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Journal articles on the topic 'Magneto-optical traps; Cold atom traps'

Author: Grafiati

Published: 4 June 2021

Last updated: 9 February 2022

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1

Grabowski, A., and T. Pfau. "A lattice of magneto-optical and magnetic traps for cold atoms." European Physical Journal D 22, no. 3 (March 2003): 347–54. http://dx.doi.org/10.1140/epjd/e2003-00047-3.

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2

Bober, M., J. Zachorowski, W. Gawlik, P. Morzyński, M. Zawada, D. Lisak, A. Cygan, et al. "Precision spectroscopy of cold strontium atoms, towards optical atomic clock." Bulletin of the Polish Academy of Sciences: Technical Sciences 60, no. 4 (December 1, 2012): 707–10. http://dx.doi.org/10.2478/v10175-012-0082-x.

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Abstract This report concerns the experiment of precision spectroscopy of cold strontium atoms in the Polish National Laboratory of Atomic, Molecular and Optical Physics in Toruń. The system is composed of a Zeeman slower and magneto-optical traps (at 461 nm and 689 nm), a frequency comb, and a narrow-band laser locked to an ultra-stable optical cavity. All parts of the experiment are prepared and the first measurements of the absolute frequency of the 1S0-3P1, 689 nm optical transition in 88Sr atoms are performed.

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3

Bagnato, V. S., N. P. Bigelow, L. G. Marcassa, and S. C. Zilio. "Observation of Double Stable Clouds of Cold Atoms in Magneto-Optical Traps." Japanese Journal of Applied Physics 35, Part 1, No. 9A (September 15, 1996): 4664–67. http://dx.doi.org/10.1143/jjap.35.4664.

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4

Band, Y. B., and P. S. Julienne. "Optical-Bloch-equation method for cold-atom collisions: Cs loss from optical traps." Physical Review A 46, no. 1 (July 1, 1992): 330–43. http://dx.doi.org/10.1103/physreva.46.330.

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5

DE OLIVEIRA, M. C., and B. R. DA CUNHA. "COLLISION-DEPENDENT ATOM TUNNELING RATE — BOSE–EINSTEIN CONDENSATES IN DOUBLE AND MULTIPLE WELL TRAPS." International Journal of Modern Physics B 23, no. 32 (December 30, 2009): 5867–80. http://dx.doi.org/10.1142/s0217979209054818.

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The overlap of localized wave functions in a two-mode approximation leads to interaction (cross-collision) between ultra-cold atoms trapped in distinct sites of a double-well potential. We show that this interaction can significantly change the atom tunneling rate for special trap configurations resulting in an effective linear Rabi regime of population oscillation between the trap wells. In this sense, we demonstrate that cross-collisional effects can significantly extend the validity of the two-mode model approach allowing it to be alternatively employed to explain the recently observed increase of tunneling rates due to nonlinear interactions. Moreover, we investigate the extension for ultra-cold atoms trapped in an optical lattice. Control over the cross-collisional terms, obtained through manipulation of the optical trapping potential, can be used as an engineering tool to study many-body physics.

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6

Yurovsky, V. A., and A. Ben-Reuven. "Incomplete optical shielding in cold atom traps: three-dimensional Landau-Zener theory." Physical Review A 55, no. 5 (May 1, 1997): 3772–79. http://dx.doi.org/10.1103/physreva.55.3772.

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7

Béguin, J. B., J. Laurat, X. Luan, A. P. Burgers, Z. Qin, and H. J. Kimble. "Reduced volume and reflection for bright optical tweezers with radial Laguerre–Gauss beams." Proceedings of the National Academy of Sciences 117, no. 42 (October 2, 2020): 26109–17. http://dx.doi.org/10.1073/pnas.2014017117.

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Spatially structured light has opened a wide range of opportunities for enhanced imaging as well as optical manipulation and particle confinement. Here, we show that phase-coherent illumination with superpositions of radial Laguerre–Gauss (LG) beams provides improved localization for bright optical tweezer traps, with narrowed radial and axial intensity distributions. Further, the Gouy phase shifts for sums of tightly focused radial LG fields can be exploited for phase-contrast strategies at the wavelength scale. One example developed here is the suppression of interference fringes from reflection near nanodielectric surfaces, with the promise of improved cold-atom delivery and manipulation.

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8

Jessen, P. S., D. L. Haycock, G. Klose, G. A. Smith, I. H. Deutsch, and G. K. Brennen. "Quantum control and information processing in optical lattices." Quantum Information and Computation 1, Special (December 2001): 20–32. http://dx.doi.org/10.26421/qic1.s-5.

