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Near-unit-fidelity entanglement distribution scheme using Gaussian communication

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons201161

Praxmeyer,  Ludmila
Optical Quantum Information Theory, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons201222

van Loock,  Peter
van Loock Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;

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Praxmeyer, L., & van Loock, P. (2010). Near-unit-fidelity entanglement distribution scheme using Gaussian communication. PHYSICAL REVIEW A, 81(6): 060303. doi:10.1103/PhysRevA.81.060303.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-6AF3-2
Abstract
We show how to distribute with percentage success probabilities almost perfectly entangled qubit memory pairs over repeater channel segments of the order of the optical attenuation distance. In addition to some weak, dispersive light-matter interactions, only Gaussian state transmissions and measurements are needed for this scheme. Our protocol outperforms the existing coherent-state-based schemes for entanglement distribution, even those using error-free non-Gaussian measurements. This is achieved through two innovations: First, optical squeezed states are utilized instead of coherent states. Second, the amplitudes of the bright signal pulses are reamplified at each repeater station. This latter variation is a strategy reminiscent of classical repeaters and would be impossible in single-photon-based schemes.