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Tian Guo 《中国物理 B》2022,31(9):93201-093201
Based upon the new designed helical resonator, the resonant radio frequency (RF) for trapping ions can be consecutively adjusted in a large range (about 12 MHz to 29 MHz) with high Q-factors (above 300). We analyze the helical resonator with a lumped element circuit model and find that the theoretical results fit well with the experimental data. With our resonator system, the resonant frequency near magic RF frequency (where the scalar Stark shift and the second-order Doppler shift due to excess micromotion cancel each other) can be continuously changed at kHz level. For 88Sr+ ion, compared to earlier results, the measurement accuracy of magic RF frequency can be improved by an order of magnitude upon rough calculation, and therefore the net micromotion frequency shifts can be further reduced. Also, the differential static scalar polarizability Δα0 of clock transition can be experimentally measured more accurately.  相似文献   
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广义KdV孤子解和广义KdV-Burgers行波解的条件稳定性   总被引:3,自引:0,他引:3       下载免费PDF全文
李朝红 《物理学报》1998,47(9):1409-1415
对于一类KdV方程的孤子解和一类KdV-Burgers方程的行波解,利用直接扰动法证明了它们具有条件稳定性,即解的稳定性敏感的依赖于方程的参数和初始条件,从而推广和修正了近期文献中关于这些解不稳定的结论. 关键词:  相似文献   
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鹿博  韩成银  庄敏  柯勇贯  黄嘉豪  李朝红 《物理学报》2019,68(4):40306-040306
量子精密测量是基于量子力学的基本原理对特定物理量实施测量,并利用量子效应提高测量精度的交叉科学.随着超冷原子实验技术的发展,超冷原子为量子精密测量提供了一个优异的研究平台.利用发展成熟的量子调控技术,人们可以基于超冷原子系综制备一些新奇的非高斯多粒子纠缠态.基于多体量子干涉,利用这些非高斯纠缠态作为输入,可以实现超越标准量子极限的高精度测量.本文简要综述这一研究领域的进展.  相似文献   
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We present a cluster mean-field study for ground-state phase diagram and many-body dynamics of spin-1 bosons confined in a two-chain Bose-Hubbard ladder(BHL).For unbiased BHL,we find superfluid(SF)phase and integer filling Mott insulator(Int MI)phase.For biased BHL,in addition to the SF and Int MI phases,there appears half-integer filling Mott insulator(HInt MI)phase.The phase transition between the SF and Int MI phases can be first order at a part of phase boundaries,while the phase transition between the SF and HInt MI phases is always second order.By tuning the bias energy,we report on the change of the nature of SF-MI phase transitions.Furthermore,we study the effect of the spin-dependent interaction on the many-body population dynamics.The spin-dependent interaction can lead to rich dynamical behaviors,but does not influence the particle transfer efficiency.Our results indicate a way to tune the nature of the SF-MI phase transition and open a new avenue to study the many-body dynamics of spinor bosons in optical lattices.  相似文献   
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谢艺  万威  周飞  陈亮  李朝红  冯芒 《中国物理 B》2012,21(6):63201-063201
Quantum computing requires ultracold ions in a ground vibrational state,which is achieved by sideband cooling.We report our recent efforts towards the Lamb-Dicke regime which is a prerequisite of sideband cooling.We first analyse the possible imperfection in our linear ion trap setup and then demonstrate how to suppress the imperfection by compensating the excess micromotion of the ions.The ions,after the micromotion compensation,are estimated to be very close to the Doppler-cooling limit.  相似文献   
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钟宏华  谢琼涛  徐军  海文华  李朝红 《中国物理 B》2014,23(2):20314-020314
We investigate the nonlinear dissipative coherence bifurcation and population dynamics of a two-component atomic Bose-Einstein condensate coupling with a continuum. The coupling between the two-component condensates and the continuum brings effective dissipations to the two-component condensates. The steady states and the coherence bifurcation depend on both dissipation and the nonlinear interaction between condensed atoms. The coherence among condensed atoms may be even enhanced by the effective dissipations. The combination of dissipation and nonlinearity allows one to control the switching between different self-trapped states or the switching between a self-trapped state and a non-self-trapped state.  相似文献   
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We propose a method to implement a Mach-Zehnder interferometry based upon a string of trapped ions with artificial nonlinear interactions. By manipulating the coupling strength between two involved internal states of the ions, we could achieve the beam splitting/recombination with NOON states. Using current techniques for manipulating trapped ions, we discuss the experimental feasibility of our scheme and analyze some undesired uncertainty under realistic experimental environment.  相似文献   
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