Quantum cryptography is arguably the fastest growing area in quantum information science.
Novel theoretical protocols are designed on a regular basis, security proofs are constantly …

Concerted efforts are underway to establish an infrastructure for a global quantum Internet to
realise a spectrum of quantum technologies. This will enable more precise sensors, secure …

Quantum key distribution (QKD) is a family of protocols for growing a private encryption key
between two parties. Despite much progress, all ground-based QKD approaches have a …

Quantum secure direct communication (QSDC) leverages quantum states to transmit
information securely and reliably over a noisy, lossy, and wiretapped quantum channel. It …

Single-photon detection with high efficiency, high time resolution, low dark counts, and high
photon detection rates is crucial for a wide range of optical measurements. Although efficient …

Long-distance quantum state transfer (QST), which can be achieved with the help of
quantum teleportation, is a core element of important quantum protocols. A typical situation …

Entanglement distribution via photons over long distances enables many applications,
including quantum key distribution, which provides unprecedented privacy. The inevitable …

Quantum entanglement is a fundamental resource in quantum information processing and
its distribution between distant parties is a key challenge in quantum communications …

One drawback of conventional quantum state tomography is that it does not readily provide
access to single density matrix elements since it requires a global reconstruction. Here, we …

Quantum communication is a prime space technology application and offers near-term
possibilities for long-distance quantum key distribution (QKD) and experimental tests of …