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Neutral atoms offer a promising platform for single- and many-body quantum control, as required for quantum information processing. This includes excellent isolation from the decohering influence of the environment, and the existence of well developed techniques for atom trapping and coherent manipulation. We present a review of our work to implement quantum control and measurement for ultra-cold atoms in far-off-resonance optical lattice traps. In recent experiments we have demonstrated coherent behavior of mesoscopic atomic spinor wavepackets in optical double-well potentials, and carried out quantum state tomography to reconstruct the full density matrix for the atomic spin degrees of freedom. This model system shares a number of important features with proposals to implement quantum logic and quantum computing in optical lattices. We present a theoretical analysis of a protocol for universal quantum logic via single qubit operations and an entangling gate based on electric dipole-dipole interactions. Detailed calculations including the full atomic hyperfine structure suggests that high-fidelity quantum gates are possible under realistic experimental conditions.

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9

Pollock, S., J. P. Cotter, A. Laliotis, F. Ramirez-Martinez, and E. A. Hinds. "Characteristics of integrated magneto-optical traps for atom chips." New Journal of Physics 13, no. 4 (April 19, 2011): 043029. http://dx.doi.org/10.1088/1367-2630/13/4/043029.

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10

Eriksson, S., F. Ramirez-Martinez, E. A. Curtis, B. E. Sauer, P. W. Nutter, E. W. Hill, and E. A. Hinds. "Micron-sized atom traps made from magneto-optical thin films." Applied Physics B 79, no. 7 (September 29, 2004): 811–16. http://dx.doi.org/10.1007/s00340-004-1655-7.

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11

Diry, Fabienne, Michael Mestre, Bruno Viaris de Lesegno, and Laurence Pruvost. "Cold atoms in holographically shaped optical traps." Journal of Physics: Conference Series 194, no. 12 (November 1, 2009): 122010. http://dx.doi.org/10.1088/1742-6596/194/12/122010.

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12

Yan, Hui, Guo-Qing Yang, Tao Shi, Jin Wang, and Ming-Sheng Zhan. "Experimental demonstration of controllable double magneto-optical traps on an atom chip." Journal of the Optical Society of America B 25, no. 10 (September 18, 2008): 1667. http://dx.doi.org/10.1364/josab.25.001667.

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13

Karpa, Leon. "Interactions of Ions and Ultracold Neutral Atom Ensembles in Composite Optical Dipole Traps: Developments and Perspectives." Atoms 9, no. 3 (July 4, 2021): 39. http://dx.doi.org/10.3390/atoms9030039.

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Ion–atom interactions are a comparatively recent field of research that has drawn considerable attention due to its applications in areas including quantum chemistry and quantum simulations. In first experiments, atomic ions and neutral atoms have been successfully overlapped by devising hybrid apparatuses combining established trapping methods, Paul traps for ions and optical or magneto-optical traps for neutral atoms, respectively. Since then, the field has seen considerable progress, but the inherent presence of radiofrequency (rf) fields in such hybrid traps was found to have a limiting impact on the achievable collision energies. Recently, it was shown that suitable combinations of optical dipole traps (ODTs) can be used for trapping both atoms and atomic ions alike, allowing to carry out experiments in absence of any rf fields. Here, we show that the expected cooling in such bichromatic traps is highly sensitive to relative position fluctuations between the two optical trapping beams, suggesting that this is the dominant mechanism limiting the currently observed cooling performance. We discuss strategies for mitigating these effects by using optimized setups featuring adapted ODT configurations. This includes proposed schemes that may mitigate three-body losses expected at very low temperatures, allowing to access the quantum dominated regime of interaction.

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14

Friedman, Nir, Lev Khaykovich, Roee Ozeri, and Nir Davidson. "Single-Beam Dark Optical Traps for Cold Atoms." Optics and Photonics News 10, no. 12 (December 1, 1999): 36. http://dx.doi.org/10.1364/opn.10.12.000036.

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15

Ram, Surjya Prakash, S. K. Tiwari, and S. R. Mishra. "A Comparison of Pulsed and Continuous Atom Transfer between Two Magneto-optical Traps." Journal of the Korean Physical Society 57, no. 5 (November 15, 2010): 1303–7. http://dx.doi.org/10.3938/jkps.57.1303.

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16

CAZALILLA, M. A., A. F. HO, and T. GIAMARCHI. "DECONFINEMENT AND COLD ATOMS IN OPTICAL LATTICES." International Journal of Modern Physics B 20, no. 30n31 (December 20, 2006): 5169–78. http://dx.doi.org/10.1142/s0217979206036235.

