Fast high-fidelity single-shot readout of spins in silicon using a single-electron box
| Autor: | Oakes, G. A., Ciriano-Tejel, V. N., Wise, D., Fogarty, M. A., Lundberg, T., Lainé, C., Schaal, S., Martins, F., Ibberson, D. J., Hutin, L., Bertrand, B., Stelmashenko, N., Robinson, J. A. W., Ibberson, L., Hashim, A., Siddiqi, I., Lee, A., Vinet, M., Smith, C. G., Morton, J. J. L., Gonzalez-Zalba, M. F. |
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| Rok vydání: | 2022 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Three key metrics for readout systems in quantum processors are measurement speed, fidelity and footprint. Fast high-fidelity readout enables mid-circuit measurements, a necessary feature for many dynamic algorithms and quantum error correction, while a small footprint facilitates the design of scalable, highly-connected architectures with the associated increase in computing performance. Here, we present two complementary demonstrations of fast high-fidelity single-shot readout of spins in silicon quantum dots using a compact, dispersive charge sensor: a radio-frequency single-electron box. The sensor, despite requiring fewer electrodes than conventional detectors, performs at the state-of-the-art achieving spin read-out fidelity of 99.2% in less than 6 $\mu$s. We demonstrate that low-loss high-impedance resonators, highly coupled to the sensing dot, in conjunction with Josephson parametric amplification are instrumental in achieving optimal performance. We quantify the benefit of Pauli spin blockade over spin-dependent tunneling to a reservoir, as the spin-to-charge conversion mechanism in these readout schemes. Our results place dispersive charge sensing at the forefront of readout methodologies for scalable semiconductor spin-based quantum processors. Comment: Main: 9 pages, 4 figures, 1 table. Supplementary: 33 pages, 18 figures |
| Databáze: | arXiv |
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