### Prof. Pérola Milman

Pérola Milman is a senior CNRS researcher who is part of the QITE team (Quantum Information and Technologies) at Laboratoire Matériaux et Phénomènes Quantiques, Paris. Her fields of expertise are quantum optics, quantum continuous variables, fundamental aspects of quantum mechanics and the study of decoherence, its effects and causes, and ways to protect quantum systems from it. Her research is mainly focused on theoretical aspects with close connection with experimental devices, and she teaches Quantum Computing for Physicists in the Master 2 program Quantum Devices and Nanotechnologies at University of Paris.

#### The Hong-Ou-Mandel experiment and its multiple facets : from indistinguishability to quantum information with continuous variables.

Light is made of photons, indistinguishable and indivisible particles associated to clicks in experiments. A foundational experiment in quantum optics is known as the Hong-Ou-Mandel experiment, after their authors. It consists of a two-photon interference experiment based on coincidence measurements that showed, in 1987, that photons are indistinguishable and bunch. Since then, this experiment has been reviewed and revisited in many ways, and was used, for instance, to detect particle entanglement between photon pairs, or entanglement in different photonic degrees of freedom (examples are frequency and the transverse position and momentum), to characterize the photonic Wigner function, for quantum simulation using photons and to implement quantum error correction. There is no reason to believe that the list of applications of such a versatile interferometer is over. In my lectures I’ll describe the Hong-Ou-Mandel experiment and show how it can be used as an essential tool in quantum information and protocols with continuous variables encoded in continuous degrees of freedoms of individual photons. I’ll provide the essential ingredients of continuous variables quantum computation and error correction and provide an overview of how single photons can be used to encode this type of information.