原始的Landau-Zener transition[3][4][5][6]由如下Hamiltonian描述: H=vtσz+Δσx 转换到以第二项为基础的相互作用绘景,其演化算符为 UI(t,t′)=Texp(−i∫t′tdτHΔI(τ)),HΔI(t)=exp(i∫t0tvτσzdτ)Δσxexp(−i∫t0tvτσzdτ) 我们关心的散射振幅为 A=⟨↑|...
在本文中我们要用Landau-Zener transition的理论解释为什么我们过去赢了,未来我们怎样继续赢这一重大历史命题。我们发现引入周期驱动可以使赢的概率上升到1,也就是100%赢的状态。这一现象还有待于进一步探索。 赢的Landau-Zener Transition 考虑一个两能级系统,Hamiltonian是 H=vtσz+Δσx ,这里第一项是某种驱动力...
A comprehensive theory of the Landau-Zener transition in quadratic nonlinear two-state systems is developed. A compact analytic formula involving elementary functions only is derived for the final transition probability. The formula provides a highly accurate approximation for the whole rage of the ...
非绝热跃迁 (Nonadiabatic Transition) 是体系发生物质、能量和相转换所遵循的基本途径,是...û收藏 转发 评论 ñ赞 评论 o p 同时转发到我的微博 按热度 按时间 正在加载,请稍候...北京衮雪科技有限公司 ü 审核时间 2022-04-20 T 友情链接 X-MOL平台 更多a 122关注 7601粉丝 8325微博 ...
Keywords:quantumadiabatictransition;Landau-Zenertunneling;two-levelmodel;BEC 独创性声明 本人声明所呈交的学位论文是我个人在导师指导下进行的研究工作及取得的 研究成果。尽我所知,除文中已经标明引用的内容外,本论文不包含任何其他个人 或集体已经发表或撰写过的研究成果。对本文的研究做出贡献的个人和集体,均已 ...
We study Landau-Zener transitions in a dissipative environment by means of the numerically exact quasiadiabatic propagator path integral. It allows to cover the full range of the involved parameters. We discover a nonmonotonic dependence of the transition probability on the sweep velocity which is ex...
The nature of the baths and the qubit-bath coupling is reflected in the transition probabilities. For diagonal coupling, when the bath causes energy fluctuations of the diabatic qubit states but no transitions between them, the transition probability coincides with the standard LZ probability of an ...
Summing an infinite-order perturbation series, we determine the exact nonadiabatic transition probability for the qubit, being independent of the frequency of the QED mode. Possible applications are single-photon generation and the controllable creation of qubit-oscillator entanglement....
For a SOC BEC, the Landau–Zener (LZ) transition between the dressed eigenlevels occurs as the BEC is accelerated through the SOC-avoided crossing, which corresponds to a breakdown of the spin momentum locking. In our scheme, two LZ pulses are separated by an intermediate holding period of ...
Adiabatic:{|ψ+⟩,|ψ−⟩}with energies{ϵ+,ϵ−} We consider the two limits long before and long after the nonadiabatic transition (see Fig. 1) Figure 1. Landau-Zener theory We write the general wavefunction as |\Psi(t)\rangle = A(t) |\phi_1\rangle + B(t) |\phi_2...