High-Fidelity Single-Shot Readout for a Spin Qubit via an Enhanced Latching Mechanism
| العنوان: | High-Fidelity Single-Shot Readout for a Spin Qubit via an Enhanced Latching Mechanism |
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| المؤلفون: | William A. Coish, Benjamin D'Anjou, N. Tobias Jacobson, Malcolm S. Carroll, Joel R. Wendt, Patrick Harvey-Collard, Michael Lilly, Martin Rudolph, Tammy Pluym, Gregory A. Ten Eyck, Jason Dominguez, Michel Pioro-Ladrière |
| المصدر: | Harvey-Collard, P, D'Anjou, B, Rudolph, M, Jacobson, N T, Dominguez, J, Ten Eyck, G A, Wendt, J R, Pluym, T, Lilly, M P, Coish, W A, Pioro-Ladriere, M & Carroll, M S 2018, ' High-Fidelity Single-Shot Readout for a Spin Qubit via an Enhanced Latching Mechanism ', Physical Review X, vol. 8, no. 2, 021046 . https://doi.org/10.1103/PhysRevX.8.021046 Physical Review X, Vol 8, Iss 2, p 021046 (2018) |
| بيانات النشر: | American Physical Society (APS), 2018. |
| سنة النشر: | 2018 |
| مصطلحات موضوعية: | Physics::Instrumentation and Detectors, QC1-999, FOS: Physical sciences, General Physics and Astronomy, Word error rate, 02 engineering and technology, 01 natural sciences, High fidelity, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Quantum information, 010306 general physics, Spin-½, Quantum computer, Physics, Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics, business.industry, Reading (computer), Relaxation (NMR), 021001 nanoscience & nanotechnology, Qubit, Optoelectronics, Quantum Physics (quant-ph), 0210 nano-technology, business |
| الوصف: | The readout of semiconductor spin qubits based on spin blockade is fast but suffers from a small charge signal. Previous work suggested large benefits from additional charge mapping processes, however uncertainties remain about the underlying mechanisms and achievable fidelity. In this work, we study the single-shot fidelity and limiting mechanisms for two variations of an enhanced latching readout. We achieve average single-shot readout fidelities > 99.3% and > 99.86% for the conventional and enhanced readout respectively, the latter being the highest to date for spin blockade. The signal amplitude is enhanced to a full one-electron signal while preserving the readout speed. Furthermore, layout constraints are relaxed because the charge sensor signal is no longer dependent on being aligned with the conventional (2, 0) - (1, 1) charge dipole. Silicon donor-quantum-dot qubits are used for this study, for which the dipole insensitivity substantially relaxes donor placement requirements. One of the readout variations also benefits from a parametric lifetime enhancement by replacing the spin-relaxation process with a charge-metastable one. This provides opportunities to further increase the fidelity. The relaxation mechanisms in the different regimes are investigated. This work demonstrates a readout that is fast, has one-electron signal and results in higher fidelity. It further predicts that going beyond 99.9% fidelity in a few microseconds of measurement time is within reach. Supplementary information is included with the paper |
| وصف الملف: | application/pdf |
| تدمد: | 2160-3308 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f0c83adca7874c82f4ef767146df55a6 https://doi.org/10.1103/physrevx.8.021046 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....f0c83adca7874c82f4ef767146df55a6 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 21603308 |
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