Oakes, GA;
Ciriano-Tejel, VN;
Wise, DF;
Fogarty, MA;
Lundberg, T;
Laine, C;
Schaal, S;
... Gonzalez-Zalba, MF; + view all
(2023)
Fast High-Fidelity Single-Shot Readout of Spins in Silicon Using a Single-Electron Box.
Physical Review X
, 13
(1)
, Article 011023. 10.1103/PhysRevX.13.011023.
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Abstract
Three key metrics for readout systems in quantum processors are measurement speed, fidelity, and footprint. Fast high-fidelity readout enables midcircuit 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 readout fidelity of 99.2% in less than 6 μs fitted from a physical model. 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.
| Type: | Article |
|---|---|
| Title: | Fast High-Fidelity Single-Shot Readout of Spins in Silicon Using a Single-Electron Box |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevX.13.011023 |
| Publisher version: | https://doi.org/10.1103/PhysRevX.13.011023 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, Condensed Matter Physics, Electronics, Semiconductor Physics, QUANTUM LOGIC, GATE, QUBITS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10167402 |
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