Multimode quantum optics

Femto Lab and Optical Fiber Networks

Quantum Optics, as the child of Optics and Quantum Mechanics, has inherited a double linearity: that of Maxwell equations, which use optical modes as a basis of solutions, and that of the Schrödinger equation, which uses quantum state bases. Considering these two bases on an equal footing and tailoring quantum fields not only in given modes, but also optimizing the spatio-temporal shapes of the modes in which the state is defined, opens wide perspectives for treating complex quantum states. Our aim is to explore and characterize theoretically the quantum states that span on many optical modes (from several tens to several thousands) and many Hilbert space basis states, to unravel their intrinsic properties and to find optimized witnesses of different properties such as multi-entanglement. We also investigate the use of optimized multimode states for pushing the quantum limits of the multiplexed estimation of physical parameters and for increasing the channel capacity of optical communications.

 

Femto Lab

Optical Fiber Networks

img_5328

Femto Lab

TEAM MEMBERS

PERMANENT STAFF

  • Claude Fabre
  • Nicolas Treps
  • Valentina Parigi

POSTDOC

  • Young Sik Ra
  • Syamsundar De
  • Mattia Walschaers

PHD STUDENT

  • Clément Jacquard
  • Francesco Arzani
  • Adrien Dufour
  • Luca La Volpe

Femtosecond Quantum Optics

Ultrafast frequency combs have found tremendous utility as precision instruments in domains ranging from frequency metrology, optical clocks, broadband spectroscopy, and absolute distance measurement. This sensitivity originates from the fact that a comb carries a huge number of co- propagating, coherently-locked frequency modes and ultrafast optics with coherent control techniques became a flourishing field over the last decades. Likewise, exploiting the quantum features of light has enabled remarkable progress for the experimental exploration of fundamental physics and has been central to the establishment of the fields of quantum communication and quantum metrology. The global objective of this research line is to bring together these two vibrant fields with the goal of exploring new capabilities that arise from the interplay of the quantum properties of light at extreme timescales and over extremely broad spectra.

The Femto Lab Team works on 4 main projects :lowres-1

Optical Fiber Networks

TEAM MEMBERS

PERMANENT STAFF

  • Claude Fabre
  • Nicolas Treps

 

PHD STUDENT

  • Pauline Boucher

Exploiting the spatial degrees of freedom of light one can increase information capacity, both at the classical and the quantum level. In a bottom up approach, one can use single mode optical fibres, and build a network around them. This necessitates quantum or classical states directly and efficiently coupled into single mode fibres. Unitary transformation on the spatial degree of freedom of light have to be implemented. Beyond using this approach to study quantum complex networks or multimode amplification in optical fibres, the group has transferred the technologies to a start up company.

CAILabs is a French venture-backed optics start-up founded in 2013 by three PhDs in physics, Jean-François Morizur, Guillaume Labroille and Nicolas Treps. At the core of CAILabs lies a new technique to manipulate the spatial shape of light, first developed for quantum optics purpose at the Laboratoire Kastler Brossel. Using this technology, CAILabs aims at solving light shaping problems, in fields such as spatial multiplexing for telecommunications and industrial laser processes, by providing efficient and flexible light converters.

spip.php

http://www.cailabs.com/