Security Aspects of Practical Quantum Cryptography

Details Security Aspects of Practical Quantum Cryptography Security Aspects of Practical Quantum Cryptography

1999-11-12

arxiv.org/abs/quant-ph/9911054v1

Phys. Rev. Lett. Vol 85, 1330-1333 (2000).

Physics

Quantum Physics

5 pages, uses multicol

Scientific paper

10.1103/PhysRevLett.85.1330

The use of quantum bits (qubits) in cryptography holds the promise of secure cryptographic quantum key distribution schemes. Unfortunately, the implemented schemes can be totally insecure. We provide a thorough investigation of security issues for practical quantum key distribution, taking into account channel losses, a realistic detection process, and modifications of the ``qubits'' sent from the sender to the receiver. We first show that even quantum key distribution with perfect qubits cannot be achieved over long distances when fixed channel losses and fixed dark count errors are taken into account. Then we show that existing experimental schemes (based on ``weak-pulse'') are usually totally insecure. Finally we show that parametric downconversion offers enhanced performance compared to its weak coherent pulse counterpart.

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