Division of Materials Science, Nanyang Technological University, Singapore 639798, Singapore.
J Chem Phys. 2013 Jul 28;139(4):044115. doi: 10.1063/1.4816122.
Developed originally for the Holstein polaron, the Davydov D1 ansatz is an efficient, yet extremely accurate trial state for time-dependent variation of the spin-boson model [N. Wu, L. Duan, X. Li, and Y. Zhao, J. Chem. Phys. 138, 084111 (2013)]. In this work, the Dirac-Frenkel time-dependent variational procedure utilizing the Davydov D1 ansatz is implemented to study entanglement dynamics of two qubits under the influence of two independent baths. The Ohmic spectral density is used without the Born-Markov approximation or the rotating-wave approximation. In the strong coupling regime finite-time disentanglement is always found to exist, while at the intermediate coupling regime, the entanglement dynamics calculated by Davydov D1 ansatz displays oscillatory behavior in addition to entanglement disappearance and revival.
最初为霍尔斯坦极化子开发的 Davydov D1 假设是时间相关的自旋-玻色子模型 [N. Wu, L. Duan, X. Li, and Y. Zhao, J. Chem. Phys. 138, 084111 (2013)] 的一种有效且非常精确的试探态。在这项工作中，利用 Davydov D1 假设的狄拉克-弗伦克尔时变变分程序被用来研究两个独立的浴对两个量子位的纠缠动力学的影响。Ohmic 谱密度在没有 Born-Markov 近似或旋转波近似的情况下被使用。在强耦合 regime 中，总是会发现有限时间的去纠缠存在，而在中间耦合 regime 中，除了纠缠的消失和恢复之外，Davydov D1 假设计算的纠缠动力学还显示出了振荡行为。
