Practical security analysis of two-way quantum key distribution protocols based on non-orthogonal states

Abstract

Within the broad research scenario of quantum secure communication, Two-Way Quantum Key Distribution (TWQKD) is a relatively new proposal for sharing secret keys that is not fully explored yet. We analyse the security of TWQKD schemes that use qubits prepared in non-orthogonal states to transmit the key. Investigating protocols that employ an arbitrary number of bases for the channel preparation, we show, in particular, that the security of the LM05 protocol can not be improved by the use of more than two preparation bases. We also provide a new proof of unconditional security for a deterministic TWQKD protocol recently proposed [Phys. Rev. A 88, 062302 (2013)]. In addition, we introduce a novel deterministic protocol named TWQKD six-state and compute an analytical lower bound (which can be tightened) for the maximum amount of information that an eavesdropper could extract in this case. An interesting advantage of our approach to the security analysis of TWQKD is the great simplicity and transparency of the derivations.

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• Distillation of secret key and entanglement from quantum states
• Fully device independent quantum key distribution
• Gigahertz decoy quantum key distribution with 1 Mbit/s secure key rate
• Security of two-way quantum key distribution
• Experimental Test of Two-way Quantum Key Distribution in Presence of Controlled Noise

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• Loophole-free plug-and-play quantum key distribution
• How Secure Are Two-Way Ping-Pong and LM05 QKD Protocols under a Man-in-the-Middle Attack?
• Can Two-Way Direct Communication Protocols Be Considered Secure?
• Information Disturbance Tradeoff in Bidirectional QKD