Guofeng Zhang

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The purpose of this paper is to study the realization theory of quantum linear systems. It is shown that for a general quantum linear system its controllability and observability are equivalent and they can be checked by means of a simple matrix rank condition. Based on controllability and observability a specific realization is proposed for general quantum(More)
The purpose of this paper is to study and design direct and indirect couplings for use in coherent feedback control of a class of linear quantum stochastic systems. A general physical model for a nominal linear quantum system coupled directly and indirectly to external systems is presented. Fundamental properties of stability, dissipation, passivity, and(More)
The purpose of this paper is to extend linear systems and signals theory to include single photon quantum signals. We provide detailed results describing how quantum linear systems respond to multichannel single photon quantum signals. In particular, we characterize the class of states (which we call photon-Gaussian states) that result when multichannel(More)
The purpose of this paper is to formulate and solve a synthesis problem for a class of linear quantum equations that may describe mixed quantum-classical systems. We propose a standard model for mixed quantum-classical linear stochastic systems for the design process, which can present the internal structure of a mixed quantum-classical system. Physical(More)
The purpose of this paper is to show how a class of classical linear stochastic systems can be physically implemented using quantum optical components. Quantum optical systems typically have much higher bandwidth than electronic devices, meaning faster response and processing times, and hence has the potential for providing better performance than classical(More)
A new controller discretization approach, the generalized bilinear transformation (GBT), is proposed in [1]. Given an analog controller K, GBT generates a class of digital controllers Kgbt parameterized by α ∈ (−∞,∞). A geometric interpretation of GBT is first presented. Secondly, when the original analog feedback system is stable, a method is proposed to(More)
Digital redesign via the generalised bilinear transformation G. Zhang a , X. Chen b & T. Chen c a School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan, China b Department of Electrical and Computer Engineering, University of Windsor, Windsor, ON, Canada c Department of Electrical and Computer(More)