Journal
PHYSICAL REVIEW LETTERS
Volume 103, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.103.110502
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Funding
- National Natural Science Foundation of China [60702080, 60736011, 60621062]
- FANEDD [200755]
- Hi-Tech Research and Development Program of China [2006AA01Z102]
- National Science Foundation of the United States [0347078, 0622033]
- Direct For Computer & Info Scie & Enginr [0622033] Funding Source: National Science Foundation
- Division of Computing and Communication Foundations [0622033] Funding Source: National Science Foundation
- Division of Computing and Communication Foundations
- Direct For Computer & Info Scie & Enginr [0347078] Funding Source: National Science Foundation
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The weird phenomenon of quantum nonlocality without entanglement means that local quantum operations assisted by classical communication constitute a proper subset of the class of separable quantum operations. Despite considerable recent advances, little is known to what extent the class of separable operations differs from local quantum operations and classical communication. In this Letter we show that separable operations are generally stronger than local quantum operations and classical communication when distilling a mixed state into a pure entangled state and thus confirm the existence of entanglement monotones that can increase under separable operations. Our finding can also be interpreted as confirming the ability of separable operations to enhance the entanglement of mixed states relative to certain measures, a sensible but important fact that has never been rigorously proven before.
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