2019 |
Amri S., Corgier R., Sugny D., Rasel E. M., Gaaloul N., & Charron E. (2019). Optimal control of the transport of Bose-Einstein condensates with atom chips. Sci. Rep., 9, 5346.
Résumé: Using Optimal Control Theory (OCT), we design fast ramps for the controlled transport of Bose-Einstein condensates with atom chips’ magnetic traps. These ramps are engineered in the context of precision atom interferometry experiments and support transport over large distances, typically of the order of 1 mm, i.e. about 1,000 times the size of the atomic clouds, yet with durations not exceeding 200 ms. We show that with such transport durations of the order of the trap period, one can recover the ground state of the final trap at the end of the transport. The performance of the OCT procedure is compared to that of a Shortcut-To-Adiabaticity (STA) protocol and the respective advantages/disadvantages of the OCT treatment over the STA one are discussed.
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Trimeche A., Battelier B., Becker D., Bertoldi A., Bouyer P., Braxmaier C., Charron E., Corgier R., Cornelius M., Douch K., Gaaloul N., Herrmann S., Müller J., Rasel E., Schubert C., Wu H., & Pereira dos Santos F. (2019). Concept study and preliminary design of a cold atom interferometer for space gravity gradiometry. Clas. Quant. Grav., 36, 215004.
Résumé: We study a space-based gravity gradiometer based on cold atom interferometry and its potential for the Earth's gravitational field mapping. The instrument architecture has been proposed in Carraz et al (2014 Microgravity Sci. Technol. 26 139) and enables high-sensitivity measurements of gravity gradients by using atom interferometers in a differential accelerometer configuration. We present the design of the instrument including its subsystems and analyze the mission scenario, for which we derive the expected instrument performances, the requirements on the sensor and its key subsystems, and the expected impact on the recovery of the Earth gravity field.
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2018 |
Becker D., Lachmann M. D., Seidel S. T., Ahlers H., Amri S., Charron E., Corgier R., Franz T., Gaaloul N., Grosse J., Hellmig O., Herr W., Lüdtke D., Müntinga H., Popp M., Schkolnik V., Wendrich T., Wenzlawski A., Weps B., Braxmeier C., Ertmer W., Krutzik M., Lämmerzahl C., Peters A., Schleich W. P., Sengstock K., Walser R., Windpassinger P., & Rasel E. M. (2018). Space-borne Bose-Einstein condensation for precision interferometry. Nature, 562, 391.
Résumé: Owing to the low-gravity conditions in space, space-borne laboratories enable experiments with extended free-fall times. Because Bose–Einstein condensates have an extremely low expansion energy, space-borne atom interferometers based on Bose–Einstein condensation have the potential to have much greater sensitivity to inertial forces than do similar ground-based interferometers. On 23 January 2017, as part of the sounding-rocket mission MAIUS-1, we created Bose–Einstein condensates in space and conducted 110 experiments central to matter-wave interferometry, including laser cooling and trapping of atoms in the presence of the large accelerations experienced during launch. Here we report on experiments conducted during the six minutes of in-space flight in which we studied the phase transition from a thermal ensemble to a Bose–Einstein condensate and the collective dynamics of the resulting condensate. Our results provide insights into conducting cold-atom experiments in space, such as precision interferometry, and pave the way to miniaturizing cold-atom and photon-based quantum information concepts for satellite-based implementation. In addition, space-borne Bose–Einstein condensation opens up the possibility of quantum gas experiments in low-gravity conditions.
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Corgier R., Amri S., Herr W., Ahlers H., Guéry-Odelin D., Rasel E. M., Charron E., & Gaaloul N. (2018). Fast manipulation of Bose-Einstein condensates with an atom chip. New J. Phys., 20(5), 055002.
Résumé: We present a detailed theoretical analysis of the implementation of shortcut-to-adiabaticity protocols for the fast transport of neutral atoms with atom chips. The objective is to engineer transport ramps with durations not exceeding a few hundred milliseconds to provide metrologically relevant input states for an atomic sensor. Aided by numerical simulations of the classical and quantum dynamics, we study the behavior of a Bose-Einstein condensate in an atom chip setup with realistic anharmonic trapping. We detail the implementation of fast and controlled transports over large distances of several millimeters, i.e. distances 1000 times larger than the size of the atomic cloud. A subsequent optimized release and collimation step demonstrates the capability of our transport method to generate ensembles of quantum gases with expansion speeds in the picokelvin regime. The performance of this procedure is analyzed in terms of collective excitations reflected in residual center of mass and size oscillations of the condensate. We further evaluate the robustness of the protocol against experimental imperfections.
