Suppression and enhancement of decoherence in an atomic Josephson junction

CORC > 上海光学精密机械研究所 > 中国科学院上海光学精密机械研究所 > 量子光学重点实验室

	Suppression and enhancement of decoherence in an atomic Josephson junction
	Vardi, Amichay; Keil, Mark; Folman, Ron; Henkel, Carsten; Zhou, Shuyu; Japha, Yonathan
刊名	New J. Phys.
	2016
卷号	18
通讯作者	mhkeil@gmail.com ; folman@bgu.ac.il
英文摘要	We investigate the role of interatomic interactions when a Bose gas, in a double-well potential with a finite tunneling probability (a 'Bose-Josephson junction'), is exposed to external noise. We examine the rate of decoherence of a system initially in its ground state with equal probability amplitudes in both sites. The noise may induce two kinds of effects: firstly, random shifts in the relative phase or number difference between the two wells and secondly, loss of atoms from the trap. The effects of induced phase fluctuations are mitigated by atom-atom interactions and tunneling, such that the dephasing rate may be suppressed by half its single-atom value. Random fluctuations may also be induced in the population difference between the wells, in which case atom-atom interactions considerably enhance the decoherence rate. A similar scenario is predicted for the case of atom loss, even if the loss rates from the two sites are equal. We find that if the initial state is number-squeezed due to interactions, then the loss process induces population fluctuations that reduce the coherence across the junction. We examine the parameters relevant for these effects in a typical atom chip device, using a simple model of the trapping potential, experimental data, and the theory of magnetic field fluctuations near metallic conductors. These results provide a framework for mapping the dynamical range of barriers engineered for specific applications and set the stage for more complex atom circuits ('atomtronics').
收录类别	SCI
资助信息	Israeli Science Foundation [1381/13]; European Commission 'MatterWave' consortium [FP7-ICT-601180]; German DFG through the DIP program [FO 703/2-1, SCHM 1049/7-1]; PBC program for outstanding postdoctoral researchers of the Israeli Council for Higher Educ
WOS记录号	WOS:000377193400002
内容类型	期刊论文
源URL	[http://ir.siom.ac.cn/handle/181231/27829]
专题	上海光学精密机械研究所_量子光学重点实验室
作者单位	中国科学院上海光学精密机械研究所
推荐引用方式 GB/T 7714	Vardi, Amichay,Keil, Mark,Folman, Ron,et al. Suppression and enhancement of decoherence in an atomic Josephson junction[J]. New J. Phys.,2016,18.
APA	Vardi, Amichay,Keil, Mark,Folman, Ron,Henkel, Carsten,Zhou, Shuyu,&Japha, Yonathan.(2016).Suppression and enhancement of decoherence in an atomic Josephson junction.New J. Phys.,18.
MLA	Vardi, Amichay,et al."Suppression and enhancement of decoherence in an atomic Josephson junction".New J. Phys. 18(2016).