Single photon continuous variable quantum key distribution based on energy-time uncertainty relation

Abstract

In previous quantum key distribution (QKD) protocols, information is encoded on either the discrete-variable of single-photon signal or continuous-variables of multi-photon signal. Here, we propose a new QKD protocol by encoding information on continuous-variables of a single photon. In this protocol, Alice randomly encodes her information on either the central frequency of a narrow-band single photon pulse or the time-delay of a broadband single photon pulse, while Bob randomly chooses to do either frequency measurement or time measurement. The security of this protocol rests on the energy-time uncertainty relation, which prevents Eve from simultaneously determining both frequency and time information with arbitrarily high resolution. In practice, this scheme may be more robust against various channel noises, such as polarization and phase fluctuations.

4 pages, 3 figures

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• Numerical Assessment and Optimization of Discrete-Variable Time-Frequency Quantum Key Distribution
• Entropic uncertainty relations and the measurement range problem, with consequences for high-dimensional quantum key distribution
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• Programmable time-frequency mode-sorting of single photons with a multi-output quantum pulse gate
• How to Project onto an Arbitrary Single-Photon Wavepacket
• Hybrid classical-quantum communication networks
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• Entanglement based frequency-time coding quantum key distribution
• Practical high-dimensional quantum key distribution with decoy states