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2016 |
Fedortchenko S., Huppert S., Vasanelli A., Todorov Y., Ciuti C., Keller A., Coudreau T., & Milman P. (2016). Output squeezed radiation from dispersive ultrastrong light-matter coupling. Phys. Rev. A, 94, 013821.
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Finkelstein-Shapiro, D., Calatayud, M., Atabek, O., Mujica, V., & Keller, A. (2016). Nonlinear Fano interferences in open quantum systems: An exactly solvable model. Physical Review A, 93, 063414.
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Ketterer A., Keller, A., Walborn S. P., Coudreau T., & Milman P. (2016). Quantum information processing in phase space: a modular variables approach. Phys. Rev. A, 94, 022325.
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Laversanne-Finot A., Ketterer A., Barros M. R., Walborn S. P., Coudreau T., Keller A., & Milman P. (2016). Contextually in a Peres-Mermin square using arbitrary operators. In Journal of Physics: Conference Series (Vol. 701, 012026).
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Saideh V., Felicetti S., Coudreau T., Milman P., & Keller A. (2016). Generalized spin-squeezing inequalities for particle number with quantum fluctuations. Phys. Rev. A, 94, 032312.
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2015 |
Barros M. R., Farías O. J., Keller A., Coudreau T., Milman P., & Walborn S. P. (2015). Detecting multipartite spatial entanglement with modular variables. Phys. Rev. A, 92, 022308.
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Boucher G., Douce T., Bresteau D., Walborn S. P., Keller A., Coudreau T., Ducci S., & Milman P. (2015). Toolbox for continuous-variable entanglement production and measurement using spontaneous parametric down-conversion. PHYSICAL REVIEW A, 92, 023804.
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Finkelstein-Shapiro, D., Urdaneta, I., Calatayud, M., Atabek, O., Mujica, V., & Keller, A. (2015). Fano-Liouville Spectral Signatures in Open Quantum Systems. Physical Review Letters, 115, 113006.
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Jaouadi, A., Telmini, M., & Charron, E. (2015). Bose-Einstein condensation with a finite number of particles in a power-law trap. Phys. Rev. A, 92(1), 017602.
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Keller A., & Milman P. (2015). La téléportation révolutionne la communication. La Recherche, 501(Juillet).
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Ketterer A., Keller A., Coudreau T., & Milman P. (2015). Testing the Clauser-Horne-Shimony-Holt inequality using observables with arbitrary spectrum. Phys. Rev. A, 91, 012106.
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Moreira S. V., Keller A., Coudreau T., & Milman P. (2015). Modeling Leggett-Garg inequality violation. Phys. Rev. A, 92, 062132.
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Saideh I., Ribeiro A. D., Ferrini G., Coudreau T., Milman P., & Keller A. (2015). General dichotomization procedure to provide qudit entanglement criteria. Phys. Rev. A, 92, 052334.
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2014 |
Boucher G., Eckstein A., Orieux A., Favero I., Leo G., Coudreau T., Keller A., Milman P., & Ducci S. (2014). Polarization-entanglement generation and control in a counterpropagating phase-matching geometry. Phys. Rev. A, 89, 033815.
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Fedortchenko S., Keller A., Coudreau T., & Milman P. (2014). Finite-temperature reservoir engineering and entanglement dynamics. Phys. Rev. A, 90, 042103.
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Mandilara A., Coudreau T., Keller A., & Milman P. (2014). Entanglement classification of pure symmetric states via spin coherent states. Phys. Rev. A, 90, 050302(R).
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Sugny, D., Vranckx, S., Ndong, M., Vaeck, N., Atabek, O., & Desouter-Lecomte, M. (2014). Control of molecular dynamics with zero-area fields: Application to molecular orientation and photofragmentation. Physical Review A, 90, 053404.
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Tarakeshwar P., Palma J. L., Finkelstein-Shapiro D., Keller A., Urdaneta I., Calatayud M., Atabek O., & Mujica V. (2014). SERS as a probe of charge-transfer pathways in hybrid dye/molecule-metal oxide complexes. J. Phys. Chem. C, 118, 3774.
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Urdaneta I., Pilmé J., Keller A., Atabek O., Tarakeshwar P., Mujica V., & Calatayud M. (2014). Probing Raman enhancement in Dopamine-Ti2O4 hybrid using stretched molecular geometries. J. Phys. Chem. A, 118, 1196.
