Phys. Rev. Lett. 103, 160503 (2009) [4 pages]

Rapid Single-Shot Measurement of a Singlet-Triplet Qubit

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C. Barthel¹, D. J. Reilly^1,2, C. M. Marcus¹, M. P. Hanson³, and A. C. Gossard³
¹Department of Physics, Harvard University, 17 Oxford Street, Cambridge, Massachusetts 02138, USA
²School of Physics, University of Sydney, Sydney, 2006, Australia
³Materials Department, University of California, Santa Barbara, California 93106, USA

Received 2 February 2009; published 14 October 2009

We report repeated single-shot measurements of the two-electron spin state in a GaAs double quantum dot. The readout allows measurement with a fidelity above 90% with a ∼7 μs cycle time. Hyperfine-induced precession between singlet and triplet states of the two-electron system are directly observed, as nuclear Overhauser fields are quasistatic on the time scale of the measurement cycle. Repeated measurements on millisecond to second time scales reveal the evolution of the nuclear environment.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.103.160503

DOI:

10.1103/PhysRevLett.103.160503

PACS:

03.67.Lx, 73.63.Kv

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Phys. Rev. Lett. 103, 160503 (2009) [4 pages]

Rapid Single-Shot Measurement of a Singlet-Triplet Qubit