发表机构
Università degli Studi di Milano; Istituto Nazionale di Fisica Nucleare, Sezione di Milano; Istituto di Fotonica e Nanotecnologie - CNR（米兰大学; 意大利国家核物理研究所米兰分部; 光子与纳米技术研究所-意大利国家研究委员会）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用低损耗体铌酸锂电光调制器，在93 MHz重复率下实现压缩真空态逐脉冲相位控制，验证了产生后量子态相位操控的可行性。
AI 中文摘要
连续变量量子态的时域复用为光子量子信息处理提供了一种可扩展的方法，其中单个时间模式可以在共同的光学路径内被顺序操控。在此，我们展示了在93 MHz重复率下，利用由宽带射频功率放大器驱动的低损耗体铌酸锂电光调制器，对压缩真空态进行脉冲分辨的产生后相位控制。该驱动架构利用了低成本、商用现成的射频组件以及射频链路与电容性晶体负载之间的阻抗失配，而非依赖专用的定制高压电子器件，从而在调制器上获得较大的电压摆动，同时工作在铌酸锂的压电共振区域之上。调制器与光脉冲序列同步驱动，使得连续时间模式的相位可以被单独控制。干涉校准测得最大差分相位摆动为1.93弧度。我们将该调制器应用于由同步泵浦光学参量振荡器产生的1035 nm压缩真空场，并使用时间分辨平衡零差探测对输出进行表征。在保持本振相位固定的情况下，压缩态的相位逐脉冲变化，并重构相应的相位相关正交方差。所得正交扫描与通过压电致动器改变本振相位获得的等效测量结果一致。这些结果展示了在单脉冲层面上的产生后量子态相位控制，并为可重循环光学架构中时间复用量子态的可编程操控提供了电光构建模块。
英文摘要
Time-domain multiplexing of continuous-variable quantum states provides a scalable approach to photonic quantum information processing, in which individual temporal modes can be sequentially manipulated within a common optical path. Here we demonstrate pulse-resolved post-generation phase control of squeezed-vacuum states at a repetition rate of 93 MHz using a low-loss bulk lithium-niobate electro-optic modulator driven by a broadband RF power amplifier. The driving architecture exploits low-cost, commercially available RF components and the impedance mismatch between the RF chain and the capacitive crystal load, rather than relying on dedicated custom high-voltage electronics, to obtain large voltage excursions on the modulator while operating above the piezoelectric-resonance region of lithium niobate. The modulator is driven synchronously with the optical pulse train, enabling the phase of consecutive temporal modes to be individually controlled. An interferometric calibration yields a maximum differential phase excursion of 1.93 rad. We apply the modulator to a 1035 nm squeezed-vacuum field generated by a synchronously pumped optical parametric oscillator and characterize the output using time-resolved balanced homodyne detection. With the local-oscillator phase kept fixed, the phase of the squeezed state is varied from pulse to pulse, and the corresponding phase-dependent quadrature variance is reconstructed. The resulting quadrature scan agrees with an equivalent measurement obtained by varying the local-oscillator phase with a piezoelectric actuator. These results demonstrate post-generation quantum-state phase control at the individual-pulse level and provide an electro-optic building block for programmable manipulation of time-multiplexed quantum states in recirculating optical architectures.
