting both intrinsic electronic and motional degrees of freedom, showing excellent quantitative agreement for a single-mode vibronic photoelectron spectrum of SO$_2$.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{PhysRevResearch.4.033229,

title = {Doppler and sympathetic cooling for the investigation of short-lived radioactive ions},

author = {S. Sels and F. M. Maier and M. Au and P. Fischer and C. Kanitz and V. Lagaki and S. Lechner and E. Leistenschneider and D. Leimbach and E. M. Lykiardopoulou and A. A. Kwiatkowski and T. Manovitz and Y. N. Vila Gracia and G. Neyens and P. Plattner and S. Rothe and L. Schweikhard and M. Vilen and R. N. Wolf and S. Malbrunot-Ettenauer},

url = {https://link.aps.org/doi/10.1103/PhysRevResearch.4.033229},

doi = {10.1103/PhysRevResearch.4.033229},

year  = {2022},

date = {2022-09-01},

journal = {Phys. Rev. Res.},

volume = {4},

issue = {3},

pages = {033229},

publisher = {American Physical Society},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Webster_2022b,

title = {The XP Stabiliser Formalism: a Generalisation of the Pauli Stabiliser Formalism with Arbitrary Phases},

author = {Mark A. Webster and Benjamin J. Brown and Stephen D. Bartlett},

url = {http://dx.doi.org/10.22331/q-2022-09-22-815},

doi = {10.22331/q-2022-09-22-815},

issn = {2521-327X},

year  = {2022},

date = {2022-09-01},

journal = {Quantum},

volume = {6},

pages = {815},

publisher = {Verein zur Forderung des Open Access Publizierens in den Quantenwissenschaften},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{B_ttcher_2022,

title = {Parametric longitudinal coupling between a high-impedance superconducting resonator and a semiconductor quantum dot singlet-triplet spin qubit},

author = {C. G. L. Bøttcher and S. P. Harvey and S. Fallahi and G. C. Gardner and M. J. Manfra and U. Vool and S. D. Bartlett and A. Yacoby},

url = {http://dx.doi.org/10.1038/s41467-022-32236-w},

doi = {10.1038/s41467-022-32236-w},

issn = {2041-1723},

year  = {2022},

date = {2022-08-01},

journal = {Nature Communications},

volume = {13},

number = {1},

publisher = {Springer Science and Business Media LLC},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Stephen_2022,

title = {Fractionalization of subsystem symmetries in two dimensions},

author = {David T. Stephen and Arpit Dua and José Garre-Rubio and Dominic J. Williamson and Michael Hermele},

url = {http://dx.doi.org/10.1103/PhysRevB.106.085104},

doi = {10.1103/physrevb.106.085104},

issn = {2469-9969},

year  = {2022},

date = {2022-08-01},

journal = {Physical Review B},

volume = {106},

number = {8},

publisher = {American Physical Society (APS)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pashayan_2022,

title = {Fast Estimation of Outcome Probabilities for Quantum Circuits},

author = {Hakop Pashayan and Oliver Reardon-Smith and Kamil Korzekwa and Stephen D. Bartlett},

url = {http://dx.doi.org/10.1103/PRXQuantum.3.020361},

doi = {10.1103/prxquantum.3.020361},

issn = {2691-3399},

year  = {2022},

date = {2022-06-01},

journal = {PRX Quantum},

volume = {3},

number = {2},

publisher = {American Physical Society (APS)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Cohen_2022,

title = {Low-overhead fault-tolerant quantum computing using long-range connectivity},

author = {Lawrence Z. Cohen and Isaac H. Kim and Stephen D. Bartlett and Benjamin J. Brown},

url = {http://dx.doi.org/10.1126/sciadv.abn1717},

doi = {10.1126/sciadv.abn1717},

issn = {2375-2548},

year  = {2022},

date = {2022-05-01},

journal = {Science Advances},

volume = {8},

number = {20},

publisher = {American Association for the Advancement of Science (AAAS)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Hillmann_2022,

title = {Performance of Teleportation-Based Error-Correction Circuits for Bosonic Codes with Noisy Measurements},

author = {Timo Hillmann and Fernando Quijandría and Arne L. Grimsmo and Giulia Ferrini},

url = {http://dx.doi.org/10.1103/PRXQuantum.3.020334},

doi = {10.1103/prxquantum.3.020334},

issn = {2691-3399},

year  = {2022},

date = {2022-05-01},

journal = {PRX Quantum},

volume = {3},

number = {2},

publisher = {American Physical Society (APS)},

keywords = {},

pubstate = {published},

tppubtype = {article}

}