Experimental Investigation Of Coupled-Resonator-Induced Transparency With A Squeezed Vacuum

Quantum optics, the related experiment research of which has obtained rapid development after the invention of lasers in1960s, is an important branch of modern physics, and has won great success in various aspects of modern civilization. Moreover, the squeezed state is a hot topic in quantum optics research and has been applied in many ways, such as:quantum manipulation, gravitational wave measurement, the generation of entangled optical field, quantum teleportation and so on.This paper mainly introduces the related work during the period of study for a doctorate, including:(1) the observations of squeezed light from optical parametric amplification by using non-linear PPKTP crystal;(2) simulating the EIT-like effects by utilizing the coupled optical cavities;(3) generating the entangled state by coupling two bright squeezed light.The specific content of this thesis can be divided into four parts:(1) In the first chapter, we firstly give the five basic assumptions of quantum mechanics which is the foundation of quantum optics, and briefly recall the development history of quantum optics, and then we introduce the classification of the squeezed state in detail and compare the different ways to produce the squeezed state in experiment.(2) In the second chapter, we firstly introduce the definition of quasi phase matched, and select the PPKTP crystal as our experimental crystal by comparing many periodically poled nonlinear crystals used to produce the squeezed state. Then we produce the squeezed state by optical parametric amplification and obtain2dB squeezing by utilizing the balanced homodyne detection system, which establish a foundation for our subsequent EIT-like experiment and entangled light experiment.(3) Since the theory of the Electromagnetic induced transparency (EIT) being proposed, many experimental physicists whose research fields are limited within the category of classic have observed EIT-like effect in different systems. Our destination is to realize EIT-like effect in the category of quantum by building a kind of all-optical EIT system, and to achieve quantum manipulation in the future. In the third chapter, we firstly review the development history of EIT, EIT-like effect and theoretically studies the classical and quantum properties under different coupling strength of the system. Finally we introduces our experimental work:we use different transmissivity of cavity mirror to build the weak and strong coupling strength of the EIT-like system respectively, then we inject the squeezed state into the system and observed the EIT-like effect in the category of quantum for the first time.(4) Entanglement state is the basic resource of quantum information and quantum computation. In the fourth chapter, we firstly introduce the definition of entanglement and the classification of different ways to generate the entanglement state for continuous variables. We propose our experimental scheme and introduce the experimental setup in detail, and then use the balanced homodyne detection system to confirm that we obtain the EPR states with amplitude-quadrature and phase-quadrature correlation.Finally we give the brief summary and outlook.