A quantum internet is the holy grail of quantum information processing, enabling the
deployment of a broad range of quantum technologies and protocols on a global scale …

Quantum light–matter interfaces are at the heart of photonic quantum technologies.
Quantum memories for photons, where non-classical states of photons are mapped onto …

Linear optics with photon counting is a prominent candidate for practical quantum
computing. The protocol by Knill, Laflamme, and Milburn [2001, Nature (London) 409, 46] …

In 2001, all-optical quantum computing became feasible with the discovery that scalable
quantum computing is possible using only single-photon sources, linear optical elements …

It is impossible to unambiguously distinguish the four Bell states in polarization, resorting to
linear optical elements only. Recently, the hyperentangled Bell state, the simultaneous …

Entanglement purification is a very important element for long-distance quantum
communication. Different from all the existing entanglement purification protocols (EPPs) in …

We present a review of theoretical and experimental aspects of multiphoton quantum optics.
Multiphoton processes occur and are important for many aspects of matter–radiation …

We present a way for entanglement purification based on two parametric down-conversion
(PDC) sources with cross-Kerr nonlinearities. It is comprised of two processes. The first one …

We present two realistic entanglement concentration protocols (ECPs) for pure partially
entangled photons. A partially entangled photon pair can be concentrated to a maximally …

We present a scheme for linear optical quantum computation that is highly robust to
imperfect single photon sources and inefficient detectors. In particular we show that if the …