Optical photons are powerful carriers of quantum information, which can be delivered in free
space by satellites or in fibers on the ground over long distances. Entanglement of quantum …

Device-independent quantum key distribution (DI-QKD) provides the gold standard for
secure key exchange. Not only does it allow for information-theoretic security based on …

The central technological appeal of quantum science resides in exploiting quantum effects,
such as entanglement, for a variety of applications, including computing, communication and …

Device-independent quantum key distribution (DIQKD) enables the generation of secret
keys over an untrusted channel using uncharacterized and potentially untrusted devices …

Cryptographic key exchange protocols traditionally rely on computational conjectures such
as the hardness of prime factorization to provide security against eavesdropping attacks …

We report on an elementary quantum network of two atomic ions separated by 230 m. The
ions are trapped in different buildings and connected with 520 (2) m of optical fiber. At each …

Long-distance quantum communication and networking require quantum memory nodes
with efficient optical interfaces and long memory times. We report the realization of an …

A quantum repeater node is presented based on trapped ions that act as single-photon
emitters, quantum memories, and an elementary quantum processor. The node's ability to …

Group-IV color centers in diamond are a promising light-matter interface for quantum
networking devices. The negatively charged tin-vacancy center (Sn V) is particularly …

An efficient, scalable source of shaped single photons that can be directly integrated with
optical fiber networks and quantum memories is at the heart of many protocols in quantum …