Suppressing spin qubit dephasing by nuclear state preparation

D. J. Reilly, J. M. Taylor, J. R. Petta, C. M. Marcus, M. P. Hanson, A. C. Gossard

Research output: Contribution to journalArticlepeer-review

208 Scopus citations

Abstract

Coherent spin states in semiconductor quantum dots offer promise as electrically controllable quantum bits (qubits) with scalable fabrication. For few-electron quantum dots made from gallium arsenide (GaAs), fluctuating nuclear spins in the host lattice are the dominant source of spin decoherence. We report a method of preparing the nuclear spin environment that suppresses the relevant component of nuclear spin fluctuations below its equilibrium value by a factor of ∼70, extending the inhomogeneous dephasing time for the two-electron spin state beyond 1 microsecond. The nuclear state can be readily prepared by electrical gate manipulation and persists for more than 10 seconds.

Original languageEnglish (US)
Pages (from-to)817-821
Number of pages5
JournalScience
Volume321
Issue number5890
DOIs
StatePublished - Aug 8 2008

All Science Journal Classification (ASJC) codes

  • General

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