Control of conditional quantum beats in cavity QED: amplitude decoherence and phase shifts

被引：9
|
作者：
Cimmarusti, A. D. [1 ,2 ]
Schroeder, C. A. [1 ,2 ]
Patterson, B. D. [1 ,2 ]
Orozco, L. A. [1 ,2 ]
Barberis-Blostein, P. [3 ]
Carmichael, H. J. [4 ]
机构：
[1] Univ Maryland, Dept Phys, Joint Quantum Inst, College Pk, MD 20742 USA
[2] NIST, College Pk, MD 20742 USA
[3] Univ Nacl Autonoma Mexico, Inst Invest Matemat Aplicadas & Sistemas, Mexico City 04510, DF, Mexico
[4] Univ Auckland, Dept Phys, Auckland, New Zealand
来源：
NEW JOURNAL OF PHYSICS | 2013年 / 15卷
基金：
美国国家科学基金会;
关键词：
ERASER;
D O I：
10.1088/1367-2630/15/1/013017
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We implement a simple feedback mechanism on a two-mode cavity QED system to preserve the Zeeman coherence of a ground state superposition that generates quantum beats on the second-order correlation function. Our investigation includes theoretical and experimental studies that show how to prevent a shift away from the Larmor frequency and associated decoherence caused by Rayleigh scattering. The protocol consists of turning off the drive of the system after the detection of a first photon and letting it evolve in the dark. Turning the drive back on after a pre-set time reveals a phase accumulated only from Larmor precession, with the amplitude of the quantum beat more than a factor of two larger than with continuous drive.
引用
收藏
页数：15
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