Coherent spin manipulation in an exchange-only qubit

Laird, E A and Taylor, J M and DiVincenzo, DP and Marcus, C M and Hanson, M P and Gossard, A C (2010) Coherent spin manipulation in an exchange-only qubit. Physical review B, 82 (7). ISSN 1098-0121

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Initialization, two-spin coherent manipulation, and readout of a three-spin qubit are demonstrated using a few-electron triple quantum dot. The three-spin qubit is designed to allow all operations for full qubit control to be tuned via nearest-neighbor exchange interaction. Fast readout of charge states takes advantage of multiplexed reflectometry. Decoherence measured in a two-spin subspace is found to be consistent with predictions based on gate voltage noise with a uniform power spectrum. The theory of the exchange-only qubit is developed and it is shown that initialization of only two spins suffices for operation. Requirements for full multiqubit control using only exchange and electrostatic interactions are outlined.

Item Type:
Journal Article
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Physical review B
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04 Apr 2018 10:56
Last Modified:
19 Sep 2023 01:53