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 language | English |
|---|---|
| Article number | 043409 |
| Pages (from-to) | 1-8 |
| Number of pages | 8 |
| Journal | Physical Review A - Atomic, Molecular, and Optical Physics |
| Volume | 92 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 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.Fingerprint
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