Rapid gate-based spin read-out in silicon using an on-chip resonator

Rapid gate-based spin read-out in silicon using an on-chip resonator

Zheng, G. (TU Delft QCD/Vandersypen Lab; Kavli institute of nanoscience Delft)
Samkharadze, Nodar (TU Delft QCD/Vandersypen Lab; TNO; Kavli institute of nanoscience Delft)
Noordam, M.L. (TU Delft QN/Kuipers Lab; Kavli institute of nanoscience Delft)
Kalhor, N. (TU Delft QN/Afdelingsbureau; Kavli institute of nanoscience Delft)
Brousse, D. (TNO)
Sammak, A. (TNO)
Scappucci, G. (TU Delft QCD/Scappucci Lab; Kavli institute of nanoscience Delft)
Vandersypen, L.M.K. (TU Delft QCD/Vandersypen Lab; TU Delft QN/Vandersypen Lab; Kavli institute of nanoscience Delft)

2019

Silicon spin qubits are one of the leading platforms for quantum computation^1,2. As with any qubit implementation, a crucial requirement is the ability to measure individual quantum states rapidly and with high fidelity. Since the signal from a single electron spin is minute, the different spin states are converted to different charge states^3,4. Charge detection, so far, has mostly relied on external electrometers^5–7, which hinders scaling to two-dimensional spin qubit arrays^2,8,9. Alternatively, gate-based dispersive read-out based on off-chip lumped element resonators has been demonstrated^10–13, but integration times of 0.2–2 ms were required to achieve single-shot read-out^14–16. Here, we connect an on-chip superconducting resonant circuit to two of the gates that confine electrons in a double quantum dot. Measurement of the power transmitted through a feedline coupled to the resonator probes the charge susceptibility, distinguishing whether or not an electron can oscillate between the dots in response to the probe power. With this approach, we achieve a signal-to-noise ratio of about six within an integration time of only 1 μs. Using Pauli’s exclusion principle for spin-to-charge conversion, we demonstrate single-shot read-out of a two-electron spin state with an average fidelity of >98% in 6 μs. This result may form the basis of frequency-multiplexed read-out in dense spin qubit systems without external electrometers, therefore simplifying the system architecture.

http://resolver.tudelft.nl/uuid:a1dc0efd-3117-4cf5-83ae-03cab2e73a7c

https://doi.org/10.1038/s41565-019-0488-9

2020-01-08

1748-3387

Nature Nanotechnology, 14 (8), 742-746

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2019 G. Zheng, Nodar Samkharadze, M.L. Noordam, N. Kalhor, D. Brousse, A. Sammak, G. Scappucci, L.M.K. Vandersypen