Unconditional Security of Time-Energy Entanglement Quantum Key Distribution Using Dual-Basis Interferometry

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Provided by: Cornell University
Topic: Security
Format: PDF
High-Dimensional Quantum Key Distribution (HDQKD) offers the possibility of high secure-key rate with high photon-information efficiency. The authors consider HDQKD based on the time-energy entanglement produced by spontaneous parametric down conversion, and show that it is secure against collective attacks. Its security rests upon visibility data - obtained from Franson and conjugate-Franson interferometers - that probe photon-pair frequency correlations and arrival-time correlations. From these measurements an upper bound can be established on the eavesdropper's Holevo information by translating the Gauassian-state security analysis for continuous-variable quantum key distribution so that it applies to their protocol.
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