论文标题
使用高斯脉冲优化宽带$λ$ -Type量子存储器
Optimization of Broadband $Λ$-type Quantum Memory Using Gaussian Pulses
论文作者
论文摘要
光学量子记忆 - 存储光子量子状态并按需检索的能力 - 是新兴量子技术和光子量子信息协议的重要资源。同时，宽带操作同时达到高效率和高速操作是实现这些应用程序所需的重要任务。在这项工作中，我们研究了基于共振的相互作用与$λ$ -Type级别系统的共振相互作用的优化，并限制了所有光场的时间封装必须是高斯，这会降低实验复杂性。我们表明，对于重叠的信号和控制字段，存在一个独特的宽带脉冲持续时间，可优化内存效率，并且这种优化的效率可以接近与协议无关的界限。我们进一步优化了控制场的时间延迟和脉冲持续时间，证明了这种效率在巨大脉冲持续时间内结合的饱和，同时阐明了量子记忆相互作用的基本物理。
Optical quantum memory--the ability to store photonic quantum states and retrieve them on demand--is an essential resource for emerging quantum technologies and photonic quantum information protocols. Simultaneously achieving high efficiency and high-speed, broadband operation is an important task necessary for enabling these applications. In this work, we investigate the optimization of a large class of optical quantum memory protocols based on resonant interaction with ensembles of $Λ$-type level systems with the restriction that the temporal envelope of all optical fields must be Gaussian, which reduces experimental complexity. We show that for overlapping signal and control fields there exists a unique and broadband pulse duration that optimizes the memory efficiency, and that this optimized efficiency can be close to the protocol-independent bound. We further optimize over the control field temporal delay and pulse duration, demonstrating saturation of this efficiency bound over a broad range of pulse durations while clarifying the underlying physics of the quantum memory interaction.
