Highly-efficient quantum memory for polarization qubits in a spatially-multiplexed cold atomic ensemble
Nature Com. 9, 363 (2018)

Slowing quantum decoherence by squeezing in phase space
Phys. Rev. Lett. 120, 073603 (2018) 

Large Bragg reflection from one-dimensional chains of trapped atoms near a nanoscale waveguide
Phys. Rev. Lett. 117, 133603 (2016)

Quantum state engineering with time-separated heraldings from a cw source: a temporal mode analysis
Phys. Rev. A 93, 013838 (2016)

Storage and retrieval of vector beams of light in a multiple-degree of-freedom quantum memory
Nature Com. 6, 7706 (2015)

Optical synthesis of large-amplitude squeezed coherent-state superpositions with minimal resources
Phys. Rev. Lett. 115, 023602 (2015)



The team focuses on experimental and theoretical researches to develop the scientific and technical abilities for the realization of quantum networks, with applications to the distribution and processing of quantum information. These works include the development of light-matter interfaces for quantum data storage, the generation, characterization and manipulation of various non-classical states of light, and the implementation of networking protocols using these resources.This research involves fundamental and more applied studies in quantum optics, light-matter interaction, non-linear optics, photon detection and nanophotonics.

Interested in quantum optics and quantum information science? We are always happy to welcome motivated undergraduates, PhD students and Postdocs. Contact Prof. Laurat for openings.

We are part of PCQC, the Paris Center for Quantum Computing, and member of the DIM NanoK Ile-de-France .



The team has recently managed to store light that propagates in an optical fiber and to release it later on demand. By causing interaction between the traveling light and a few thousand atoms in the vicinity, we demonstrated an all-fibered memory. At the core of the device is a fiber with a short section elongated to 400 nm in diameter where the light can efficiently interact with a cloud of laser-cooled atoms. Using the so-called electromagnetically induced transparency technique, well-known in free space but combined for the first time with a fiber, we slowed down the light by 3000-fold and then halted it completely. Later, the light was released into the fiber, reconstituting the initial encoded information that can once again travel. All that was performed at the single photon level with a signal to noise ratio above 20 !

This work was published in Physical Review Letters and selected as PRL Editors suggestions. Covered also by APS-Physics and PhysicsWorld. Selected by OSA Optics and Photonics News in Optics in 2015


June 14, 2018 – A News and Views written by Julien about two papers "Entanglement on demand" ! Congrats to Ronald's  and Andreas' team !

Feb. 13, 2018 – Our PRL on slowing decoherence by squeezing in online. Congrats to the team and thank you Radim for the collaboration. Squeeeeeze!!

Jan. 25, 2018 – Our Nature Communications on highly efficient quantum memory is published! See the Press release and the Story

Sept. 25, 2017 – Julien is in Seefeld: Quantum networks brainstorming!

Sept. 23, 2016 – Our PRL on Bragg reflection with 2000 atoms is published. Featured nicely in a Focus by Physics!

Jun. 27, 2016 – Julien is giving an invited talk at CEWQO, at OAC.

Apr. 18, 2016 – Julien is visiting Furusawa's lab for one week. 

Apr. 8, 2016 – Our nanofiber memory featured in OPN this month: A Photonic Upgrade for Computer Memory.