Single photons are a fundamental element of most quantum optical technologies. The ideal
single-photon source is an on-demand, deterministic, single-photon source delivering light …

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 teleportation provides a 'disembodied'way to transfer quantum states from one
object to another at a distant location, assisted by previously shared entangled states and a …

Quantum cryptography Page 1 Quantum cryptography Nicolas Gisin, Grégoire Ribordy,
Wolfgang Tittel, and Hugo Zbinden Group of Applied Physics, University of Geneva, 1211 …

Recent developments in quantum photonics have initiated the process of bringing photonic-
quantumbased systems out-of-the-lab and into real-world applications. As an example …

We present a source of entangled photons that violates a Bell inequality free of the “fair-
sampling” assumption, by over 7 standard deviations. This violation is the first reported …

Entangled photon-pair sources are at the core of quantum applications like quantum key
distribution, sensing, and imaging. Operation in space-limited and adverse environments …

We describe in detail the theory underpinning the measurement of density matrices of a pair
of quantum two-level systems (“qubits”). Our particular emphasis is on qubits realized by the …

We review the main works in the field of nonlinear interferometers, which has been
developing ever since the start of nonlinear optics and has seen growing interest in recent …

Many quantum photonic technologies require the efficient generation of entangled pairs of
photons, but to date there have been few ways to produce them reliably. Sources based on …