Enhanced energy-constrained quantum communication over bosonic Gaussian channels

Abstract

Quantum communication is an important branch of quantum information science, promising unconditional security to classical communication and providing the building block of a future large-scale quantum network. Noise in realistic quantum communication channels imposes fundamental limits on the communication rates of various quantum communication tasks. It is therefore crucial to identify or bound the quantum capacities of a quantum channel. Here, we consider Gaussian channels that model energy loss and thermal noise errors in realistic optical and microwave communication channels and study their various quantum capacities in the energy-constrained scenario. We provide improved lower bounds to various energy-constrained quantum capacities of these fundamental channels and show that higher communication rates can be attained than previously believed. Specifically, we show that one can boost the transmission rates of quantum information and private classical information by using a correlated multi-mode thermal state instead of the single-mode thermal state of the same energy.

15 pages, 5 figures

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Cited by in corpus (21)

• Advances in Quantum Cryptography
• Encoding an oscillator into many oscillators
• Gaussian quantum estimation of the lossy parameter in a thermal environment
• Convergence rates for the quantum central limit theorem
• Entropic singularities give rise to quantum transmission
• Restoring quantum communication efficiency over high loss optical fibres
• Bosonic quantum communication across arbitrarily high loss channels
• Magic Resource Can Enhance the Quantum Capacity of Channels
• Maximum tolerable excess noise in continuous-variable quantum key distribution and improved lower bound on two-way capacities
• Quantum-enabled communication without a phase reference
• Quantum Optical Communication in the presence of strong attenuation noise
• Secure Quantum Pattern Communication
• Entanglement cost for infinite-dimensional physical systems
• Optical fibres with memory effects and their quantum communication capacities
• Constraints on Gaussian Error Channels and Measurements for Quantum Communication
• Upper bounds on the private capacity for bosonic Gaussian channels
• Energy-limited quantum dynamics
• Bounding the quantum capacity with flagged extensions
• Detecting Quantum Capacities of Continuous-Variable Quantum Channels
• Exploring the quantum capacity of a Gaussian random displacement channel using Gottesman-Kitaev-Preskill codes and maximum likelihood decoding
• Linear-optical protocols for mitigating and suppressing noise in bosonic systems