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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 21 — Oct. 12, 2009
  • pp: 18693–18702

Spin entanglement, decoherence and Bohm’s EPR paradox

E. G. Cavalcanti, P. D. Drummond, H. A. Bachor, and M. D. Reid  »View Author Affiliations

Optics Express, Vol. 17, Issue 21, pp. 18693-18702 (2009)

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We obtain criteria for entanglement and the EPR paradox for spin-entangled particles and analyse the effects of decoherence caused by absorption and state purity errors. For a two qubit photonic state, entanglement can occur for all transmission efficiencies. In this case, the state preparation purity must be above a threshold value. However, Bohm’s spin EPR paradox can be achieved only above a critical level of loss. We calculate a required efficiency of 58%, which appears achievable with current quantum optical technologies. For a macroscopic number of particles prepared in a correlated state, spin entanglement and the EPR paradox can be demonstrated using our criteria for efficiencies η>1/3 and η>2/3 respectively. This indicates a surprising insensitivity to loss decoherence, in a macroscopic system of ultra-cold atoms or photons.

© 2009 Optical Society of America

OCIS Codes
(270.6570) Quantum optics : Squeezed states
(020.1475) Atomic and molecular physics : Bose-Einstein condensates
(270.5585) Quantum optics : Quantum information and processing

ToC Category:
Quantum Optics

Original Manuscript: August 10, 2009
Revised Manuscript: September 18, 2009
Manuscript Accepted: September 19, 2009
Published: October 1, 2009

E. G. Cavalcanti, P. D. Drummond, H. A. Bachor, and M. D. Reid, "Spin entanglement, decoherence and Bohm’s EPR paradox," Opt. Express 17, 18693-18702 (2009)

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