TY - JOUR
T1 - Towards a realistic GaAs-spin qubit device for a classical error-corrected quantum memory
AU - Rispler, Manuel
AU - Cerfontaine, Pascal
AU - Langrock, Veit
AU - Terhal, Barbara M.
PY - 2020
Y1 - 2020
N2 - Based on numerically optimized real-device gates and parameters we study the performance of the phase-flip (repetition) code on a linear array of gallium arsenide (GaAs) quantum dots hosting singlet-triplet qubits. We first examine the expected performance of the code using simple error models of circuit-level and phenomenological noise, reporting, for example, a circuit-level depolarizing noise threshold of approximately 3%. We then perform density-matrix simulations using a maximum-likelihood and minimum-weight matching decoder to study the effect of real-device dephasing, readout error, and quasistatic as well as fast gate noise. Considering the tradeoff between qubit readout error and dephasing time (T2) over measurement time, we identify a subthreshold region for the phase-flip code which lies within experimental reach.
AB - Based on numerically optimized real-device gates and parameters we study the performance of the phase-flip (repetition) code on a linear array of gallium arsenide (GaAs) quantum dots hosting singlet-triplet qubits. We first examine the expected performance of the code using simple error models of circuit-level and phenomenological noise, reporting, for example, a circuit-level depolarizing noise threshold of approximately 3%. We then perform density-matrix simulations using a maximum-likelihood and minimum-weight matching decoder to study the effect of real-device dephasing, readout error, and quasistatic as well as fast gate noise. Considering the tradeoff between qubit readout error and dephasing time (T2) over measurement time, we identify a subthreshold region for the phase-flip code which lies within experimental reach.
UR - http://www.scopus.com/inward/record.url?scp=85089504974&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.102.022416
DO - 10.1103/PhysRevA.102.022416
M3 - Article
AN - SCOPUS:85089504974
VL - 102
JO - Physical Review A: covering atomic, molecular, and optical physics and quantum information
JF - Physical Review A: covering atomic, molecular, and optical physics and quantum information
SN - 2469-9926
IS - 2
M1 - 022416
ER -