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Coherent spin manipulation in an exchange-only qubit

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  • E A Laird
  • J M Taylor
  • DP DiVincenzo
  • C M Marcus
  • M P Hanson
  • A C Gossard
Article number075403
<mark>Journal publication date</mark>4/08/2010
<mark>Journal</mark>Physical review B
Issue number7
Number of pages6
Publication StatusPublished
<mark>Original language</mark>English


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.