Raman resonances in arbitrary magnetic fields

The quantum mechanical propagator of a massive particle in a linear gravitational potential derived already in 1927 by Earle H. Kennard [2, 3] contains a phase that scales with the third power of the time T during which the particle experiences the corresponding force. Since in conventional atom interferometers the internal atomic states are all exposed to the same acceleration a, this T 3 -phase cancels out and the interferometer phase scales as T 2 . In contrast, by applying an external magnetic field we prepare two different accelerations a 1 and a 2 for two internal states of the atom, which translate themselves into two different cubic phases and the resulting interferometer phase scales as T 3 . We present the theoretical background for, and summarize our progress towards experimentally realizing such a novel atom interferometer.

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“…for the T 3 -experiment, transitions with ∆m F = ±1 are suppressed in our experimental setup [42,43].…”

Section: Raman Spectrummentioning

confidence: 99%

T 3-Interferometer for atoms

et al. 2017

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“…Additional details can be found in [25,26]. The measurements are performed on cold 85 Rb atoms captured in a vapor-loaded magneto-optical trap (MOT).…”

Section: Methodsmentioning

confidence: 99%

“…As we have previously demonstrated [26], the spacing between the Raman peaks can be controlled by the magnitude of the magnetic field and the relative heights of the peaks can be adjusted by changing the orientation of the magnetic field. We measured the Raman spectrum using the timing and measurement scheme described in [25,26] and adjusted the magnitude and orientation of the magnetic field to ensure that the clock transition and the ±1 magnetic transitions were well resolved.…”

Section: Methodsmentioning

confidence: 99%

A frequency selective atom interferometer magnetometer

Braje

DeSavage²,

Adler

et al. 2014

Journal of Modern Optics

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In this article, we discuss the magnetic-field frequency selectivity of a time-domain interferometer based on the number and timing of intermediate π pulses. We theoretically show that by adjusting the number of π pulses and the π -pulse timing, we can control the frequency selectivity of the interferometer to time varying and DC magnetic fields. We present experimental data demonstrating increased coherence time due to bandwidth filtering with the inclusion of a π pulse between the initial and final π/2 pulses, which mitigates sensitivity to low frequency magnetic fields.

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