Recent Publications

Realization of a CQ3 Qubit: energy spectroscopy and coherence,” Benedikt Kratochwil, Jonne V. Koski, Andreas J. Landig, Pasquale Scarlino, José C. Abadillo-Uriel, Christian Reichl, Susan N. Coppersmith, Werner Wegscheider, Mark Friesen, Andreas Wallraff, Thomas Ihn, and Klaus Ensslin, arXiv:2006.05883. Preprint [arXiv]
Spatial Noise Correlations in a Si/SiGe Two-Qubit Device from Bell State Coherences,” Jelmer M. Boter, X. Xue, Tobias S. Krahenmann, T. F. Watson, Vickram N. Premakumar, D. R. Ward, D. E. Savage, M. G. Lagally, Mark Friesen, S. N. Coppersmith, M. A. Eriksson, Robert Joynt, and L. M. K. Vandersypen, Phys. Rev. B 101, 235133 (2020) [arXiv | Journal]
   V. N. Premakumar, M. Saffman, and R. Joynt, Measurement-free error correction with coherent ancillas  arXiv  (2020)
Progress Towards a Capacitively Mediated CNOT Between Two Charge Qubits in Si/SiGe,” E. R. MacQuarrie, Samuel F. Neyens, J. P. Dodson, J. Corrigan, Brandur Thorgrimsson, Nathan Holman, M. Palma, L. F. Edge, Mark Friesen, S. N. Coppersmith, and M. A. Eriksson, arXiv:2003.06768. Preprint [arXiv]
Microwave Engineering for Semiconductor Quantum Dots in a cQED Architecture,” Nathan Holman, J. P. Dodson, L. F. Edge, S. N. Coppersmith, M. Friesen, R. McDermott, and M. A. Eriksson, arXiv:2006.02514. Preprint [arXiv]
The effect of external electric fields on silicon with superconducting gallium nano-precipitates,” B. Thorgrimsson, T. McJunkin, E. R. MacQuarrie, S. N. Coppersmith, and M. A. Eriksson, J. Appl. Phys. 127, 215102 (2020) [arXiv | Journal]
Atomic clock system,” MS Larsen, and TG Walker, US Patent App. 16/712,614 (2020) [GScholar]
Effect of quantum Hall edge strips on valley splitting in silicon quantum wells,” Brian Paquelet Wuetz, Merritt P. Losert, Alberto Tosato, Mario Lodari, Peter L. Bavdaz, Lucas Stehouwer, Payam Amin, James S. Clarke, Susan N. Coppersmith, Amir Sammak, Menno Veldhorst, Mark Friesen, and Giordano Scappucci, arXiv:2006.02305. Preprint [arXiv]
Linear and Nonlinear Crystal Optics Using the Magnetic Field of Light,” Z. N. Buckholtz and D. D. Yavuz Phys. Rev. A 101, 02831 (2020)“ [PDF]
Repetitive quantum non-demolition measurement and soft decoding of a silicon spin qubit,” X. Xue, Benjamin D'Anjou, T. F. Watson, D. R. Ward, D. E. Savage, M. G. Lagally, Mark Friesen, S. N. Coppersmith, M. A. Eriksson, William A. Coish, and L. M. K. Vandersypen, Phys. Rev. X 10, 021006 (2020) [arXiv | Journal]
M. Saffman,” I. I. Beterov, A. Dalal, E. J. Paez, and B. C. Sanders, Symmetric Rydberg controlled-Z gates with adiabatic pulses Phys. Rev. A 101 062309 (2020)
Strong photon coupling to the quadrupole moment of an electron in a solid-state qubit,” J. V. Koski, A. J. Landig, M. Russ, J. C. Abadillo-Uriel, P. Scarlino, B. Kratochwil, C. Reichl, W. Wegscheider, Guido Burkard, Mark Friesen, S. N. Coppersmith, A. Wallraff, K. Ensslin, and T. Ihn, Nature Physics 16, 642 (2020) [Journal]
Auto-tuning of double dot devices in situ with machine learning,” Justyna P. Zwolak, T. McJunkin, Sandesh S. Kalantre, J. P. Dodson, E. R. MacQuarrie, D. E. Savage, M. G. Lagally, S. N. Coppersmith, M. A. Eriksson, and Jacob M. Taylor, Phys. Rev. Applied 13, 034075 (2020) [arXiv | Journal]
N. Lauk,” N. Sinclair, S. Barzanjeh, J. P. Covey, M. Saffman, M. Spiropulu, and C. Simon, Perspectives on quantum transduction, Qu. Sci. Tech. 5, 020501 (2020)
Lifting of spin blockade by charged impurities in Si-MOS double quantum dot devices,” Cameron King, Joshua S. Schoenfield, M. J. Calderón, Belita Koiller, André Saraiva, Xuedong Hu, HongWen Jiang, Mark Friesen, and S. N. Coppersmith, Phys. Rev. B 101, 155411 (2020) [Journal]
