Bilitewski Thomas, De Marco Luigi, Li Jun-Ru, Matsuda Kyle, Tobias William G, Valtolina Giacomo, Ye Jun, Rey Ana Maria
JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, Colorado, 80309, USA.
Center for Theory of Quantum Matter, University of Colorado, Boulder, Colorado, 80309, USA.
Phys Rev Lett. 2021 Mar 19;126(11):113401. doi: 10.1103/PhysRevLett.126.113401.
We study a bulk fermionic dipolar molecular gas in the quantum degenerate regime confined in a two-dimensional geometry. Using two rotational states of the molecules, we encode a spin 1/2 degree of freedom. To describe the many-body spin dynamics of the molecules, we derive a long-range interacting XXZ model valid in the regime where motional degrees of freedom are frozen. Because of the spatially extended nature of the harmonic oscillator modes, the interactions in the spin model are very long ranged, and the system behaves close to the collective limit, resulting in robust dynamics and generation of entanglement in the form of spin squeezing even at finite temperature and in the presence of dephasing and chemical reactions. We discuss how the internal state structure can be exploited to realize time reversal and enhanced metrological sensing protocols.
我们研究了一种处于量子简并态的体费米子偶极分子气体，该气体被限制在二维几何结构中。利用分子的两个转动状态，我们编码了一个自旋1/2自由度。为了描述分子的多体自旋动力学，我们推导了一个在运动自由度被冻结的 regime 中有效的长程相互作用XXZ模型。由于谐振子模式的空间扩展性质，自旋模型中的相互作用范围非常长，并且系统的行为接近集体极限，即使在有限温度以及存在退相和化学反应的情况下，也能产生稳健的动力学并以自旋压缩的形式产生纠缠。我们讨论了如何利用内部态结构来实现时间反演和增强的计量传感协议。
