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Lopez JP, de Almeida AJF, Felinto D, Tabosa JWR. Optical memory based on quantized atomic center-of-mass motion. Opt Lett 2017; 42:4474-4477. [PMID: 29088191 DOI: 10.1364/ol.42.004474] [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: 09/05/2017] [Accepted: 10/02/2017] [Indexed: 06/07/2023]
Abstract
We report a new type of optical memory using a pure two-level system of cesium atoms cooled by the magnetically assisted Sisyphus effect. The optical information of a probe field is stored in the coherence between quantized vibrational levels of the atoms in the potential wells of a 1-D optical lattice. The retrieved pulse shows Rabi oscillations with a frequency determined by the reading beam intensity and are qualitatively understood in terms of a simple theoretical model. The exploration of the external degrees of freedom of an atom may add another capability in the design of quantum-information protocols using light.
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Borba GC, Barreiro S, Pruvost L, Felinto D, Tabosa JWR. Narrow band amplification of light carrying orbital angular momentum. Opt Express 2016; 24:10078-10086. [PMID: 27137618 DOI: 10.1364/oe.24.010078] [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] [Indexed: 06/05/2023]
Abstract
We report on the amplification of an optical vortex beam carrying orbital angular momentum via induced narrow Raman gain in an ensemble of cold cesium atoms. A 20% single-pass Raman gain of a weak vortex signal field is observed with a spectral width of order of 1 MHz, much smaller than the natural width, demonstrating that the amplification process preserves the phase structure of the vortex beam. The gain is observed in the degenerated two-level system associated with the hyperfine transition 6S1/2(F = 3) ↔ 6P3/2(F' = 2) of cesium. Our experimental observations are explained with a simple theoretical model based on a three-level Λ system interacting coherently with the weak Laguerre-Gauss field and a strong coupling field, including an incoherent pumping rate between the two degenerate ground-states.
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Costanzo LS, Coelho AS, Pellegrino D, Mendes MS, Acioli L, Cassemiro KN, Felinto D, Zavatta A, Bellini M. Zero-Area Single-Photon Pulses. Phys Rev Lett 2016; 116:023602. [PMID: 26824539 DOI: 10.1103/physrevlett.116.023602] [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: 05/29/2015] [Indexed: 06/05/2023]
Abstract
Broadband single photons are usually considered not to couple efficiently to atomic gases because of the large mismatch in bandwidth. Contrary to this intuitive picture, here we demonstrate that the interaction of ultrashort single photons with a dense resonant atomic sample deeply modifies the temporal shape of their wave packet mode without degrading their nonclassical character, and effectively generates zero-area single-photon pulses. This is a clear signature of strong transient coupling between single broadband (THz-level) light quanta and atoms, with intriguing fundamental implications and possible new applications to the storage of quantum information.
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Affiliation(s)
- L S Costanzo
- Istituto Nazionale di Ottica (INO-CNR), Largo Enrico Fermi 6, 50125 Florence, Italy
- European Laboratory for Non-linear Spectroscopy (LENS) and Department of Physics, University of Firenze, 50019 Sesto Fiorentino, Florence, Italy
| | - A S Coelho
- Departamento de Engenharia, Centro Universitário UNINOFAPI, 64073-505 Teresina, Piauí, Brazil
| | - D Pellegrino
- European Laboratory for Non-linear Spectroscopy (LENS) and Department of Physics, University of Firenze, 50019 Sesto Fiorentino, Florence, Italy
| | - M S Mendes
- Departamento de Fisica, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil
| | - L Acioli
- Departamento de Fisica, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil
| | - K N Cassemiro
- Departamento de Fisica, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil
| | - D Felinto
- Departamento de Fisica, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil
| | - A Zavatta
- Istituto Nazionale di Ottica (INO-CNR), Largo Enrico Fermi 6, 50125 Florence, Italy
- European Laboratory for Non-linear Spectroscopy (LENS) and Department of Physics, University of Firenze, 50019 Sesto Fiorentino, Florence, Italy
| | - M Bellini
- Istituto Nazionale di Ottica (INO-CNR), Largo Enrico Fermi 6, 50125 Florence, Italy
- European Laboratory for Non-linear Spectroscopy (LENS) and Department of Physics, University of Firenze, 50019 Sesto Fiorentino, Florence, Italy
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de Oliveira RA, Borba GC, Martins WS, Barreiro S, Felinto D, Tabosa JWR. Nonlinear optical memory for manipulation of orbital angular momentum of light. Opt Lett 2015; 40:4939-4942. [PMID: 26512488 DOI: 10.1364/ol.40.004939] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report on the demonstration of a nonlinear optical memory (NOM) for storage and on-demand manipulation of orbital angular momentum (OAM) of light via higher-order nonlinear processes in cold cesium atoms. A spatially resolved phase-matching technique is used to select each order of the nonlinear susceptibility associated, respectively, with time-delayed four-, six-, and eight-wave mixing processes. For a specific configuration of the stored OAM of the incident beams, we demonstrated that the OAM of the retrieved beam can be manipulated according to the order of the nonlinear process chosen by the operator for reading out the NOM. This demonstration indicates new pathways for applications in classical and quantum information processing where OAM of light is used to encode optical information.