Majorana bound states in nanowire-superconductor hybrid systems in periodic magnetic fields,” Viktoriia Kornich, Maxim G. Vavilov, Mark Friesen, M. A. Eriksson, and S. N. Coppersmith, Phys. Rev. B 101, 125414 (2020) [Journal]
M. Kwon,” P. Yang, P. Huft, C. Young, M. Ebert, and M. Saffman, Generation of 14.0 W of single-frequency light at 770 nm by intracavity frequency doubling Opt. Lett.  45, 339 (2020)
High-fidelity entangling gates for quantum-dot hybrid qubits based on exchange interactions,” Yuan-Chi Yang, S. N. Coppersmith, and Mark Friesen, Phys. Rev. A 101, 012338 (2020) [Journal]
Measurements of Capacitive Coupling Within a Quadruple-Quantum-Dot Array,” Samuel F. Neyens, E.R. MacQuarrie, J.P. Dodson, J. Corrigan, Nathan Holman, Brandur Thorgrimsson, M. Palma, Thomas McJunkin, L.F. Edge, Mark Friesen, S.N. Coppersmith, and M.A. Eriksson, Phys. Rev. Appl. 12, 064049 (2019) [Journal]
Characterizing atomic magnetic gradiometers for fetal magnetocardiography,” IA Sulai, ZJ DeLand, MD Bulatowicz, CP Wahl, RT Wakai, and TG Walker, Review of Scientific Instruments 90 (8), 085003, 4 (2019) [GScholar]
T. M. Graham,” M. Kwon, B. Grinkemeyer, Z. Marra, X. Jiang, M. T. Lichtman, Y. Sun, M. Ebert, and M. Saffman, Rydberg-Mediated Entanglement in a Two-Dimensional Neutral Atom Qubit Array Phys. Rev. Lett. 123, 230501 (2019)
Anomalous Charge Noise in Superconducting Qubits,” B. G. Christensen, C. D. Wilen, A. Opremcak, J. Nelson, F. Schlenker, C. H. Zimonick, L. Faoro, L. B. Ioffe, Y. J. Rosen, J. L. DuBois, B. L. T. Plourde, R. McDermott, arXiv:1902.02911 (2019) [arXiv | PDF]
High-fidelity single-qubit gates in a strongly driven quantum-dot hybrid qubit with 1/f charge noise,” Yuan-Chi Yang, S. N. Coppersmith, and Mark Friesen, Phys. Rev. A 100, 022337 (2019) [Journal]
Enhancing the dipolar coupling of a S-T0 qubit with a transverse sweet spot,” J. C. Abadillo-Uriel, M. A. Eriksson, S. N. Coppersmith, and Mark Friesen, Nature Comm. 10, 5641 (2019) [arXiv | Journal]
An all-optical atomic magnetometer-gradiometer for use in Earth's field,” R Wyllie, A Perry, T Walker, B Buckley, G Morrison, and M Bulatowicz, APS 2019, S01. 037 (2019) [GScholar]
Microwave to optical conversion with atoms on a superconducting chip,” D. Petrosyan, K. Mølmer, J. Fortagh,and M. Saffman, New J. Phys. 21, 073033 (2019) [PDF]
Scalable Hardware-Efficient Qubit Control with Single Flux Quantum Pulse Sequences,” Kangbo Li, R. McDermott, and Maxim G. Vavilov, arXiv:1902.02911 (2019) [arXiv | PDF]
Quantum computing with semiconductor spins,” L. M. K. Vandersypen and M. A. Eriksson, Physics Today 72, 38 (2019) [Journal]
Preparation and control of neutral atom ensemble qubits using Rydberg interactions,” C Young, M Kwon, P Yang, P Huft, B Radzom, M Ebert, and T Walker, APS 2019, E01. 097 (2019) [GScholar]
Virtual-photon-mediated spin-qubit–transmon coupling,” A. J. Landig, J. V. Koski, P. Scarlino, C. Müller, J. C. Abadillo-Uriel, B. Kratochwil, C. Reichl, W. Wegscheider, S. N. Coppersmith, Mark Friesen, A. Wallraff, T. Ihn, and K. Ensslin, Nature Commun. 10, 5037 (2019) [Journal]
No-go bounds for quantum seals,” S. Kimmel and S. Kolkowitz, accepted for publication at Physical Review A, pre-print available at arXiv:1802.10007 (2019) [arXiv]
Benchmarking Gate Fidelities in a Si/SiGe Two-Qubit Device,” X. Xue, T. F. Watson, J. Helsen, D. R. Ward, D. E. Savage, M. G. Lagally, S. N. Coppersmith, M. A. Eriksson, S. Wehner, and L. M. K. Vandersypen, Phys. Rev. X 9, 021011 (2019) [arXiv | Journal]
Microwave-to-optical conversion via four-wave mixing in a cold ytterbium ensemble,” J. P. Covey, A. Sipahigil, and M. Saffman,  P hys. Rev. A 100, 012307 (2019) [PDF]
