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Syrykh C, Schiratti JB, Brion E, Joubert C, Baia M, Marlot L, Maussion C, Danneaux LW, Bologna S, Briere J, Dartigues P, Gaulard P, Haioun C, Jardin F, Molina T, Tilly H, Gomez E, Sondaz D, Copie-Bergman C, Laurent C. 623MO Machine learning-based prediction of germinal center, MYC/BCL2 double protein expressor status, and MYC rearrangement from whole slide images in DLBCL patients. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.07.749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Neveu P, Delpy J, Liu S, Banerjee C, Lugani J, Bretenaker F, Brion E, Goldfarb F. Generation of squeezed light vacuum enabled by coherent population trapping. Opt Express 2021; 29:10471-10479. [PMID: 33820181 DOI: 10.1364/oe.419495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 03/08/2021] [Indexed: 06/12/2023]
Abstract
We demonstrate the possibility to generate squeezed vacuum states of light by four wave mixing (FWM) enabled coherent population trapping in a metastable helium cell at room temperature. Contrary to usual FWM far detuned schemes, we work at resonance with an atomic transition. We investigate the properties of such states and show that the noise variances of the squeezed and anti-squeezed quadratures cannot be explained by the simple presence of losses. A specific model allows us to demonstrate the role played by spontaneous emitted photons, which experience squeezing while propagation inside of the cell. This theoretical model, which takes into account both residual absorption and spontaneous emission, leads to an excellent agreement with the experimental data without any adjusted parameter.
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Neveu P, Maynard MA, Bouchez R, Lugani J, Ghosh R, Bretenaker F, Goldfarb F, Brion E. Coherent Population Oscillation-Based Light Storage. Phys Rev Lett 2017; 118:073605. [PMID: 28256885 DOI: 10.1103/physrevlett.118.073605] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Indexed: 06/06/2023]
Abstract
We theoretically study the propagation and storage of a classical field in a Λ-type atomic medium using coherent population oscillations (CPOs). We show that the propagation eigenmodes strongly relate to the different CPO modes of the system. Light storage in such modes is discussed by introducing a "populariton" quantity, a mixture of populations and field, by analogy to the dark state polariton used in the context of electromagnetically induced transparency light storage protocol. As experimentally shown, this memory relies on populations and is then-by contrast with usual Raman coherence optical storage protocols-robust to dephasing effects.
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Affiliation(s)
- P Neveu
- Laboratoire Aimé Cotton, Université Paris-Sud, ENS Paris-Saclay, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - M-A Maynard
- Laboratoire Aimé Cotton, Université Paris-Sud, ENS Paris-Saclay, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - R Bouchez
- Laboratoire Aimé Cotton, Université Paris-Sud, ENS Paris-Saclay, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - J Lugani
- Laboratoire Aimé Cotton, Université Paris-Sud, ENS Paris-Saclay, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - R Ghosh
- Shiv Nadar University, Gautam Budh Nagar, Uttar Pradesh 201314, India
| | - F Bretenaker
- Laboratoire Aimé Cotton, Université Paris-Sud, ENS Paris-Saclay, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - F Goldfarb
- Laboratoire Aimé Cotton, Université Paris-Sud, ENS Paris-Saclay, CNRS, Université Paris-Saclay, 91405 Orsay, France
| | - E Brion
- Laboratoire Aimé Cotton, Université Paris-Sud, ENS Paris-Saclay, CNRS, Université Paris-Saclay, 91405 Orsay, France
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Grankin A, Brion E, Boddeda R, Ćuk S, Usmani I, Ourjoumtsev A, Grangier P. Inelastic Photon Scattering via the Intracavity Rydberg Blockade. Phys Rev Lett 2016; 117:253602. [PMID: 28036216 DOI: 10.1103/physrevlett.117.253602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Indexed: 06/06/2023]
Abstract
Electromagnetically induced transparency (EIT) in a ladder system involving a Rydberg level is known to yield giant optical nonlinearities for the probe field, even in the few-photon regime. This enhancement is due to the strong dipole-dipole interactions between Rydberg atoms and the resulting excitation blockade phenomenon. In order to study such highly correlated media, ad hoc models or low-excitation assumptions are generally used to tackle their dynamical response to optical fields. Here, we study the behavior of a cavity Rydberg-EIT setup in the nonequilibrium quantum field formalism, and we obtain analytic expressions for elastic and inelastic components of the cavity transmission spectrum, valid up to higher excitation numbers than previously achieved. This allows us to identify and interpret a polaritonic resonance structure, to our knowledge unreported so far.
