Local Gaussian operations can enhance continuous-variable entanglement distillation

Journal Article · Thu Dec 15 00:00:00 EST 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.84.062309· OSTI ID:22095569

Shengli, Zhang; Loock, Peter van ^[1]

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1. Optical Quantum Information Theory Group, Max Planck Institute for the Science of Light, Guenther-Scharowsky-Strasse 1/Bau 26, DE-91058 Erlangen (Germany)

Entanglement distillation is a fundamental building block in long-distance quantum communication. Though known to be useless on their own for distilling Gaussian entangled states, local Gaussian operations may still help to improve non-Gaussian entanglement distillation schemes. Here we show that by applying local squeezing operations both the performance and the efficiency of existing distillation protocols can be enhanced. We find that such an enhancement through local Gaussian unitaries can be obtained even when the initially shared Gaussian entangled states are mixed, as, for instance, after their distribution through a lossy-fiber communication channel.

• OSTI ID: 22095569
• Journal Information: Physical Review. A, Vol. 84, Issue 6; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DATA TRANSMISSION
EFFICIENCY
FIBERS
GAUSS FUNCTION
PERFORMANCE
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS
QUANTUM STATES
UNITARITY