Measurement-device-independent quantum key distribution.
The results show that long-distance quantum cryptography over say 200 km will remain secure even with seriously flawed detectors, and the key generation rate is many orders of magnitude higher than that based on full device independent QKD.
Practical Decoy State for Quantum Key Distribution
It is suggested that, even for long-distance QKD, the two-decoy-state protocol can be implemented with only a few hours of experimental data, and the decoy state quantum key distribution is highly practical.
Time-shift attack in practical quantum cryptosystems
- B. Qi, C. Fung, H. Lo, Xiongfeng Ma
- Computer ScienceQuantum information & computation
- 10 December 2005
This paper proposes another "time-shift" attack that exploits the efficiency mismatch of two single photon detectors in a quantum key distribution (QKD) system and proves that if Alice and Bob are unaware of the attack, the final key they share is insecure.
Quantum random number generation
Self-testing quantum random number generators (QRNGs) are studied, in which verifiable randomness can be generated without trusting the actual implementation, and an intermediate category is self-testing QRNG, which provides a tradeoff between the trustworthiness on the device and the random number generation speed.
Experimental quantum key distribution with decoy states.
- Yi Zhao, B. Qi, Xiongfeng Ma, H. Lo, L. Qian
- Computer Science, PhysicsPhysical Review Letters
- 24 March 2005
By making simple modifications to a commercial quantum key distribution system, it is shown that a secure key generation rate of 165 bit/s, which is 1/4 of the theoretical limit, can be obtained over 15 km of a telecommunication fiber.
Practical challenges in quantum key distribution
Before QKD can be widely adopted, it faces a number of important challenges such as secret key rate, distance, size, cost and practical security, according to a survey of key challenges.
High-speed quantum random number generation by measuring phase noise of a single-mode laser.
A high-speed random number generation scheme based on measuring the quantum phase noise of a single-mode laser operating at a low intensity level near the lasing threshold is presented and the generated random numbers have passed all the DIEHARD tests.
Postprocessing for quantum random number generators: entropy evaluation and randomness extraction
This work proposes a generic framework for evaluating quantum randomness of real-life QRNGs by min-entropy, and applies it to two different existing quantum random-number systems in the literature.
Generating the local oscillator "locally" in continuous-variable quantum key distribution based on coherent detection
A pilot-aided feedforward data recovery scheme which enables reliable coherent detection using a "locally" generated LO and the variance of the phase noise introduced by the proposed scheme is measured to be 0.04, which is small enough to enable secure key distribution.
A balanced homodyne detector for high-rate Gaussian-modulated coherent-state quantum key distribution
We discuss the excess noise contributions of a practical balanced homodyne detector (BHD) in Gaussian-modulated coherent-state (GMCS) quantum key distribution (QKD). We point out that the key…