Natural mode entanglement as a resource for quantum communication

Abstract

Natural particle-number entanglement resides between spatial modes in coherent ultra-cold atomic gases. However, operations on the modes are restricted by a superselection rule that forbids coherent superpositions of different particle numbers. This seemingly prevents mode entanglement being used as a resource for quantum communication. In this paper, we demonstrate that mode entanglement of a single massive particle can be used for dense coding and quantum teleportation despite the superselection rule. In particular, we provide schemes where the dense coding linear photonic channel capacity is reached without a shared reservoir and where the full quantum channel capacity is achieved if both parties share a coherent particle reservoir.

4 pages, 1 figure

References in corpus (4)

• Beating the channel capacity limit for linear photonic superdense coding
• Reference frames, superselection rules, and quantum information
• How to observe a coherent superposition of an atom and a molecule
• Spatial Entanglement From Off-Diagonal Long Range Order in a BEC

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