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

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dc.contributor.authorKim, Jehyun-
dc.contributor.authorYun, Jonginn-
dc.contributor.authorJang, Wonjin-
dc.contributor.authorJang, Hyeongyu-
dc.contributor.authorPark, Jaemin-
dc.contributor.authorSong, Younguk-
dc.contributor.authorCho, Min-Kyun-
dc.contributor.authorSim, Sangwoo-
dc.contributor.authorSohn, Hanseo-
dc.contributor.authorJung, Hwanchul-
dc.contributor.authorUmansky, Vladimir-
dc.contributor.authorKim, Dohun-
dc.date.accessioned2024-05-27T08:23:09Z-
dc.date.available2024-05-27T08:23:09Z-
dc.date.created2022-08-19-
dc.date.created2022-08-19-
dc.date.created2022-08-19-
dc.date.issued2022-07-
dc.identifier.citationPhysical Review Letters, Vol.129 No.4, p. 040501-
dc.identifier.issn0031-9007-
dc.identifier.urihttps://hdl.handle.net/10371/203641-
dc.description.abstractWe 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.-
dc.language영어-
dc.publisherAmerican Physical Society-
dc.titleApproaching Ideal Visibility in Singlet-Triplet Qubit Operations Using Energy-Selective Tunneling-Based Hamiltonian Estimation-
dc.typeArticle-
dc.identifier.doi10.1103/PhysRevLett.129.040501-
dc.citation.journaltitlePhysical Review Letters-
dc.identifier.wosid000840947600005-
dc.identifier.scopusid2-s2.0-85135550197-
dc.citation.number4-
dc.citation.startpage040501-
dc.citation.volume129-
dc.description.isOpenAccessY-
dc.contributor.affiliatedAuthorKim, Jehyun-
dc.type.docTypeArticle-
dc.description.journalClass1-
dc.subject.keywordPlusELECTRON-SPIN-
dc.subject.keywordPlusQUANTUM-
dc.subject.keywordPlusFIDELITY-
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