Pulse sequence designed for robust C-phase gates in SiMOS and Si/SiGe double quantum dots

Utkan Güngördü and J. P. Kestner
Phys. Rev. B 98, 165301 – Published 1 October 2018

Abstract

We theoretically analyze the errors in one- and two-qubit gates in SiMOS and Si/SiGe spin qubit experiments and present a pulse sequence which can suppress the errors in exchange coupling due to charge noise using ideal local rotations. In practice, the overall fidelity of the pulse sequence will be limited only by the quality of the single-qubit gates available: The C-phase infidelity comes out to be 2.5× the infidelity of the single-qubit operations. Based on experimental data, we model the errors and show that C-phase gate infidelities can be suppressed by two orders in magnitude. Our pulse sequence is simple and we expect an experimental implementation would be relatively straightforward. We also evaluate the performance of this gate against 1/f noise. Assuming a soft ultraviolet cutoff, we show that the pulse sequence designed for quasistatic noise still performs well when the cutoff occurs below 1 MHz with experimentally achievable one-qubit Rabi frequencies, suppressing the infidelity by an order of magnitude compared to the existing direct adiabatic protocol. We also analyze the effects of nonadiabaticity during finite rise periods and find that adiabaticity is not a limitation for the current values of exchange coupling.

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  • Received 11 June 2018

DOI:https://doi.org/10.1103/PhysRevB.98.165301

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsQuantum Information, Science & Technology

Authors & Affiliations

Utkan Güngördü* and J. P. Kestner

  • Department of Physics, University of Maryland Baltimore County, Baltimore, Maryland 21250, USA

  • *utkan@umbc.edu

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Issue

Vol. 98, Iss. 16 — 15 October 2018

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