Tools for the Security Analysis of Quantum Key Distribution in Infinite Dimensions

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Date

2021-08-12

Authors

Upadhyaya, Twesh

Advisor

Lütkenhaus, Norbert

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Publisher

University of Waterloo

Abstract

We develop a method to connect the infinite-dimensional description of optical continuous-variable quantum key distribution (QKD) protocols to a finite-dimensional formulation. The secure key rates of the optical QKD protocols can then be evaluated using recently-developed reliable numerical methods for key rate calculations. We apply this method to obtain asymptotic key rates for discrete-modulated continuous-variable QKD protocols, which are of practical significance due to their experimental simplicity and potential for large-scale deployment in quantum-secured networks. Importantly, our security proof does not require the photon-number cutoff assumption relied upon in previous works. We also demonstrate that our method can provide practical advantages over the flag-state squasher when applied to discrete-variable protocols.

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Keywords

quantum information, quantum communication

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