Beating the limits with initial correlations
Beating the limits with initial correlations
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DOI：
10.1088/1367-2630/aa96f8
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发表时间：
2017-03
影响因子：
3.3
通讯作者：
Daniel Basilewitsch;R. Schmidt;D. Sugny;S. Maniscalco;C. Koch
中科院分区：
文献类型：
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作者：
Daniel Basilewitsch;R. Schmidt;D. Sugny;S. Maniscalco;C. Koch
快速可靠地重置量子比特是任何量子技术的关键先决条件。对于经历非马尔可夫动力学的现实世界开放量子系统，重置不仅意味着净化，而且特别意味着消除量子比特与环境之间的初始相关性。在这里，我们使用几何和数值控制理论的组合导出最优复位协议。对于初始状态的因式分解，我们找到了量子位熵减少的下限以及速度限制。时间最优解由最大耦合强度决定。值得注意的是，初始相关性允许更快的重置和更小的错误。没有必要纠结。
Fast and reliable reset of a qubit is a key prerequisite for any quantum technology. For real world open quantum systems undergoing non-Markovian dynamics, reset implies not only purification, but in particular erasure of initial correlations between qubit and environment. Here, we derive optimal reset protocols using a combination of geometric and numerical control theory. For factorizing initial states, we find a lower limit for the entropy reduction of the qubit as well as a speed limit. The time-optimal solution is determined by the maximum coupling strength. Initial correlations, remarkably, allow for faster reset and smaller errors. Entanglement is not necessary.