论文标题
噪声连续变量系统的量子速度极限
Quantum speed limit of a noisy continuous-variable system
论文作者
论文摘要
设置量子系统的最小时间结合以在两个可区分状态之间发展，量子速度限制（QSL）表征了加速系统的潜在能力。它在确定许多量子技术中的量子优势方面发现了应用。但是，先前的结果表明，这种加速能力通常被伯恩 - 马尔可夫近似动力学的环境诱发的破坏破坏。我们在这里提出了一个方案，以在确切的非马克维亚框架内恢复耗散性连续变化系统中的加速能力。发现在由系统及其环境组成的总系统的能源谱系中形成了一个结合状态，可用于将QSL恢复为其无噪声性能。我们的计划提供了保存QSL的内在机制，提供了一个指南，以加快实际连续变量系统中的某些量子任务。
Setting the minimal-time bound for a quantum system to evolve between two distinguishable states, the quantum speed limit (QSL) characterizes the latent capability in speeding up of the system. It has found applications in determining the quantum superiority in many quantum technologies. However, previous results showed that such a speedup capability is generally destroyed by the environment induced decoherence in the Born-Markovian approximate dynamics. We here propose a scheme to recover the speedup capability in a dissipative continuous-variable system within the exact non-Markovian framework. It is found that the formation of a bound state in the energy spectrum of the total system consisting of the system and its environment can be used to restore the QSL to its noiseless performance. Giving an intrinsic mechanism in preserving the QSL, our scheme supplies a guideline to speed up certain quantum tasks in practical continuous-variable systems.
