Bi-selective pulses for large-area atom interferometry

• URL: http://arxiv.org/abs/2004.12147v1
• Date: Sat, 25 Apr 2020 13:49:58 GMT
• Title: Bi-selective pulses for large-area atom interferometry
• Authors: Jack Saywell, Max Carey, Ilya Kuprov and Tim Freegarde
• Abstract summary: We present designs for augmentation'mirror' pulses of large-momentum-transfer atom interferometers. The augmentation pulses maintain their fidelity as the wavepacket momentum difference is increased. We show how these pulses may be adapted to suppress the detrimental off-resonant excitation that limits other broadband pulse schemes.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We present designs for the augmentation 'mirror' pulses of large-momentum-transfer atom interferometers that maintain their fidelity as the wavepacket momentum difference is increased. These bi-selective pulses, tailored using optimal control methods to the evolving bi-modal momentum distribution, should allow greater interferometer areas and hence increased inertial measurement sensitivity, without requiring elevated Rabi frequencies or extended frequency chirps. Using an experimentally validated model, we have simulated the application of our pulse designs to large-momentum-transfer atom interferometry using stimulated Raman transitions in a laser-cooled atomic sample of $^{85}$Rb at 1 $\mu$K. After the wavepackets have separated by 42 photon recoil momenta, our pulses maintain a fringe contrast of 90% whereas, for adiabatic rapid passage and conventional $\pi$ pulses, the contrast is less than 10%. Furthermore, we show how these pulses may be adapted to suppress the detrimental off-resonant excitation that limits other broadband pulse schemes.

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