A multi-state interferometer on an atom chip

Petrovic, Jovana; Herrera, I.; Lombardi, Pietro; Schäfer, F.; Cataliotti, F. S.

doi:10.1088/1367-2630/15/4/043002

Cited by 40 publications

(44 citation statements)

References 42 publications

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“…A small current flowing through nanofabricated wires on the substrate produces a magnetic field gradient in such a way that cold atoms can be trapped very close to the surface. Because the layout of the nanowires can be chosen during the chip's production process, atom chips have been used in many cold-atom experiments to produce microtraps, interferometers, and waveguides [12,[14][15][16]. Here we will take advantage of this versatility to consider waveguides in the geometry indicated in Fig.…”

Section: Atom Chipsmentioning

confidence: 99%

Coherent transport by adiabatic passage on atom chips

et al. 2013

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Adiabatic techniques offer some of the most promising tools for achieving high-fidelity control of the center-of-mass degree of freedom of single atoms. Because the main requirement of these techniques is to follow an eigenstate of the system, constraints on timing and field strength stability are usually low, especially for trapped systems. In this paper we present a detailed example of a technique to adiabatically transport a single atom between different waveguides on an atom chip. To ensure that all conditions are fulfilled, we carry out fully three-dimensional simulations of the system, using experimentally realistic parameters. We also detail our method for simulating the system in very reasonable time scales on a consumer desktop machine by leveraging the power of graphics-processing-unit computing

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Section: Atom Chipsmentioning

confidence: 99%

Coherent transport by adiabatic passage on atom chips

et al. 2013

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“…studied the diffuse reflection of a BEC from a rough evanescent wave mirror [40]. Motivated by the crucial relevance of gravito-optical surface traps in atomic waveguides [41,42,43] and atomic chips [44,45,46,47], in this paper we study the special case of a quasi one-dimensional Bose-Einstein condensate which is trapped orthogonal to the prism surface along the vertical axis. In our proposed model the downward pull of gravity is compensated by an exponentially decaying evanescent wave (EW), which can be thought of as a mirror as it repels the atoms upward against gravity as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Quasi one-dimensional Bose–Einstein condensate in a gravito-optical surface trap

Akram¹,

Girodias²,

Pelster³

2016

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. We study both static and dynamic properties of a weakly interacting BoseEinstein condensate (BEC) in a quasi one-dimensional gravito-optical surface trap, where the downward pull of gravity is compensated by the exponentially decaying potential of an evanescent wave. First, we work out approximate solutions of the Gross-Pitaevskii equation for both a small number of atoms using a Gaussian ansatz and a larger number of atoms using the Thomas-Fermi limit. Then we confirm the accuracy of these analytical solutions by comparing them to numerical results. From there, we numerically analyze how the BEC cloud expands non-ballistically, when the confining evanescent laser beam is shut off, showing agreement between our theoretical and previous experimental results. Furthermore, we analyze how the BEC cloud expands non-ballistically due to gravity after switching off the evanescent laser field in the presence of a hard-wall mirror which we model by using a blue-detuned far-off-resonant sheet of light. There we find that the BEC shows significant self-interference patterns for a large number of atoms, whereas for a small number of atoms, a revival of the BEC wave packet with few matter-wave interference patterns is observed.

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“…The RF fields for evaporation and manipulation of the Zeeman states are produced by two additional conductors also integrated on the atom chip. Finally the homogeneous bias field that lifts the degeneracy between the spin orientations is created by two further external Helmholtz coils [10,30].…”

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confidence: 99%

“…they have varying distances from the initial state. Let us stress that these states cannot be prepared by simply using constant pulses [30]. State error preparation as a function of pulse length T , obtained theoretically (black dots), in the absence of dephasing noise, and experimentally (red dots), to prepare the state A by optimal control.…”

mentioning

confidence: 99%

Optimal preparation of quantum states on an atom-chip device

Lovecchio¹,

Schäfer

Cherukattil³

et al. 2016

Phys. Rev. A

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Atom chips provide compact and robust platforms towards practical quantum technologies. A quick and faithful preparation of arbitrary input states for these systems is crucial but represents a very challenging experimental task. This is especially difficult when the dynamical evolution is noisy and unavoidable setup imperfections have to be considered. Here, we experimentally prepare with very high small errors different internal states of a Rubidium Bose-Einstein condensate realized on an atom chip. As a possible application of our scheme, we apply it to improve the sensitivity of an atomic interferometer.Microscopic magnetic traps, as atom chips [1,2], represent an important advance in the field of degenerate quantum gases towards their realization of practical quantum technological devices. Indeed, applications outside the laboratory depend on the compactness and robustness of these setups. Atom chips have already enabled, for instance, the demonstration of miniaturized interferometers [3,4], or the creation of squeezed atomic states [5]. Very recently, they have been also applied to the realization of atom interferometers based on non-classical motional states [6]. Furthermore, atom chips can be integrated with nanostructures [7], or photonic components [8], to implement new quantum information processing tools, or used as novel platforms for quantum simulations [9] and controllable coherent dynamics [10].As in most quantum technological applications, the ability to quickly and faithfully prepare arbitrary input states is of utmost importance. In particular, it is essential to speedup the initialization protocol of these quantum devices in order to reduce the effects of the inevitably present noise and decoherence sources. In this context, quantum optimal control provides powerful tools to tackle this problem by finding the optimal way to transform the system from an experimentally readily prepared initial condition to a desired state with high fidelity from which further quantum manipulations can be performed [11][12][13]. It has been successfully implemented in several physical systems, ranging from cold atoms [14] to molecules [15]. Recently optimal control algorithms have been developed and successfully applied to many-body quantum systems [16][17][18][19][20][21].In addition, optimal control allows one to speed up the state preparation process up to the ultimate bound imposed by quantum mechanics, the so-called quantum speed limit (QSL) [22][23][24][25]. Indeed, the change of a state into a different one cannot occur faster than a time scale that is inversely proportional to the associated energy scale. This is especially relevant for quantum systems like Bose-Einstein condensates (BECs) where it is crucial to perform some desired (coherent) task before dephasing processes unavoidably occur [26]. In this work we present experimental results obtained on a Rubidium ( 87 Rb) BEC, trapped on an atom chip, evolving in a five-level Hilbert space given by the five spin orientations of the F = 2 hyperfine groun...

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A multi-state interferometer on an atom chip

Cited by 40 publications

References 42 publications

Coherent transport by adiabatic passage on atom chips

Coherent transport by adiabatic passage on atom chips

Quasi one-dimensional Bose–Einstein condensate in a gravito-optical surface trap

Optimal preparation of quantum states on an atom-chip device

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