论文标题
通过两个驱动场设计的非热塔维斯 - 卡明模型中的实验可访问的量子相变
Experimentally Accessible Quantum Phase Transition in a non-Hermitian Tavis-Cummings Model Engineered with Two Drive Fields
论文作者
论文摘要
我们研究了实验可访问的参数的非热塔维斯 - 夏令山（TC）模型中的量子相变（QPT），该参数分别由两个驱动场（分别应用于两级系统（TLSS）和一个腔体的集合进行设计。当两个驱动场满足给定参数匹配条件时，可以通过旋转框架中有效的标准TC Hamiltonian描述耦合的腔体-TLS集合系统。在这种理想的赫米尔人案例中，工程的TC模型可以在实验可访问的临界耦合强度下显示具有旋转保护的超级QPT，但是QPT被脱碳损坏。我们发现，在这种非炎性情况下，可以通过引入腔体的增益来平衡TLS集合的损失来恢复QPT。同样，由于系统的破坏，发现自旋保存定律被违反。我们的研究提供了一种实验可实现的方法，可以在非热门TC模型中实施QPT。
We study the quantum phase transition (QPT) in a non-Hermitian Tavis-Cummings (TC) model of experimentally accessible parameters, which is engineered with two drive fields applied to an ensemble of two-level systems (TLSs) and a cavity, respectively. When the two drive fields satisfy a given parameter-matching condition, the coupled cavity-TLS ensemble system can be described by an effective standard TC Hamiltonian in the rotating frame. In this ideal Hermitian case, the engineered TC model can exhibit the super-radiant QPT with spin conservation at an experimentally accessible critical coupling strength, but the QPT is, however, spoiled by the decoherence. We find that in this non-Hermitian case, the QPT can be recovered by introducing a gain in the cavity to balance the loss of the TLS ensemble. Also, the spin-conservation law is found to be violated due to the decoherence of the system. Our study offers an experimentally realizable approach to implementing QPT in the non-Hermitian TC model.
