| Issue |
EPL
Volume 79, Number 4, August 2007
|
|
|---|---|---|
| Article Number | 40001 | |
| Number of page(s) | 5 | |
| Section | General | |
| DOI | https://doi.org/10.1209/0295-5075/79/40001 | |
| Published online | 18 July 2007 | |
Improved practical decoy state method in quantum key distribution with parametric down-conversion source
1
Department of Microelectronics and Information Technology, The Royal Institute of Technology, KTH, Electrum 229 - SE-164 40 Kista, Sweden
2
Department of Physics, Tsinghua University - Beijing 100084, China
Received:
11
March
2007
Accepted:
25
June
2007
In this paper, a new decoy state scheme for quantum key distribution with parametric down-conversion source is proposed. We use both three-intensity decoy states and their triggered and nontriggered components to estimate the fraction of single-photon counts and the quantum bit-error rate of single-photon pulses, and then deduce a more accurate value of the key generation rate. The final key rate over transmission distance is simulated, which shows that we can obtain a higher key rate than that of the existing methods, including our own earlier work.
PACS: 03.67.Dd – Quantum cryptography / 42.65.Lm – Parametric down conversion and production of entangled photons / 03.67.Hk – Quantum communication
© Europhysics Letters Association, 2007
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