Experimental Generation of Multimode Squeezing in an Optical Parametric Amplifier

We experimentally demonstrate that HG01 (Hermit—Gauss) and HG10 squeezed states can be generated simultaneously in an optical parametric amplifier. The HG01 mode is a bright squeezed state and the HG10 mode is a vacuum squeezed state. The squeezing of the HG01 mode is −2.8 dB, and the squeezing of the HG10 mode is −1.6 dB. We also demonstrate that the output field is also continuous-variable entanglement with orbital angular momentum.