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Vernaz-Gris P., Ketterer A., Keller A., Walborn S. P., Coudreau T., & Milman P. (2014). Continuous discretization of innite-dimensional Hilbert spaces. Phys. Rev. A, 89, 052311.
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2013 |
Douce T., Eckstein A., Walborn S. P., Khoury A. Z., Ducci S., Keller A., Coudreau T., & Milman P. (2013). Direct measurement of the biphoton Wigner function through two-photon interference. Scientific Reports, 3, 3530.
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Jaouadi, A., Desouter-Lecomte M., Lefebvre, R., & Atabek, O. (2013). Signature of exceptional points in the laser control of non-adiabatic vibrational transfer. J. Phys. B: At. Mol. Opt. Phys., 46, 145402.
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Jaouadi, A., Desouter-Lecomte, M., Lefebvre, R., & Atabek, O. (2013). Exceptional points for logic operations at the molecular level. Fortschritte der Physik, 61, 162.
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Orieux, A., Eckstein, A., Lemaître, A., Filloux, P., Favero, I., Leo, G., Coudreau, T., Keller, A., Milman, P., & Ducci, S. (2013). Direct Bell States Generation on a III-V Semiconductor Chip at Room Temperature. PRL, 110(16), 160502.
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2012 |
Borges, C. V. S., Khoury, A. Z., Walborn, S., Ribeiro, P. H. S., Milman, P., & Keller, A. (2012). Bell inequalities with continuous angular variables. Phys. Rev. A., 86(5), 052107.
Résumé: We consider bipartite quantum systems characterized by a continuous angular variable., representing, for instance, the position of a particle on a circle or in a periodic lattice. For this type of system, we show how to violate inequalities similar to Clauser-Horne-Shimony-Holt (CHSH) ones, originally derived for bipartite spin-1/2-like systems. Such inequalities involve correlated measurement of continuous angular functions and are equivalent to the continuous superposition of CHSH inequalities acting on bidimensional subspaces of the infinite dimensional Hilbert space. As an example, we discuss in detail one application of our results, and we derive inequalities based on orientation correlation measurements. The introduced Bell-type inequalities open the perspective of new and simpler experiments to test the assumptions of locality, realism, or freedom of choice in a variety of quantum systems described by continuous variables. We discuss in detail a possible implementation using the orbital angular momentum of photons.
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Kaiser, F., Coudreau, T., Milman, P., Ostrowsky, D. B., & Tanzilli, S. (2012). Entanglement-Enabled Delayed-Choice Experiment. Science, 338(6107), 637–640.
Résumé: Wave-particle complementarity is one of the most intriguing features of quantum physics. To emphasize this measurement apparatus–dependent nature, experiments have been performed in which the output beam splitter of a Mach-Zehnder interferometer is inserted or removed after a photon has already entered the device. A recent extension suggested using a quantum beam splitter at the interferometer’s output; we achieve this using pairs of polarization-entangled photons. One photon is tested in the interferometer and is detected, whereas the other allows us to determine whether wave, particle, or intermediate behaviors have been observed. Furthermore, this experiment allows us to continuously morph the tested photon’s behavior from wavelike to particle-like, which illustrates the inadequacy of a naive wave or particle description of light.
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2011 |
Jaouadi, A., Telmini, M., & Charron, E. (2011). Bose-Einstein condensation with a finite number of particles in a power-law trap. PHYSICAL REVIEW A, 83, 023616.
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2010 |
Jaouadi, A., Gaaloul, N., Viaris de Lesegno, B., Telmini, M., Pruvost, L., & Charron, E. (2010). Bose-Einstein condensation in dark power-law laser traps. PHYSICAL REVIEW A, 82, 023613.
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2009 |
Gaaloul, N., Jaouadi, A., Pruvost, L., Telmini, M., & Charron, E. (2009). Controlled deflection of cold atomic clouds and of Bose-Einstein condensates. EUROPEAN PHYSICAL JOURNAL D, 53, 343.
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Milman, P., Keller, A., Charron, E., & Atabek, O. (2009). Molecular orientation entanglement and temporal Bell-type inequalities. EUROPEAN PHYSICAL JOURNAL D, 53, 383.
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2008 |
Charron, E., Milman, P., Keller, A., & Atabek, O. (2008). Erratum: Quantum phase gate and controlled entanglement with polar molecules [Phys. Rev. A 75, 033414 (2007)]. PHYSICAL REVIEW A, 77(3), 039907.
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