改进量子态传输：修正非马尔可夫与畸变效应
Improving quantum state transfer: Correcting non-Markovian and distortion effects
AI总结：
针对量子态传输中波包畸变和非马尔可夫效应问题，提出一种通用量子光学模型下的修正策略，通过推导控制脉冲补偿畸变，可将传输保真度提升至三个数量级。
摘要：
量子态传输是量子信息处理的关键操作。原始的pitch-and-catch协议依赖飞行量子比特或具有工程化波包形状的单光子，以实现确定性、快速和高保真度的传输。然而，这些协议忽略了两个重要因素，即传播过程中波包的畸变，以及由于时间相关控制导致在发射和重吸收过程中的非马尔可夫效应。在此，我们在一个通用量子光学模型中解决了这两个难题，并提出了一种改进量子态传输协议的修正策略。在我们的理论描述中包含非马尔可夫效应后，我们展示了如何推导出在波包上印刻相位以补偿传播引起畸变的控制脉冲。我们的理论结果得到了详细数值模拟的支持，表明合适的修正策略可将态传输保真度提高至三个数量级。
英文摘要：
Quantum state transfer is a key operation for quantum information processing. The original pitch-and-catch protocols rely on flying qubits or single photons with engineered wavepacket shapes to achieve a deterministic, fast and high-fidelity transfer. Yet, these protocols overlook two important factors, namely, the distortion of the wavepacket during the propagation and non-Markovian effects during the emission and reabsorption processes due to time-dependent controls. Here we address both difficulties in a general quantum-optical model and propose a correction strategy to improve quantum state transfer protocols. Including non-Markovian effects in our theoretical description, we show how to derive control pulses that imprint phases on the wavepacket that compensate the distortion caused by propagation. Our theoretical results are supported by detailed numerical simulations showing that a suitable correction strategy can improve state transfer fidelities up to three orders of magnitude.
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