Volume 79, Number 4, August 2007
|Number of page(s)||5|
|Published online||18 July 2007|
Improved practical decoy state method in quantum key distribution with parametric down-conversion source
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
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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