The Study Of The Fault-tolerant Quantum Computation And The Squeezing State Of Quantum Light-field

Quantum information is a cross-discipline of quantum physics and information.It is the study of the information processing tasks that can be accomplished using quantum mechanical systems.Because it may be the next information revolution, the field of quantum computation and quantum information has grown rapidly in recent years. But there are also some difficultes to overcome such as noise.So in order to do quantum information processing reliably in the presence of noise; the technique of quantum error-correction was developed.One of the most powerful application of quantum error-correction is the protection of quantum information as it dynamically undergoes computation. Remarkably, it turns out that arbitrarily good computation can be achieved even with faulty logic gates provided only that the error probalility per gate is bellow a certain constant threshold,this is the key of the Fault-tolerant quantum computation. At present, there are lots of physical techniques utilized to realize quantum computation. One of the most important of them is the technique of quantum optics. But in the field of quantum optics, the noise is always the great bane. So in order to combat with the noise, the technique of the squeezing of the quantum noise was developmented,this is the basic idea of the squeezing state of light field.This thesis can be divided into two parts, In the first part the application of Fault-tolerant quantum computation in quantum compiler and in quantum fourier transform were discussed. And in the second, the squeezing of the quantum noise of the Multimode quantum superposition light-field was discussed.So a series of new results were abtainted.The main content of this thesis includes:The first part :1 Give an introduction about the recent development of the quantum computation and its application.Also some concept of quantum mechanics and quantum computation was introduced.2 A frame of Fault-tolerant quantum compiler was presented.3 A frame of Fault-tolerant quantum Fourier transform was presented.The second part :1 The study of the Effects of 2(2m+1)-th Power Y-Squeezing of multimode Quantum Superposition Light-Field Composed of the Linear Superpositions of the Three Different and Macroscopically Distinguishable Multimode Coherent States.2 The study of the effects of Generalized Nonlinear Equal-Power Even-Number-Power Higher-Power Amplitude Squeezing of Generalized Electric-Field Component in 4MFSS(â… ) Light-Field.3 The study of the effects of Equal-Power N-th Power Y-Squeezing on the Quantum Noise of Effective Field-Operator of Generalized Vector Potential in a New Kind of 4MFSS (â… ) Light-Field.