Reliable long-distance distribution of entanglement is a key technique for many quantum
applications, most notably quantum key distribution. Here, we present a continuously …

Digital payments have replaced physical banknotes in many aspects of our daily lives.
Similarly to banknotes, they should be easy to use, unique, tamper-resistant and …

Frequency encoding is quickly becoming an attractive prospect for quantum information
protocols owing to larger Hilbert spaces and increased resilience to noise compared to other …

Precision interferometry with quantum states has emerged as an essential tool for
experimentally answering fundamental questions in physics. Optical quantum …

The rising demand for transmission capacity in optical networks has motivated steady
interest in expansion beyond the standard C-band (1530–1565 nm) into the adjacent L …

Entanglement is a universal resource in quantum networks, yet entangled photon sources
are typically custom-made for a specific use case. Versatility, both in terms of state …

Integrated microresonator facilitates the realization of quantum frequency comb (QFC),
which provides a large number of discrete frequency modes with broadband spectral range …

Photon loss is the fundamental issue toward the development of quantum networks. To
circumvent loss quantum repeaters were proposed, which need high-performance quantum …

We present a field-deployed quantum key distribution (QKD) link based on energy-time
entanglement. Three nodes are connected, bridging the cities of Nice and Sophia Antipolis …

Quantum steering, entanglement, and discord often deal with different relativistic quantum
information tasks. It is necessary, therefore, to classify different hierarchies of quantum …