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 …

Research in quantum information processing has followed two different directions: the use of
discrete variables (qubits) and that of high-dimensional, continuous-variable Gaussian …

Gaussian states have played an important role in the physics of continuous-variable
quantum systems. They are appealing for the experimental ease with which they can be …

Conventional spectroscopy uses classical light to detect matter properties through the
variation of its response with frequencies or time delays. Quantum light opens up new …

We derive a bound on the ability of a linear-optical network to estimate a linear combination
of independent phase shifts by using an arbitrary nonclassical but unentangled input state …

Spontaneous parametric down-conversion (SPDC) has been a key enabling technology in
exploring quantum phenomena and their applications for decades. For instance, traditional …

The basic idea of squeezing can be understood by considering the quantum harmonic
oscillator, familiar from undergraduate quantum mechanics. Squeezing is best visualized by …

It is a long-standing goal to create light with unique quantum properties such as squeezing
and entanglement. We propose the generation of quantum light using free-electron …

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 …

This review covers recent theoretical and experimental efforts to extend the application of
the continuous-variable quantum technology of light beyond" Gaussian" quantum states …