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.
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页数：8
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