Long-distance channeling of cold atoms exiting a 2D magneto-optical trap by a Laguerre–Gaussian laser beam

Carrat, Vincent; Cabrera-Gutiérrez, Citlali; Jacquey, Marion; Tabosa, J. W. R.; Lesegno, B. Viaris de; Pruvost, Laurence

doi:10.1364/ol.39.000719

“…We propose to radially trap the rubidium atoms along the OX axis ( Fig. 1) by a 0.5 W, 1 µm-wavelength hollow beam in a (0,1) Laguerre-Gauss (LG) mode focused to a 7 µm waist [146]. The transverse trapping frequencies are then ω Y = ω Z = 2π × 12 kHz.…”

Section: B Circular Atom Trappingmentioning

confidence: 99%

Towards Quantum Simulation with Circular Rydberg Atoms

Nguyen

¹

,

Raimond

²

,

Sayrin

³

et al. 2018

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The main objective of quantum simulation is an in-depth understanding of many-body physics, which is important for fundamental issues (quantum phase transitions, transport, …) and for the development of innovative materials. Analytic approaches to many-body systems are limited, and the huge size of their Hilbert space makes numerical simulations on classical computers intractable. A quantum simulator avoids these limitations by transcribing the system of interest into another, with the same dynamics but with interaction parameters under control and with experimental access to all relevant observables. Quantum simulation of spin systems is being explored with trapped ions, neutral atoms, and superconducting devices. We propose here a new paradigm for quantum simulation of spin-1=2 arrays, providing unprecedented flexibility and allowing one to explore domains beyond the reach of other platforms. It is based on laser-trapped circular Rydberg atoms. Their long intrinsic lifetimes, combined with the inhibition of their microwave spontaneous emission and their low sensitivity to collisions and photoionization, make trapping lifetimes in the minute range realistic with state-of-the-art techniques. Ultracold defect-free circular atom chains can be prepared by a variant of the evaporative cooling method. This method also leads to the detection of arbitrary spin observables with single-site resolution. The proposed simulator realizes an XXZ spin-1=2 Hamiltonian with nearest-neighbor couplings ranging from a few to tens of kilohertz. All the model parameters can be dynamically tuned at will, making a large range of simulations accessible. The system evolution can be followed over times in the range of seconds, long enough to be relevant for ground-state adiabatic preparation and for the study of thermalization, disorder, or Floquet time crystals. The proposed platform already presents unrivaled features for quantum simulation of regular spin chains. We discuss extensions towards more general quantum simulations of interacting spin systems with full control on individual interactions.

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“…Optical dipole traps can be moulded into desired geometries by shaping the light field appropriately. Laguerre-Gauss (LG) modes and their superpositions provide a particularly suitable basis for cylindrically symmetric trapping configurations [4][5][6][7][8], including torroidal traps or ring lattices [9][10][11][12][13][14], for which the optical vortices of blue-detuned trapping light offer a guaranteed intensity null, and waveguides [15][16][17][18][19] and nanofibres [20][21][22][23][24][25][26].…”

Section: Orbital Angular Momentum Beams For Trapping and Guiding Geommentioning

confidence: 99%

“…At the centre of a bluedetuned LG beam, atoms are confined along the transverse direction by the optical dipole force but can freely move along the vortex core. This has been demonstrated by loading Rb atoms from a hybrid trap into a waveguide [15], and more recently by guiding atoms from a two-dimensional MOT via a hollow blue-detuned LG beam over a distance of 30 cm, which increased the atom flux at the exit of the waveguide by a factor of 200 compared with light travelling through free space [16].…”

Section: (B) Orbital Angular Momentum-based Waveguidesmentioning

confidence: 99%

Optical angular momentum and atoms

Franke‐Arnold

¹

2017

Phil. Trans. R. Soc. A.

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Any coherent interaction of light and atoms needs to conserve energy, linear momentum and angular momentum. What happens to an atom's angular momentum if it encounters light that carries orbital angular momentum (OAM)? This is a particularly intriguing question as the angular momentum of atoms is quantized, incorporating the intrinsic spin angular momentum of the individual electrons as well as the OAM associated with their spatial distribution. In addition, a mechanical angular momentum can arise from the rotation of the entire atom, which for very cold atoms is also quantized. Atoms therefore allow us to probe and access the quantum properties of light's OAM, aiding our fundamental understanding of light-matter interactions, and moreover, allowing us to construct OAM-based applications, including quantum memories, frequency converters for shaped light and OAM-based sensors.This article is part of the themed issue 'Optical orbital angular momentum'.

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“…We propose to radially trap the rubidium atoms along the OX axis ( Fig. 1) by a 0.5-W, 1-μm-wavelength hollow beam in a (0,1) Laguerre-Gauss (LG) mode focused to a 7-μm waist [146]. The transverse trapping frequencies are then ω Y ¼ ω Z ¼ 2π × 12 kHz.…”

Section: B Circular Atom Trappingmentioning

confidence: 99%

Towards quantum simulations with circular Rydberg atoms

Nguyen

¹

,

Cantat-Moltrecht

²

,

Cortiñas

³

et al. 2017

2017 Conference on Lasers and Electro-Optics Europe &Amp; European Quantum Electronics Conference (CLEO/Europe-EQEC)

1

0

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The main objective of quantum simulation is an in-depth understanding of many-body physics, which is important for fundamental issues (quantum phase transitions, transport, …) and for the development of innovative materials. Analytic approaches to many-body systems are limited, and the huge size of their Hilbert space makes numerical simulations on classical computers intractable. A quantum simulator avoids these limitations by transcribing the system of interest into another, with the same dynamics but with interaction parameters under control and with experimental access to all relevant observables. Quantum simulation of spin systems is being explored with trapped ions, neutral atoms, and superconducting devices. We propose here a new paradigm for quantum simulation of spin-1=2 arrays, providing unprecedented flexibility and allowing one to explore domains beyond the reach of other platforms. It is based on laser-trapped circular Rydberg atoms. Their long intrinsic lifetimes, combined with the inhibition of their microwave spontaneous emission and their low sensitivity to collisions and photoionization, make trapping lifetimes in the minute range realistic with state-of-the-art techniques. Ultracold defect-free circular atom chains can be prepared by a variant of the evaporative cooling method. This method also leads to the detection of arbitrary spin observables with single-site resolution. The proposed simulator realizes an XXZ spin-1=2 Hamiltonian with nearest-neighbor couplings ranging from a few to tens of kilohertz. All the model parameters can be dynamically tuned at will, making a large range of simulations accessible. The system evolution can be followed over times in the range of seconds, long enough to be relevant for ground-state adiabatic preparation and for the study of thermalization, disorder, or Floquet time crystals. The proposed platform already presents unrivaled features for quantum simulation of regular spin chains. We discuss extensions towards more general quantum simulations of interacting spin systems with full control on individual interactions.

show abstract

Long-distance channeling of cold atoms exiting a 2D magneto-optical trap by a Laguerre–Gaussian laser beam

Cited by 21 publications

References 17 publications

Towards Quantum Simulation with Circular Rydberg Atoms

Towards Quantum Simulation with Circular Rydberg Atoms

Optical angular momentum and atoms

Towards quantum simulations with circular Rydberg atoms

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