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

被引：16

作者：

Xia, Keyu ^{[1
]}

Zhao, Nan ^{[2
]}

Twamley, Jason ^{[1
]}

机构：

[1] Macquarie Univ, Dept Phys & Astron, ARC Ctr Engn Quantum Syst, N Ryde, NSW 2109, Australia

[2] Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China

来源：

PHYSICAL REVIEW A | 2015年 / 92卷 / 04期

基金：

澳大利亚研究理事会;

关键词：

QUANTUM; SPIN; MAGNETOMETRY; INPUT; LIGHT;

D O I：

10.1103/PhysRevA.92.043409

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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 5.2 nT/root 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 P-in = 1 nW.

引用

页数：8

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