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Affiliation(s)
- A Grankin
- Laboratoire Charles Fabry, Institut d'Optique Graduate School, CNRS, Université Paris-Saclay, 91127 Palaiseau, France
| | - E Brion
- Laboratoire Aimé Cotton, Université Paris-Sud, ENS Cachan, CNRS, Université Paris-Saclay, 91405 Orsay Cedex, France
| | - R Boddeda
- Laboratoire Charles Fabry, Institut d'Optique Graduate School, CNRS, Université Paris-Saclay, 91127 Palaiseau, France
| | - S Ćuk
- Laboratoire Charles Fabry, Institut d'Optique Graduate School, CNRS, Université Paris-Saclay, 91127 Palaiseau, France
| | - I Usmani
- Laboratoire Charles Fabry, Institut d'Optique Graduate School, CNRS, Université Paris-Saclay, 91127 Palaiseau, France
| | - A Ourjoumtsev
- Laboratoire Charles Fabry, Institut d'Optique Graduate School, CNRS, Université Paris-Saclay, 91127 Palaiseau, France
| | - P Grangier
- Laboratoire Charles Fabry, Institut d'Optique Graduate School, CNRS, Université Paris-Saclay, 91127 Palaiseau, France
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Aharonian F, Akhperjanian AG, Barres de Almeida U, Bazer-Bachi AR, Becherini Y, Behera B, Benbow W, Bernlöhr K, Boisson C, Bochow A, Borrel V, Braun I, Brion E, Brucker J, Brun P, Brucker R, Bulik T, Büsching I, Boutelier T, Carrigan S, Chadwick PM, Charbonnier A, Chaves RCG, Cheesebrough A, Chounet LM, Clapson AC, Coignet G, Costamante L, Dalton M, Degrange B, Deil C, Dickinson HJ, Djannati-Ataï A, Domainko W, Drury LO, Dubois F, Dubus G, Dyks J, Dyrda M, Egberts K, Emmanoulopoulos D, Espigat P, Farnier C, Feinstein F, Fiasson A, Fontaine G, Füsling M, Gabici S, Gallant YA, Gérard L, Giebels B, Glicenstein JF, Glück B, Goret P, Hadjichristidis C, Hauser D, Hauser M, Heinz S, Heinzelmann G, Henri G, Hermann G, Hinton JA, Hoffmann A, Hofmann W, Holleran M, Hoppe S, Horns D, Jacholkowska A, de Jager OC, Jung I, Katarzyński K, Kaufmann S, Kendziorra E, Kerschhaggl M, Khangulyan D, Khélifi B, Keogh D, Komin N, Kosack K, Lamanna G, Lenain JP, Lohse T, Marandon V, Martin JM, Martineau-Huynh O, Marcowith A, Maurin D, McComb TJL, Medina C, Moderski R, Moulin E, Naumann-Godo M, de Naurois M, Nedbal D, Nekrassov D, Niemiec J, Nolan SJ, Ohm S, Olive JF, de Oña Wilhelmi E, Orford KJ, Osborne JL, Ostrowski M, Panter M, Pedaletti G, Pelletier G, Petrucci PO, Pita S, Pühlhofer G, Punch M, Quirrenbach A, Raubenheimer BC, Raue M, Rayner SM, Renaud M, Rieger F, Ripken J, Rob L, Rosier-Lees S, Rowell G, Rudak B, Rulten CB, Ruppel J, Sahakian V, Santangelo A, Schlickeiser R, Schöck FM, Schröder R, Schwanke U, Schwarzburg S, Schwemmer S, Shalchi A, Skilton JL, Sol H, Spangler D, Stawarz Ł, Steenkamp R, Stegmann C, Superina G, Tam PH, Tavernet JP, Terrier R, Tibolla O, van Eldik C, Vasileiadis G, Venter C, Vialle JP, Vincent P, Vivier M, Völk HJ, Volpe F, Wagner SJ, Ward M, Zdziarski AA, Zech A. Energy spectrum of cosmic-ray electrons at TeV energies. Phys Rev Lett 2008; 101:261104. [PMID: 19437632 DOI: 10.1103/physrevlett.101.261104] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The very large collection area of ground-based gamma-ray telescopes gives them a substantial advantage over balloon or satellite based instruments in the detection of very-high-energy (>600 GeV) cosmic-ray electrons. Here we present the electron spectrum derived from data taken with the High Energy Stereoscopic System (H.E.S.S.) of imaging atmospheric Cherenkov telescopes. In this measurement, the first of this type, we are able to extend the measurement of the electron spectrum beyond the range accessible to direct measurements. We find evidence for a substantial steepening in the energy spectrum above 600 GeV compared to lower energies.
