Counting cold collisions

Ueberholz, B.; Kuhr, Stefan; Frese, Daniel; Meschede, Dieter; Gomer, V.

doi:10.1088/0953-4075/33/4/105

Cited by 28 publications

(29 citation statements)

References 24 publications

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“…In the simulation, one has to choose whether a collision ejects both atoms from the trap, or only one; good agreement with the experiment is obtained by assuming that in the collision both atoms are ejected from the trap (otherwise, we would reach an average number of atoms 0.5 < N < 1, contrary to the experiment). This is also consistent with what is expected from the underlying collisional mechanisms, even if one-atom losses have also been observed in other geometries [12]. In order to get quantitative predictions, one has to introduce numerical values for γ and β .…”

Section: Collisional Blockadesupporting

confidence: 84%

Single Atom Manipulation in a Microscopic Dipole Trap

Reymond¹,

Schlosser²,

Grangier³

2003

The Expanding Frontier of Atomic Physics

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We describe the operation of a very small optical dipole trap that is designed to store and manipulate individual atoms. Due to the very small dipole trap volume, a "collisional blockade" mechanism locks the average number of trapped atoms on the value 0.5 over a large range of loading rates. We demonstrate experimentally the existence of this regime, and we describe also the "weak loading" and "strong loading" regimes outside the blockade range. In addition, we describe methods to measure the oscillation frequencies of a single atom in the trap with a high accuracy, and a "release and recapture" method designed for temperature measurements at the single atom level. The measured "single atom temperature" is 35 µK, that is in the sub-Doppler regime. Finally, by exploiting the extremely high density observed in the strong loading regime, we present preliminary results for evaporative cooling, where typically 30 atoms at 200 µK are forced to evaporate into about 10 atoms at 15 µK.

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Section: Collisional Blockadesupporting

confidence: 84%

Single Atom Manipulation in a Microscopic Dipole Trap

Reymond¹,

Schlosser²,

Grangier³

2003

The Expanding Frontier of Atomic Physics

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“…Typically, cold atoms are loaded into a FORT from a MOT, which utilizes red-detuned light beams. Studies of individual collisional loss events in a MOT with high gradient magnetic field has shown that about 10 percent of collisional loss events are 2 − 1 loss [48].…”

Section: Two-atom Light-assisted Collisions Induced By Red-detuned Lightmentioning

confidence: 99%

Single Atoms Preparation Using Light-Assisted Collisions

2016

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Abstract:The detailed control achieved over single optically trapped neutral atoms makes them candidates for applications in quantum metrology and quantum information processing. The last few decades have seen different methods developed to optimize the preparation efficiency of single atoms in optical traps. Here we review the near-deterministic preparation of single atoms based on light-assisted collisions and describe how this method can be implemented in different trap regimes. The simplicity and versatility of the method makes it feasible to be employed in future quantum technologies such as a quantum logic device.

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“…When N 2 = 0, we recover the phenomenological equation sometimes used to describe the loading of a trap containing a small number of atoms [21,24], i.e., dN/dt = R − γ N − β N (N − 1). When N 2 = N (i.e., assuming a Poisson distribution), Eq.…”

mentioning

confidence: 99%

Sub-Poissonian atom-number fluctuations using light-assisted collisions

et al. 2012

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We investigate experimentally the number statistics of a mesoscopic ensemble of cold atoms in a microscopic dipole trap loaded from a magneto-optical trap and find that the atom-number fluctuations are reduced with respect to a Poisson distribution due to light-assisted two-body collisions. For numbers of atoms N 2, we measure a reduction factor (Fano factor) of 0.72 ± 0.07, which differs from 1 by more than four standard deviations. We analyze this fact by a general stochastic model describing the competition between the loading of the trap from a reservoir of cold atoms and multiatom losses, leading to a master equation. Applied to our experimental regime, this model indicates an asymptotic value of 3/4 for the Fano factor at large N and in the steady state. We thus show that we have reached the ultimate level of reduction in number fluctuations in our system.

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Counting cold collisions

Cited by 28 publications

References 24 publications

Single Atom Manipulation in a Microscopic Dipole Trap

Single Atom Manipulation in a Microscopic Dipole Trap

Single Atoms Preparation Using Light-Assisted Collisions

Sub-Poissonian atom-number fluctuations using light-assisted collisions

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