Optimizing Performance of Quantum Operations with Non-Markovian Decoherence: The Tortoise or the Hare?
Optimizing Performance of Quantum Operations with Non-Markovian Decoherence: The Tortoise or the Hare?
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DOI：
10.1103/physrevlett.132.060401
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发表时间：
2023-03
影响因子：
8.6
通讯作者：
Eoin Butler;Gerald E. Fux;B. Lovett;Jonathan Keeling;P. Eastham
中科院分区：
文献类型：
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作者：
Eoin Butler;Gerald E. Fux;B. Lovett;Jonathan Keeling;P. Eastham
量子系统与环境之间的相互作用限制了我们对其进行控制和量子操作的能力.本文提出了一种有效的方法来寻找耦合到非马尔可夫环境的量子系统的最优控制，通过使用过程张量来计算目标函数的梯度.我们考虑耦合到玻色子环境的驱动二能级系统的状态转移，并在速度和保真度方面表征性能。这使我们能够确定最佳可实现的保真度作为过程持续时间的函数。我们发现，速度和保真度之间可以有一个权衡，并且通过利用非马尔可夫效应，较慢的过程可以具有更高的保真度。
The interaction between a quantum system and its environment limits our ability to control it and perform quantum operations on it. We present an efficient method to find optimal controls for quantum systems coupled to non-Markovian environments, by using the process tensor to compute the gradient of an objective function. We consider state transfer for a driven two-level system coupled to a bosonic environment, and characterize performance in terms of speed and fidelity. This allows us to determine the best achievable fidelity as a function of process duration. We show there can be a trade-off between speed and fidelity, and that slower processes can have higher fidelity by exploiting non-Markovian effects.