Mechler Matyas, Adam Peter
Institute for Solid State Physics and Optics, HUN-REN Wigner Research Centre for Physics, P.O. Box 49, Budapest, 1525, Hungary.
Institute of Physics, University of Pécs, Ifjúság útja 6, Pécs, 7624, Hungary.
Sci Rep. 2025 May 29;15(1):18939. doi: 10.1038/s41598-025-03852-5.
We develop a method for optimizing the structure of general binary-tree multiplexers realized with asymmetric photon routers aiming at improving the performance of spatially multiplexed single-photon sources. Our procedure systematically considers all possible binary-tree multiplexers that can be constructed using a certain number of photon routers. Using this method one can select the multiplexer structure that leads to the highest single-photon probability for a given set of loss parameters characterizing the system. We determine the optimal general binary-tree multiplexers for experimentally realizable values of the transmission coefficients of the photon routers and that of the detector efficiency. We show that single-photon sources based on such optimal multiplexers yield higher single-photon probabilities than what can be achieved with single-photon sources based on any other spatial multiplexer considered in the literature. Our approach improves the performance of multiplexed single-photon sources even for small system sizes which is the typical situation in current experiments.
我们开发了一种方法，用于优化由非对称光子路由器实现的通用二叉树复用器的结构，旨在提高空间复用单光子源的性能。我们的程序系统地考虑了使用一定数量的光子路由器可以构建的所有可能的二叉树复用器。使用这种方法，可以为表征系统的给定一组损耗参数选择导致最高单光子概率的复用器结构。我们针对光子路由器的传输系数和探测器效率的实验可实现值确定了最优通用二叉树复用器。我们表明，基于这种最优复用器的单光子源产生的单光子概率高于基于文献中考虑的任何其他空间复用器的单光子源所能达到的概率。即使对于小系统规模（这是当前实验中的典型情况），我们的方法也能提高复用单光子源的性能。
