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APS » Journals » Phys. Rev. B » Volume 78 » Issue 24
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Phys. Rev. B 78, 245302 (2008) [8 pages]

Quantum nondemolition measurements of single donor spins in semiconductors

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Mohan Sarovar1, Kevin C. Young2, Thomas Schenkel3, and K. Birgitta Whaley1
1Department of Chemistry, Berkeley Center for Quantum Information and Computation, University of California–Berkeley, Berkeley, California 94720, USA
2Department of Physics, Berkeley Center for Quantum Information and Computation, University of California–Berkeley, Berkeley, California 94720, USA
3Accelerator and Fusion Research Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

Received 30 September 2008; published 4 December 2008

We propose a technique for measuring the state of a single donor-electron spin using a field-effect transistor induced two-dimensional electron gas and electrically detected magnetic-resonance techniques. The scheme is facilitated by hyperfine coupling to the donor nucleus. We analyze the potential sensitivity and outline experimental requirements. Our measurement provides a single-shot, projective, and quantum nondemolition measurement of an electron-encoded qubit state.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.78.245302
DOI:
10.1103/PhysRevB.78.245302
PACS:
73.23.−b, 03.67.Lx, 76.30.−v, 84.37.+q
 
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