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Despite the fact that by now one dimensional and three dimensional systems of interacting particles are reasonably well understood, very little is known on how to go from the one dimensional physics to the three dimensional one. This is in particular true in a quasi-one dimensional geometry where the hopping of particles between one dimensional chains or tubes can lead to a dimensional crossover between a Luttinger liquid and more conventional high dimensional states. Such a situation is relevant to many physical systems. Recently cold atoms in optical traps have provided a unique and controllable system in which to investigate this physics. We thus analyze a system made of coupled one dimensional tubes of interacting fermions. We explore the observable consequences, such as the phase diagram for isolated tubes, and the possibility to realize unusual superfluid phases in coupled tubes systems.

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17

WU, CONGJUN. "HIDDEN SYMMETRY AND QUANTUM PHASES IN SPIN-3/2 COLD ATOMIC SYSTEMS." Modern Physics Letters B 20, no. 27 (November 30, 2006): 1707–38. http://dx.doi.org/10.1142/s0217984906012213.

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Optical traps and lattices provide a new opportunity to study strongly correlated high spin systems with cold atoms. In this article, we review the recent progress on the hidden symmetry properties in the simplest high spin fermionic systems with hyperfine spin F=3/2, which may be realized with atoms of 132 Cs , 9 Be , 135 Ba , 137 Ba , and 201 Hg . A generic SO(5) or isomorphically, Sp(4) symmetry is proved in such systems with the s-wave scattering interactions in optical traps, or with the on-site Hubbard interactions in optical lattices. Various important features from this high symmetry are studied in the Fermi liquid theory, the mean field phase diagram, and the sign problem in quantum Monte-Carlo simulations. In the s-wave quintet Cooper pairing phase, the half-quantum vortex exhibits the global analogue of the Alice string and non-Abelian Cheshire charge properties in gauge theories. The existence of the quartetting phase, a four-fermion counterpart of the Cooper pairing phase, and its competition with other orders are studied in one-dimensional spin-3/2 systems. We also show that counter-intuitively quantum fluctuations in spin-3/2 magnetic systems are even stronger than those in spin-1/2 systems.

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18

Ji Xian-Ming, Lu Jun-Fa, Mu Ren-Wang, and Yin Jian-Ping. "Array of micro-optical traps for cold atoms or cold molecules using a Damman grating." Acta Physica Sinica 55, no. 7 (2006): 3396. http://dx.doi.org/10.7498/aps.55.3396.

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19

Jicheng Wang, 王继成, 王月媛 Yueyuan Wang, 王跃科 Yueke Wang, 方光宇 Guangyu Fang, and 刘树田 Shutian Liu. "Measurements of total absolute collision cross section of ultracold Rb atom using magneto-optic and pure magnetic traps." Chinese Optics Letters 9, no. 6 (2011): 060201–60204. http://dx.doi.org/10.3788/col201109.060201.

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20

Xian-Ming, Ji, and Yin Jian-Ping. "One- and Two-Dimensional Arrays of Double-Well Optical Traps for Cold Atoms or Molecules." Chinese Physics Letters 21, no. 12 (December 2004): 2399–402. http://dx.doi.org/10.1088/0256-307x/21/12/022.

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21

Yavin, I., T. Mikaelian, and A. Kumarakrishnan. "Calculation of the transfer efficiency between dual magneto-optical traps and simulation of a Ioffe trap for BoseEinstein condensation." Canadian Journal of Physics 81, no. 4 (April 1, 2003): 651–61. http://dx.doi.org/10.1139/p03-050.

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We consider the problem of transferring a cold atomic cloud from a low-vacuum chamber to an ultra-high-vacuum (UHV) chamber, where it can be recaptured and cooled to the transition temperature for BoseEinstein condensation (BEC). Our calculation assumes an initial MaxwellBoltzmann velocity distribution for the thermal cloud and a Gaussian spatial density distribution that is characteristic of magneto-optical traps (MOTs). Using a coordinate transformation we find the density of the recaptured atomic cloud as a function of time. This allows us to investigate the effect of experimental parameters on the transfer efficiency. These parameters include the distance of separation between the two chambers, the duration of the initial on-resonant laser used to push the thermal cloud, and the initial cloud temperature. We also present numerical simulations of the magnetic field due to a simplified IoffePritchard (IP) trap that has recently been used to obtain BEC using laser-cooling techniques. This trap converts a quadrupole magnetic field into an IP configuration using the magnetic field of a conical solenoid placed orthogonally to the axis of symmetry of a pair of quadrupole coils. Our results are suitable for small experimental groups interested in achieving BEC. PACS No.: 03.75

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22

Dolginov, A. Z. "Chemical and Temperature Inhomogeneities on Stellar Surfaces as a Result of an Instability." International Astronomical Union Colloquium 90 (1986): 395–96. http://dx.doi.org/10.1017/s0252921100091855.

