Squeezed optics

Sen Li, Hao-Zhen Li, Jingping Xu +2 more

All-optical diodes and all-optical transistors are the basis of all-optical logic devices. We study the quantum statistical properties of all-optical diodes based on cavity quantum electrodynamics (QED)[ 1 ], and discuss the squeezed properties of the output light after passing through the diode when coherent light and squeezed light are incident. Here we extend our research to all-optical transistor, and take all-optical transistor based on cavity optomechanical system as the research object. By changing the intensity of classical pump light, the all-optical transistor can effectively control the output of the probe light and realize optical amplification. We discuss the squeezed properties of the output light of the all-optical transistor with squeezed light and coherent light as the probe light. Our results show that when the probe light is coherent, the output light remains coherent no matter whether it works in the amplified region, and is not squeezed. When the input probe light is amplitude squeezed light, the output light is still squeezed light in the light amplification region of all-optical transistor, but the squeezed properties are modulated by the input light squeezed properties and system parameters. When the squeezed angle of the input probe squeezed light is 0°, the minimum squeezed parameter S1 of the output squeezed light decreases with the increase of the squeezed coefficient r of the input probe light, and the minimum value approaches to the squeezed limit of –0.25. But the change of squeezed angle of the input probe squeezed light changes has a great influence on the squeezed parameter S1,2 of the output light, and the squeezed properties will disappear. Only when the squeezed angle is an integer multiple of π, will the squeezed properties of the output light be best. This result has a potential application value in quantum measurement, weak signal detection, and other fields.

Ray LaPierre

Meihong Wang, Miao Zhang, Zhongzhong Qin +5 more

Abstract The squeezed cat state, an essential quantum resource, can be used for quantum error correction and slowing decoherence of the optical cat state. However, preparing a squeezed cat state with high generation rate, and effectively manipulating it, remain challenging. In this work, a high‐performance all‐optical in‐line squeezer is developed to prepare a squeezed cat state and manipulate the phase of the quadrature squeezing. This scheme has the advantages that the phase of the quadrature squeezing of the squeezed cat state can be manipulated by changing the working condition of the squeezer, and that a higher generation rate can be achieved via the deterministic squeezing operation of the in‐line squeezer. The generation rate of squeezed cat states reaches 2 kHz, the same as that of the initial cat state. The all‐optical in‐line squeezer proposed here removes the requirements of electro‐optic and opto‐electric conversions necessary for an off‐line squeezer, thus enabling high‐bandwidth squeezing operations on non‐Gaussian states. These results provide an efficient method to prepare and manipulate optical squeezed cat states, which makes a step closer to their applications in all‐optical quantum information processing.

Richart E. Slusher, Bernard Yurke

Harry Paul

Meihong Wang, Miao Zhang, Zhongzhong Qin +5 more

Optical Cat States In article number 2200336, Xiaolong Su and colleagues have developed an all-optical measurement-free in-line squeezer to prepare and manipulate optical squeezed cat states. The phase of the quadrature squeezing and squeezing parameter of the squeezed cat state are manipulated by changing the working condition of the in-line squeezer. The results provide a new method to prepare and manipulate optical squeezed cat states without losing their non-classicality.