Quantum key distribution (QKD) allows two remote parties to grow a shared secret key. Its
security is founded on the principles of quantum mechanics, but in reality it significantly …

In this paper, we report on the performance of the SwissQuantum quantum key distribution
(QKD) network. The network was installed in the Geneva metropolitan area and ran for more …

Characterizing the physical channel and calibrating the cryptosystem hardware are
prerequisites for establishing a quantum channel for quantum key distribution (QKD) …

Random numbers are needed in many areas: cryptography, Monte Carlo computation and
simulation, industrial testing and labeling, hazard games, gambling, etc. Our assumption has …

We present an efficient method to extract the amount of true randomness that can be
obtained by a quantum random number generator (QRNG). By repeating the measurements …

We propose a class of attacks on quantum key distribution (QKD) systems where an
eavesdropper actively engineers new loopholes by using damaging laser illumination to …

With the emergence of an information society, the idea of protecting sensitive data is steadily
gaining importance. Conventional encryption methods may not be sufficient to guarantee …

We experimentally demonstrate that a superconducting nanowire single-photon detector is
deterministically controllable by bright illumination. We found that bright light can temporarily …

Semiconductor avalanche photodiodes (APDs) are commonly used for single photon
detection in quantum key distribution. Recently, many attacks using bright illumination have …

Practical quantum communication (QC) protocols are assumed to be secure provided
implemented devices are properly characterized and all known side channels are closed …