Experimental study of the role of trap symmetry in an atom-chip interferometer above the Bose–Einstein condensation threshold

Dupont-Nivet, Matthieu; Demur, Romain; Westbrook, Christoph I; Schwartz, Sylvain

doi:10.1088/1367-2630/aabc72

Cited by 8 publications

(11 citation statements)

References 38 publications

(74 reference statements)

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“…[4]: in absence of interaction, t c is the characteristic contrast decay time. This decay is also consistent with the experimental data [5]. Here, since we neglected interactions, the phase shift only comes from the potential asymmetry.…”

Section: A Case Without Interactionsupporting

confidence: 91%

“…We have identified the differences between our geometry and that of Ref. [23] which account for the absence of extended coherence time in our case [5]. For the trapped atom inertial sensor, we find that ISRE does not play an important role, as expected.…”

Section: Introductionsupporting

confidence: 77%

“…Therefore one does not expect the ISRE to have the same consequences as for trapped atomic clocks. In the absence of interactions, we have shown that the coherence time for trapped atom interferometers with spatial separation, defined by the decay time of the fringe contrast, was governed by the asymmetry in the trapping potentials of the two arms [4,5]. One objective of this manuscript is to study how the presence of interactions affects those predictions.…”

Section: Introductionmentioning

confidence: 99%

“…One objective of this manuscript is to study how the presence of interactions affects those predictions. Another objective is to study the link between ISRE and the geometry of the trapping potential in the clock configuration, motivated by the fact that ISRE was not observed in our recent experiments [5] despite the similarity of our apparatus to that of Ref. [23].…”

Section: Introductionmentioning

confidence: 99%

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Effect of trap symmetry and atom-atom interactions on a trapped-atom interferometer with internal state labeling

2021

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In this paper, we study the dynamics of a trapped atom interferometer with internal state labeling in the presence of interactions. We consider two situations: an atomic clock in which the internal states remain superposed, and an inertial sensor configuration in which they are separated. From the average spin evolution, we deduce the fringe contrast and the phase shift. In the clock configuration, we recover the well-known identical spin rotation effect (ISRE) which can significantly increase the spin coherence time. We also find that the magnitude of the effect depends on the trap geometry in a way that is consistent with our recent experimental results in a clock configuration [M. Dupont-Nivet, R. Demur, C. I. Westbrook, and S. Schwartz, New J. Phys. 20, 043051 (2018)], where ISRE was not observed. In the case of an inertial sensor, we show that despite the spatial separation it is still possible to increase the coherence time by using mean field interactions to counteract asymmetries of the trapping potential.

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Section: A Case Without Interactionsupporting

confidence: 91%

Section: Introductionsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of trap symmetry and atom-atom interactions on a trapped-atom interferometer with internal state labeling

2021

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“…Any asymmetry in the trap frequency of the harmonic traps for the two spin states lead to decoherence, since the spin states then have slightly different trap state energies and thus dephase over time. This decoherence mechanism has been studied both theoretically [4,23] and experimentally [24]: the coherence time is given by t c =hω trap /(|δω trap |k B T), where ω trap is the trap frequency, δω trap is the trap frequency asymmetry, and T is the temperature of the atoms (k B is Boltzmann's constant). While the symmetry of the traps can be enforced by the careful adjustments of trap parameters over the course in the interferometry process, uncontrolled deviations in the parameters ultimately lead to asymmetry fluctuations in the two traps.…”

Section: Asymmetry Decoherencementioning

confidence: 99%

Microwave Atom Chip Design

Miyahira

Rotunno

et al. 2021

Atoms

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We present a toolbox of microstrip building blocks for microwave atom chips geared towards trapped atom interferometry. Transverse trapping potentials based on the AC Zeeman (ACZ) effect can be formed from the combined microwave magnetic near fields of a pair or a triplet of parallel microstrip transmission lines. Axial confinement can be provided by a microwave lattice (standing wave) along the microstrip traces. Microwave fields provide additional parameters for dynamically adjusting ACZ potentials: detuning of the applied frequency to select atomic transitions and local polarization controlled by the relative phase in multiple microwave currents. Multiple ACZ traps and potentials, operating at different frequencies, can be targeted to different spin states simultaneously, thus enabling spin-specific manipulation of atoms and spin-dependent trapped atom interferometry.

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Interference properties of a trapped atom interferometer in two asymmetric optical dipole traps*

Wang¹,

Li²,

Wang³

et al. 2020

Chinese Phys. B

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We investigate interference properties of a trapped atom interferometer where two symmetric optical dipole traps (ODTs) act as the atomic wave-packets splitter and combiner with internal state labelling. After the preparation of initial superposition states, the atomic wave-packet is adiabatically split and moves into two spatially separate asymmetric ODTs. The atomic wave-packets in two ODTs are then adiabatically recombined after a duration of free evolving in traps, completing the interference cycle of this atom interferometer. We show that the interferogram exhibits a series of periodic revivals in interference visibility. Furthermore, the revival period decreases as the asymmetry of two dipole potentials increases. By introducing an echo sequence to the interferometer, we show that while the echo effect is not influenced by the asymmetry of the two ODTs, the onset of periodic revivals changes by the echo sequence. Our study provides an effective method to cancel or compensate the phase shift caused by position and time correlated force.

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Experimental study of the role of trap symmetry in an atom-chip interferometer above the Bose–Einstein condensation threshold

Cited by 8 publications

References 38 publications

Effect of trap symmetry and atom-atom interactions on a trapped-atom interferometer with internal state labeling

Effect of trap symmetry and atom-atom interactions on a trapped-atom interferometer with internal state labeling

Microwave Atom Chip Design

Interference properties of a trapped atom interferometer in two asymmetric optical dipole traps*

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