Improved practical decoy state method in quantum key distribution with parametric down conversion source

Abstract

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 quantum bit-error rate of single-photon, and then deduce a more accurate value of 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.

8 pages, 3 figures

References in corpus (3)

• Quantum key distribution over 122 km of standard telecom fiber
• High quality asynchronous heralded single photon source at telecom wavelength
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Cited by in corpus (6)

• Quantum key distribution with entangled photon sources
• General theory of decoy-state quantum cryptography with source errors
• Quantum key distribution with triggering parametric down conversion sources
• Decoy State Quantum Key Distribution With Modified Coherent State
• Decoy states for quantum key distribution based on decoherence-free subspaces
• Quantum cryptography: theory and practice