Dimension Reduction in Quantum Key Distribution for Continuous- and Discrete-Variable Protocols
| Autor: | Jie Lin, Twesh Upadhyaya, Thomas Van Himbeeck, Norbert Lütkenhaus |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Security analysis
Quantum Physics Computer science Dimensionality reduction General Engineering FOS: Physical sciences Quantum key distribution Topology 01 natural sciences 010305 fluids & plasmas 0103 physical sciences General Earth and Planetary Sciences Discrete variable Quantum Physics (quant-ph) 010306 general physics Computer Science::Databases General Environmental Science Computer Science::Cryptography and Security |
| Popis: | 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. 25 pages, 9 figures |
| Databáze: | OpenAIRE |
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