Sending-or-not-sending twin-field quantum key distribution: Breaking the direct transmission key rate

Sending entanglement through noisy quantum channels.

This paper addresses some general questions of quantum information theory arising from the transmission of quantum entanglement through (possibly noisy) quantum channels. A pure entangled state is prepared of a pair of systems R and Q, after which Q is subjected to a dynamical evolution given by the superoperator $. Two interesting quantities can be defined for this process: the entanglement fi...

Breaking The One-Third Bit Error Rate Barrier Of Quantum Key Distribution

To push up the error tolerance rate of quantum key distribution, I propose a prepare-and-measure quantum key distribution scheme using N -dimensional quantum particles as information carriers where N is a prime power. Remarkably, this prepare-and-measure scheme can distribute a provably secure key against all attacks allowed by the laws of quantum physics for at least one-third bit error rate w...

Quantum-locked key distribution at nearly the classical capacity rate.

Quantum data locking is a protocol that allows for a small secret key to (un)lock an exponentially larger amount of information, hence yielding the strongest violation of the classical one-time pad encryption in the quantum setting. This violation mirrors a large gap existing between two security criteria for quantum cryptography quantified by two entropic quantities: the Holevo information and...

Sending signals dynamically.

Proteins mediate transmission of signals along intercellular and intracellular pathways and between the exterior and the interior of a cell. The dynamic properties of signaling proteins are crucial to their functions. We discuss emerging paradigms for the role of protein dynamics in signaling. A central tenet is that proteins fluctuate among many states on evolutionarily selected energy landsca...

Quantum Key Distribution