标题： 玻色系统中由增强的量子Zeno效应稳定的Landau-Zener跃迁 显示英文标题

标题： Landau-Zener transition stabilized by the enhanced quantum Zeno effect in the bosonic system

摘要： 我们研究在开放耗散系统中具有量子Zeno效应的Landau-Zener跃迁，该系统由大量玻色子填充。 给定量子Zeno效应足够强，发现离散和连续的量子Zeno测量都能稳定Landau-Zener跃迁。 玻色系统中的$\sigma^x$型纵向弛豫和$\sigma^z$型横向弛豫被分析为连续量子Zeno测量的模型。 虽然它们都能在基态占据数方面提高信噪比，但$\sigma^x$型弛豫可以进一步提升测量灵敏度，从而导致系统中玻色子数量的多项式加速。 对于包含大量玻色子的系统，如含有超过$10^4$个玻色子的玻色-爱因斯坦凝聚体，这相当于几个数量级的加速。 显示英文摘要

摘要： We study the Landau-Zener transition with the quantum Zeno effect in an open dissipative system populated by a large number of bosons. Given the quantum Zeno effect is strong enough, both discrete and continuous quantum Zeno measurements are found to stabilize the Landau-Zener transition. Both the $\sigma^x$-type longitudinal relaxation and $\sigma^z$-type transverse relaxation in the bosonic system are analyzed as a model of continuous quantum Zeno measurements. While both of them improve the signal-to-noise ratio in terms of the ground state population, the $\sigma^x$-type relaxation can further boost measurement sensitivity and thus lead to a polynomial speedup with the number of bosons in the system. For a system that contains a large number of bosons such as in a Bose-Einstein condensate with more than $10^4$ bosons, this equates to several orders of magnitude speedup.