Coherent Spin Manipulation in an Exchange-Only Qubit

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Coherent Spin Manipulation in an Exchange-Only Qubit

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Title: Coherent Spin Manipulation in an Exchange-Only Qubit
Author: Laird, Edward A.; Taylor, Jacob Mason; Di Vincenzo, David P.; Marcus, Charles Masamed; Hanson, Micah P.; Gossard, Arthur C.

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Citation: Laird, Edward A., Jacob M. Taylor, David P. Di Vincenzo, Charles M. Marcus, Micah P. Hanson, and Arthur C. Gossard. 2011. Coherent spin manipulation in an exchange-only qubit. Physical Review B, Condensed Matter and Materials Physics 82(7): 075403.
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Abstract: 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.
Published Version: doi:10.1103/PhysRevB.82.075403
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