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Type of Publication: | Journal article |
Publication status: | Published |
Author: | D'Anjou, Benjamin; Coish, William A. |
Year of publication: | 2017 |
Published in: | Physical Review A ; 96 (2017), 5. - 052321. - ISSN 2469-9926. - eISSN 2469-9934 |
ArXiv-ID: | arXiv:1708.04991v3 |
DOI (citable link): | https://dx.doi.org/10.1103/PhysRevA.96.052321 |
Summary: |
Single-shot qubit readout typically combines high readout contrast with long-lived readout signals, leading to large signal-to-noise ratios and high readout fidelities. In recent years, it has been demonstrated that both readout contrast and readout signal lifetime, and thus the signal-to-noise ratio, can be enhanced by forcing the qubit state to transition through intermediate states. In this work, we demonstrate that the sub-Poissonian relaxation statistics introduced by intermediate states can reduce the single-shot readout error rate by orders of magnitude even when there is no increase in signal-to-noise ratio. These results hold for moderate values of the signal-to-noise ratio (S≲100) and a small number of intermediate states (N≲10). The ideas presented here could have important implications for readout schemes relying on the detection of transient charge states, such as spin-to-charge conversion schemes for semiconductor spin qubits and parity-to-charge conversion schemes for topologically protected Majorana qubits.
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Subject (DDC): | 530 Physics |
Comment on publication: | 10 pages, 6 figures. Two appendices have been added. This version is close to the final published version |
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D'ANJOU, Benjamin, William A. COISH, 2017. Enhancing qubit readout through dissipative sub-Poissonian dynamics. In: Physical Review A. 96(5), 052321. ISSN 2469-9926. eISSN 2469-9934. Available under: doi: 10.1103/PhysRevA.96.052321
@article{DAnjou2017Enhan-40787, title={Enhancing qubit readout through dissipative sub-Poissonian dynamics}, year={2017}, doi={10.1103/PhysRevA.96.052321}, number={5}, volume={96}, issn={2469-9926}, journal={Physical Review A}, author={D'Anjou, Benjamin and Coish, William A.}, note={10 pages, 6 figures. Two appendices have been added. This version is close to the final published version Article Number: 052321} }
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