Entanglement-assisted capacity regions and protocol designs for quantum multiple-access channels

Abstract

We solve the entanglement-assisted (EA) classical capacity region of quantum multiple-access channels with an arbitrary number of senders. As an example, we consider the bosonic thermal-loss multiple-access channel and solve the one-shot capacity region enabled by an entanglement source composed of sender-receiver pairwise two-mode squeezed vacuum states. The EA capacity region is strictly larger than the capacity region without entanglement-assistance. With two-mode squeezed vacuum states as the source and phase modulation as the encoding, we also design practical receiver protocols to realize the entanglement advantages. Four practical receiver designs, based on optical parametric amplifiers, are given and analyzed. In the parameter region of a large noise background, the receivers can enable a simultaneous rate advantage of 82.0% for each sender. Due to teleportation and superdense coding, our results for EA classical communication can be directly extended to EA quantum communication at half of the rates. Our work provides a unique and practical network communication scenario where entanglement can be beneficial.

arXiv comment8+10 pages, 11 figures, accepted by npj Quantum Inf

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Cited by in corpus (7)

• Entanglement-Based Quantum Information Technology
• Entanglement-Assisted Communication Surpassing the Ultimate Classical Capacity
• Computation-aided classical-quantum multiple access to boost network communication speeds
• Enhancement of nonclassical properties of two-mode squeezed vacuum state with postselected von Neumann measurement
• Optimized protocols for duplex quantum transduction
• Computable limits of optical multiple-access communications
• The Quantum Multiple-Access Channel with Cribbing Encoders