A few decades ago, quantum optics stood out as a new domain of physics by exhibiting
states of light with no classical equivalent. The first investigations concerned single photons …

This review covers the latest developments in continuous-variable quantum-state
tomography of optical fields and photons, placing a special emphasis on its practical aspects …

One of the most fundamental quantum states of light is the squeezed vacuum, in which noise
in one of the quadratures is less than the standard quantum noise limit. In nanophotonics, it …

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

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

Broadband multimode squeezers constitute a powerful quantum resource with promising
potential for different applications in quantum information technologies such as information …

We have created heralded coherent-state superpositions (CSSs) by subtracting up to three
photons from a pulse of squeezed vacuum light. To produce such CSSs at a sufficient rate …

We introduce the concept of a quantum pulse gate (QPG), a method for accessing the
intrinsic broadband spectral mode structure of ultrafast quantum states of light. This mode …

The time-frequency degree of freedom is a powerful resource for implementing high-
dimensional quantum information processing. In particular, field-orthogonal pulsed temporal …

We report the realization of a bright ultrafast type II parametric down-conversion source of
twin beams free of any spatiotemporal correlations in a periodically poled KTiOPO 4 (PP …