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de Almeida AJF, Barreiro S, Martins WS, de Oliveira RA, Felinto D, Pruvost L, Tabosa JWR. Storage of orbital angular momenta of light via coherent population oscillation. Opt Lett 2015; 40:2545-2548. [PMID: 26030553 DOI: 10.1364/ol.40.002545] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report on the storage of orbital angular momenta (OAM) of light via the phenomenon of coherent population oscillation (CPO) in cold cesium atoms. The experiment is performed using a delayed four wave mixing configuration, where the transverse optical information of a probe field carrying OAM associated with its azimuthal phase dependence is stored in the CPO of Zeeman sublevels of the hyperfine transition F=3→F'=2 of the cesium D2 line. We also demonstrate experimentally the simultaneous storage and retrieval of different OAM states propagating along different directions in space, leading to algebraic operations with OAM and, therefore, opening the possibility of multiplexing OAM states.
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Felinto D, Cruz LS, de Oliveira RA, Florez HM, de Miranda MHG, Nussenzveig P, Martinelli M, Tabosa JWR. Physical interpretation for the correlation spectra of electromagnetically-induced-transparency resonances. Opt Express 2013; 21:1512-1519. [PMID: 23389133 DOI: 10.1364/oe.21.001512] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The phenomenon called Electromagnetically Induced Transparency (EIT) may induce different types of correlation between two optical fields interacting with an ensemble of atoms. It is presently well known, for example, that in the vicinity of an EIT resonance the dominant correlations at low powers turn into anti-correlations as power increases. Such correlation spectra present striking power-broadening-independent features, with the best condition for measuring the characteristic linewidth occurring at the highest powers. In the present work we investigate the physical mechanisms responsible for this set of observations. Our approach is first to reproduce these effects in a better controlled experimental setup: a cold atomic ensemble, obtained from a magneto-optical trap. The results from this conceptually simpler system were then compared to a correspondingly simpler theory, which clearly relates the observed features to the interplay between two key aspects of EIT: the transparency itself and the steep normal dispersion near two-photon resonance.
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Affiliation(s)
- D Felinto
- Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, Brazil.
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Felinto D, Moretti D, de Oliveira RA, Tabosa JWR. Delayed four- and six-wave mixing in a coherently prepared atomic ensemble. Opt Lett 2010; 35:3937-3939. [PMID: 21124571 DOI: 10.1364/ol.35.003937] [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] [Indexed: 05/30/2023]
Abstract
We report on the simultaneous observation, by delayed Bragg diffraction, of four- and six-wave mixing processes in a coherently prepared atomic ensemble consisting of cold cesium atoms. For each diffracted order, we observe different temporal pulse shapes and dependencies with the intensities of the exciting fields, evidencing the different mechanisms involved in each process. The various observations are well described by a simplified analytical theory, which considers the atomic system as an ensemble of three-level atoms in Λ configuration.
