Observation of quantum stochastic synchronization in a dissipative quantum system

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	Observation of quantum stochastic synchronization in a dissipative quantum system
	Xue, GM ; Gong, M ; Xu, HK ; Liu, WY ; Deng, H ; Tian, Y ; Yu, HF ; Yu, Y ; Zheng, DN ; Zhao, SP ; Han, SY
刊名	PHYSICAL REVIEW B
	2014
卷号	90 期号:22
ISSN号	1098-0121
通讯作者	Xue, GM (reprint author), Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China.
中文摘要	We report the observation of quantum stochastic synchronization (QSS) in a dissipative quantum system-a moderately damped current-biased Josephson junction. We show that when the junction is biased subcritically by a combination of a constant current and a small sinusoidal modulation signal, forced phase synchronization between the otherwise random, incoherent quantum tunneling and the signal may arise as a consequence of the interplay between quantum fluctuation and the weak periodic drive. It is found that optimal synchronization occurs at a signal frequency f(QSS) that is comparable to the quantum tunneling rate. We also find a phenomenon called "modulation induced suppression of quantum noise": for signal frequency well below fQSS, the power spectral density of escape time distribution of the junction could be reduced substantially from the floor level of the unmodulated system. Furthermore, we demonstrate that the application of a small signal with proper phase can suppress the average tunneling rate and enhance the stability of the metastable system. Our experimental results agree well with the numerical calculations without the use of adjustable parameters.
资助信息	Ministry of Science and Technology of China [2011CBA00106, 2014CB921202, 2011CB922104, 2011CBA00200]; National Natural Science Foundation of China [91321208, 11161130519, 91021003, 11104340]; US NSF [PHY-1314861]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59494]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Xue, GM,Gong, M,Xu, HK,et al. Observation of quantum stochastic synchronization in a dissipative quantum system[J]. PHYSICAL REVIEW B,2014,90(22).
APA	Xue, GM.,Gong, M.,Xu, HK.,Liu, WY.,Deng, H.,...&Han, SY.(2014).Observation of quantum stochastic synchronization in a dissipative quantum system.PHYSICAL REVIEW B,90(22).
MLA	Xue, GM,et al."Observation of quantum stochastic synchronization in a dissipative quantum system".PHYSICAL REVIEW B 90.22(2014).