Robust Single-Shot Spin Measurement with 99.5% Fidelity in a Quantum Dot Array

Takashi Nakajima; Matthieu R. Delbecq; Tomohiro Otsuka; Peter Stano; Shinichi Amaha; Jun Yoneda; Akito Noiri; Kento Kawasaki; Kenta Takeda; Giles Allison; Arne Ludwig; Andreas D. Wieck; Daniel Loss; Seigo Tarucha

doi:10.1103/PhysRevLett.119.017701

Robust Single-Shot Spin Measurement with 99.5% Fidelity in a Quantum Dot Array

Takashi Nakajima, Matthieu R. Delbecq, Tomohiro Otsuka, Peter Stano, Shinichi Amaha, Jun Yoneda, Akito Noiri, Kento Kawasaki, Kenta Takeda, Giles Allison, Arne Ludwig, Andreas D. Wieck, Daniel Loss, Seigo Tarucha

Research output: Contribution to journal › Article

25 Citations (Scopus)

Abstract

We demonstrate a new method for projective single-shot measurement of two electron spin states (singlet versus triplet) in an array of gate-defined lateral quantum dots in GaAs. The measurement has very high fidelity and is robust with respect to electric and magnetic fluctuations in the environment. It exploits a long-lived metastable charge state, which increases both the contrast and the duration of the charge signal distinguishing the two measurement outcomes. This method allows us to evaluate the charge measurement error and the spin-to-charge conversion error separately. We specify conditions under which this method can be used, and project its general applicability to scalable quantum dot arrays in GaAs or silicon.

Original language	English
Article number	017701
Journal	Physical Review Letters
Volume	119
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevLett.119.017701
Publication status	Published - 2017 Jul 6
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.119.017701

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Nakajima, T., Delbecq, M. R., Otsuka, T., Stano, P., Amaha, S., Yoneda, J., Noiri, A., Kawasaki, K., Takeda, K., Allison, G., Ludwig, A., Wieck, A. D., Loss, D., & Tarucha, S. (2017). Robust Single-Shot Spin Measurement with 99.5% Fidelity in a Quantum Dot Array. Physical Review Letters, 119(1), [017701]. https://doi.org/10.1103/PhysRevLett.119.017701

Robust Single-Shot Spin Measurement with 99.5% Fidelity in a Quantum Dot Array. / Nakajima, Takashi; Delbecq, Matthieu R.; Otsuka, Tomohiro; Stano, Peter; Amaha, Shinichi; Yoneda, Jun; Noiri, Akito; Kawasaki, Kento; Takeda, Kenta; Allison, Giles; Ludwig, Arne; Wieck, Andreas D.; Loss, Daniel; Tarucha, Seigo.

In: Physical Review Letters, Vol. 119, No. 1, 017701, 06.07.2017.

Research output: Contribution to journal › Article

Nakajima, Takashi ; Delbecq, Matthieu R. ; Otsuka, Tomohiro ; Stano, Peter ; Amaha, Shinichi ; Yoneda, Jun ; Noiri, Akito ; Kawasaki, Kento ; Takeda, Kenta ; Allison, Giles ; Ludwig, Arne ; Wieck, Andreas D. ; Loss, Daniel ; Tarucha, Seigo. / Robust Single-Shot Spin Measurement with 99.5% Fidelity in a Quantum Dot Array. In: Physical Review Letters. 2017 ; Vol. 119, No. 1.

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