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Subsystem purity as an enforcer of entanglement.

Abstract:

We show that entanglement can always arise in the interaction of an arbitrarily large system in any mixed state with a single qubit in a pure state. This small initial purity is enough to enforce entanglement even when the total entropy is close to maximum. We demonstrate this feature using the Jaynes-Cummings interaction of a two-level atom in a pure state with a field in a thermal state at an arbitrarily high temperature. We find the time and temperature variation of a lower bound on the am...

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Publication status:
Published

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Institution:
University of Oxford
Department:
Oxford, MPLS, Physics, Atomic and Laser Physics
Role:
Author
Journal:
Physical review letters
Volume:
87
Issue:
5
Pages:
050401
Publication date:
2001-07-05
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
URN:
uuid:69377ccc-c411-40ef-a926-487c82d21e5a
Source identifiers:
154938
Local pid:
pubs:154938
Language:
English

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