Quantum Key Distribution Protocols with High Rates and Low Costs
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Security analysis of the time-coding quantum key distribution protocols
We report the security analysis of time-coding quantum key distribution protocols. The protocols make use of coherent single-photon pulses. The key is encoded in the photon time-detection. The use of coherent superposition of states allows to detect eavesdropping of the key. We give a mathematical model of a first protocol from which we derive a second, simpler, protocol. We derive the security...
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The continuous variable quantum key distribution has been considered to have the potential to provide high secret key rate. However, in present experimental demonstrations, the secret key can be distilled only under very small loss rates. Here, by calculating explicitly the computational complexity with the channel transmission, we show that under high loss rate it is hard to distill the secret...
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Quantum key distribution (QKD) [1] has been the most studied quantum information technology primitive for the past twenty years. In a practical QKD protocol, Alice and Bob can extract an arbitrary amount of secret key using an untrusted physical channel (also called a quantum channel), provided a few minimum assumptions such as they have access to a public authenticated channel. Contrary to cla...
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