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  • 1701.06971

    Rights statement: ©2017 American Physical Society

    Accepted author manuscript, 755 KB, PDF document

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Effects of charge noise on a pulse-gated singlet-triplet S−T− qubit

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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Effects of charge noise on a pulse-gated singlet-triplet S−T− qubit. / Qi, Zhenyi; Wu, X.; Ward, D. R. et al.
In: Physical review B, Vol. 96, No. 11, 115305, 15.09.2017.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

Qi, Z, Wu, X, Ward, DR, Prance, JR, Kim, D, Gamble, JK, Mohr, RT, Shi, Z, Savage, DE, Lagally, MG, Eriksson, MA, Friesen, M, Coppersmith, SN & Vavilov, MG 2017, 'Effects of charge noise on a pulse-gated singlet-triplet S−T− qubit', Physical review B, vol. 96, no. 11, 115305. https://doi.org/10.1103/PhysRevB.96.115305

APA

Qi, Z., Wu, X., Ward, D. R., Prance, J. R., Kim, D., Gamble, J. K., Mohr, R. T., Shi, Z., Savage, D. E., Lagally, M. G., Eriksson, M. A., Friesen, M., Coppersmith, S. N., & Vavilov, M. G. (2017). Effects of charge noise on a pulse-gated singlet-triplet S−T− qubit. Physical review B, 96(11), Article 115305. https://doi.org/10.1103/PhysRevB.96.115305

Vancouver

Qi Z, Wu X, Ward DR, Prance JR, Kim D, Gamble JK et al. Effects of charge noise on a pulse-gated singlet-triplet S−T− qubit. Physical review B. 2017 Sept 15;96(11):115305. Epub 2017 Sept 11. doi: 10.1103/PhysRevB.96.115305

Author

Qi, Zhenyi ; Wu, X. ; Ward, D. R. et al. / Effects of charge noise on a pulse-gated singlet-triplet S−T− qubit. In: Physical review B. 2017 ; Vol. 96, No. 11.

Bibtex

@article{e3981bace5d3480aa0e633b9589b415c,
title = "Effects of charge noise on a pulse-gated singlet-triplet S−T− qubit",
abstract = "We study the dynamics of a pulse-gated semiconductor double-quantum-dot qubit. In our experiments, the qubit coherence times are relatively long, but the visibility of the quantum oscillations is low. We show that these observations are consistent with a theory that incorporates decoherence arising from charge noise that gives rise to detuning fluctuations of the double dot. Because effects from charge noise are largest near the singlet-triplet avoided level crossing, the visibility of the oscillations is low when the singlet-triplet avoided level crossing occurs in the vicinity of the charge degeneracy point crossed during the manipulation, but there is only modest dephasing at the large detuning value at which the quantum phase accumulates. This theory agrees well with experimental data and predicts that the visibility can be increased greatly by appropriate tuning of the interdot tunneling rate.",
author = "Zhenyi Qi and X. Wu and Ward, {D. R.} and Prance, {Jonathan Robert} and Dohun Kim and Gamble, {John King} and Mohr, {R. T.} and Zhan Shi and Savage, {D. E.} and Lagally, {M. G.} and Eriksson, {M. A.} and Mark Friesen and Coppersmith, {S. N.} and Vavilov, {M. G.}",
note = "{\textcopyright}2017 American Physical Society",
year = "2017",
month = sep,
day = "15",
doi = "10.1103/PhysRevB.96.115305",
language = "English",
volume = "96",
journal = "Physical review B",
issn = "2469-9950",
publisher = "AMER PHYSICAL SOC",
number = "11",

}

RIS

TY - JOUR

T1 - Effects of charge noise on a pulse-gated singlet-triplet S−T− qubit

AU - Qi, Zhenyi

AU - Wu, X.

AU - Ward, D. R.

AU - Prance, Jonathan Robert

AU - Kim, Dohun

AU - Gamble, John King

AU - Mohr, R. T.

AU - Shi, Zhan

AU - Savage, D. E.

AU - Lagally, M. G.

AU - Eriksson, M. A.

AU - Friesen, Mark

AU - Coppersmith, S. N.

AU - Vavilov, M. G.

N1 - ©2017 American Physical Society

PY - 2017/9/15

Y1 - 2017/9/15

N2 - We study the dynamics of a pulse-gated semiconductor double-quantum-dot qubit. In our experiments, the qubit coherence times are relatively long, but the visibility of the quantum oscillations is low. We show that these observations are consistent with a theory that incorporates decoherence arising from charge noise that gives rise to detuning fluctuations of the double dot. Because effects from charge noise are largest near the singlet-triplet avoided level crossing, the visibility of the oscillations is low when the singlet-triplet avoided level crossing occurs in the vicinity of the charge degeneracy point crossed during the manipulation, but there is only modest dephasing at the large detuning value at which the quantum phase accumulates. This theory agrees well with experimental data and predicts that the visibility can be increased greatly by appropriate tuning of the interdot tunneling rate.

AB - We study the dynamics of a pulse-gated semiconductor double-quantum-dot qubit. In our experiments, the qubit coherence times are relatively long, but the visibility of the quantum oscillations is low. We show that these observations are consistent with a theory that incorporates decoherence arising from charge noise that gives rise to detuning fluctuations of the double dot. Because effects from charge noise are largest near the singlet-triplet avoided level crossing, the visibility of the oscillations is low when the singlet-triplet avoided level crossing occurs in the vicinity of the charge degeneracy point crossed during the manipulation, but there is only modest dephasing at the large detuning value at which the quantum phase accumulates. This theory agrees well with experimental data and predicts that the visibility can be increased greatly by appropriate tuning of the interdot tunneling rate.

U2 - 10.1103/PhysRevB.96.115305

DO - 10.1103/PhysRevB.96.115305

M3 - Journal article

VL - 96

JO - Physical review B

JF - Physical review B

SN - 2469-9950

IS - 11

M1 - 115305

ER -