Improvement of continuous-variable quantum key distribution systems by using optical preamplifiers
arXiv:0812.4314 · doi:10.1088/0953-4075/42/11/114014
Abstract
Continuous-variable quantum key distribution protocols, based on Gaussian modulation of the quadratures of coherent states, have been implemented in recent experiments. A present limitation of such systems is the finite efficiency of the detectors, which can in principle be compensated for by the use of classical optical preamplifiers. Here we study this possibility in detail, by deriving the modified secret key generation rates when an optical parametric amplifier is placed at the output of the quantum channel. After presenting a general set of security proofs, we show that the use of preamplifiers does compensate for all the imperfections of the detectors when the amplifier is optimal in terms of gain and noise. Imperfect amplifiers can also enhance the system performance, under conditions which are generally satisfied in practice.
11 pages, 7 figures, submitted to J. Phys. B (special issue on Few Atoms Optics)
References in corpus (17)
- Continuous variable quantum cryptography using coherent states
- Quantum key distribution using gaussian-modulated coherent states
- Continuous variable quantum cryptography
- Unconditional optimality of Gaussian attacks against continuous-variable QKD
- Quantum key distribution over 25 km with an all-fiber continuous-variable system
- Quantum Cryptography without Switching
- Quantum cryptography with squeezed states
- Optimality of Gaussian Attacks in Continuous Variable Quantum Cryptography
- Quantum Distribution of Gaussian Keys with Squeezed States
- Multidimensional reconciliation for continuous-variable quantum key distribution
- Virtual Entanglement and Reconciliation Protocols for Quantum Cryptography with Continuous Variables
- Continuous-variable quantum cryptography is secure against non-gaussian attacks
- Quantum cloning with an optical fiber amplifier
- Security of coherent state quantum cryptography in the presence of Gaussian noise
- Coherent State Quantum Key Distribution Without Random Basis Switching
- Tight bound on coherent states quantum key distribution with heterodyne detection
- Heisenberg-limited eavesdropping on the continuous-variable quantum cryptographic protocol with no basis switching is impossible
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- A modified practical homodyne detector model for continuous-variable quantum key distribution: detailed security analysis and improvement by the phase-sensitive amplifier
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- Approaching the Key Rate Limit in Continuous-Variable Quantum Key Distribution Network
- Quantum hacking: Induced-photorefraction attack on a practical continuous-variable quantum key distribution system
- QOSST: A Highly-Modular Open Source Platform for Experimental Continuous-Variable Quantum Key Distribution
- An introductory review of the theory of continuous-variable quantum key distribution: Fundamentals, protocols, and security
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