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arxiv: 0912.4132 · v2 · submitted 2009-12-21 · 🪐 quant-ph

A simple proof that Gaussian attacks are optimal among collective attacks against continuous-variable quantum key distribution with a Gaussian modulation

classification 🪐 quant-ph
keywords attacksgaussiandistributionproofquantumcollectivemodulationoptimal
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In this paper, we give a simple proof of the fact that the optimal collective attacks against continous-variable quantum key distribution with a Gaussian modulation are Gaussian attacks. Our proof makes use of symmetry properties of the quantum key distribution protocol in phase-space.

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