Interactions between light and matter play an instrumental role in spectroscopy, sensing,
quantum information processing and lasers. In most of these applications, light is considered …

Quantum metrology provides a route to overcome practical limits in sensing devices. It holds
particular relevance to biology, where sensitivity and resolution constraints restrict …

The past decade has seen a dramatic increase in interest in new single-photon detector
technologies. A major cause of this trend has undoubtedly been the push towards optical …

Multiphoton interference reveals strictly nonclassical phenomena. Its applications range
from fundamental tests of quantum mechanics to photonic quantum information processing …

Optical-to-electrical conversion, which is the basis of the operation of optical detectors, can
be linear or nonlinear. When high sensitivities are needed, single-photon detectors are …

We present generation of photon-subtracted squeezed states at 860 nm, from nearly pure,
continuous-wave squeezed vacua generated with a periodically-poled KTiOPO_4 crystal as …

To describe certain facets of nonclassicality, it is necessary to quantify properties of
operations instead of states. This is the case if one wants to quantify how well an operation …

The quantization of the electromagnetic field leads directly to the existence of quantum
mechanical states, called Fock states, with an exact integer number of photons. Despite …

We derive a closed photocounting formula, including noise counts and a finite quantum
efficiency, for photon-number-resolving detectors based on on-off detectors. It applies to …

Efficient and precise photon-number-resolving detectors are essential for optical quantum
information science. Despite this, very few detectors have been able to distinguish photon …