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Spin squeezing via quantum feedback

Phys. Rev. A 65, 061801(R) – Published 4 June 2002
L. K. Thomsen, S. Mancini, and H. M. Wiseman


We propose a quantum feedback scheme for producing deterministically reproducible spin squeezing. The results of a continuous nondemolition atom number measurement are fed back to control the quantum state of the sample. For large samples and strong cavity coupling, the squeezing parameter minimum scales inversely with atom number, approaching the Heisenberg limit. Furthermore, ceasing the measurement and feedback when this minimum has been reached will leave the sample in the maximally squeezed spin state.

DOI: http://dx.doi.org/10.1103/PhysRevA.65.061801

  • Received 23 October 2001
  • Published 4 June 2002

© 2002 The American Physical Society

Authors & Affiliations

L. K. Thomsen1, S. Mancini2,3, and H. M. Wiseman1

  • 1Centre for Quantum Dynamics, School of Science, Griffith University, Brisbane, Queensland 4111, Australia
  • 2Dipartimento di Fisica, Università di Camerino, I-62032 Camerino, Italy
  • 3INFM, Dipartimento di Fisica, Università di Milano, Via Celoria 16, I-20133 Milano, Italy

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