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Heterodyne Detection for a Subcarrier Wave Quantum Key Distribution System

Михаил Арсеньевич Фадеев, P. A. Morozova, Semyon V. Smirnov +3 more

Radiophysics and Quantum ElectronicsOct 8, 20250 citations

08 SECURITY PROOF OF QUANTUM KEY DISTRIBUTION WITH DETECTION EFFICIENCY MISMATCH

Chi‐Hang Fred Fung, Kiyoshi Tamaki, Bing Qi +2 more

In theory, quantum key distribution (QKD) offers unconditional security based on the laws of physics. However, as demonstrated in recent quantum hacking theory and experimental papers, detection efficiency loophole can be fatal to the security of practical QKD systems. Here, we describe the physical origin of detection efficiency mismatch in various domains including spatial, spectral, and time domains and in various experimental set-ups. More importantly, we prove the unconditional security of QKD even with detection efficiency mismatch. We explicitly show how the key generation rate is characterized by the maximal detection efficiency ratio between the two detectors. Furthermore, we prove that by randomly switching the bit assignments of the detectors, the effect of detection efficiency mismatch can be completely eliminated.In theory, quantum key distribution (QKD) offers unconditional security based on the laws of physics. However, as demonstrated in recent quantum hacking theory and experimental papers, detection efficiency loophole can be fatal to the security of practical QKD systems. Here, we describe the physical origin of detection efficiency mismatch in various domains including spatial, spectral, and time domains and in various experimental set-ups. More importantly, we prove the unconditional security of QKD even with detection efficiency mismatch. We explicitly show how the key generation rate is characterized by the maximal detection efficiency ratio between the two detectors. Furthermore, we prove that by randomly switching the bit assignments of the detectors, the effect of detection efficiency mismatch can be completely eliminated.

Aug 16, 201666 citations

Integrated quantum key distribution using single sideband detection

Jean-Marc Mérolla, J.-P. Goedgebuer, Alexandre Soujaeff +3 more

Jan 1, 20020 citations

UNIFIED TREATMENT OF HETERODYNE DETECTION: THE SHAPIRO–WAGNER AND CAVES FRAMEWORKS

GIULIO LANDOLFI, GIOVANNA RUGGERI, GIULIO SOLIANI

A comparative study is performed on two heterodyne systems of photon detectors expressed in terms of a signal annihilation operator and an image band creation operator called Shapiro–Wagner and Caves' frame, respectively. This approach is based on the introduction of a convenient operator [Formula: see text] which allows a unified formulation of both cases. For the Shapiro–Wagner scheme, where [Formula: see text], quantum phase and amplitude are exactly defined in the context of relative number state (RNS) representation, while a procedure is devised to handle suitably and in a consistent way Caves' framework, characterized by [Formula: see text], within the approximate simultaneous measurements of noncommuting variables. In such a case RNS phase and amplitude make sense only approximately.A comparative study is performed on two heterodyne systems of photon detectors expressed in terms of a signal annihilation operator and an image band creation operator called Shapiro–Wagner and Caves' frame, respectively. This approach is based on the introduction of a convenient operator [Formula: see text] which allows a unified formulation of both cases. For the Shapiro–Wagner scheme, where [Formula: see text], quantum phase and amplitude are exactly defined in the context of relative number state (RNS) representation, while a procedure is devised to handle suitably and in a consistent way Caves' framework, characterized by [Formula: see text], within the approximate simultaneous measurements of noncommuting variables. In such a case RNS phase and amplitude make sense only approximately.

arXiv:quant-ph/0502027International Journal of Modern Physics BJun 10, 20051 citation

SECURITY USING QUANTUM KEY DISTRIBUTION PROTOCOLS (QKDPs)

D. N. Kartheek, Mohit Kumar, Mohit Kumar

Abstract — Most cryptographic mechanisms such as symmetric and asymmetric cryptography, often involve the use of cryptographic keys. However, all cryptographic techniques will be ineffective if the key distribution mechanism is weak. Quantum Key Distribution or Quantum Cryptography is attracting much attention as a solution of the problem of Key Distribution; QKD offers unconditionally secure communication based on quantum mechanics. This work presents quantum key distribution protocols (QKDP) to safeguard security in large networks, ushering in new directions in classical cryptography and quantum cryptography.Abstract — Most cryptographic mechanisms such as symmetric and asymmetric cryptography, often involve the use of cryptographic keys. However, all cryptographic techniques will be ineffective if the key distribution mechanism is weak. Quantum Key Distribution or Quantum Cryptography is attracting much attention as a solution of the problem of Key Distribution; QKD offers unconditionally secure communication based on quantum mechanics. This work presents quantum key distribution protocols (QKDP) to safeguard security in large networks, ushering in new directions in classical cryptography and quantum cryptography.

Jan 1, 20125 citations

Integrated quantum key distribution system using single-sideband detection

Jean-Marc Mérolla, J.-P. Goedgebuer, Alexandre Soujaeff +2 more

Jan 1, 20020 citations

HETERODYNE DETECTION FOR SUBCARRIER-WAVE QUANTUM KEY DISTRIBUTION SYSTEM

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