The trapping and detection of single atoms using a spherical mirror

Roy, Amartya; Jing, Andrew Bah Shen; Barrett, M. D.

doi:10.1088/1367-2630/14/9/093007

Cited by 10 publications

(11 citation statements)

References 15 publications

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“…This can enhance the the single atom loading efficiency beyond 50% in the case of loading with red-detuned light only. This has been observed in [36], where the efficiency is 63% and similar effects have been observed in [20,50,51].…”

Section: Loading Single Atom Without Blue-detuned Induced Collision Beamsupporting

confidence: 82%

“…Reference [52] mentioned that repulsive light-assisted collisions played a role in their loading of single Cs atoms into an array of blue-detuned FORTs with an efficiency of about 70%. Figure 19 shows some examples of works that used light-assisted collisions as an approach to prepare a single atom [20,30,31,33,35,36,[50][51][52][53]. Repulsive light-assisted collisions that favours the 2 − 1 loss channel generally results in higher preparation efficiency across different trap sizes and atomic species.…”

Section: Summary and Future Directionsmentioning

confidence: 99%

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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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Section: Loading Single Atom Without Blue-detuned Induced Collision Beamsupporting

confidence: 82%

Section: Summary and Future Directionsmentioning

confidence: 99%

Single Atoms Preparation Using Light-Assisted Collisions

2016

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“…A similar loading probability has in the past been observed in the collisional blockade regime [25] and is explained by a non-zero p 2 1 → from collisions induced by MOT light [22]. Additionally, several groups have employed a non-zero p 2 1 → from collisions induced by MOT light to isolate individual atoms from small samples with loading probabilities exceeding 60%, see [22,26] and the supplementary material of [9]. In our present experiment, runs yielded either zero or one atom, confirming that the light-assisted collisions induced by the MOT lasers alone put us in the collisional blockade regime.…”

Section: Loading Of One Atom Into a Tight Microtrapsupporting

confidence: 59%

Efficient collisional blockade loading of a single atom into a tight microtrap

Fung

Andersen

2015

New J. Phys.

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We show that controlled inelastic collisions can improve the single atom loading efficiency in the collisional blockade regime of optical microtraps. A collisional loss process where only one of the colliding atoms is lost, implemented during loading, enables us to kick out one of the atoms as soon as a second atom enters the optical microtrap. When this happens faster than the pair loss, which has limited the loading efficiency of previous experiments to about 50%, we experimentally observe an enhancement to 80%. A simple analytical theory predicts the loading dynamics. Our results open up an efficient and fast route for loading individual atoms into optical tweezers and arrays of microtraps that are too tight for easy implementation of the method reported in [1,2]. The loading of tight traps with single atoms is a requirement for their applications in future experiments in quantum information processing and few-body physics.

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“…The importance of this new method at large values of Φ can be seen in the divergence of the two functions. The variance of ffi = ffi 0 cos(Ωt) is ffi 2 0 /2, so we plot J n ( √ 2Φ) 2 18 The forms of the potentials in the quadratic and non-linear case. Particles with different energies explore different spatial extents and so are subject to differing restoring forces.…”

Section: 11mentioning

confidence: 99%

“…The size and mass scales of these systems vary enormously, from single atoms [18] with a size (effective size in the case of individual atoms) of 10 −10 m, to the 10 0 m wide LIGO mirrors that are used to detect oscillation amplitudes of 10 −19 m [19]. These different size scales give vastly different characteristic properties, and their research and development is undertaken with different goals in mind.…”

Section: Chapter 1 Introduction §12 What Is Levitated Optomechanics?mentioning

confidence: 99%

Spectral Analysis and Parameter Estimation in Fibre Levitated Optomechanics

Dawson¹

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In levitated optomechanics, nano-scale objects are optically trapped so that their motion can be studied. These trapped nanoparticles are held in a 3D quadratic potential and act as damped harmonic oscillators; they are thermally and mechanically decoupled from the apparatus and their position is measured interfer-ometrically to picometre accuracy. These systems are well suited to sensing and metrology applications, as any external disturbance of the particle can be observed using the scattered trapping light.When examining the motion of a levitated nanoparticle, it’s position is recorded and used to estimate a power spectral density (PSD), from which state parameters can be estimated. In this thesis an experi-mental setup is presented, optimised for maximum collection of particle position information in 1D, using a ﬁbre-based parabolic mirror trap and heterodyne measurement system in order to produce spectra with minimal noise and unwanted artefacts.A novel application of the Middleton expansion from RF engineering is used to generate a complete power spectrum that depends on the physical parameters of the system. This method treats the particle as a stochastic harmonic oscillator, phase modulated by a Gaussian random process with known PSD. We reproduce the PSD of intensity at a detector, a quantity that is sinusoidally dependent on particle posi-tion. This technique generates a single, full PSD using modiﬁed Bessel functions, and does not depend on assumptions about the relative phases of the interfered ﬁelds, highlighting the non-linear dependence of measured signal on position. Theoretical spectra are ﬁtted to a measured PSD and the phase modulation depth is extracted; this is used to calculate the particle oscillation amplitude and, by an equipartition ar-gument, the centre of mass temperature to mass ratio. State parameters are tracked as environmental conditions change and an increase in centre of mass temperature as a function of decreasing background gas pressure is observed.

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The trapping and detection of single atoms using a spherical mirror

Cited by 10 publications

References 15 publications

Single Atoms Preparation Using Light-Assisted Collisions

Single Atoms Preparation Using Light-Assisted Collisions

Efficient collisional blockade loading of a single atom into a tight microtrap

Spectral Analysis and Parameter Estimation in Fibre Levitated Optomechanics

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