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Observations show that chemical anomalies are distributed inhomogeneously on Ap star surfaces. The most elaborated explanation of the observations is based on the fact that different ions and atoms are affected by radiative forces of different strengths and, hence, have different diffusion velocities. The diffusion across the magnetic field is a factor of (l + νH2/νC2)−1 slower than along the field (νH is the gyrofrequency and νC is the collision frequency of the ions). It leads to the increasing of the heavy ion number density in regions occupied by magnetic traps.However, such an explanation meets a number of difficulties: a) the conditions holds for the most of ion species only in regions where the optical depth is less than 10−2 if the field H exceeds 105 gs. Although little is known on the depth of the region occupied by the chemical anomalies, there are some indirect indications that it is larger than 10−2; b) The observed dipole field has a value 103−104 gs and does not form traps corresponding to the observed chemical spots which have very complicated configurations; c) the magnetic trap is imperfect. The separation process in the field is assumed to be produced by the diffusion which needs a long time. However, ions can escape from the trap together with the surrounding hydrogen plasma because of various plasma instablished which take much shorter time; d) observed space distribution of rare elements and also of Fe, Cr, Ti contradicts the predictions of the magnetic separation hypothesis (cf. V. Khohlova IAU Coll. No. 90, this volume).

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23

Boudot, Rodolphe, James P. McGilligan, Kaitlin R. Moore, Vincent Maurice, Gabriela D. Martinez, Azure Hansen, Emeric de Clercq, and John Kitching. "Enhanced observation time of magneto-optical traps using micro-machined non-evaporable getter pumps." Scientific Reports 10, no. 1 (October 6, 2020). http://dx.doi.org/10.1038/s41598-020-73605-z.

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Abstract We show that micro-machined non-evaporable getter pumps (NEGs) can extend the time over which laser cooled atoms can be produced in a magneto-optical trap (MOT), in the absence of other vacuum pumping mechanisms. In a first study, we incorporate a silicon-glass microfabricated ultra-high vacuum (UHV) cell with silicon etched NEG cavities and alumino–silicate glass (ASG) windows and demonstrate the observation of a repeatedly-loading MOT over a 10 min period with a single laser-activated NEG. In a second study, the capacity of passive pumping with laser activated NEG materials is further investigated in a borosilicate glass-blown cuvette cell containing five NEG tablets. In this cell, the MOT remained visible for over 4 days without any external active pumping system. This MOT observation time exceeds the one obtained in the no-NEG scenario by almost five orders of magnitude. The cell scalability and potential vacuum longevity made possible with NEG materials may enable in the future the development of miniaturized cold-atom instruments.

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24

Klempt, C., T. van Zoest, T. Henninger, O. Topic, E. Rasel, W. Ertmer, and J. Arlt. "Ultraviolet light-induced atom desorption for large rubidium and potassium magneto-optical traps." Physical Review A 73, no. 1 (January 24, 2006). http://dx.doi.org/10.1103/physreva.73.013410.

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25

Courtade, Emmanuel, Olivier Houde, Jean-François Clément, Philippe Verkerk, and Daniel Hennequin. "Dark optical lattice of ring traps for cold atoms." Physical Review A 74, no. 3 (September 20, 2006). http://dx.doi.org/10.1103/physreva.74.031403.

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26

Gillen, Glen D., Shekhar Guha, and Katharina Christandl. "Optical dipole traps for cold atoms using diffracted laser light." Physical Review A 73, no. 1 (January 20, 2006). http://dx.doi.org/10.1103/physreva.73.013409.

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27

Torrontegui, E., Xi Chen, M. Modugno, A. Ruschhaupt, D. Guéry-Odelin, and J. G. Muga. "Fast transitionless expansion of cold atoms in optical Gaussian-beam traps." Physical Review A 85, no. 3 (March 5, 2012). http://dx.doi.org/10.1103/physreva.85.033605.

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28

Barfknecht, R. E., T. Mendes-Santos, and L. Fallani. "Engineering entanglement Hamiltonians with strongly interacting cold atoms in optical traps." Physical Review Research 3, no. 1 (February 5, 2021). http://dx.doi.org/10.1103/physrevresearch.3.013112.

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