1
|
Christianen A, Zwierlein MW, Groenenboom GC, Karman T. Photoinduced Two-Body Loss of Ultracold Molecules. PHYSICAL REVIEW LETTERS 2019; 123:123402. [PMID: 31633957 DOI: 10.1103/physrevlett.123.123402] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Indexed: 06/10/2023]
Abstract
The lifetime of nonreactive ultracold bialkali gases was conjectured to be limited by sticky collisions amplifying three-body loss. We show that the sticking times were previously overestimated and do not support this hypothesis. We find that electronic excitation of NaK+NaK collision complexes by the trapping laser leads to the experimentally observed two-body loss. We calculate the excitation rate with a quasiclassical, statistical model employing ab initio potentials and transition dipole moments. Using longer laser wavelengths or repulsive box potentials may suppress the losses.
Collapse
Affiliation(s)
- Arthur Christianen
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, the Netherlands
| | - Martin W Zwierlein
- MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Gerrit C Groenenboom
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, the Netherlands
| | - Tijs Karman
- ITAMP, Harvard-Smithsonian Center for Astrophysics, Cambridge, Massachusetts 02138, USA
| |
Collapse
|
2
|
Xin M, Leong WS, Chen Z, Lan SY. Transporting Long-Lived Quantum Spin Coherence in a Photonic Crystal Fiber. PHYSICAL REVIEW LETTERS 2019; 122:163901. [PMID: 31075031 DOI: 10.1103/physrevlett.122.163901] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Indexed: 06/09/2023]
Abstract
Confining particles in hollow-core photonic crystal fibers has opened up new prospects to scale up the distance and time over which particles can be made to interact with light. However, maintaining long-lived quantum spin coherence and/or transporting it over macroscopic distances in a waveguide remain challenging. Here, we demonstrate coherent guiding of ground-state superpositions of ^{85}Rb atoms over a centimeter range and hundreds of milliseconds inside a hollow-core photonic crystal fiber. The decoherence is mainly due to dephasing from the residual differential light shift from the optical trap and the inhomogeneity of an ambient magnetic field. Our experiment establishes an important step towards a versatile platform that can lead to applications in quantum information networks and a matter wave circuit for quantum sensing.
Collapse
Affiliation(s)
- Mingjie Xin
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Wui Seng Leong
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Zilong Chen
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Shau-Yu Lan
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| |
Collapse
|
3
|
Hamzeloui S, Arias N, Abediyeh V, Martínez D, Gutiérrez M, Uruñuela E, del Rio E, Cerda-Méndez E, Gomez E, Valenzuela VM. Towards Precision Measurements at UASLP. ACTA ACUST UNITED AC 2016. [DOI: 10.1088/1742-6596/698/1/012011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
4
|
Kim H, Han HS, Cho D. Magic polarization for optical trapping of atoms without Stark-induced dephasing. PHYSICAL REVIEW LETTERS 2013; 111:243004. [PMID: 24483653 DOI: 10.1103/physrevlett.111.243004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Indexed: 06/03/2023]
Abstract
We demonstrate that the differential ac-Stark shift of a Zeeman-sensitive ground hyperfine transition in an optical trap can be eliminated by using properly polarized trapping light. We use the vector polarizability of an alkali-metal atom to produce a polarization-dependent ac-Stark shift that resembles a Zeeman shift. We study a transition from the |2S1/2,F=2,mF=-2> to the |2S1/2,F=1,mF=-1> state of 7Li to observe 0.59±0.02 Hz linewidth with interrogation time of 2 s and 0.82±0.06 s coherence time of a superposition state. Implications of the narrow linewidth and the long coherence time for precision spectroscopy and quantum information processing using atoms in an optical lattice are discussed.
Collapse
Affiliation(s)
- Huidong Kim
- Department of Physics, Korea University, Seoul 136-713, Korea
| | - Hyok Sang Han
- Department of Physics, Korea University, Seoul 136-713, Korea
| | - D Cho
- Department of Physics, Korea University, Seoul 136-713, Korea
| |
Collapse
|
5
|
Loiko YV, Turpin A, Kalkandjiev TK, Rafailov EU, Mompart J. Generating a three-dimensional dark focus from a single conically refracted light beam. OPTICS LETTERS 2013; 38:4648-4651. [PMID: 24322096 DOI: 10.1364/ol.38.004648] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report here the generation of a three-dimensional (3D) dark focus from a single focused monochromatic Gaussian beam that undergoes conical refraction when it propagates along one of the optic axes of a biaxial crystal. We study the resulting ring intensity pattern behind the crystal as a function of the ratio between the ring radius and the beam waist and derive the particular parameter values for which a 3D dark focus with null intensity at the ring center is formed. We have performed experiments with a KGd(WO(4))(2) biaxial crystal, reporting the generation of a bottle beam in full agreement with our theoretical investigations.
