Key Disclosing in Multiphotons with Quantum Cloning
arXiv:quant-ph/0305136
Abstract
Multiphoton state in quantum cryptography decreases its security. Key disclosing with universal quantum cloning machine (UQCM) is considered in explicit manner. Although UQCM cannot make perfect clones, there is some invariant quantity between the original photon and the imperfect clones. The invariant quantity, the direction of Stokes parameters, tells us the auxiliary information leading into key information. The attack, then, corresponds to some kind of quantum non-demolition measurement. Its application to recent high-performance quantum cryptography, Y-00 protocol, is also studied.
RevTeX, 6 pages, 4figures, The layout of the figures are changed
References in corpus (12)
- Quantum Cryptography
- Simple Proof of Security of the BB84 Quantum Key Distribution Protocol
- Quantum Copying: Beyond the No-Cloning Theorem
- Security against individual attacks for realistic quantum key distribution
- Optimal Quantum Cloning Machines
- Quantum Key Distribution over 67 km with a plug & play system
- Secure communication using mesoscopic coherent states
- Unconditionally Secure Key Distribution Based on Two Nonorthogonal States
- Unconditional security in Quantum Cryptography
- Fast and secure key distribution using mesoscopic coherent states of light
- Secure communication using coherent states
- Experimental study for Yuen-Kim protocol of quantum key distribution with unconditional secure