Spin entanglement, decoherence and Bohm's EPR paradox
arXiv:0711.3798 · doi:10.1364/OE.17.018693
Abstract
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.
4 pages 3 figures
References in corpus (14)
- Finite-Time Disentanglement via Spontaneous Emission
- Steering, Entanglement, Nonlocality, and the EPR Paradox
- Sudden Death of Entanglement
- Towards quantum superpositions of a mirror
- Squeezing and entanglement in a Bose-Einstein condensate
- Observation of squeezed light with 10dB quantum noise reduction
- A wavelength-tunable fiber-coupled source of narrowband entangled photons
- Violation of local uncertainty relations as a signature of entanglement
- Dark periods and revivals of entanglement in a two qubit system
- An experimental investigation of criteria for continuous variable entanglement
- Observation of -9 dB quadrature squeezing with improvement of phase stability in homodyne measurement
- Entanglement Detection in Optical Lattices of Bosonic Atoms with Collective Measurements
- Uncertainty relations for the realisation of macroscopic quantum superpositions and EPR paradoxes
- Entanglement witnesses and a loophole problem
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- Macroscopic delayed-choice and retrocausality: quantum eraser, Leggett-Garg and dimension witness tests with cat states
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- Diagnosing steerability of a bipartite state with the nonsteering threshold