Two-axis control of a singlet-triplet qubit with an integrated micromagnet

Wu, X.; Ward, D. R.; Prance, J. R.; Kim, Dohun; Gamble, John King; Mohr, R. T.; Shi, Zhan; Savage, D. E.; Lagally, M. G.; Friesen, Mark; Coppersmith, S. N.; Eriksson, M. A.

doi:10.1073/pnas.1412230111

Two-axis control of a singlet-triplet qubit with an integrated micromagnet

Journal Article · Mon Aug 04 00:00:00 EDT 2014 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1412230111· OSTI ID:1344470

Wu, X. ^[1]; Ward, D. R. ^[1]; Prance, J. R. ^[2]; Kim, Dohun ^[1]; Gamble, John King ^[1]; Mohr, R. T. ^[1]; Shi, Zhan ^[1]; Savage, D. E. ^[1]; Lagally, M. G. ^[1]; Friesen, Mark ^[1]; Coppersmith, S. N. ^[1]; Eriksson, M. A. ^[1]

Univ. of Wisconsin, Madison, WI (United States)
Lancaster Univ., Lancaster (United Kingdom)

The qubit is the fundamental building block of a quantum computer. We fabricate a qubit in a silicon double-quantum dot with an integrated micromagnet in which the qubit basis states are the singlet state and the spin-zero triplet state of two electrons. Because of the micromagnet, the magnetic field difference ΔB between the two sides of the double dot is large enough to enable the achievement of coherent rotation of the qubit’s Bloch vector around two different axes of the Bloch sphere. By measuring the decay of the quantum oscillations, the inhomogeneous spin coherence time T^*₂ is determined. Lastly, by measuring T^*₂ at many different values of the exchange coupling J and at two different values of ΔB, we provide evidence that the micromagnet does not limit decoherence, with the dominant limits on T^*₂ arising from charge noise and from coupling to nuclear spins.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000

OSTI ID:: 1344470

Report Number(s):: SAND--2015-5833J; 618482

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Issue: 33 Vol. 111; ISSN 0027-8424

Publisher:: National Academy of Sciences, Washington, DC (United States)Copyright Statement

Country of Publication:: United States

Language:: English

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Negative exchange interactions in coupled few-electron quantum dots Deng, Kuangyin; Calderon-Vargas, F. A.; Mayhall, Nicholas J. Physical Review B, Vol. 97, Issue 24 https://doi.org/10.1103/physrevb.97.245301	journal	June 2018
Readout of singlet-triplet qubits at large magnetic field gradients Orona, Lucas A.; Nichol, John M.; Harvey, Shannon P. Physical Review B, Vol. 98, Issue 12 https://doi.org/10.1103/physrevb.98.125404	journal	September 2018
Pulse sequence designed for robust C -phase gates in SiMOS and Si/SiGe double quantum dots Güngördü, Utkan; Kestner, J. P. Physical Review B, Vol. 98, Issue 16 https://doi.org/10.1103/physrevb.98.165301	journal	October 2018
High-Fidelity Single-Shot Readout for a Spin Qubit via an Enhanced Latching Mechanism Harvey-Collard, Patrick; D’Anjou, Benjamin; Rudolph, Martin Physical Review X, Vol. 8, Issue 2 https://doi.org/10.1103/physrevx.8.021046	journal	May 2018
A fault-tolerant addressable spin qubit in a natural silicon quantum dot Takeda, Kenta; Kamioka, Jun; Otsuka, Tomohiro Science Advances, Vol. 2, Issue 8 https://doi.org/10.1126/sciadv.1600694	journal	August 2016
Noise-induced collective quantum state preservation in spin qubit arrays Barnes, Edwin; Deng, Dong-Ling; Throckmorton, Robert E. arXiv https://doi.org/10.48550/arxiv.1510.03862	text	January 2015
Do micromagnets expose spin qubits to charge and Johnson noise? Kha, Allen; Joynt, Robert; Culcer, Dimitrie arXiv https://doi.org/10.48550/arxiv.1511.05247	text	January 2015
Coherent coupling between a quantum dot and a donor in silicon Harvey-Collard, Patrick; Jacobson, N. Tobias; Rudolph, Martin arXiv https://doi.org/10.48550/arxiv.1512.01606	text	January 2015
Quantum and Tunnelling Capacitance in Charge and Spin Qubits Mizuta, R.; Otxoa, R. M.; Betz, A. C. arXiv https://doi.org/10.48550/arxiv.1604.02884	text	January 2016
A CMOS silicon spin qubit Maurand, R.; Jehl, X.; Patil, D. Kotekar arXiv https://doi.org/10.48550/arxiv.1605.07599	text	January 2016
High-fidelity entangling gate for double-quantum-dot spin qubits Nichol, John M.; Orona, Lucas A.; Harvey, Shannon P. arXiv https://doi.org/10.48550/arxiv.1608.04258	preprint	January 2016
Spin blockade and coherent dynamics of high-spin states in a three-electron double quantum dot Chen, Bao-Bao; Wang, Bao-Chuan; Cao, Gang arXiv https://doi.org/10.48550/arxiv.1610.04940	text	January 2016
Pulse sequences for suppressing leakage in single-qubit gate operations Ghosh, Joydip; Coppersmith, S. N.; Friesen, Mark arXiv https://doi.org/10.48550/arxiv.1612.00568	text	January 2016
Waiting time distribution revealing the internal spin dynamics in a double quantum dot Ptaszynski, Krzysztof arXiv https://doi.org/10.48550/arxiv.1707.00441	text	January 2017
Large tunable valley splitting in edge-free graphene quantum dots on boron nitride Freitag, Nils M.; Reisch, Tobias; Chizhova, Larisa A. arXiv https://doi.org/10.48550/arxiv.1708.09170	text	January 2017
Pulse sequence designed for robust C-phase gates in SiMOS and Si/SiGe double quantum dots Güngördü, Utkan; Kestner, J. P. arXiv https://doi.org/10.48550/arxiv.1806.01262	text	January 2018
Achieving High-Fidelity Single-Qubit Gates in a Strongly Driven Charge Qubit with $1\!/\!f$ Charge Noise Yang, Yuan-Chi; Coppersmith, S. N.; Friesen, Mark arXiv https://doi.org/10.48550/arxiv.1806.02413	text	January 2018
Coherence time analysis in semiconducting hybrid qubit under realistic experimental conditions Ferraro, E.; Fanciulli, M.; De Michielis, M. arXiv https://doi.org/10.48550/arxiv.1806.05448	text	January 2018
Gate fidelity comparison in semiconducting spin qubit implementations affected by control noises Ferraro, E.; Fanciulli, M.; De Michielis, M. arXiv https://doi.org/10.48550/arxiv.1806.07597	text	January 2018
Low-frequency charge noise in Si/SiGe quantum dots Connors, Elliot J.; Nelson, Jj; Qiao, Haifeng arXiv https://doi.org/10.48550/arxiv.1907.07549	text	January 2019
High-Fidelity Entangling Gates for Quantum-Dot Hybrid Qubits Based on Exchange Interactions Yang, Yuan-Chi; Coppersmith, S. N.; Friesen, Mark arXiv https://doi.org/10.48550/arxiv.1910.03427	text	January 2019

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