Collapse
|
6
|
Ravets S, Hoffman JE, Kordell PR, Wong-Campos JD, Rolston SL, Orozco LA. Intermodal energy transfer in a tapered optical fiber: optimizing transmission. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2013; 30:2361-2371. [PMID: 24322937 DOI: 10.1364/josaa.30.002361] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We present an experimental and theoretical study of the energy transfer between modes during the tapering process of an optical nanofiber through spectrogram analysis. The results allow optimization of the tapering process, and we measure transmission in excess of 99.95% for the fundamental mode. We quantify the adiabaticity condition through calculations and place an upper bound on the amount of energy transferred to other modes at each step of the tapering, giving practical limits to the tapering angle.
Collapse
|
7
|
Reitz D, Sayrin C, Mitsch R, Schneeweiss P, Rauschenbeutel A. Coherence properties of nanofiber-trapped cesium atoms. PHYSICAL REVIEW LETTERS 2013; 110:243603. [PMID: 25165922 DOI: 10.1103/physrevlett.110.243603] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Indexed: 06/03/2023]
Abstract
We experimentally study the ground state coherence properties of cesium atoms in a nanofiber-based two-color dipole trap, localized ∼ 200 nm away from the fiber surface. Using microwave radiation to coherently drive the clock transition, we record Ramsey fringes as well as spin echo signals and infer a reversible dephasing time of T(2)(*) = 0.6 ms and an irreversible dephasing time of T(2)(') = 3.7 ms. By modeling the signals, we find that, for our experimental parameters, T(2)(*) and T(2)(') are limited by the finite initial temperature of the atomic ensemble and the heating rate, respectively. Our results represent a fundamental step towards establishing nanofiber-based traps for cold atoms as a building block in an optical fiber quantum network.
Collapse
Affiliation(s)
- D Reitz
- Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria
| | - C Sayrin
- Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria
| | - R Mitsch
- Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria
| | - P Schneeweiss
- Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria
| | - A Rauschenbeutel
- Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria
| |
Collapse
|
8
|
Yu S, He X, Xu P, Liu M, Wang J, Zhan M. Single atoms in the ring lattice for quantum information processing and quantum simulation. CHINESE SCIENCE BULLETIN-CHINESE 2012. [DOI: 10.1007/s11434-012-5153-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
9
|
Sheng D, Zhang J, Orozco LA. Sensitivity test of a blue-detuned dipole trap designed for parity non-conservation measurements in Fr. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2012; 83:043106. [PMID: 22559514 DOI: 10.1063/1.3701714] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A dynamic blue-detuned optical dipole trap with stable (87)Rb atoms produces a differential ac Stark shift of 18 Hz in the ground state hyperfine transition, and it preserves the ground state hyperfine superpositions for a long coherence time of 180 ms. The trapped atoms undergoing microwave Rabi oscillations are sensitive to a small signal, artificially generated with a second microwave source, phase locked to the first allowing a simple and effective method for determining signal-to-noise ratio limits through interference techniques. This provides an excellent means of calibrating sensitivity in experiments such as our ongoing Fr parity non-conservation measurement.
Collapse
Affiliation(s)
- D Sheng
- Joint Quantum Institute, Department of Physics, University of Maryland, College Park, Maryland 20742, USA
| | | | | |
Collapse
|
10
|
Xu P, He X, Wang J, Zhan M. Trapping a single atom in a blue detuned optical bottle beam trap. OPTICS LETTERS 2010; 35:2164-2166. [PMID: 20596181 DOI: 10.1364/ol.35.002164] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We demonstrate trapping a single rubidium atom in a blue detuned optical bottle beam trap. The trap was formed by a strongly focused blue detuned laser beam, which passes through a computer-generated circular pi phase hologram displayed on a spatial light modulator. Single atoms were loaded from a magneto-optical trap and stored in the optical trap for several seconds.
