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Phys. Rev. A 68, 032301 (2003) [14 pages]

Realistic simulations of single-spin nondemolition measurement by magnetic resonance force microscopy

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Todd A. Brun*
Institute for Advanced Study, Einstein Drive, Princeton, New Jersey 08540, USA

Hsi-Sheng Goan†
Center for Quantum Computer Technology, University of New South Wales, Sydney, New South Wales 2052, Australia

Received 25 February 2003; published 5 September 2003

A requirement for many quantum computation schemes is the ability to measure single spins. This paper examines one proposed scheme: magnetic resonance force microscopy (MRFM), including the effects of thermal noise and back action from monitoring. We derive a simplified equation using the adiabatic approximation and produce a stochastic pure state unraveling which is useful for numerical simulations. We also calculate the signal-to-noise ratio for single-spin measurement by MRFM, using a quantum Langevin equation approach.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.68.032301
DOI:
10.1103/PhysRevA.68.032301
PACS:
03.67.-a

*Email address: tbrun@ias.edu

†Mailing address: Center for Quantum Computer Technology, C/-Department of Physics, University of Queensland, Brisbane, Queensland 4072, Australia. Email address: goan@physics.uq.edu.au

 
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