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Affiliation(s)
- F Aharonian
- Max-Planck-Institut für Kernphysik, P.O. Box 103980, D 69029 Heidelberg, Germany
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Aharonian F, Akhperjanian AG, Barres de Almeida U, Bazer-Bachi AR, Becherini Y, Behera B, Beilicke M, Benbow W, Bernlöhr K, Boisson C, Bochow A, Borrel V, Braun I, Brion E, Brucker J, Brun P, Bühler R, Bulik T, Büsching I, Boutelier T, Carrigan S, Chadwick PM, Charbonnier A, Chaves RCG, Chounet LM, Clapson AC, Coignet G, Costamante L, Dalton M, Degrange B, Deil C, Dickinson HJ, Djannati-Ataï A, Domainko W, Drury LO, Dubois F, Dubus G, Dyks J, Egberts K, Emmanoulopoulos D, Espigat P, Farnier C, Feinstein F, Fiasson A, Förster A, Fontaine G, Füssling M, Gabici S, Gallant YA, Gérard L, Giebels B, Glicenstein JF, Glück B, Goret P, Hadjichristidis C, Hauser D, Hauser M, Heinz S, Heinzelmann G, Henri G, Hermann G, Hinton JA, Hoffmann A, Hofmann W, Holleran M, Hoppe S, Horns D, Jacholkowska A, de Jager OC, Jung I, Katarzyński K, Kaufmann S, Kendziorra E, Kerschhaggl M, Khangulyan D, Khélifi B, Keogh D, Komin N, Kosack K, Lamanna G, Lenain JP, Lohse T, Marandon V, Martin JM, Martineau-Huynh O, Marcowith A, Maurin D, McComb TJL, Medina C, Moderski R, Moulin E, Naumann-Godo M, de Naurois M, Nedbal D, Nekrassov D, Niemiec J, Nolan SJ, Ohm S, Olive JF, de Oña Wilhelmi E, Orford KJ, Osborne JL, Ostrowski M, Panter M, Pedaletti G, Pelletier G, Petrucci PO, Pita S, Pühlhofer G, Punch M, Quirrenbach A, Raubenheimer BC, Raue M, Rayner SM, Renaud M, Rieger F, Ripken J, Rob L, Rosier-Lees S, Rowell G, Rudak B, Ruppel J, Sahakian V, Santangelo A, Schlickeiser R, Schöck FM, Schröder R, Schwanke U, Schwarzburg S, Schwemmer S, Shalchi A, Skilton JL, Sol H, Spangler D, Stawarz Ł, Steenkamp R, Stegmann C, Superina G, Tam PH, Tavernet JP, Terrier R, Tibolla O, van Eldik C, Vasileiadis G, Venter C, Vialle JP, Vincent P, Vivier M, Völk HJ, Volpe F, Wagner SJ, Ward M, Zdziarski AA, Zech A. Limits on an energy dependence of the speed of light from a flare of the active galaxy PKS 2155-304. Phys Rev Lett 2008; 101:170402. [PMID: 18999724 DOI: 10.1103/physrevlett.101.170402] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2008] [Indexed: 05/27/2023]
Abstract
In the past few decades, several models have predicted an energy dependence of the speed of light in the context of quantum gravity. For cosmological sources such as active galaxies, this minuscule effect can add up to measurable photon-energy dependent time lags. In this Letter a search for such time lags during the High Energy Stereoscopic System observations of the exceptional very high energy flare of the active galaxy PKS 2155-304 on 28 July 2006 is presented. Since no significant time lag is found, lower limits on the energy scale of speed of light modifications are derived.
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Affiliation(s)
- F Aharonian
- Max-Planck-Institut für Kernphysik, Heidelberg, Germany
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Brion E, Pedersen LH, Saffman M, Mølmer K. Error correction in ensemble registers for quantum repeaters and quantum computers. Phys Rev Lett 2008; 100:110506. [PMID: 18517772 DOI: 10.1103/physrevlett.100.110506] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2007] [Indexed: 05/26/2023]
Abstract
We propose to use a collective excitation blockade mechanism to identify errors that occur due to disturbances of single atoms in ensemble quantum registers where qubits are stored in the collective population of different internal atomic states. A simple error correction procedure and a simple decoherence-free encoding of ensemble qubits in the hyperfine states of alkali-metal atoms are presented.
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Affiliation(s)
- E Brion
- Institute for Mathematical Sciences, Imperial College London, SW7 2PE, United Kingdom
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Abstract
We propose a new physical approach for encoding and processing of quantum information in ensembles of multilevel quantum systems, where the different bits are not carried by individual particles but associated with the collective population of different internal levels. One- and two-bit gates are implemented by collective internal state transitions taking place in the presence of an excitation blockade mechanism, which restricts the population of each internal state to the values zero and unity. Quantum computers with 10-20 bits can be built via this scheme in single trapped clouds of ground state atoms subject to the Rydberg excitation blockade mechanism, and the linear dependence between register size and the number of internal quantum states in atoms offers realistic means to reach larger registers.
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Affiliation(s)
- E Brion
- Lundbeck Foundation Theoretical Center for Quantum System Research, Department of Physics and Astronomy, University of Aarhus, DK-8000 Arhus C, Denmark
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