Collapse
Affiliation(s)
- Peng Xu
- State Key Laboratory of Magnetic and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | | | | | | |
Collapse
|
11
|
Takamoto M, Katori H, Marmo SI, Ovsiannikov VD, Pal'chikov VG. Prospects for optical clocks with a blue-detuned lattice. PHYSICAL REVIEW LETTERS 2009; 102:063002. [PMID: 19257584 DOI: 10.1103/physrevlett.102.063002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2008] [Indexed: 05/27/2023]
Abstract
We investigated the properties of optical lattice clocks operated with a repulsive light-shift potential. The magic wavelength, where light-shift perturbation for the clock transition cancels, was experimentally determined to be 389.889(9) nm for 87Sr. The hyperpolarizability effects on the clock transition were investigated theoretically. With minimal trapping field perturbation provided by the blue-detuned lattice, the fractional uncertainty due to the hyperpolarizability effects was found to be 2x10;{-19} in the relevant clock transition.
Collapse
Affiliation(s)
- M Takamoto
- Department of Applied Physics, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, 113-8656 Tokyo, Japan and CREST, Japan
| | | | | | | | | |
Collapse
|
12
|
Chuu CS, Strassel T, Zhao B, Koch M, Chen YA, Chen S, Yuan ZS, Schmiedmayer J, Pan JW. Quantum memory with optically trapped atoms. PHYSICAL REVIEW LETTERS 2008; 101:120501. [PMID: 18851349 DOI: 10.1103/physrevlett.101.120501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2008] [Indexed: 05/26/2023]
Abstract
We report the experimental demonstration of quantum memory for collective atomic states in a far-detuned optical dipole trap. Generation of the collective atomic state is heralded by the detection of a Raman scattered photon and accompanied by storage in the ensemble of atoms. The optical dipole trap provides confinement for the atoms during the quantum storage while retaining the atomic coherence. We probe the quantum storage by cross correlation of the photon pair arising from the Raman scattering and the retrieval of the atomic state stored in the memory. Nonclassical correlations are observed for storage times up to 60 mus.
Collapse
Affiliation(s)
- Chih-Sung Chuu
- Physikalisches Institut, Universität Heidelberg, Heidelberg, Germany.
| | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Bouchiat MA. Measuring the Fr weak nuclear charge by observing a linear stark shift with small atomic samples. PHYSICAL REVIEW LETTERS 2008; 100:123003. [PMID: 18517860 DOI: 10.1103/physrevlett.100.123003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2007] [Indexed: 05/26/2023]
Abstract
We study the chirality of ground-state alkali atoms in E and B fields, dressed with a circularly-polarized beam near-detuned ( less, similar1 GHz) from an E-field-assisted forbidden transition such as 7S-8S in Fr. We predict parity violating energy shifts of their sublevels, linear in E and the weak nuclear charge Q_(W). A dressing beam of 10 kW/cm(2) at 506 nm produces a shift of approximately 100 microHz at E=100 V/cm, B greater, similar50 mG which should be observable with approximately 10(4) Fr atoms confined in an optical dipole trap. We discuss optimal conditions, parameter reversals, and a calibration procedure to measure Q_(W)
Collapse
Affiliation(s)
- Marie-Anne Bouchiat
- Département de Physique de l'Ecole Normale Supérieure, F-75231 Paris Cedex 05, France
| |
Collapse
|
14
|
Vengalattore M, Higbie JM, Leslie SR, Guzman J, Sadler LE, Stamper-Kurn DM. High-resolution magnetometry with a spinor Bose-Einstein condensate. PHYSICAL REVIEW LETTERS 2007; 98:200801. [PMID: 17677683 DOI: 10.1103/physrevlett.98.200801] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2006] [Indexed: 05/16/2023]
Abstract
We demonstrate a precise magnetic microscope based on direct imaging of the Larmor precession of a 87Rb spinor Bose-Einstein condensate. This magnetometer attains a field sensitivity of 8.3 pT/Hz1/2 over a measurement area of 120 microm2, an improvement over the low-frequency field sensitivity of modern SQUID magnetometers. The achieved phase sensitivity is close to the atom shot-noise limit, estimated as 0.15 pT/Hz1/2 for a unity duty cycle measurement, suggesting the possibilities of spatially resolved spin-squeezed magnetometry. This magnetometer marks a significant application of degenerate atomic gases to metrology.
