Alain Aspect
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View article: Classical and quantum trampoline for ultra-cold atoms, in Quantum phenomena in gravitational field
Classical and quantum trampoline for ultra-cold atoms, in Quantum phenomena in gravitational field Open
The subjects presented here are very different. Their common feature is that they all involve quantum phenomena in a gravitational field: gravitational quantum states of ultracold antihydrogen above a material surface and measuring a gravi…
View article: Erratum: Momentum-Resolved Observation of Thermal and Quantum Depletion in a Bose Gas [Phys. Rev. Lett. <b>117</b>, 235303 (2016)]
Erratum: Momentum-Resolved Observation of Thermal and Quantum Depletion in a Bose Gas [Phys. Rev. Lett. <b>117</b>, 235303 (2016)] Open
This corrects the article DOI: 10.1103/PhysRevLett.117.235303.
View article: Full counting statistics of interacting lattice gases after an expansion: The role of condensate depletion in many-body coherence
Full counting statistics of interacting lattice gases after an expansion: The role of condensate depletion in many-body coherence Open
We study the full counting statistics (FCS) of quantum gases in samples of thousands of interacting bosons, detected atom by atom after a long free-fall expansion. In this far-field configuration, the FCS reveals the many-body coherence fr…
View article: Full counting statistics of interacting lattice gases after an expansion: The role of the condensate depletion in the many-body coherence
Full counting statistics of interacting lattice gases after an expansion: The role of the condensate depletion in the many-body coherence Open
We study the full counting statistics (FCS) of quantum gases in samples of thousands of interacting bosons, detected atom-by-atom after a long free-fall expansion. In this far-field configuration, the FCS reveals the many-body coherence fr…
View article: Observation of $1/k^4$-tails after expansion of Bose-Einstein Condensates with impurities
Observation of $1/k^4$-tails after expansion of Bose-Einstein Condensates with impurities Open
We measure the momentum density in a Bose-Einstein condensate (BEC) with dilute spin impurities after an expansion in the presence of interactions. We observe tails decaying as $1/k^4$ at large momentum $k$ in the condensate and in the imp…
View article: Spectral functions and localization-landscape theory in speckle potentials
Spectral functions and localization-landscape theory in speckle potentials Open
Spectral function is a key tool for understanding the behavior of\nBose-Einstein condensates of cold atoms in random potentials generated by a\nlaser speckle. In this paper we introduce a new method for computing the\nspectral functions in…
View article: Spectral functions and localization landscape theory in speckle potentials
Spectral functions and localization landscape theory in speckle potentials Open
Spectral function is a key tool for understanding the behavior of Bose-Einstein condensates of cold atoms in random potentials generated by a laser speckle. In this paper we introduce a new method for computing the spectral functions in di…
View article: Single photon wavefront-splitting interference: An illustration of the light quantum in action
Single photon wavefront-splitting interference: An illustration of the light quantum in action Open
We present a new realization of the textbook experiment consisting in single-photon interference based on the pulsed, optically excited photoluminescence of a single colour centre in a diamond nanocrystal. Interferences are created by wave…
View article: Hanbury Brown and Twiss Bunching of Phonons and of the Quantum Depletion in an Interacting Bose Gas
Hanbury Brown and Twiss Bunching of Phonons and of the Quantum Depletion in an Interacting Bose Gas Open
We report the realization of a Hanbury Brown and Twiss (HBT)-like experiment with a gas of interacting bosons at low temperatures. The low-temperature regime is reached in a three-dimensional optical lattice and atom-atom correlations are …
View article: Hanburry Brown and Twiss, Hong Ou and Mandel effects and other landmarks in Quantum Optics: from photons to atoms
Hanburry Brown and Twiss, Hong Ou and Mandel effects and other landmarks in Quantum Optics: from photons to atoms Open
In this lecture, I first present my views on the second vs the first quantum revolution, then describe the Hanbury Brown and Twiss effect with photons, and indicate why it was so important in the development of modern quantum optics. The p…
View article: Momentum-Space Atom Correlations in a Mott Insulator
Momentum-Space Atom Correlations in a Mott Insulator Open
We report on the investigation of the three-dimensional single-atom-resolved distributions of bosonic Mott insulators in momentum-space. Firstly, we measure the two-body and three-body correlations deep in the Mott regime, finding a perfec…
View article: Thermal counting statistics in an atomic two-mode squeezed vacuum state
Thermal counting statistics in an atomic two-mode squeezed vacuum state Open
We measure the population distribution in one of the atomic twin beams generated by four-wave mixing in an optical lattice. Although the produced two-mode squeezed vacuum state is pure, each individual mode is described as a statistical mi…
