论文标题
在一个强耦合Qubit的系统中，逐渐辅助的纠缠
Dephasing-assisted entanglement in a system of strongly coupled qubits
论文作者
论文摘要
建立具有低解相化率的量子系统的纠缠状态是实用量子计算实施的基石。在实验可行的系统中，每个量子的单独dephasing的过程通常被接受以破坏纠缠。在这项工作中，我们考虑了一个与dephasing储层相互作用的两个强耦合量子位的系统。我们证明，与dephasing储层的相互作用可以有助于形成具有非零同时发生的长期混合纠缠状态。如果脱位速率远大于辐射速率，并且小于量子量线之间的耦合常数，则在这种混合状态下次值状态的重量趋向于统一。该状态的寿命与耦合常数与环境温度之比的指数成正比，并且可以按数量级大于系统的特征性驱动和耗散时间。因此，高度逐步的效果以及强大的耦合，有助于创建长寿的纠缠状态。这个结果为建立长寿的状态铺平了道路。
Creation of entangled states of quantum systems with low decoherence rates is a cornerstone in practical implementation of quantum computations. Processes of separate dephasing in each qubit in experimentally feasible systems is commonly accepted to destroy entanglement. In this work, we consider a system of two strongly coupled qubits that interact with dephasing reservoirs. We demonstrate that interaction with dephasing reservoirs can contribute to the formation of a long-lived mixed entangled state with nonzero concurrence. The weight of the subradiant state in this mixed state tends toward unity if the dephasing rate is much larger than the radiative rate and less than the coupling constant between qubits. The lifetime of this state is proportional to the exponent of the ratio of the coupling constant to environmental temperature and can be, by orders of magnitude, larger than the system's characteristic dephasing and dissipation times. Therefore, high dephasing, along with strong coupling, contributes to the creation of an entangled state with a long lifetime. This result paves the way for creation of long-lived entangled states.
