Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session TT03: V: Advances in Qubit Readout and Control
3:30 PM–5:30 PM,
Tuesday, March 21, 2023
Room: Virtual Room 3
Sponsoring
Unit:
DQI
Chair: Xuexin Xu, Forschungszentrum Jülich GmbH
Abstract: TT03.00002 : Analysis of Elzerman readout based on Bayesian inference methods*
3:42 PM–3:54 PM
Presenter:
Julia Berndtsson
(Princeton University)
Authors:
Julia Berndtsson
(Princeton University)
Adam R Mills
(Princeton University)
Zhaoyi (Joy) Zheng
(Princeton University)
Jason R Petta
(Princeton University)
Methods based on spin-to-charge conversion are commonly used to initialize and measure Loss-DiVincenzo qubits [1]. In this scheme, we tune the spin-up and spin-down energy levels of the dot relative to the Fermi energy of an electron reservoir, and deduce the spin of the electron on the dot based on whether it tunnels off the dot into the Fermi sea [2]. The presence or absence of a tunneling event is detected using a charge detector. Traditionally, the presence of tunneling has been defined by a constant threshold [3]. More sophisticated methods could both improve the accuracy and speed of detection of these events. In this talk, we report on the implementation of an algorithm based on Bayesian inference for the analysis of Elzerman readout data, and characterize its performance as compared to previous methods.
*Research sponsored by ARO grant No. W911NF-15-1-0149 and the Gordon and Betty Moore Foundation's EPiQS Initiative through grant GBMF4535.
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