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Quantum Control of Two Critically Dressed Spin 1/2 Species in Magnetic Fluctuations

Tat, Raymond and Swank, C. M. (2021) Quantum Control of Two Critically Dressed Spin 1/2 Species in Magnetic Fluctuations. . (Unpublished)

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The neutron electric dipole moment experiment at the Spallation Neutron Source (nEDM@SNS experiment) proposes to measure the nEDM using the spin-dependent capture cross section of neutrons on ³He. The critical dressing mode of this experiment uses an oscillating magnetic field to dress the gyromagnetic ratios of neutrons and ³He to the same value. While this technique grants increased sensitivity to the nEDM by improving the signal-to-noise ratio, this mode of measurement also introduces additional noise from the power supply used to drive the dressing field. This can lead to randomly fluctuating magnetic fields which cause the spins of neutrons and ³He to drift apart over time. Here we use second-order time-dependent perturbation theory to compute relaxation and frequency shifts due to fluctuations in the dressing field in terms of the magnetic field noise power spectrum and compare these calculations to numerical solutions obtained by integrating the Bloch equations. We then use these results to develop mitigation strategies for this type of noise. Furthermore, we report on spin dressing modulation techniques that significantly amplify coherence times for the critically dressed system, and attempt to quantify the coherence time achievable.

Item Type:Report or Paper (Discussion Paper)
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URLURL TypeDescription Paper
Subject Keywords:fundamental symmetries; CP violation; neutrons; quantum control; NMR; spin dressing
Record Number:CaltechAUTHORS:20220113-234544323
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:112899
Deposited By: George Porter
Deposited On:14 Jan 2022 16:17
Last Modified:10 May 2022 23:09

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