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Nonadiabatic quantum control of a semiconductor charge qubit

Author(s): Dovzhenko, Y; Stehlik, J; Petersson, KD; Petta, Jason R; Lu, H; et al

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Abstract: We demonstrate multipulse quantum control of a single electron charge qubit. The qubit is manipulated by applying nonadiabatic voltage pulses to a surface depletion gate and readout is achieved using a quantum point-contact charge sensor. We observe Ramsey fringes in the excited-state occupation in response to a pi/2-pi/2 pulse sequence and extract T-2* similar to 60 ps away from the charge degeneracy point. Simulations suggest these results may be extended to implement a charge echo by reducing the interdot tunnel coupling and pulse rise time, thereby increasing the nonadiabaticity of the pulses.
Publication Date: 15-Oct-2011
Electronic Publication Date: 7-Oct-2011
Citation: Dovzhenko, Y, Stehlik, J, Petersson, KD, Petta, JR, Lu, H, Gossard, AC. (2011). Nonadiabatic quantum control of a semiconductor charge qubit. PHYSICAL REVIEW B, 84 (10.1103/PhysRevB.84.161302
DOI: doi:10.1103/PhysRevB.84.161302
ISSN: 1098-0121
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW B
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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