Evaporative cooling of a small number of atoms in a single-beam microscopic dipole trap

Bourgain, Ronan; Pellegrino, Joseph G.; Fuhrmanek, Andreas; Sortais, Yvan R. P.; Browaeys, Antoine

doi:10.1103/physreva.88.023428

Cited by 32 publications

(33 citation statements)

References 39 publications

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“…The renewed interest in the theoretical research on systems of a few trapped ultracold bosons or fermions is strongly related to the recent experimental achievements in this direction [1][2][3][4][5][6]. In the pioneering works in this topic, the energy spectra of two trapped atoms was obtained analytically [7,8].…”

Section: Introductionmentioning

confidence: 99%

Distinguishability, degeneracy, and correlations in three harmonically trapped bosons in one dimension

et al. 2014

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We study a system of two bosons of one species and a third atom of a second species in a one-dimensional parabolic trap at zero temperature. We assume contact repulsive inter-and intraspecies interactions. By means of an exact diagonalization method we calculate the ground and excited states for the whole range of interactions. We use discrete group theory to classify the eigenstates according to the symmetry of the interaction potential. We also propose and validate analytical Ansätze gaining physical insight over the numerically obtained wave functions. We show that, for both approaches, it is crucial to take into account that the distinguishability of the third atom implies the absence of any restriction over the wave function when interchanging this boson with any of the other two. We find that there are degeneracies in the spectra in some limiting regimes, that is, when the interspecies and/or the intraspecies interactions tend to infinity. This is in contrast with the three-identical boson system, where no degeneracy occurs in these limits. We show that, when tuning both types of interactions through a protocol that keeps them equal while they are increased towards infinity, the systems's ground state resembles that of three indistinguishable bosons. Contrarily, the systems's ground state is different from that of three-identical bosons when both types of interactions are increased towards infinity through protocols that do not restrict them to be equal. We study the coherence and correlations of the system as the interactions are tuned through different protocols, which permit us to build up different correlations in the system and lead to different spatial distributions of the three atoms.

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Section: Introductionmentioning

confidence: 99%

Distinguishability, degeneracy, and correlations in three harmonically trapped bosons in one dimension

et al. 2014

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“…These microscopic dipole traps, so-called microtraps, enable the generation of atomic samples of very high density at modest atom number and temperature. Such a system holds the potential for generating microscopic Bose Einstein condensates [1]. Additionally, the use of Rydberg states within these small and dense atomic ensembles has applications in quantum information, such as the realization of collective qubits [2] and non-linear absorption and dispersion of light through collisions between Rydberg atoms [3,4].…”

Section: Introductionmentioning

confidence: 99%

In-trap fluorescence detection of atoms in a microscopic dipole trap

et al. 2015

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We investigate fluorescence detection using a standing wave of blue-detuned light of one or more atoms held in a deep, microscopic dipole trap. The blue-detuned standing wave realizes a Sisyphus laser cooling mechanism so that an atom can scatter many photons while remaining trapped. When imaging more than one atom, the blue detuning limits loss due to inelastic light-assisted collisions. Using this standing wave probe beam, we demonstrate that we can count from one to the order of 100 atoms in the microtrap with sub-poissonian precision.

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“…A prominent example is the so-called Tonks-Girardeau (TG) gas [2,3] of impenetrable bosons in one dimension (1D) that has been created using cold atoms [4][5][6][7]. An exciting recent advance in this direction is the ability to produce and manipulate low-dimensional samples with controllable particle numbers down to single digits [8][9][10][11][12]. These developments show that fewbody systems with bosons and fermions in microtraps that can be manipulated and studied in great detail can be achieved with ultracold atoms.…”

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confidence: 99%

Fractional energy states of strongly interacting bosons in one dimension

Zinner¹,

Volosniev²,

Fedorov³

et al. 2014

EPL

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-We study two-component bosonic systems with strong inter-species and vanishing intra-species interactions. A new class of exact eigenstates is found with energies that are not sums of the single-particle energies with wave functions that have the characteristic feature that they vanish over extended regions of coordinate space. This is demonstrated in an analytically solvable model for three equal mass particles, two of which are identical bosons, which is exact in the strongly-interacting limit. We numerically verify our results by presenting the first application of the stochastic variational method to this kind of system. We also demonstrate that the limit where both inter-and intra-component interactions become strong must be treated with extreme care as these limits do not commute. Moreover, we argue that such states are generic also for general multi-component systems with more than three particles. The states can be probed using the same techniques that have recently been used for fermionic few-body systems in quasi-1D.Introduction. -Ultracold atomic gas experiments have proven an invaluable tool for realizing stronglycorrelated quantum mechanical systems in highly tunable environments [1]. A prominent example is the so-called Tonks-Girardeau (TG) gas [2,3] of impenetrable bosons in one dimension (1D) that has been created using cold atoms [4][5][6][7]. An exciting recent advance in this direction is the ability to produce and manipulate low-dimensional samples with controllable particle numbers down to single digits [8][9][10][11][12]. These developments show that fewbody systems with bosons and fermions in microtraps that can be manipulated and studied in great detail can be achieved with ultracold atoms. These systems would facilitate access to strongly correlated states with applications in quantum information, computation, and atomtronics [13][14][15][16][17][18][19].

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Evaporative cooling of a small number of atoms in a single-beam microscopic dipole trap

Cited by 32 publications

References 39 publications

Distinguishability, degeneracy, and correlations in three harmonically trapped bosons in one dimension

Distinguishability, degeneracy, and correlations in three harmonically trapped bosons in one dimension

In-trap fluorescence detection of atoms in a microscopic dipole trap

Fractional energy states of strongly interacting bosons in one dimension

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