Security of Quantum Key Distribution with Realistic Devices
arXiv:quant-ph/0503057
Abstract
We simulate quantum key distribution (QKD) experimental setups and give out some improvement for QKD procedures. A new data post-processing protocol is introduced, mainly including error correction and privacy amplification. This protocol combines the ideas of GLLP and the decoy states, which essentially only requires to turn up and down the source power. We propose a practical way to perform the decoy state method, which mainly follows the idea of Lo's decoy state. A new data post-processing protocol is then developed for the QKD scheme with the decoy state. We first study the optimal expected photon number mu of the source for the improved QKD scheme. We get the new optimal mu=O(1) comparing with former mu=O(eta), where eta is the overall transmission efficiency. With this protocol, we can then improve the key generation rate from quadratic of transmission efficiency O(eta2) to O(eta). Based on the recent experimental setup, we obtain the maximum secure transmission distance of over 140 km.
This was a Master Report submitted in September 2004 to the University of Toronto, as a part of my Masters Degree Requirement
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Cited by in corpus (8)
- Decoy State Quantum Key Distribution
- Secure quantum key distribution with realistic devices
- Experimental Quantum Key Distribution with Decoy States
- Quantum key distribution with entangled photon sources
- Experimental Passive Decoy-State Quantum Key Distribution
- Stringent Statistical Fluctuation Analysis for Quantum Key Distribution Considering After-pulse Contributions
- Security of quantum key distribution using weak coherent states with nonrandom phases
- Quantum cryptography: theory and practice