Opt Express. 2023 Jan 30;31(3):3651-3659. doi: 10.1364/OE.479583.
Spatially structured quantum states, such as orbital angular momentum (OAM) squeezing and entanglement, is currently a popular topic in quantum optics. The method of generating and manipulating spatial quantum states on demand needs to be explored. In this paper, we generated OAM mode squeezed states of -5.4 dB for the 0+1 mode and -5.3 dB for the 0-1 mode directly by an optical parametric oscillator (OPO) for the first time. Additionally, we demonstrated that the OAM mode squeezed and entangled states were respectively generated by manipulating the nonlinear process of the OPO by controlling the relative phase of two beams of different modes, thus making two different spatial multimode pump beams. We characterized the Laguerre-Gaussian (LG) entangled states by indirectly measuring the squeezing for the mode and mode, and directly measuring the entanglement between the 0+1 and 0-1 modes. The effective manipulation of the OAM quantum state provides a novel insight into the continuous variable quantum state generation and construction on demand for high-dimensional quantum information and quantum metrology.
空间结构量子态，如轨道角动量（OAM）压缩和纠缠，是当前量子光学中的一个热门话题。需要探索按需生成和操纵空间量子态的方法。在本文中，我们首次通过光学参量振荡器（OPO）直接产生了-5.4dB 的 0+1 模式 OAM 模式压缩态和-5.3dB 的 0-1 模式 OAM 模式压缩态。此外，我们通过控制两束不同模式的相对相位来操纵 OPO 的非线性过程，从而产生两个不同的空间多模泵浦光束，演示了 OAM 模式压缩和纠缠态的产生。我们通过间接测量 模式和 模式的压缩来表征拉盖尔-高斯（LG）纠缠态，并直接测量 0+1 和 0-1 模式之间的纠缠。OAM 量子态的有效操纵为高维量子信息和量子计量学中按需连续变量量子态的产生和构建提供了新的思路。
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