Unconditional privacy over channels which cannot convey quantum information

Abstract

By sending systems in specially prepared quantum states, two parties can communicate without an eavesdropper being able to listen. The technique, called quantum cryptography, enables one to verify that the state of the quantum system has not been tampered with, and thus one can obtain privacy regardless of the power of the eavesdropper. All previous protocols relied on the ability to faithfully send quantum states. In fact, until recently, they could all be reduced to a single protocol where security is ensured though sharing maximally entangled states. Here we show this need not be the case -- one can obtain verifiable privacy even through some channels which cannot be used to reliably send quantum states.

Related to quant-ph/0608195 and for a more general audience

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Cited by in corpus (25)

• Quantum entanglement
• The Security of Practical Quantum Key Distribution
• Secure quantum key distribution with realistic devices
• Quantum channels and their entropic characteristics
• Converse bounds for private communication over quantum channels
• General paradigm for distilling classical key from quantum states
• A Generalization of Quantum Stein's Lemma
• A few steps more towards NPT bound entanglement
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• Energy-constrained private and quantum capacities of quantum channels
• Multipartite secret key distillation and bound entanglement
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• Amortization does not enhance the max-Rains information of a quantum channel
• Capacity estimation and verification of quantum channels with arbitrarily correlated errors
• Upper bounds on device-independent quantum key distribution
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• Refined finite-size analysis of binary-modulation continuous-variable quantum key distribution
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