Influence of spontaneous emission on a single-state atom interferometer

Beattie, Scott; Barrett, B.; Weel, M.; Chan, I.; Mok, C.; Cahn, S. B.; Kumarakrishnan, A.

doi:10.1103/physreva.77.013610

Cited by 17 publications

(34 citation statements)

References 23 publications

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“…Specifically, the only momentum states contributing to the signal are those that differ byhq after SW3 and after SW2. 4 The non-uniform magnetic field produced by a stainless-steel vacuum chamber, and the gravity-induced Doppler shift limited previous experiments to T 10 ms [76,100,101]. diameter of d ∼ 1.7 cm and are circularly polarized in the same sense by a pair of λ/4 wave plates.…”

Section: Methodsmentioning

confidence: 99%

“…The grating-echo AI is a single-state Talbot-Lau interferometer [72][73][74], the principles of which can be understood on the basis of a plane-wave description of the two-pulse scheme shown in Fig. 1(b) [32,54,55,[75][76][77]. This AI relies on matter-wave interference produced by Kapitza-Dirac scattering of atoms by short, off-resonant standing wave (SW) pulses.…”

Section: Description Of Grating-echo-type Interferometersmentioning

confidence: 99%

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Prospects for Precise Measurements with Echo Atom Interferometry

Barrett

Carew

Beica

et al. 2016

Atoms

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Echo atom interferometers have emerged as interesting alternatives to Raman interferometers for the realization of precise measurements of the gravitational acceleration g and the determination of the atomic fine structure through measurements of the atomic recoil frequency ω q . Here we review the development of different configurations of echo interferometers that are best suited to achieve these goals. We describe experiments that utilize near-resonant excitation of laser-cooled rubidium atoms by a sequence of standing wave pulses to measure ω q with a statistical uncertainty of 37 parts per billion (ppb) on a time scale of ∼50 ms and g with a statistical precision of 75 ppb. Related coherent transient techniques that have achieved the most statistically precise measurements of atomic g-factor ratios are also outlined. We discuss the reduction of prominent systematic effects in these experiments using off-resonant excitation by low-cost, high-power lasers.

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Section: Methodsmentioning

confidence: 99%

Section: Description Of Grating-echo-type Interferometersmentioning

confidence: 99%

Prospects for Precise Measurements with Echo Atom Interferometry

Barrett

Carew

Beica

et al. 2016

Atoms

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“…spontaneous emission are reduced [36]. The sw pulse durations τ 1 , τ 2 , τ 3 , are sufficiently short such that the motion of the atoms during the excitation can be ignored (Raman-Nath regime).…”

Section: Theorymentioning

confidence: 99%

Demonstration of improved sensitivity of echo interferometers to gravitational acceleration

Mok¹,

Barrett²,

Carew³

et al. 2013

Phys. Rev. A

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We have developed two configurations of an echo interferometer that rely on standing wave excitation of a laser-cooled sample of rubidium atoms. Both configurations can be used to measure acceleration a along the axis of excitation. For a two-pulse configuration, the signal from the interferometer is modulated at the recoil frequency and exhibits a sinusoidal frequency chirp as a function of pulse spacing. In comparison, for a three-pulse stimulated echo configuration, the signal is observed without recoil modulation and exhibits a modulation at a single frequency as a function of pulse spacing. The three-pulse configuration is less sensitive to effects of vibrations and magnetic field curvature leading to a longer experimental timescale. For both configurations of the atom interferometer (AI), we show that a measurement of acceleration with a statistical precision of 0.5% can be realized by analyzing the shape of the echo envelope that has a temporal duration of a few microseconds. Using the two-pulse AI, we obtain measurements of acceleration that are statistically precise to 6 parts per million (ppm) on a 25 ms timescale. In comparison, using the three-pulse AI, we obtain measurements of acceleration that are statistically precise to 0.4 ppm on a timescale of 50 ms. A further statistical enhancement is achieved by analyzing the data across the echo envelope so that the statistical error is reduced to 75 parts per billion (ppb). The inhomogeneous field of a magnetized vacuum chamber limited the experimental timescale and resulted in prominent systematic effects. Extended timescales and improved signal-to-noise ratio observed in recent echo experiments using a non-magnetic vacuum chamber suggest that echo techniques are suitable for a high precision measurement of gravitational acceleration g. We discuss methods for reducing systematic effects and improving the signal-to-noise ratio. Simulations of both AI configurations with a timescale of 300 ms suggest that an optimized experiment with improved vibration isolation and atoms selected in the mF = 0 state can result in measurements of g statistically precise to 0.3 pbb for the two-pulse AI and 0.6 ppb for the three-pulse AI.

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“…In high-order Bragg diffraction, the fidelity of populating the target states is very sensitive to the width of the momentum spread along the beam axis [18]. Additionally the significant atom laser interaction time for all of these schemes introduces finite amount of spontaneous emission which causes dephasing [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…This resonance phenomenon is based on the matter wave analog of the * Electronic mail: umakant.rapol@iiserpune.ac.in optical Talbot effect [25] and the drive period at which it occurs is called the Talbot time [21,26]. The typical light-atom interaction time for the pulses used here (∼0.5 µs -1 µs) is orders of magnitude less in comparison to the Bragg pulses (∼100 µs) [13] and hence can lead to decrease in the laser induced noise and decoherence effects [19]. The first demonstration of temporal the Talbot effect in matter waves using a Bose-Einstein Condensate (BEC) was given by L. Deng et al (1999) [21].…”

Section: Introductionmentioning

confidence: 99%

Atom interferometry using temporal Talbot effect on a Bose-Einstein condensate

Mangaonkar,

Vishwakarma,

Maurya

et al. 2019

Preprint

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Obtaining a large momentum difference between matter wave-packets traversing the two paths in an atom interferometer while preserving the phase coherence is a challenge. We experimentally investigate a pulse sequence in which this momentum difference is obtained by using the matter-wave Talbot effect as an alternative to the conventional light-pulse atom interferometers. An ensemble of coherent atoms (Bose-Einstein condensate) is exposed to a periodic sequence of 2N standing wave pulses of far-detuned light. The first set of N pulses in the sequence produces multiple wavepackets with momentum difference up to 28 k (at N = 5), by virtue of Talbot resonance. The second set of N pulses reverses the momentum transfer and allows the wavepackets to retrace the path and interfere to retrieve the initial wavepacket. We observe that the degree of reversal and thus the practical performance of the interferometer is sensitive to the initial momentum width of the atomic ensemble.

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Influence of spontaneous emission on a single-state atom interferometer

Cited by 17 publications

References 23 publications

Prospects for Precise Measurements with Echo Atom Interferometry

Prospects for Precise Measurements with Echo Atom Interferometry

Demonstration of improved sensitivity of echo interferometers to gravitational acceleration

Atom interferometry using temporal Talbot effect on a Bose-Einstein condensate

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