Digital coherent control of a superconducting qubit,” Edward Leonard Jr., Matthew A. Beck, JJ Nelson, Brad G. Christensen, Ted Thorbeck, Caleb Howington, Alexander Opremcak, Ivan V. Pechenezhskiy, Kenneth Dodge, Nicholas P. Dupuis, Jaseung Ku, Francisco Schlenker, Joseph Suttle, Christopher Wilen, Shaojiang Zhu, Maxim G. Vavilov, Britton L. T. Plourde, Robert McDermott, Phys. Rev. Applied 11, 014009 (2019) [arXiv | Journal | PDF]
Adiabatic two-qubit gates in capacitively coupled quantum dot hybrid qubits,” Adam Frees, Sebastian Mehl, John King Gamble, Mark Friesen, and S. N. Coppersmith, npj Quantum Inform. 5, 73 (2019) [Journal]
Synchronous Spin-Exchange Optically Pumped NMR Gyro,” D Thrasher, S Sorensen, M Bulatowicz, and T Walker, APS 2019, S01. 042 (2019) [GScholar]
Measurements of the Thermal Resistivity of InAlAs, InGaAs, and InAlAs/InGaAs Superlattices,” G. R. Jaffe, S. Mei, C. Boyle, J. D. Kirch, D. E. Savage, D. Botez, L. J. Mawst, I. Knezevic, M. G. Lagally, and M. A. Eriksson, ACS Appl. Mat. Int. 11, 11970 (2019) [Journal]
Achieving high-fidelity single-qubit gates in a strongly driven charge qubit with 1/f charge noise,” Yuan-Chi Yang, S. N. Coppersmith, and Mark Friesen, npj Quantum Inform. 5, 12 (2019) [Journal]
Quantum computing with neutral atoms,” M. Saffman, Nat. Sci. Rev.6, 24 (2019) [PDF]
Measurement of a Superconducting Qubit with a Microwave Photon Counter,” A. Opremcak, I. V. Pechenezhskiy, C. Howington, B. G. Christensen, M. A. Beck, E. Leonard Jr., J. Suttle, C. Wilen, K. Nesterov, G. J. Ribeill, T. Thorbeck,1, F. Schlenker, M. G. Vavilov, B. L. T. Plourde, and R. McDermott, Science 361, 6408 (2019) [arXiv | Journal | PDF]
Dual-Axis -Pulse Magnetometer with Suppressed Spin-Exchange Relaxation,” E Zhivun, M Bulatowicz, A Hryciuk, and T Walker, Physical review applied 11 (3), 034040, 1 (2019) [GScholar]
Compressed Optimization of Device Architectures for Semiconductor Quantum Devices,” Adam Frees, John King Gamble, D. R. Ward, R. Blume-Kohout, M. A. Eriksson, Mark Friesen, and S. N. Coppersmith, Phys. Rev. Applied 11, 024063 (2019) [arXiv | Journal]
Pulsed-beam atomic magnetometer system,” MD Bulatowicz, TG Walker, and MS Larsen, US Patent App. 16/053,535 (2018) [GScholar]
A programmable two-qubit quantum processor in silicon,” T. F. Watson, S. G. J. Philips, E. Kawakami, D. R. Ward, P. Scarlino, M. Veldhorst, D. E. Savage, M. G. Lagally, Mark Friesen, S. N. Coppersmith, M. A. Eriksson, and L. M. K. Vandersypen, Nature 555, 633–637 (2018) [Journal]
Signatures of atomic-scale structure in the energy dispersion and coherence of a Si quantum-dot qubit,” J. C. Abadillo-Uriel, B. Thorgrimsson, Dohun Kim, L. W. Smith, C. B. Simmons, D. R. Ward, R. H. Foote, J. Corrigan, D. E. Savage, M. G. Lagally, M. J. Calderon, S. N. Coppersmith, M. A. Eriksson, and Mark Friesen, Phys. Rev. B 98, 165438 (2018) [arXiv | Journal]
The critical role of substrate disorder for valley splitting in Si quantum wells,” Samuel F. Neyens, Ryan H. Foote, Brandur Thorgrimsson, T. J. Knapp, Thomas McJunkin, L. M. K. Vandersypen, Payam Amin, Nicole K. Thomas, James S. Clarke, D. E. Savage, M. G. Lagally, Mark Friesen, S. N. Coppersmith, and M. A. Eriksson, preprint arXiv:1804.01914, Applied Physics Letters 12, 243107 (2018) [arXiv | PDF]
Fast three-qubit Toffoli quantum gate based on three-body Förster resonances in Rydberg atoms,” 132 I. I. Beterov, I. N. Ashkarin, E. A. Yakshina, D. B. Tretyakov, V. M. Entin, I. I. Ryabtsev, P. Cheinet, P. Pillet, and M. Saffman, Phys. Rev. A 98, 042704 (2018) [PDF]
Valley dependent anisotropic spin splitting in silicon quantum dots,” Rifat Ferdous, Erika Kawakami, Pasquale Scarlino, Michal P. Nowak, D. R. Ward, D. E. Savage, M. G. Lagally, S. N. Coppersmith, Mark Friesen, Mark A. Eriksson, L. M. K. Vandersypen, and Rajib Rahman, npj Quantum Inform. 4, 26 (2018) [Journal]