期刊
PHYSICAL REVIEW A
卷 97, 期 5, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.97.052327
关键词
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资金
- Innovation Fund Denmark within the Quantum Innovation Center Qubiz
- U.K. Quantum Communications hub [EP/M013472/1]
- Engineering and Physical Sciences Research Council [EP/M013472/1] Funding Source: researchfish
- EPSRC [EP/M013472/1] Funding Source: UKRI
We present a rigorous security analysis of continuous-variable measurement- device-independent quantum key distribution (CV MDI QKD) in a finite-size scenario. The security proof is obtained in two steps: by first assessing the security against collective Gaussian attacks, and then extending to the most general class of coherent attacks via the Gaussian de Finetti reduction. Our result combines recent state-of-the-art security proofs for CV QKD with findings about min-entropy calculus and parameter estimation. In doing so, we improve the finite-size estimate of the secret key rate. Our conclusions confirm that CV MDI protocols allow for high rates on the metropolitan scale, and may achieve a nonzero secret key rate against the most general class of coherent attacks after 10(7)-10(9) quantum signal transmissions, depending on loss and noise, and on the required level of security.
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