论文标题
对数量子时间晶体
Logarithmic quantum time crystal
论文作者
论文摘要
我们研究了一个独立的多个玻色子系统，其基态是准脱位，并在热力学极限下变得无限退化。在这些准脱位基础状态中，我们构建了一个量子状态，该量子状态随着对数与颗粒数量成正比的时期（即t〜ogn）成正比。这种状态下的玻色子系统是量子时间晶体，因为它接近热力学极限的基态。其周期对总粒子数n的对数依赖性也使其在实验上也可以观察到，即使对于大量粒子的系统也是如此。讨论了可能的实验建议。
We investigate a time-independent many-boson system, whose ground states are quasi-degenerate and become infinitely degenerate in the thermodynamic limit. Out of these quasi-degenerate ground states we construct a quantum state that evolves in time with a period that is logarithmically proportional to the number of particles, that is, T~logN. This boson system in such a state is a quantum time crystal as it approaches the ground state in the thermodynamic limit. The logarithmic dependence of its period on the total particle number N makes it observable experimentally even for systems with very large number of particles. Possible experimental proposals are discussed.
