Research Article
Passive Decoy State Quantum Key Distribution
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@INPROCEEDINGS{10.1007/978-3-642-11731-2_17, author={Marcos Curty and Tobias Moroder and Xiongfeng Ma and Norbert L\'{y}tkenhaus}, title={Passive Decoy State Quantum Key Distribution}, proceedings={Quantum Communication and Quantum Networking. First International Conference, QuantumComm 2009, Naples, Italy, October 26-30, 2009, Revised Selected Papers}, proceedings_a={QUANTUMCOMM}, year={2012}, month={10}, keywords={Quantum cryptography quantum key distribution quantum communication threshold photon detector}, doi={10.1007/978-3-642-11731-2_17} }- Marcos Curty
Tobias Moroder
Xiongfeng Ma
Norbert Lütkenhaus
Year: 2012
Passive Decoy State Quantum Key Distribution
QUANTUMCOMM
Springer
DOI: 10.1007/978-3-642-11731-2_17
Abstract
The use of decoy states enhances the performance of practical quantum key distribution systems significantly by monitoring the quantum channel in a more detailed way. While active modulation of the intensity of the pulses is an effective way of preparing decoy states in principle, in practice passive preparation might be desirable in some scenarios. Known passive methods involve parametric down-conversion. In this paper we show how phase randomized coherent states can be used for the same purpose. Our method involves only linear optics together with a simple threshold photon detector. The performace is comparable to the active decoy methods.
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