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Approaching Ideal Visibility in Singlet-Triplet Qubit Operations Using Energy-Selective Tunneling-Based Hamiltonian Estimation

Cited 4 time in Web of Science Cited 4 time in Scopus
Authors

Kim, Jehyun; Yun, Jonginn; Jang, Wonjin; Jang, Hyeongyu; Park, Jaemin; Song, Younguk; Cho, Min-Kyun; Sim, Sangwoo; Sohn, Hanseo; Jung, Hwanchul; Umansky, Vladimir; Kim, Dohun

Issue Date
2022-07
Publisher
American Physical Society
Citation
Physical Review Letters, Vol.129 No.4, p. 040501
Abstract
We report energy-selective tunneling readout-based Hamiltonian parameter estimation of a two-electron spin qubit in a GaAs quantum dot array. Optimization of readout fidelity enables a single-shot measurement time of 16 μs on average, with adaptive initialization and efficient qubit frequency estimation based on real-time Bayesian inference. For qubit operation in a frequency heralded mode, we observe a 40-fold increase in coherence time without resorting to dynamic nuclear polarization. We also demonstrate active frequency feedback with quantum oscillation visibility, single-shot measurement fidelity, and gate fidelity of 97.7%, 99%, and 99.6%, respectively, showcasing the improvements in the overall capabilities of GaAs-based spin qubits. By pushing the sensitivity of the energy-selective tunneling-based spin to charge conversion to the limit, the technique is useful for advanced quantum control protocols such as error mitigation schemes, where fast qubit parameter calibration with a large signal-to-noise ratio is crucial.
ISSN
0031-9007
URI
https://hdl.handle.net/10371/203641
DOI
https://doi.org/10.1103/PhysRevLett.129.040501
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