With the development of photonic quantum technologies, single photons have become key
for various applications including quantum communication and quantum computing …

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] …

Quantum computers are unnecessary for exponentially efficient computation or simulation if
the Extended Church-Turing thesis is correct. The thesis would be strongly contradicted by …

Photon-number-resolving detectors are needed for a variety of applications including linear-
optics quantum computing. Here we describe the use of time-multiplexing techniques that …

Large-photon-number path entanglement is an important resource for enhanced precision
measurements and quantum imaging. We present a general constructive protocol to create …

Detectors that can resolve photon number are needed in many quantum information
technologies. In order to be useful in quantum information processing, such detectors should …

Although universal continuous-variable quantum computation cannot be achieved via linear
optics (including squeezing), homodyne detection, and feed-forward, inclusion of ideal …

A photon-number-resolving detector based on a four-element superconducting nanowire
single photon detector is demonstrated to have sub-30-ps resolution in measuring the arrival …

Optical quantum-nondemolition devices can provide essential tools for quantum information
processing. Here, we describe several optical interferometers that signal the presence of a …

We introduce an architecture for robust and scalable quantum computation using both
stationary qubits (eg, single photon sources made out of trapped atoms, molecules, ions …