Effect of source statistics on utilizing photon entanglement in quantum key distribution

2020/08/31 by Radim Hošák, Ivo Straka, Ana Predojević +2 · 17 citations
Computer Science · Physics and Astronomy · #Computer science #Key (lock) #Photon #Photon entanglement #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum entanglement #Quantum key distribution #Quantum mechanics #Quantum network #Quantum sensor #Spontaneous parametric down-conversion #Workflow #quant-ph

paper · pdf · doi:10.1103/physreva.103.042411

published in Physical Review A 103(4) (American Physical Society) · 13 pages, 5 figures

openalex created_date 2020/08/21 · openalex publication_date 2021/04/13 · arxiv created 2021/04/26 · arxiv updated 2021/04/27 · openalex updated_date 2026/08/05

Abstract

A workflow for evaluation of entanglement source quality is proposed. Based on quantum state density matrices obtained from theoretical models and experimental data, we make an estimate of a potential performance of a quantum entanglement source in quantum key distribution protocols. This workflow is showcased for continuously pumped spontaneous parametric down-conversion (SPDC) source, where it highlights the trade-off between entangled pair generation rate and entanglement quality caused by multiphoton nature of the generated quantum states. We employ this characterization technique to show that secure key rate of down-converted photon pairs is limited to 0.029 bits per detection window due to intrinsic multiphoton contributions. We also report that there exists one optimum gain for continuous-wave down-conversion sources. We find a bound for secure key rate extracted from SPDC sources and make a comparison with perfectly single-pair quantum states, such as those produced by quantum dots.

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