论文标题
改善量子状态转移：纠正非马克维亚和失真效应
Improving quantum state transfer: Correcting non-Markovian and distortion effects
论文作者
论文摘要
量子状态转移是量子信息处理的关键操作。原始的俯仰和捕获协议依赖于具有工程波袋形状的飞行Qubits或单个光子，以实现确定性，快速和高保真的转移。然而，这些方案忽略了两个重要因素，即在传播过程中波袋的扭曲和由于时间依赖性控制而引起的发射和重吸收过程期间的非马克维亚效应。在这里，我们解决了通用量子光学模型中的这两个困难，并提出了改进策略以改善量子状态转移方案。在我们的理论描述中包括非马克维亚效应，我们展示了如何得出对控制脉冲，这些脉冲将脉冲标记在波袋上，以补偿由传播引起的失真。我们的理论结果得到了详细的数值模拟的支持，表明合适的校正策略可以提高状态转移的保真度最高三个数量级。
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.
