Coherent control of BEC tunneling and generation of macroscopic entangled states

本项目从理论角度出发，研究双阱势下玻色-爱因斯坦凝聚体的受控操纵，制备高保真度Schrödinger cat态等纠缠多体态。这些状态对于基础物理学、探索经典物理学和量子物理学之间的边界以及揭示测量过程具有重要意义。它们在实际应用中也很重要，例如干涉测量、频率标准，以及可能的量子信息处理。在第一步中，先前讨论的单粒子隧穿相干破坏的概念将应用于玻色-爱因斯坦凝聚体。虽然这种效应需要对捕获势进行周期性的单色调制，但为了达到特定的目标状态，我们将在第二步中考虑系统参数的更一般变化。在第三步，我们将包括退相干机制，如原子损失，并优化我们的方案。

This project aims, from a theoretical viewpoint, at the controlled manipulation of Bose-Einstein condensates in double well potentials, and the preparation of entangled many-body states, such as high-fidelity Schrödinger cat states. These states are of principal interest for fundamental physics, for exploring the boundary between classical and quantum physics and for shedding light on the measurement process. They are also important for practical applications, such as interferometry, frequency standards, and possibly quantum information processing. In a first step, the concept of coherent destruction of tunneling, previously discussed for single particles, will be applied to Bose-Einstein condensates. While this effect requires a periodic, monochromatic modulation of the trapping potential, we will consider more general variations of the system parameters in a second step, in order to reach specific target states. In a third step, we will include decoherence mechanisms, such as atom loss, and optimize our schemes.