Dynamic manipulation of Bose-Einstein condensates with a spatial light modulator

Boyer, Vincent; Godun, R. M.; Smirne, G.; Cassettari, Donatella; Chandrashekar, C. M.; Deb, Amita B.; Laczik, Z.; Foot, C. J.

doi:10.1103/physreva.73.031402

Cited by 123 publications

(99 citation statements)

References 23 publications

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“…In this context, arbitrary time-dependent optical trapping potentials are particularly appealing, with a variety of geometries including toroids and ring lattices already realised by acousto-optic or holographic means [3,4]. Experiments have been performed with discrete arrays of optical dipole traps, loaded with either thermal atoms [4,5] or quantum degenerate atomic gases [3,6,7], in which individual trapping sites can be moved, addressed and manipulated. Important too are continuous trapping geometries: the primary subject of the present work are extended (as opposed to diffractionlimited) power-law potentials, proposed both as a static supplement to a trapping potential to cancel unwanted external potentials [8], and in a dynamic sequence as a tool for the efficient production of Bose-Einstein condensates [9].…”

Section: Introductionmentioning

confidence: 99%

“…Technologies employed so far in the realisation of these arbitrary optical trapping patterns include acousto-optic deflection of a laser beam to produce either a composite static intensity distribution [8] or a rapidly-scanned profile [3,7,11], digital micro-mirror devices (DMDs) [4], and computer-generated holograms implemented with phase-only spatial light modulators (SLMs) [5,6,9,10,[12][13][14][15]. The high phase-resolution available in phase-only SLMs offers significant advantages for versatility of the accessible trapping patterns, though at the cost of lower switching speed between frames if compared to acousto-optic modulators and digital mirror devices.…”

Section: Introductionmentioning

confidence: 99%

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Conjugate gradient minimisation approach to generating holographic traps for ultracold atoms

Harte¹,

Bruce²,

Keeling³

et al. 2014

Opt. Express

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Direct minimisation of a cost function can in principle provide a versatile and highly controllable route to computational hologram generation. However, to date iterative Fourier transform algorithms have been predominantly used. Here we show that the careful design of cost functions, combined with numerically efficient conjugate gradient minimisation, establishes a practical method for the generation of holograms for a wide range of target light distributions. This results in a guided optimisation process, with a crucial advantage illustrated by the ability to circumvent optical vortex formation during hologram calculation. We demonstrate the implementation of the conjugate gradient method for both discrete and continuous intensity distributions and discuss its applicability to optical trapping of ultracold atoms. References and links1. I. Bloch, J. Dalibard, and S. Nascimbene, "Quantum simulations with ultracold quantum gases," Nat Phys 8, 267-276 (2012). 2. A. D. Cronin, J. Schmiedmayer, and D. E. Pritchard, "Optics and interferometry with atoms and molecules," Rev.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Conjugate gradient minimisation approach to generating holographic traps for ultracold atoms

Harte¹,

Bruce²,

Keeling³

et al. 2014

Opt. Express

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“…This results in a phase evolution of the masked relative to the unmasked part of the condensate of ∆φ = U dip t/(i ). The pattern is generated by a spatial light modulator (SLM) with an effective pixel size of 0.8 µm allowing for almost arbitrary optical potentials [33]. To imprint a phase slip of order π, we choose a pulse time t π = 40 µs, much smaller than the correlation time τ corr =ξ/c s = 700 µs for our experimental parameters to avoid a simultaneous disturbance of the atomic density.…”

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confidence: 99%

Oscillations and interactions of dark and dark–bright solitons in Bose–Einstein condensates

et al. 2008

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Solitons are among the most distinguishing fundamental excitations in a wide range of non-linear systems such as water in narrow channels, high speed optical communication, molecular biology and astrophysics. Stabilized by a balance between spreading and focusing, solitons are wavepackets, which share some exceptional generic features like form-stability and particle-like properties. Ultracold quantum gases represent very pure and well-controlled non-linear systems, therefore offering unique possibilities to study soliton dynamics. Here we report on the first observation of long-lived dark and dark-bright solitons with lifetimes of up to several seconds as well as their dynamics in highly stable optically trapped 87 Rb Bose-Einstein condensates. In particular, our detailed studies of dark and dark-bright soliton oscillations reveal the particle-like nature of these collective excitations for the first time. In addition, we discuss the collision between these two types of solitary excitations in Bose-Einstein condensates. The dynamics of non-linear systems plays an essential role in nature, ranging from strong non-linear interactions of elementary particles to non-linear wave phenomena in oceanography and meteorology. A special class of non-linear phenomena are solitons with interesting particle and wave-like behaviour. Reaching back to the observation of "waves of translation" in a narrow water channel by Scott-Russell in 1834 [1], solitons are nowadays recognized to appear in various systems as different as astrophysics, molecular biology and non-linear optics [2]. They are characterized as localized solitary wavepackets that maintain their shape and amplitude caused by a self-stabilization against dispersion via a non-linear interaction. While an early theoretical explanation of this non-dispersive wave phenomenon was given by Korteweg and de Vries in the late 19th century it was not before 1965 that numerical simulations of Zabusky and Kruskal theoretically proved that these solitary waves preserve their identity in collisions [3,4]. This revelation led to the term "soliton" for this type of collective excitation. Nowadays solitons are a very active field of research in many areas of science. In the field of non-linear optics they attract enormous attention due to applications in fast data transfer. Bose-Einstein condensates (BEC) of weakly interacting atoms offer fascinating possibilities for the study of nonlinear phenomena, as they are very pure samples of ultracold gases building up an effective macroscopic wave function of up to mm size. Non-linear effects like collective excitations [5], four-wave mixing [6] and vortices [7,8] have been studied, to name only a few examples. The existence and some fundamental properties of solitons have been deduced from few experiments employing ultra-cold quantum gases. Bright solitons, characterized as non-spreading matter-wave packets, have been observed in BEC with attractive interaction [9,10,11] where they represent the ground state of the system. In a repulsively...

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“…Additional flexibility in the implementation of future generations of quantum processors can be expected through the continuous advance in micro-and nano-optics. As one example for these exciting new developments, we would like to mention the application of spatially resolved light modulators for the flexible and dynamically reconfigurable generation of multiple light fields www.lpr-journal.org for atom trapping [1,3]. In such a configuration, it is possible to move atoms within dipole traps with high flexibility, to combine and separate traps, and to implement complex quantum operations.…”

Section: Figurementioning

confidence: 99%

Micro traps for quantum information processing and precision force sensing

Birkl

Fortágh

2007

Laser & Photonics Reviews

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Abstract:We review recent experimental progress towards quantum information processing and precision force sensing using neutral atoms in micro traps. Microscopic potential structures as generated by optical or electronic microstructures (micro traps) allow for a versatile manipulation of quantum states of atoms and of ultracold atomic quantum gases. Most recent experimental results include the implementation of single-qubit-operations in both, optical and magnetic micro traps, as well as in the demonstration of matter-wave interferometer using Bose-Einstein condensates coherently split in micro traps.

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Dynamic manipulation of Bose-Einstein condensates with a spatial light modulator

Cited by 123 publications

References 23 publications

Conjugate gradient minimisation approach to generating holographic traps for ultracold atoms

Conjugate gradient minimisation approach to generating holographic traps for ultracold atoms

Oscillations and interactions of dark and dark–bright solitons in Bose–Einstein condensates

Micro traps for quantum information processing and precision force sensing

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