Time-orbiting potential trap for Bose-Einstein condensate interferometry

Reeves, J. M.; Garcia, Oscar Viyuela; Deissler, B.; Baranowski, K. L.; Hughes, K. J.; Sackett, C. A.

doi:10.1103/physreva.72.051605

Cited by 18 publications

(25 citation statements)

References 21 publications

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“…For thermal atoms, the velocity spread will be determined by the gas temperature, while for condensate atoms, it is limited by the uncertainty principle and technical effects. In our experiments [23], we produce Rb condensates in a relatively tight trap and then adiabatically reduce the confinement to give an oscillation frequency in the range of 1 to 10 Hz. After this process, we typically observe a center-of-mass motional excitation corresponding to a velocity variance σ 2 v of about ω 0 × 10 −8 m 2 /s.…”

Section: A Estimation Of Effectmentioning

confidence: 99%

Effect of trap anharmonicity on a free-oscillation atom interferometer

Leonard

Sackett

2012

Phys. Rev. A

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A free-oscillation interferometer uses atoms confined in a harmonic trap. Bragg scattering from an off-resonant laser is used to split an atomic wave function into two separated packets. After one or more oscillations in the trap, the wave packets are recombined by a second application of the Bragg laser to close the interferometer. Anharmonicity in the trap potential can lead to a phase shift in the interferometer output. In this paper, analytical expressions for the anharmonic phase are derived at leading order for perturbations of arbitrary power in the position coordinate. The phase generally depends on the initial position and velocity of the atom, which are themselves typically uncertain. This leads to degradation in the interferometer performance, and can be expected to limit the use of a cm-scale device to interaction times of about 0.1 s. Methods to improve performance are discussed.Comment: 8 pages, 5 figure

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Section: A Estimation Of Effectmentioning

confidence: 99%

Effect of trap anharmonicity on a free-oscillation atom interferometer

Leonard

Sackett

2012

Phys. Rev. A

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“…Forced radio-frequency (rf) evaporative cooling is initially performed in the stiff linear potential of the fullycompressed quadrupole trap (350 G/cm axial gradient), where it is more efficient until Majorana losses outweigh the advantage of a linear potential [21]. After a 14 s-long linear rf evaporation ramp down to a temperature of 75 µK and an atom number of 7 × 10 7 , the phase-space density has increased to 1 × 10 −4 and the lifetime in the § An alternative, fast feedback scheme has been described in [19], where the focus is on reducing current noise to improve the coherence time for condensate interferometry in a special TOP waveguide [18].…”

Section: Condensate Production In the Mctop Trapmentioning

confidence: 99%

Versatile transporter apparatus for experiments with optically trapped Bose–Einstein condensates

Pertot

Greif²,

Albert

et al. 2009

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

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Abstract. We describe a versatile and simple scheme for producing magnetically and optically-trapped 87 Rb Bose-Einstein condensates, based on a moving-coil transporter apparatus. The apparatus features a TOP trap that incorporates the movable quadrupole coils used for magneto-optical trapping and long-distance magnetic transport of atomic clouds. As a stand-alone device, this trap allows for the stable production of condensates containing up to one million atoms. In combination with an optical dipole trap, the TOP trap acts as a funnel for efficient loading, after which the quadrupole coils can be retracted, thereby maximizing optical access. The robustness of this scheme is illustrated by realizing the superfluid-to-Mott insulator transition in a three-dimensional optical lattice.

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“…Our interferometer has been described in detail in Ref. [6,12], and the basic operation is illustrated in Fig. 1(a).…”

Section: Introductionmentioning

confidence: 99%

Confinement effects in a guided-wave atom interferometer with millimeter-scale arm separation

et al. 2008

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Abstract. Guided-wave atom interferometers measure interference effects using atoms held in a confining potential. In one common implementation, the confinement is primarily two-dimensional, and the atoms move along the nearly free dimension under the influence of an off-resonant standing wave laser beam. In this configuration, residual confinement along the nominally free axis can introduce a phase gradient to the atoms that limits the arm separation of the interferometer. We experimentally investigate this effect in detail, and show that it can be alleviated by having the atoms undergo a more symmetric motion in the guide. This can be achieved by either using additional laser pulses or by allowing the atoms to freely oscillate in the potential. Using these techniques, we demonstrate interferometer measurement times up to 72 ms and arm separations up to 0.42 mm with a well controlled phase, or times of 0.91 s and separations of 1.7 mm with an uncontrolled phase.

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Time-orbiting potential trap for Bose-Einstein condensate interferometry

Cited by 18 publications

References 21 publications

Effect of trap anharmonicity on a free-oscillation atom interferometer

Effect of trap anharmonicity on a free-oscillation atom interferometer

Versatile transporter apparatus for experiments with optically trapped Bose–Einstein condensates

Confinement effects in a guided-wave atom interferometer with millimeter-scale arm separation

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