Modulation leakage vulnerability in continuous-variable quantum key distribution

• URL: http://arxiv.org/abs/2103.14567v1
• Date: Fri, 26 Mar 2021 16:28:08 GMT
• Title: Modulation leakage vulnerability in continuous-variable quantum key distribution
• Authors: Nitin Jain, Ivan Derkach, Hou-Man Chin, Radim Filip, Ulrik L. Andersen, Vladyslav C. Usenko, and Tobias Gehring
• Abstract summary: We report a modulation leakage vulnerability in a quantum key distribution system. The leakage arises from the limited suppression of a quantum-information-carrying sideband during modulation. Our results indicate that the leakage reduces the range over which a positive secret key can be obtained, and can even lead to a security breach.
• Score: 0.5863360388454261
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Flaws in the process of modulation, or encoding of key bits in the quadratures of the electromagnetic light field, can make continuous-variable quantum key distribution systems susceptible to leakage of secret information. Here, we report such a modulation leakage vulnerability in a system that uses an optical in-phase and quadrature modulator to implement a single sideband encoding scheme. The leakage arises from the limited suppression of a quantum-information-carrying sideband during modulation. Based on the results from a proof-of-concept experiment, we theoretically analyse the impact of this vulnerability. Our results indicate that the leakage reduces the range over which a positive secret key can be obtained, and can even lead to a security breach if not properly taken into account. We also study the effectiveness of additional trusted noise as a countermeasure to this vulnerability.

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