Implicit Lyapunov‐based control strategy for closed quantum systems with dipole and polarizability coupling

Abstract

Summary In this paper, the state transfer of finite dimensional closed quantum systems with dipole and polarizability coupling in non‐ideal cases is investigated. Two kinds of non‐ideal systems are considered, where the internal Hamiltonian of the system is not strongly regular and not all the eigenvectors of the internal Hamiltonian are directly coupled with the target state. Such systems often exist in practical quantum systems such as the one‐dimensional oscillator and coupled two‐spin system. An implicit Lyapunov‐based control strategy is proposed here with convergence analysis for quantum systems modeled by finite dimensional bilinear Schrödinger equations. Specifically, two kinds of Lyapunov functions are defined via implicit functions, and their existences are guaranteed with the help of a fixed point theorem. Then, the local convergence analysis is investigated with the explicit characterization of the largest invariant set by LaSalle invariance principle. Finally, the performance of the feedback design is illustrated by numerical simulations. Copyright © 2017 John Wiley & Sons, Ltd.

Exponential stabilization of spin-1/2 systems based on switching state feedback

“…The results of 10 experiments under (4) and (5) are shown in Fig. 3, from which one can see that both of (4) and (5) can achieve the exponential stabilization of ρ e , and the state convergence is faster under continuous state feedback control (5) in most of the time domain [0, 8] and [16,20], while the state convergence is faster under continuous state feedback control (4) in most of the time domain [8,16].…”

“…For the high-accuracy and rapidity of preparing target eigenstate, many classical control methods, e.g. optimal control [1,2], sliding mode control [3,4], H ∞ control [5], and Lyapunov control [6][7][8], have be applied in quantum systems since the early 1980s.…”