Efficient Backcasting Search for Optical Quantum State Synthesis
Efficient Backcasting Search for Optical Quantum State Synthesis
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DOI：
10.1103/physrevlett.128.240503
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发表时间：
2022-06-17
影响因子：
8.6
通讯作者：
Furusawa, Akira
中科院分区：
文献类型：
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作者：
Fukui, Kosuke;Takeda, Shuntaro;Furusawa, Akira
非高斯态对于许多光量子技术是必不可少的。光量子态合成器（OQSS）由高斯输入态、线性光学系统和光子数分辨探测器组成，是一种很有前途的制备非高斯态的方法。然而，一个不可避免的和关键的问题是在经典计算机上的状态准备的数值模拟的复杂性。这个问题使得产生高级量子信息处理所需的重要非高斯态变得非常具有挑战性。因此，非常需要一种设计OQSS电路的有效方法。为了避免这个问题，我们提供了一个计划，采用回溯的方法，其中的电路的OQSS被划分为一些子层，我们模拟的OQSS向后从最后到第一层。此外，我们的研究结果表明，每个探测器探测到的光子数最多为2，这可以显着降低对光子数分辨探测器的要求。由于具有制备各种非高斯态的潜力，所提出的OQSS可以成为一般光量子信息处理的关键成分。
Non-Gaussian states are essential for many optical quantum technologies. The so-called optical quantum state synthesizer (OQSS), consisting of Gaussian input states, linear optics, and photon-number resolving detectors, is a promising method for non-Gaussian state preparation. However, an inevitable and crucial problem is the complexity of the numerical simulation of the state preparation on a classical computer. This problem makes it very challenging to generate important non-Gaussian states required for advanced quantum information processing. Thus, an efficient method to design OQSS circuits is highly desirable. To circumvent the problem, we offer a scheme employing a backcasting approach, where the circuit of OQSS is divided into some sublayers, and we simulate the OQSS backwards from final to first layers. Moreover, our results show that the detected photon number by each detector is at most 2, which can significantly reduce the requirements for the photon-number resolving detector. By virtue of the potential for the preparation of a wide variety of non-Gaussian states, the proposed OQSS can be a key ingredient in general optical quantum information processing.