Device Calibration Impacts Security of Quantum Key Distribution

Jain, Nitin; Wittmann, Christoffer; Lydersen, Lars; Wiechers, Carlos; Elser, Dominique; Marquardt, Christoph; Makarov, Vadim; Leuchs, Gerd

doi:10.1103/PhysRevLett.107.110501

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Device Calibration Impacts Security of Quantum Key Distribution

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Jain, Nitin
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Wittmann, Christoffer
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201053

Elser, Dominique
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201126

Marquardt, Christoph
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201115

Leuchs, Gerd
Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Zitation

Jain, N., Wittmann, C., Lydersen, L., Wiechers, C., Elser, D., Marquardt, C., et al. (2011). Device Calibration Impacts Security of Quantum Key Distribution. PHYSICAL REVIEW LETTERS, 107(11): 110501. doi:10.1103/PhysRevLett.107.110501.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002D-698F-C

Zusammenfassung

Characterizing the physical channel and calibrating the cryptosystem hardware are prerequisites for establishing a quantum channel for quantum key distribution (QKD). Moreover, an inappropriately implemented calibration routine can open a fatal security loophole. We propose and experimentally demonstrate a method to induce a large temporal detector efficiency mismatch in a commercial QKD system by deceiving a channel length calibration routine. We then devise an optimal and realistic strategy using faked states to break the security of the cryptosystem. A fix for this loophole is also suggested.