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-enhanced gray-molasses cooling of cesium atoms on the 
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Hsiao, Ya-Fen; Lin, Yu-Ju; Chen, Ying-Cheng

doi:10.1103/physreva.98.033419

Cited by 23 publications

(11 citation statements)

References 26 publications

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“…Remarkably, the distance between the maximum and the minimum is much smaller than Γ as in similar work with Cs atoms [24], but in contrast with Ref. [6].…”

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confidence: 52%

Loading and cooling in an optical trap via hyperfine dark states

Naik

Eneriz-imaz

Carey

et al. 2020

Phys. Rev. Research

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We present a novel optical cooling scheme that relies on hyperfine dark states to enhance loading and cooling atoms inside deep optical dipole traps. We demonstrate a seven-fold increase in the number of atoms loaded in the conservative potential with strongly shifted excited states. In addition, we use the energy selective dark-state to efficiently cool the atoms trapped inside the conservative potential rapidly and without losses. Our findings open the door to optically assisted cooling of trapped atoms and molecules which lack the closed cycling transitions normally needed to achieve low temperatures and the high initial densities required for evaporative cooling.Ultra-cold quantum gases have attracted much attention in recent decades as versatile platforms for investigating strongly correlated quantum systems [1] and as the basis for a new class of quantum technologies based on atomic interferometry [2,3]. Cooling of an atomic gas to the required temperatures requires a multi-stage process: laser cooling in a magneto-optical trap (MOT); sub-Doppler cooling; loading into a conservative magnetic or optical trap; evaporative cooling. Although quite efficient, this process is only possible for a small subset of alkali and alkali-earth-like atoms that can be initially cooled to low temperature by optical means.The sub-Doppler cooling phase typically uses light red detuned from the F → F = F + 1 cycling transition of a D 2 line nS 1/2 → nP 3/2 [4], and can be understood in terms of the "Sisyphus effect" [5][6][7][8]. Sub-Doppler cooling schemes involving dark states (DSs) [9] have emerged as a powerful alternative; they are known as gray molasses. Very recently they have been pivotal in obtaining an alloptical BEC in microgravity [10] and a degenerate Fermi gas of polar molecules [11]. The DSs are coherent superpositions of internal and external (momentum) states that are decoupled from the optical field; their creation does not require cycling F → F = F + 1 transitions, but can rely on any transitions of the F → F ≤ F form.To prevent the expansion of the cold atom cloud during cooling, it is tempting to combine DS sub-Doppler cooling with spatial confinement in a far-off-resonance optical dipole trap (FORT). However, the DSs are then strongly modified by the trap potential, which typically shortens their lifetime and eventually couples them to the light field.In this letter, we show that DS cooling can be used in combination with FORT when strong differential light * devang.naik@institutoptique.fr † andrea.bertoldi@institutoptique.fr shift are present. We use the effect of FORT trapping light close the 5P 3/2 → 4D 3/2;5/2 transitions of rubidium at 1529 nm [12,13] to maximize the cooling action on the surrounding of the trap and at its borders. We observe an order of magnitude improvement in the number of trapped atoms. Additionally, we explore the possibility of cooling the atomic ensemble in the FORT. We achieve a notable temperature reduction of the trapped sample in a few ms and without losing atoms and analyz...

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“…Remarkably, the distance between the maximum and the minimum is much smaller than Γ as in similar work with Cs atoms [24], but in contrast with Ref. [6].…”

mentioning

confidence: 52%

Loading and cooling in an optical trap via hyperfine dark states

Naik

Eneriz-imaz

Carey

et al. 2020

Phys. Rev. Research

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show abstract

“…Our atomic quantum memory is based on a magnetooptical trap (MOT) of cesium [39]. We typically trap ∼4 × 10 8 cold atoms with a temperature of 180 μK.…”

Section: Methodsmentioning

confidence: 99%

Quantum storage and manipulation of heralded single photons in atomic memories based on electromagnetically induced transparency

Tsai

Hsiao

Chen

2020

Phys. Rev. Research

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We demonstrate the storage and manipulation of heralded single photons generated from a cavity-enhanced spontaneous parametric down-conversion (SPDC) source in the atomic quantum memory based on electromagnetically induced transparency. We show that nonclassical correlations are preserved between the heralding and the retrieved photons after storage process. By varying the intensity of the coupling field during retrieval process, we further demonstrate that the waveform or bandwidth of the single photons can be manipulated and the reduction of the nonclassical correlation between the photon pairs can be compensated. Our SPDC photon pairs are generated in a single pair of longitudinal cavity modes, which not only reduces the experimental complexity arising from external filtering but also increases the useful photon generation rate. Our results can be scaled up with ease and thus lay the foundation for future realization of large-scale applications in quantum information processing.

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“…The presence of two independent electron-nuclear spin angular momentum states in the molecular ground state provides two quasiindependent paths for efficient GMC, along with robust dual-frequency DC magneto-optical trapping (MOT). The GMC-based approach provides the lowest lasercooled molecular temperature of 4 µK over a broad range of laser tuning and magnetic field (B), such that exciting a Raman resonance does not bring further cooling, in contrast to previous reports [61,[71][72][73][74][75][76][77]. GMC is known to be magnetic field insensitive [78][79][80], and this insensitivity is further enhanced in YO molecules by the existence of a ground state manifold with a negligible Landé g-factor.…”

Section: Introductionmentioning

confidence: 97%

Sub-Doppler Cooling and Compressed Trapping of YO Molecules at $μ$K Temperatures

Ding,

Wu,

Finneran

et al. 2020

Preprint

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Complex molecular structure demands customized solutions to laser cooling by extending its general set of principles and practices. Yttrium monoxide (YO) has unique intramolecular interactions. The Fermi-contact interaction dominates over the spin-rotation coupling, resulting in two manifolds of closely spaced states, with one of them possessing a negligible Landé g-factor. This unique energy level structure favors dual-frequency DC magneto-optical trapping (MOT) and gray molasses cooling (GMC). We report exceptionally robust cooling of YO at 4 µK over a wide range of laser intensity, detunings (one and two-photon), and magnetic field. The magnetic insensitivity enables the spatial compression of the molecular cloud by alternating GMC and MOT under the continuous operation of the quadrupole magnetic field. A combination of these techniques produces a laser-cooled molecular sample with the highest phase space density in free space.

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Λ -enhanced gray-molasses cooling of cesium atoms on the D2 line

Cited by 23 publications

References 26 publications

Loading and cooling in an optical trap via hyperfine dark states

Loading and cooling in an optical trap via hyperfine dark states

Quantum storage and manipulation of heralded single photons in atomic memories based on electromagnetically induced transparency

Sub-Doppler Cooling and Compressed Trapping of YO Molecules at $μ$K Temperatures

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