Near-unit fidelity entanglement distribution using Gaussian communication

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, which even beats the coherent-state-benchmark for entanglement distribution based on error-free non-Gaussian measurements. This is achieved through two innovations: first, optical squeezed states are utilized instead of coherent states. Secondly, 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.

5 pages, 4 figures

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Cited by in corpus (5)

• Rate analysis for a hybrid quantum repeater
• Generation of phase-squeezed optical pulses with large coherent amplitudes by post-selection of single photon and weak cross-Kerr non-linearity
• Optimal entanglement manipulation via coherent-state transmission
• Entanglement Generation by Communication using Phase-Squeezed Light with Photon Loss
• Experimental pre-assessing entanglement in Gaussian states mixing