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Proceedings Paper

Microwave electric field sensing with Rydberg atoms
Author(s): Daniel T. Stack; Paul D. Kunz; David H. Meyer; Neal Solmeyer
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Paper Abstract

Atoms form the basis of precise measurement for many quantities (time, acceleration, rotation, magnetic field, etc.). Measurements of microwave frequency electric fields by traditional methods (i.e. engineered antennas) have limited sensitivity and can be difficult to calibrate properly. Highly-excited (Rydberg) neutral atoms have very large electric-dipole moments and many dipole allowed transitions in the range of 1 - 500 GHz. It is possible to sensitively probe the electric field in this range using the combination of two quantum interference phenomena: electromagnetically induced transparency and the Autler-Townes effect. This technique allows for very sensitive field amplitude, polarization, and sub-wavelength imaging measurements. These quantities can be extracted by measuring properties of a probe laser beam as it passes through a warm rubidium vapor cell. Thus far, Rydberg microwave electrometry has relied upon the absorption of the probe laser. We report on our use of polarization rotation, which corresponds to the real part of the susceptibility, for measuring the properties of microwave frequency electric fields. Our simulations show that when a magnetic field is present and directed along the optical propagation direction a polarization rotation signal exists and can be used for microwave electrometry. One central advantage in using the polarization rotation signal rather than the absorption signal is that common mode laser noise is naturally eliminated leading to a potentially dramatic increase in signal-to-noise ratio.

Paper Details

Date Published: 19 May 2016
PDF: 8 pages
Proc. SPIE 9873, Quantum Information and Computation IX, 987306 (19 May 2016); doi: 10.1117/12.2223059
Show Author Affiliations
Daniel T. Stack, The MITRE Corp. (United States)
Paul D. Kunz, U.S. Army Research Lab. (United States)
David H. Meyer, Univ. of Maryland, College Park (United States)
Neal Solmeyer, U.S. Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 9873:
Quantum Information and Computation IX
Eric Donkor; Michael Hayduk, Editor(s)

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