Collapse
Affiliation(s)
- M Vengalattore
- Department of Physics, University of California, Berkeley California 94720, USA
| | | | | | | | | | | |
Collapse
|
15
|
Andersen MF, Kaplan A, Grünzweig T, Davidson N. Decay of quantum correlations in atom optics billiards with chaotic and mixed dynamics. PHYSICAL REVIEW LETTERS 2006; 97:104102. [PMID: 17025821 DOI: 10.1103/physrevlett.97.104102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2004] [Indexed: 05/12/2023]
Abstract
We perform echo spectroscopy on ultracold atoms in atom-optics billiards to study their quantum dynamics. The detuning of the trapping laser is used to change the "perturbation", which causes a decay in the echo coherence. Two different regimes are observed: first, a perturbative regime in which the decay of echo coherence is nonmonotonic and partial revivals of coherence are observed in contrast with the predictions of random matrix theory. These revivals are more pronounced in traps with mixed dynamics as compared to traps where the dynamics is fully chaotic. Next, for stronger perturbations, the decay becomes monotonic and independent of the strength of the perturbation. In this regime no clear distinction can be made between chaotic traps and traps with mixed dynamics.
Collapse
Affiliation(s)
- M F Andersen
- Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel
| | | | | | | |
Collapse
|
16
|
Ahluwalia BPS, Cheong WC, Yuan XC, Zhang LS, Tao SH, Bu J, Wang H. Design and fabrication of a double-axicon for generation of tailorable self-imaged three-dimensional intensity voids. OPTICS LETTERS 2006; 31:987-9. [PMID: 16599233 DOI: 10.1364/ol.31.000987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
We propose a new design for fabrication of a highly power-efficient double axicon to generate self-imaged three-dimensional intensity voids along the propagation of a beam. The conventional conical structure of an axicon is modified and shaped like an axiconlike structure with a double-gradient surface profile. The gradient conical surfaces generate Bessel beams with varying radial wave vectors that are superimposed and interfere to generate a sequence of three-dimensional intensity voids. The proposed element was fabricated using electron-beam lithography, and experimental verification of the design is reported.
Collapse
Affiliation(s)
- B P S Ahluwalia
- School of Electrical & Electronic Engineering, Nanyang-Technological University, Nanyang Avenue, Singapore 639798, Singapore
| | | | | | | | | | | | | |
Collapse
|
17
|
Black AT, Thompson JK, Vuletić V. On-demand superradiant conversion of atomic spin gratings into single photons with high efficiency. PHYSICAL REVIEW LETTERS 2005; 95:133601. [PMID: 16197139 DOI: 10.1103/physrevlett.95.133601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2005] [Indexed: 05/04/2023]
Abstract
We create quantized spin gratings by single-photon detection and convert them on demand into photons with retrieval efficiencies exceeding 40% (80%) for single (a few) quanta. We show that the collective conversion process, proceeding via superradiant emission into a moderate-finesse optical resonator, requires phase matching. The storage time of 3 micros in the cold-atom sample, as well as the peak retrieval efficiency, are likely limited by Doppler decoherence of the entangled state.
Collapse
Affiliation(s)
- Adam T Black
- Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | | | | |
Collapse
|
18
|
Higbie JM, Sadler LE, Inouye S, Chikkatur AP, Leslie SR, Moore KL, Savalli V, Stamper-Kurn DM. Direct nondestructive imaging of magnetization in a spin-1 Bose-Einstein gas. PHYSICAL REVIEW LETTERS 2005; 95:050401. [PMID: 16090852 DOI: 10.1103/physrevlett.95.050401] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2005] [Indexed: 05/03/2023]
Abstract
Polarization-dependent phase-contrast imaging is used to resolve the spatial magnetization profile of an optically trapped ultracold gas. This probe is applied to Larmor precession of degenerate and nondegenerate spin-1 87Rb gases. Transverse magnetization of the Bose-Einstein condensate persists for the condensate lifetime, with a spatial response to magnetic field inhomogeneities consistent with a mean-field model of interactions. In comparison, the magnetization of the non-condensed gas decoheres rapidly. Rotational symmetry implies that the Larmor frequency of a spinor condensate be density independent, and thus suitable for precise magnetometry with high spatial resolution.
