The quantum cryptographic switch

Abstract

We illustrate using a quantum system the principle of a cryptographic switch, in which a third party (Charlie) can control to a continuously varying degree the amount of information the receiver (Bob) receives, after the sender (Alice) has sent her information. Suppose Charlie transmits a Bell state to Alice and Bob. Alice uses dense coding to transmit two bits to Bob. Only if the 2-bit information corresponding to choice of Bell state is made available by Charlie to Bob can the latter recover Alice's information. By varying the information he gives, Charlie can continuously vary the information recovered by Bob. The performance of the protocol subjected to the squeezed generalized amplitude damping channel is considered. We also present a number of practical situations where a cryptographic switch would be of use.

7 pages, 4 Figures

References in corpus (5)

• Secure Direct Communication Based on Secret Transmitting Order of Particles
• The squeezed generalized amplitude damping channel
• Anonymous quantum communication
• Deterministic secure quantum communication without maximally entangled states
• Probabilistic Secret Sharing Through Noisy Quantum Channels

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