Efficient Backcasting Search for Optical Quantum State Synthesis,Physical Review Letters

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Efficient Backcasting Search for Optical Quantum State Synthesis
Physical Review Letters ( IF 8.1 ) Pub Date : 2022-06-17 , DOI: 10.1103/physrevlett.128.240503
Kosuke Fukui ₁ , Shuntaro Takeda ₁ , Mamoru Endo ₁ , Warit Asavanant ₁ , Jun-Ichi Yoshikawa ₁ , Peter van Loock ₂ , Akira Furusawa _{1,

3}

Affiliation

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.

中文翻译：

光学量子态合成的高效反向搜索

非高斯状态对于许多光学量子技术是必不可少的。所谓的光学量子态合成器（OQSS）由高斯输入态、线性光学和光子数分辨探测器组成，是一种很有前途的非高斯态制备方法。然而，一个不可避免的关键问题是在经典计算机上对状态准备进行数值模拟的复杂性。这个问题使得生成高级量子信息处理所需的重要非高斯状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。为了规避这个问题，我们提供了一种采用回溯方法的方案，其中 OQSS 的电路被划分为一些子层，我们从最后一层到第一层向后模拟 OQSS。而且，我们的结果表明，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。凭借制备各种非高斯状态的潜力，所提出的 OQSS 可以成为一般光量子信息处理的关键成分。

更新日期：2022-06-17

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