Collapse
Affiliation(s)
- J M Higbie
- Department of Physics, University of California, Berkeley, California 94720, USA
| | | | | | | | | | | | | | | |
Collapse
|
19
|
Schrader D, Dotsenko I, Khudaverdyan M, Miroshnychenko Y, Rauschenbeutel A, Meschede D. Neutral atom quantum register. PHYSICAL REVIEW LETTERS 2004; 93:150501. [PMID: 15524857 DOI: 10.1103/physrevlett.93.150501] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2004] [Indexed: 05/24/2023]
Abstract
We demonstrate the realization of a quantum register using a string of single neutral atoms which are trapped in an optical dipole trap. The atoms are selectively and coherently manipulated in a magnetic field gradient using microwave radiation. Our addressing scheme operates with a high spatial resolution, and qubit rotations on individual atoms are performed with 99% contrast. In a final readout operation we analyze each individual atomic state. Finally, we have measured the coherence time and identified the predominant dephasing mechanism for our register.
Collapse
Affiliation(s)
- D Schrader
- Institut für Angewandte Physik, Universität Bonn, Wegelerstrasse 8, D-53115 Bonn, Germany
| | | | | | | | | | | |
Collapse
|
20
|
Kuhr S, Alt W, Schrader D, Dotsenko I, Miroshnychenko Y, Rosenfeld W, Khudaverdyan M, Gomer V, Rauschenbeutel A, Meschede D. Coherence properties and quantum state transportation in an optical conveyor belt. PHYSICAL REVIEW LETTERS 2003; 91:213002. [PMID: 14683295 DOI: 10.1103/physrevlett.91.213002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2003] [Indexed: 05/24/2023]
Abstract
We have prepared and detected quantum coherences of trapped cesium atoms with long dephasing times. Controlled transport by an "optical conveyor belt" over macroscopic distances preserves the atomic coherence with slight reduction of coherence time. The limiting dephasing effects are experimentally identified, and we present an analytical model of the reversible and irreversible dephasing mechanisms. Our experimental methods are applicable at the single-atom level. Coherent quantum bit operations along with quantum state transport open the route towards a "quantum shift register" of individual neutral atoms.
Collapse
Affiliation(s)
- S Kuhr
- Institut für Angewandte Physik, Universität Bonn, Wegelerstrasse 8, D-53115 Bonn, Germany.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
21
|
Görlitz A, Gustavson TL, Leanhardt AE, Löw R, Chikkatur AP, Gupta S, Inouye S, Pritchard DE, Ketterle W. Sodium Bose-Einstein condensates in the F = 2 state in a large-volume optical trap. PHYSICAL REVIEW LETTERS 2003; 90:090401. [PMID: 12689206 DOI: 10.1103/physrevlett.90.090401] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2002] [Indexed: 05/24/2023]
Abstract
We have investigated the properties of Bose-Einstein condensates of sodium atoms in the upper hyperfine ground state. Condensates in the high-field seeking [F=2, m(F)=-2> state were created in a large volume optical trap from initially prepared [F=1, m(F)=-1> condensates using a microwave transition at 1.77 GHz. We found condensates in the stretched state [F=2, m(F)=-2> to be stable for several seconds at densities in the range of 10(14) atoms/cm(3). In addition, we studied the clock transition [F=1, m(F)=0> --> [F=2, m(F)=0> in a sodium Bose-Einstein condensate and determined a density-dependent frequency shift of (2.44+/-0.25+/-0.5) x 10(-12) Hz cm(3).
Collapse
Affiliation(s)
- A Görlitz
- Department of Physics, MIT-Harvard Center for Ultracold Atoms, and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
| | | | | | | | | | | | | | | | | |
Collapse
|
22
|
Andersen MF, Kaplan A, Davidson N. Echo spectroscopy and quantum stability of trapped atoms. PHYSICAL REVIEW LETTERS 2003; 90:023001. [PMID: 12570542 DOI: 10.1103/physrevlett.90.023001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2002] [Indexed: 05/24/2023]
Abstract
We investigate the dephasing of ultra cold 85Rb atoms trapped in an optical dipole trap and prepared in a coherent superposition of their two hyperfine ground states by interaction with a microwave pulse. We demonstrate that the dephasing, measured as the Ramsey fringe contrast, can be reversed by stimulating a coherence echo with a pi pulse between the two pi / 2 pulses, in analogy to the photon echo. We also demonstrate that "echo spectroscopy" can be used to study the quantum dynamics in the trap even when more than 10(6) states are thermally populated and to study the crossover from quantum to classical dynamics.
