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arXiv 2404.09487quant-ph
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用于飞行量子比特整形的量子最优控制理论

Quantum Optimal Control Theory for the Shaping of Flying Qubits

Xue Dong, Xi Cao, Wen-Long Li, Guofeng Zhang, Zhihui Peng, Re-Bing Wu

AI总结:

本文将量子最优控制理论引入飞行量子比特整形,通过设计目标泛函和梯度下降优化,在非理想发射器与耦合器条件下抑制能级和光子泄漏,并证明结合受限可调耦合器可显著提升整形性能。

摘要:

由流动光子携带的飞行量子比特的控制在量子网络中无处不在。除了逻辑态之外,飞行量子比特的形状也必须被定制,以实现高效的信息传输。本文我们将量子最优控制理论引入飞行量子比特的整形中。基于我们先前工作中建立的飞行量子比特控制模型,我们设计了在发射器和耦合器实际约束条件下生成整形飞行量子比特的目标泛函。采用梯度下降算法的数值模拟表明,优化后的控制能够有效抑制由这些非理想因素引起的不需要的能级泄漏和光子泄漏。值得注意的是,在耦合器固定的情况下,相干控制的整形能力有限,但当与具有受限可调性的可调耦合器结合时,它可以显著提升整形性能。所提出的最优控制框架为使用现实量子器件实现飞行量子比特的高质量控制提供了一种系统化方法。

英文摘要:

The control of flying qubits carried by itinerant photons is ubiquitous in quantum networks. Beside their logical states, the shape of flying qubits must also be tailored for high-efficiency information transmission. In this paper, we introduce quantum optimal control theory to the shaping of flying qubits. Building on the flying-qubit control model established in our previous work, we design objective functionals for the generation of shaped flying qubits under practical constraints on the emitters and couplers. Numerical simulations employing gradient-descent algorithms demonstrate that the optimized control can effectively mitigate unwanted level and photon leakage caused by these non-idealities. Notably, while coherent control offers limited shaping capacity with a fixed coupler, it can significantly enhance the shaping performance when combined with a tunable coupler that has restricted tunability. The proposed optimal control framework provides a systematic approach to achieving high-quality control of flying qubits using realistic quantum devices.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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