Collisional decoherence in trapped-atom interferometers that use nondegenerate sources

Stickney, James; Squires, Matthew B.; Scoville, James; Baker, Paul; Miller, Steven M.

doi:10.1103/physreva.79.013618

Cited by 6 publications

(6 citation statements)

References 24 publications

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“…These guide design parameters allow the propagation of cold thermal atoms. By using this type of source we can avoid the important contribution of atom-atom interactions to the systematic noise and drift in the inertial phase of interest, 84,[124][125][126][127] and less preparation time is required than with Bose-Einstein-condensed samples. In fact, concerning just the cooling process, cold thermal atoms used in atom interferometry are obtained after molasses cooling whereas degenerate samples require an additional evaporative-cooling step.…”

Section: Guidingmentioning

confidence: 99%

Compact chip-scale guided cold atom gyrometers for inertial navigation: Enabling technologies and design study

Alzar

2019

AVS Quantum Science

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This work reviews the topic of rotation sensing with compact cold atom interferometers. A representative set of compact free-falling cold atom gyroscopes is considered because, in different respects, they establish a rotation-measurement reference for cold guided-atom technologies. The review first discusses enabling technologies relevant to a set of key functional building blocks of an atom chip-based compact inertial sensor with cold guided atoms. These functionalities concern the accurate and reproducible positioning of atoms to initiate a measurement cycle, the coherent momentum transfer to the atom wave packets, the suppression of propagation-induced decoherence due to potential roughness, the on-chip detection, and the vacuum dynamics because of its impact on the sensor stability, which is due to measurement dead time. Based on the existing enabling technologies, the design of an atom chip gyroscope with guided atoms is formalized using a design case that treats design elements such as guiding, fabrication, scale factor, rotation-rate sensitivity, spectral response, important noise sources, and sensor stability. arXiv:1912.06851v1 [quant-ph]

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Section: Guidingmentioning

confidence: 99%

Compact chip-scale guided cold atom gyrometers for inertial navigation: Enabling technologies and design study

Alzar

2019

AVS Quantum Science

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“…By taking the limit where Ξ 1, only the lowest order contributions to Equation (20) need to be retained. If we keep n = ±1 and m = 0, ±2 and use the limiting values of J n for the small argument,…”

Section: Discussionmentioning

confidence: 99%

“…Collisions are neglected as we have previously analyzed the effects of collisions in a similar interferometer and do not expect atom-atom collisions to have a significant impact on the results [20]. We also ignore the mean field interaction, as it is mainly relevant for strongly interacting condensates, which we do not consider here.…”

Section: The Modelmentioning

confidence: 99%

A Wigner Function Approach to Coherence in a Talbot-Lau Interferometer

Imhof

Stickney

Squires

2016

Atoms

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Abstract:Using a thermal gas, we model the signal of a trapped interferometer. This interferometer uses two short laser pulses, separated by time T, which act as a phase grating for the matter waves. Near time 2T, there is an echo in the cloud's density due to the Talbot-Lau effect. Our model uses the Wigner function approach and includes a weak residual harmonic trap. The analysis shows that the residual potential limits the interferometer's visibility, shifts the echo time of the interferometer, and alters its time dependence. Loss of visibility can be mitigated by optimizing the initial trap frequency just before the interferometer cycle begins.

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“…We are currently developing a trapped atom interferometer gyroscope [28] that uses a cigar shaped harmonic trap. Our plan is to realize this trap using a two layer DBC atom chip.…”

Section: Assemblymentioning

confidence: 99%

Atom chips on direct bonded copper substrates

Squires¹,

Stickney²,

Carlson³

et al. 2011

Review of Scientific Instruments

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We present the use of direct bonded copper (DBC) for the straightforward fabrication of high power atom chips. Atom chips using DBC have several benefits: excellent copper/substrate adhesion, high purity, thick (>100 μm) copper layers, high substrate thermal conductivity, high aspect ratio wires, the potential for rapid (<8 h) fabrication, and three-dimensional atom chip structures. Two mask options for DBC atom chip fabrication are presented, as well as two methods for etching wire patterns into the copper layer. A test chip, able to support 100 A of current for 2 s without failing, is used to determine the thermal impedance of the DBC. An assembly using two DBC atom chips is used to magnetically trap laser cooled (87)Rb atoms. The wire aspect ratio that optimizes the magnetic field gradient as a function of power dissipation is determined to be 0.84:1 (height:width).

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Collisional decoherence in trapped-atom interferometers that use nondegenerate sources

Cited by 6 publications

References 24 publications

Compact chip-scale guided cold atom gyrometers for inertial navigation: Enabling technologies and design study

Compact chip-scale guided cold atom gyrometers for inertial navigation: Enabling technologies and design study

A Wigner Function Approach to Coherence in a Talbot-Lau Interferometer

Atom chips on direct bonded copper substrates

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