Collapse
Affiliation(s)
- M F Andersen
- Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel
| | | | | |
Collapse
|
23
|
DeMille D. Quantum computation with trapped polar molecules. PHYSICAL REVIEW LETTERS 2002; 88:067901. [PMID: 11863853 DOI: 10.1103/physrevlett.88.067901] [Citation(s) in RCA: 417] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2001] [Indexed: 05/19/2023]
Abstract
We propose a novel physical realization of a quantum computer. The qubits are electric dipole moments of ultracold diatomic molecules, oriented along or against an external electric field. Individual molecules are held in a 1D trap array, with an electric field gradient allowing spectroscopic addressing of each site. Bits are coupled via the electric dipole-dipole interaction. Using technologies similar to those already demonstrated, this design can plausibly lead to a quantum computer with greater, approximately > or = 10(4) qubits, which can perform approximately 10(5) CNOT gates in the anticipated decoherence time of approximately 5 s.
Collapse
Affiliation(s)
- D DeMille
- Department of Physics, P.O. Box 208120, Yale University, New Haven, Connecticut 06520, USA
| |
Collapse
|
24
|
Kulin S, Aubin S, Christe S, Peker B, Rolston SL, Orozco LA. A single hollow-beam optical trap for cold atoms. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/1464-4266/3/6/301] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
25
|
Hatakeyama A, Oe K, Ota K, Hara S, Arai J, Yabuzaki T, Young AR. Slow spin relaxation of Rb atoms confined in glass cells filled with dense 4He gas at 1.85 K. PHYSICAL REVIEW LETTERS 2000; 84:1407-1410. [PMID: 11017529 DOI: 10.1103/physrevlett.84.1407] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/1999] [Indexed: 05/23/2023]
Abstract
At temperatures below 2.1 K, long-lived gaseous Rb atoms in glass cells have been generated with a simple method: irradiating the cells, containing 4He gas and Rb metal, with a cw laser. The obtained atomic Rb density ( approximately 10(8) cm(-3)) decreases with a 1/e time constant of about 10 s at 1.85 K. We have performed optical pumping of the Rb atoms and measured the longitudinal electronic spin relaxation time at 1.85 K as well. For processes (such as Rb-He collisions) which do not remove the atomic Rb from the vapor, this relaxation time is found to be about 60+/-15 s.
Collapse
Affiliation(s)
- A Hatakeyama
- Department of Physics, Faculty of Science, Kyoto University, Kyoto 606-8502, Japan
| | | | | | | | | | | | | |
Collapse
|
26
|
Szriftgiser P, Guéry-Odelin D, Arndt M, Dalibard J. Atomic Wave Diffraction and Interference Using Temporal Slits. PHYSICAL REVIEW LETTERS 1996; 77:4-7. [PMID: 10061757 DOI: 10.1103/physrevlett.77.4] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
27
|
Onofrio R, Viola L. Quantum damping of position due to energy measurements. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1996; 53:3773-3780. [PMID: 9913337 DOI: 10.1103/physreva.53.3773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
28
|
Lee HJ, Adams CS, Kasevich M, Chu S. Raman cooling of atoms in an optical dipole trap. PHYSICAL REVIEW LETTERS 1996; 76:2658-2661. [PMID: 10060756 DOI: 10.1103/physrevlett.76.2658] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
|
29
|
Hope JJ, Savage CM. Mechanical potentials due to Raman transitions. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1996; 53:1697-1701. [PMID: 9913062 DOI: 10.1103/physreva.53.1697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|
30
|
Abstract
We demonstrate a quasi-electrostatic trap for cold Cs atoms, using a focused 20-W CO(2) laser beam (lambda = 10.6 microm). Excluding background gas collisions, we measure a trap loss rate of 0.30(33) atoms/s, which is consistent with the calculated photon-limited loss rate of 3 x 10(-11) atoms/s. We measure a ground-state hyperfine population relaxation lifetime of at least 10 s.
Collapse
|
31
|
Pellizzari T, Marte P, Zoller P. Laser cooling to a single quantum state in a trap: One-dimensional results. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1995; 52:4709-4718. [PMID: 9912811 DOI: 10.1103/physreva.52.4709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
|