Spin entanglement, decoherence and Bohm's EPR paradox
Date
2009-10-01
Authors
Cavalcanti, E G
Drummond, Peter David
Bachor, Hans
Reid, M D
Journal Title
Journal ISSN
Volume Title
Publisher
Optical Society of America
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.
Description
Keywords
quantum information and processing, squeezed states, Bose-Einstein condensates
Citation
Optics Express 17.21 (2009): 18693-18702
Collections
Source
Optics Express
Type
Journal article
Book Title
Entity type
Access Statement
License Rights
Restricted until
Downloads
File
Description