宏观相干量子存储器中频率箱量子比特的确定性合成与处理
Deterministic synthesis and processing of frequency-bin qubits in a macroscopically coherent quantum memory
- Kazan National Research Technical University n.a. A.N. Tupolev-KAI（喀山国立研究技术大学（以A.N. 图波列夫命名））
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文提出基于预创建长寿命宏观相干性的腔辅助量子存储器协议，利用自旋相干性作为量子总线，通过光谱非局域阻抗匹配实现频率箱量子比特的确定性合成与存储，并展示统一存储与处理平台。
AI中文摘要：
量子信息处理需要高效的光子存储和操控。本文提出了一种基于预创建长寿命宏观（PLM）相干性的腔辅助量子存储器协议，从而将量子存储器从被动存储设备转变为确定性内存光子处理平台。研究表明，自旋PLM相干性仅通过鲁棒的射频旋转即可实现对量子存储器的全光控制。在此，自旋相干性充当分布式相干量子总线，通过光谱非局域阻抗匹配介导频率箱态的确定性合成与存储。我们识别出底层动力学方程中固有的时间反演对称性，确保量子存储器操作的幺正演化。所呈现的结果展示了一个统一的量子存储与光信号处理平台，能够实现频率箱光子量子比特的受控操控，并为基于光谱编码架构的可扩展多模量子网络铺平了道路。
英文摘要：
Quantum information processing requires efficient storage and manipulation of photonic states. In this work, we harness pre-created macroscopic spin coherence as an additional degree of freedom to control a cavity-assisted quantum memory. We derive equations of motion for such a memory that predict efficient emission and absorption of two-color fields under a generalized nonlocal spectral impedance-matching condition, which reduces to the well-known condition in the single-mode case. These equations reveal a new operating mechanism of cavity-assisted quantum memory wherein the controlled spin coherence couples the emitted spectral modes. As a result, our memory deterministically synthesizes arbitrary frequency-bin photonic qubits using simple radio-frequency rotations, while the temporal reversibility of the protocol provides perfect transformation of the qubit states. Our findings establish a unified platform bridging quantum storage with elementary signal processing for quantum networks based on spectral encoding of photonic qubits.
