后选择基础之外操作线性光学量子计算的单光子器件要求
Single-photon device requirements for operating linear optics quantum computing outside the post-selection basis
摘要：
光子学是实现量子信息处理的有前途的架构，因为构建逻辑门所需的双光子相互作用或非线性可以通过使用辅助光子的干涉和检测来有效地实现。虽然单光子源和探测器是实现这类系统的关键，但现实系统所需性能的明确准则尚未确定。我们提出了我们的详细的数值模拟的几个量子光学电路，包括源和检测器都表示在多维Fockspaces，这允许获得实验现实的性能界限为这些设备。此外，本文还研究了基于开关参量下转换的单光子源，该光源在原理上可以达到要求的性能。模拟了实现光子开关层次的三种方法，并得到了它们的预期性能。我们的研究结果定义了符合基础之外实现线性光学量子计算第一级所需的光学器件的标准。
英文摘要：
Photonics is a promising architecture for the realisation of quantum information processing, since the two-photon interaction, or non-linearity, necessary to build logical gates can efficiently be realised by the use of interference with ancillary photons and detection. Although single-photon sources and detectors are pivotal in realisations of such systems, clear guidelines for the required performance of realistic systems are yet to be defined. We present our detailed numerical simulation of several quantum optics circuits including sources and detectors all represented in multi-dimensional Fockspaces, which allows to obtain experimentally realistic performance bounds for for these devices. In addition, the single-photon source based on switched parametric down-conversion is studied, which in principle could reach the required performance. Three approaches for implementing the switching hierarchy of the photons are simulated, and their anticipated performance is obtained. Our results define the bar for the optical devices needed to achieve the first level of linear-optics quantum computing outside the coincidence basis.
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