Quantum repeaters with entangled coherent states

Abstract

Entangled coherent states can be prepared remotely by subtracting non-locally a single photon from two quantum superpositions of coherent states, the so-called "Schroedinger's cat" state. Such entanglement can further be distributed over longer distances by successive entanglement swapping operations using linear optics and photon-number resolving detectors. The aim of this paper is to evaluate the performance of this approach to quantum repeaters for long distance quantum communications. Despite many attractive features at first sight, we show that, when using state-of-the-art photon counters and quantum memories, they do not achieve higher entanglement generation rates than repeaters based on single-photon entanglement. We discuss potential developments which may take better advantage of the richness of entanglement based on continuous variables, including in particular efficient parity measurements.

References in corpus (11)

• Generation of a superposition of odd photon number states for quantum information networks
• Quantum Repeaters with Photon Pair Sources and Multi-Mode Memories
• Observation of squeezed light with 10dB quantum noise reduction
• Experimental demonstration of a BDCZ quantum repeater node
• Increasing entanglement between Gaussian states by coherent photon subtraction
• Non-Gaussian entanglement distillation for continuous variables
• Generation of large-amplitude coherent-state superposition via ancilla-assisted photon-subtraction
• Long-Distance Entanglement Distribution with Single-Photon Sources
• Robust and Efficient Quantum Repeaters with Atomic Ensembles and Linear Optics
• A fast and robust approach to long-distance quantum communication with atomic ensembles
• Towards experimental entanglement connection with atomic ensembles in the single excitation regime

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