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

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

doi:10.1103/PhysRevB.96.115305

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

Journal Article · Mon Sep 11 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.115305· OSTI ID:1378096

Qi, Zhenyi ^[1]; Wu, X. ^[2]; Ward, D. R. ^[3]; Prance, J. R. ^[2]; Kim, Dohun ^[2]; Gamble, John King ^[3]; Mohr, R. T. ^[2]; Shi, Zhan ^[2]; Savage, D. E. ^[2]; Lagally, M. G. ^[2]; Eriksson, M. A. ^[2]; Friesen, Mark ^[2]; Coppersmith, S. N. ^[2]; Vavilov, M. G. ^[2]

Univ. of Wisconsin, Madison, WI (United States). Wisconsin Inst. for Quantum Information; Wisconsin Institute for Quantum Information, University of Wisconsin-Madison
Univ. of Wisconsin, Madison, WI (United States). Wisconsin Inst. for Quantum Information
Univ. of Wisconsin, Madison, WI (United States). Wisconsin Inst. for Quantum Information; Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Computing Research

Here, 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 also 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 also agrees with experimental data and predicts that the visibility can be increased greatly by appropriate tuning of the interdot tunneling rate.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States); Univ. of Wisconsin, Madison, WI (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Army Research Office (ARO); US Department of the Navy, Office of Naval Research (ONR); US Dept. of Defense; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; FG02-03ER46028

OSTI ID:: 1378096

Alternate ID(s):: OSTI ID: 1467460
OSTI ID: 1389128

Report Number(s):: SAND--2017-0165J; SAND2017--0165J

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 11 Vol. 96; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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