View article: Report on 1904.04135v1
Report on 1904.04135v1 Open
We measure the population distribution in one of the atomic twin beams generated by four-wave mixing in an optical lattice.Although the produced two-mode squeezed state is pure, each individual mode is described as a statistical mixture.We…
View article: Report on 1904.04135v1
Report on 1904.04135v1 Open
We measure the population distribution in one of the atomic twin beams generated by four-wave mixing in an optical lattice.Although the produced two-mode squeezed state is pure, each individual mode is described as a statistical mixture.We…
View article: Elastic Scattering Time of Matter Waves in Disordered Potentials
Elastic Scattering Time of Matter Waves in Disordered Potentials Open
We report on an extensive study of the elastic scattering time τ_{s} of matter waves in optical disordered potentials. Using direct experimental measurements, numerical simulations, and comparison with the first-order Born approximation ba…
View article: Hanbury Brown and Twiss, Hong Ou and Mandel and other landmarks in quantum optics: from photons to atoms
Hanbury Brown and Twiss, Hong Ou and Mandel and other landmarks in quantum optics: from photons to atoms Open
International audience
View article: Measurement of Spectral Functions of Ultracold Atoms in Disordered Potentials
Measurement of Spectral Functions of Ultracold Atoms in Disordered Potentials Open
We report on the measurement of the spectral functions of noninteracting ultracold atoms in a three-dimensional disordered potential resulting from an optical speckle field. Varying the disorder strength by 2 orders of magnitude, we observ…
View article: Expansion of a quantum wave packet in a one-dimensional disordered potential in the presence of a uniform bias force
Expansion of a quantum wave packet in a one-dimensional disordered potential in the presence of a uniform bias force Open
International audience
View article: Two-Particle Four-Mode Interferometer for Atoms (poster)
Two-Particle Four-Mode Interferometer for Atoms (poster) Open
International audience
View article: Two-Particle Four-Mode Interferometer for Atoms
Two-Particle Four-Mode Interferometer for Atoms Open
We present a free-space interferometer to observe two-particle interference of a pair of atoms with entangled momenta. The source of atom pairs is a Bose-Einstein condensate subject to a dynamical instability, and the interferometer is rea…
View article: Effect of a bias field on disordered waveguides: Universal scaling of conductance and application to ultracold atoms
Effect of a bias field on disordered waveguides: Universal scaling of conductance and application to ultracold atoms Open
We study the transmission of a disordered waveguide subjected to a finite\nbias field. The statisticaldistribution of transmission is analytically shown\nto take a universal form. It depends on a singleparameter, the system length\nexpress…
View article: Nonlinear scattering of atomic bright solitons in disorder
Nonlinear scattering of atomic bright solitons in disorder Open
We observe nonlinear scattering of 39 K atomic bright solitons launched in a\none-dimensional (1D) speckle disorder. We directly compare it with the\nscattering of non-interacting particles in the same disorder. The atoms in the\nsoliton t…
View article: Momentum-Resolved Observation of Thermal and Quantum Depletion in a Bose Gas
Momentum-Resolved Observation of Thermal and Quantum Depletion in a Bose Gas Open
We report on the single-atom-resolved measurement of the distribution of momenta ℏk in a weakly interacting Bose gas after a 330 ms time of flight. We investigate it for various temperatures and clearly separate two contributions to the de…
View article: Production of strongly bound 39K bright solitons
Production of strongly bound 39K bright solitons Open
We report on the production of 39 K matter-wave bright solitons, i.e., 1D matter-waves that propagate without dispersion thanks to attractive interactions. The volume of the soliton is studied as a function of the scattering length through…
View article: Momentum-resolved observation of quantum depletion in an interacting Bose gas
Momentum-resolved observation of quantum depletion in an interacting Bose gas Open
We report on the single-atom-resolved measurement of the distribution of momenta $\hbar k$ in a weakly interacting Bose gas after a 330 ms time-of-flight. We investigate it for various temperatures and clearly separate two contributions to…
View article: Closing the Door on Einstein and Bohr’s Quantum Debate
Closing the Door on Einstein and Bohr’s Quantum Debate Open
By closing two loopholes at once, three experimental tests of Bell's inequalities remove the last doubts that we should renounce local realism. They also open the door to new quantum information technologies.
View article: Suppression and Revival of Weak Localization through Control of Time-Reversal Symmetry
Suppression and Revival of Weak Localization through Control of Time-Reversal Symmetry Open
We report on the observation of suppression and revival of coherent backscattering of ultracold atoms launched in an optical disorder in a quasi-2D geometry and submitted to a short dephasing pulse, as proposed by Micklitz, Müller, and Alt…