A silicon singlet–triplet qubit driven by spin-valley coupling

Jock, Ryan M.; Jacobson, N. Tobias; Rudolph, Martin; Ward, Daniel R.; Carroll, Malcolm S.; Luhman, Dwight R.

doi:10.1038/s41467-022-28302-y

Title: A silicon singlet–triplet qubit driven by spin-valley coupling

Journal Article · Wed Feb 02 00:00:00 EST 2022 · Nature Communications

DOI:https://doi.org/10.1038/s41467-022-28302-y· OSTI ID:1882873

^[1]; Jacobson, N. Tobias ^[1]; Rudolph, Martin ^[1];

^[2]; Carroll, Malcolm S. ^[3]; Luhman, Dwight R. ^[1]

Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); HRL Laboratories, LLC, Malibu, CA (United States)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); IBM Quantum, Yorktown Heights, NY (United States)

Spin–orbit effects, inherent to electrons confined in quantum dots at a silicon heterointerface, provide a means to control electron spin qubits without the added complexity of on-chip, nanofabricated micromagnets or nearby coplanar striplines. Here, we demonstrate a singlet–triplet qubit operating mode that can drive qubit evolution at frequencies in excess of 200 MHz. This approach offers a means to electrically turn on and off fast control, while providing high logic gate orthogonality and long qubit dephasing times. We utilize this operational mode for dynamical decoupling experiments to probe the charge noise power spectrum in a silicon metal-oxide-semiconductor double quantum dot. In addition, we assess qubit frequency drift over longer timescales to capture low-frequency noise. We present the charge noise power spectral density up to 3 MHz, which exhibits a 1/f^α dependence consistent with α ~ 0.7, over 9 orders of magnitude in noise frequency.

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

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

Grant/Contract Number:: NA0003525

OSTI ID:: 1882873

Report Number(s):: SAND2022-0452J; 702863

Journal Information:: Nature Communications, Vol. 13, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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