Detection of a weak magnetic field via cavity-enhanced Faraday rotation

Keyu Xia, Nan Zhao, Jason Twamley

Research output: Contribution to journalArticle

9 Citations (Scopus)
38 Downloads (Pure)

Abstract

We study the sensitive detection of a weak static magnetic field via Faraday rotation induced by an ensemble of spins in a bimodal degenerate microwave cavity. We determine the limit of the resolution for the sensitivity of the magnetometry achieved using either single-photon or multiphoton inputs. For the case of a microwave cavity containing an ensemble of nitrogen-vacancy defects in diamond, we obtain a magnetometry sensitivity exceeding 5.2nT/Hz utilizing a single-photon probe field, while for a multiphoton input we achieve a subfemtotesla sensitivity using a coherent-probe microwave field with power of Pin=1nW.

Original languageEnglish
Article number043409
Pages (from-to)1-8
Number of pages8
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume92
Issue number4
DOIs
Publication statusPublished - 12 Oct 2015

Bibliographical note

Xia, K., Zhao, N & Twamley, J. (2015). Detection of a weak magnetic field via cavity-enhanced Faraday rotation. Physical Review A, 92(4), 043409. Copyright (2015) by the American Physical Society. The original article can be found at http://dx.doi.org/10.1103/PhysRevA.92.043409.

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