Quantum Optics and Light

Miguel Orszag

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.

BI Si-wen

In the mid-18th century, Isaac Newton regarded light as some extremely small particles. Based on this, Newton established the particle theory of light. In the mid-19th century, Huygens and Augustine Jean Fresnel conducted extensive research on light and concluded that light is a wave. Afterwards, Maxwell proposed the theory of electromagnetism. Maxwell believed that light is a wave with a wavelength within a limited range. With the establishment of Maxwell's equation electromagnetic wave theory, the wave nature of light began to dominate the mainstream consciousness; However, in the late 19th century, a series of experimental phenomena represented by the photoelectric effect could not be accurately explained by the wave theory of light. In 1905, Einstein proposed the concept of light quanta and successfully explained the photoelectric effect. While perfectly explaining these issues, a new question arises: what is the essence of light, given that both particle and wave properties can accurately reflect certain properties of light? It has always been the most fiercely debated issue in the history of optics. Einstein said that we are not yet clear about what light quanta are, and wave particle duality cannot fully explain optical phenomena. Based on the study of Albert Einstein's concept of quanta light, wave particle duality of light, string theory, and optical frequency combs, the author proposes the concept of lightstring, attempting to propose new ideas for studying the essence of light and its generation mechanism. Siwen Bi has been researching quantum remote sensing since March 2000 and quantum spectral imaging since June 2003, but has encountered some difficulties and problems. What is the basic theory of passive imaging in quantum remote sensing? How is technology implemented? What is the fundamental theory of quantum spectroscopy? The Implementation Technology of Quantum Optical Field Entangled States in Long Distance Quantum Detection Process? These difficulties and questions prompt the author of this article to contemplate and study the essence of light? What is the fundamental theory of the future technology of quantum optics? Siwen Bi conducted exploratory research on the nature of light in 2006. This article first provides an overview of the development history and research status of optics and describes the difficulties and shortcomings in fully explaining optical phenomena due to the wave particle duality of light quantum and light; Then, two inspiring viewpoints on optical frequency comb and chord theory were introduced. On this basis, the basic concept of optical string (optical frequency string), the prototype description of optical string, the mechanism of optical string generation, and the discussion of Lightstring, generation process are proposed and emphasized; Proposed the mechanism of string light effect. Published On Two Heuristic Viewpoints Concerning the Study of Light (October 13-15, 2014), New Viewpoints In Light Quantum Research: Lightstring (2016), Discuss wave-particle duality of light, (February 28, 2017), and an Exploratory research on the light quantum future technical basis (February 1, 2019). Over the past 17 years, achieved some original and innovative research results. some original innovative research achievements have been achieved. Received high praise from international scholars and professors, such as the American Journal of Physics and Applications, which sent me a congratulatory letter saying, "Dear Bi Siwen, Warmest greeting from the Editorial Department! It is reported that at the International conference on photo and optical Engineering (ICPOE 2014), a paper entitled" Two Enlightening Views on Optical Research "was published, and the theme of the paper impressed us deeply. It has attracted the attention of Photon researchers and Scholars ...Your research is highly appreciated by us … " And invite Professor Bi Siwen as a paper reviewer for the American Journal of Physics and Applications. I have received the paper review certificate, dated May 25th, 2018. Based on the above research, Siwen Bi elaborated on the geometric and kinematic characteristics of Lightstring, and proposed the essence of light based on the concept of Lightstring, in order to concretize the concept of light quanta. On this basis, the mechanism of string light effect based on the concept of optical string is proposed. An attempt has been made to further study the quantum and wave particle duality of light, gain a profound understanding of the nature of light, and answer the question "What is light?" by proposing a new approach and method for studying the nature of light and its generation mechanism. Proposed a study on optical quantum; The wave particle duality of light; New ideas, methods, and perspectives on the mechanism of light generation.

Gerard J Milburn

David K. Ferry, Mihail Nedjalkov

Kong Yong-Fa

Some recent work on weak-light nonlinear optics is presented,such as the defect structure in weak-light nonlinear photonic materials,light propagation dynamics in mesoscopic quantum coherent ensemble,optical nonlinearity at ultraslow group velocity of light and so on.The recent research results in new type exciton with ultraviolet weak-light nonlinear optical effect,the phase coupling with light speed control,and optical lattices induced by spatial soliton pixels of incoherent light with the light nonlinear propagation characters are also described.