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Affiliation(s)
- D Felinto
- Departamento de Física, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil
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de Riedmatten H, Laurat J, Chou CW, Schomburg EW, Felinto D, Kimble HJ. Direct measurement of decoherence for entanglement between a photon and stored atomic excitation. Phys Rev Lett 2006; 97:113603. [PMID: 17025884 DOI: 10.1103/physrevlett.97.113603] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2006] [Indexed: 05/12/2023]
Abstract
Violations of a Bell inequality are reported for an experiment where one of two entangled qubits is stored in a collective atomic memory for a user-defined time delay. The atomic qubit is found to preserve the violation of a Bell inequality for storage times up to 21 micros, 700 times longer than the duration of the excitation pulse that creates the entanglement. To address the question of the security of entanglement-based cryptography implemented with this system, an investigation of the Bell violation as a function of the cross correlation between the generated nonclassical fields is reported, with saturation of the violation close to the maximum value allowed by quantum mechanics.
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Affiliation(s)
- H de Riedmatten
- Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, California 91125, USA
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Chou CW, de Riedmatten H, Felinto D, Polyakov SV, van Enk SJ, Kimble HJ. Measurement-induced entanglement for excitation stored in remote atomic ensembles. Nature 2005; 438:828-32. [PMID: 16341008 DOI: 10.1038/nature04353] [Citation(s) in RCA: 133] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2005] [Accepted: 10/19/2005] [Indexed: 11/09/2022]
Abstract
A critical requirement for diverse applications in quantum information science is the capability to disseminate quantum resources over complex quantum networks. For example, the coherent distribution of entangled quantum states together with quantum memory (for storing the states) can enable scalable architectures for quantum computation, communication and metrology. Here we report observations of entanglement between two atomic ensembles located in distinct, spatially separated set-ups. Quantum interference in the detection of a photon emitted by one of the samples projects the otherwise independent ensembles into an entangled state with one joint excitation stored remotely in 10(5) atoms at each site. After a programmable delay, we confirm entanglement by mapping the state of the atoms to optical fields and measuring mutual coherences and photon statistics for these fields. We thereby determine a quantitative lower bound for the entanglement of the joint state of the ensembles. Our observations represent significant progress in the ability to distribute and store entangled quantum states.
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Affiliation(s)
- C W Chou
- Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, California 91125, USA
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Ferraz J, Felinto D, Acioli LH, Vianna SS. Quantum interference in atomic vapor observed by four-wave mixing with incoherent light. Opt Lett 2005; 30:1876-8. [PMID: 16092375 DOI: 10.1364/ol.30.001876] [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] [Indexed: 05/03/2023]
Abstract
Pairs of pulses from an incoherent source are used to investigate the time-resolved four-wave mixing response of atomic rubidium when a two-photon resonance is involved in the nonlinear process. By varying the relative polarization of the pulse pairs, we are able to select the quantum pathways and clearly distinguish optical and quantum interferences.
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Affiliation(s)
- J Ferraz
- Departmento de Física, Universidade Federal de Pernambuco, Cidade Universitária, Recife, PE 5067-901, Brazil.
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Polyakov SV, Chou CW, Felinto D, Kimble HJ. Temporal dynamics of photon pairs generated by an atomic ensemble. Phys Rev Lett 2004; 93:263601. [PMID: 15697978 DOI: 10.1103/physrevlett.93.263601] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2004] [Indexed: 05/24/2023]
Abstract
The time dependence of nonclassical correlations is investigated for two fields (1,2) generated by an ensemble of cold cesium atoms via the protocol of Duan et al. [Nature (London) 414, 413 (2001)]]. The correlation function R(t1,t2) for the ratio of cross to autocorrelations for the (1,2) fields at times (t1,t2) is found to have a maximum value R(max=292+/-57, which significantly violates the Cauchy-Schwarz inequality R< or =1 for classical fields. Decoherence of quantum correlations is observed over taud approximately 175 ns, and is described by our model, as is a new scheme to mitigate this effect.
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Affiliation(s)
- S V Polyakov
- Norman Bridge Laboratory of Physics 12-33, California Institute of Technology, Pasadena, California 91125, USA
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Abstract
An experimental investigation of the coherent interaction of femtosecond pulses with two resonant sequential transitions of Rb atoms is presented. Fluorescence from the atomic system exhibits beating at a frequency given by difference in the sequential atomic transitions. The results are interpreted in terms of quantum interference in the induced coherence and its interaction with the field that results from a cooperative emission process.
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