The superconducting nanowire single-photon detector (SNSPD) is a quantum-limit
superconducting optical detector based on the Cooper-pair breaking effect by a single …

Single-photon detectors (SPDs) are the most sensitive instruments for light detection. In the
near-infrared range, SPDs based on III–V compound semiconductor avalanche photodiodes …

Quantum key distribution (QKD), has the potential to enable secure communication and
information transfer. In the laboratory, the feasibility of point-to-point QKD is evident from the …

Quantum secure direct communication (QSDC) based on entanglement can directly transmit
confidential information. However, the inability to simultaneously distinguish the four sets of …

In the past, long-distance free-space quantum communication experiments could only be
implemented at night. During the daytime, the bright background sunlight prohibits quantum …

Quantum key distribution (QKD) enables participants to exchange secret information over
long distances with unconditional security. However, the performance of today's QKD …

In quantum key distribution (QKD), the bit error rate is used to estimate the information
leakage and hence determines the amount of privacy amplification—making the final key …

Entanglement is a vital resource for realizing many tasks such as teleportation, secure key
distribution, metrology, and quantum computations. To effectively build entanglement …

High complexity, dense integrated nanophotonic circuits possessing strong non-linearities
are desirable for a breadth of applications in classical and quantum optics. In this work, we …

A micro-pulse lidar at eye-safe wavelength is constructed based on an upconversion single-
photon detector. The ultralow-noise detector enables using integration technique to improve …