Quantum Throughput: Quantifying quantum communication with homodyne measurements

Abstract

Quantum communication relies on optical implementations of channels, memories and repeaters. In the absence of perfect devices, a minimum requirement on real-world devices is that they preserve quantum correlations, meaning that they have some thoughput of a quantum mechanical nature. Previous work has verified throughput in optical devices while using minimal resources. We extend this approach to the quantitative regime. Our method is illustrated in a setting where the input consists of two coherent states while the output is measured by two homodyne measurement settings.

9 pages, 3 figures. v2: minor modifications, results unchanged

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Cited by in corpus (8)

• Atmospheric continuous-variable quantum communication
• Optimal working points for continuous-variable quantum channels
• Strong quantitative benchmarking of quantum optical devices
• Quantum benchmarking with realistic states of light
• Quantum Benchmark via an Uncertainty Product of Canonical Variables
• Composability of partially entanglement breaking channels via entanglement assisted local operations and classical communication
• Einstein-Podolsky-Rosen-like correlation on a coherent-state basis and inseparability of two-mode Gaussian states
• Converting separable conditions to entanglement breaking conditions