Reddy Dileep V, Raymer Michael G
Opt Express. 2018 Oct 15;26(21):28091-28103. doi: 10.1364/OE.26.028091.
Photonic temporal modes (TMs) form a field-orthogonal basis set representing a continuous-variable degree of freedom that is in principle infinite dimensional, and create a promising resource for quantum information science and technology. The ideal quantum pulse gate (QPG) is a device that multiplexes and demultiplexes temporally orthogonal optical pulses that have the same carrier frequency, spatial mode, and polarization. The QPG is the chief enabling technology for usage of orthogonal temporal modes as a basis for high-dimensional quantum information storage and processing. The greatest hurdle for QPG implementation using nonlinear-optical, parametric processes with time-varying pump or control fields is the limitation on achievable temporal mode selectivity, defined as perfect TM discrimination combined with unity efficiency. We propose the use of pulsed nonlinear frequency conversion in an optical cavity having greatly different finesses for different frequencies to implement a nearly perfectly TM-selective QPG in a low-loss integrated-optics platform.
光子时间模式（TMs）构成了一个场正交基集，代表了一种原则上无限维的连续变量自由度，并为量子信息科学与技术创造了一种有前景的资源。理想的量子脉冲门（QPG）是一种对具有相同载波频率、空间模式和偏振的时间正交光脉冲进行复用和解复用的装置。QPG是将正交时间模式用作高维量子信息存储和处理基础的主要 enabling 技术。使用具有随时间变化的泵浦或控制场的非线性光学参量过程来实现QPG的最大障碍是可实现的时间模式选择性的限制，其定义为完美的TM分辨与单位效率相结合。我们建议在具有不同频率的极大不同精细度的光学腔中使用脉冲非线性频率转换，以在低损耗集成光学平台中实现近乎完美的TM选择性QPG。
