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Poster Session

Poster Session III

4:00 pm – 6:00 pm, Thursday June 19 Session S00 Oregon Convention Center:, Exhibit Hall E
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Quantum non-demolition measurements in light-atom ensembles

Poster 71
Presenter: Eduardo Ibarra Garcia Padilla (Sandia National Laboratories)
Authors: Jonathan Bainbridge (Sandia National Laboratories), Brandon Ruzic (Sandia National Laboratories), Peter Schwindt (Sandia National Laboratories)

The interaction of light with an atomic vapor can be configured to be one of the most sensitive magnetic field measurement techniques. Recently, the measurement precision of such atomic magnetometers has been improved by generating spin squeezing via quantum non-demolition measurements based on paramagnetic Faraday rotation. Initially, a continuous measurement of the precessing collective spin introduces a back-action noise (BAN) which limits the knowledge acquired by the measurement. Previous results have addressed how to mitigate the BAN for an ensemble of atoms in the presence of a constant magnetic field by pulsing the probe beam at half the Larmor period [1], or by performing a continuous measurement while pulsing the magnetic field [2]. In this work, we focus on deriving analytical expressions and present numerical results of the quantum noise of a pulsed parametric Faraday rotation measurement when the magnetic field is allowed to vary in time in a non-periodic fashion.

[1] G. Vasilakis and H. Shen, et. al., Nature Physics 11, 389–392 (2015).

[2] G-Y. Zhang and K-F Zhao, Phys. Rev. A 93, 033841 (2016).

Funding acknowledgement

This material was funded by the NA-221, NNSA and the DOE and performed at Sandia National Laboratories (SNL). SNL is managed and operated by NTESS LLC, a subsidiary of Honeywell International, Inc., for the U.S. DOE's NNSA under contract DE-NA0003525. The views expressed here do not necessarily represent the views of the DOE or the U.S. Government.

POSTERS (141)