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Analytic Approach for Controlling Realistic Quantum Chaotic Systems

Toshiya Takami, Hiroshi Fujisaki

Published Nov 21, 2012• 1 citation
OpenAlex

Abstract

Abstract. An analytic approach for controlling quantum states, which was originally applied to fully random matrix systems [T. Takami and H. Fujisaki, Phys. Rev. E 75, 036219 (2007)], is extended to deal with more realistic quantum systems with a banded random matrix (BRM). The validity of the new analytic field is confirmed by directly solving the Schrödinger equation with a BRM interaction. We find a threshold of the width of the BRM for the quantum control to be successful.

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Abstract. An analytic approach for controlling quantum states, which was originally applied to fully random matrix systems [T. Takami and H. Fujisaki, Phys. Rev. E 75, 036219 (2007)], is extended to deal with more realistic quantum systems with a banded random matrix (BRM). The validity of the new analytic field is confirmed by directly solving the Schrödinger equation with a BRM interaction. We find a threshold of the width of the BRM for the quantum control to be successful.
The rotating-wave approximation and its validity in multi-state quantum systems are studied through analytic approaches. Their applicability is also verified from the viewpoint of generic states by the use of direct numerical integrations of the Schrödinger equation. First, we introduce an extension of the rotating-wave approximation for multi-state systems. Under an assumption that a smooth transition is induced by the optimal field, we obtain three types of analytic control fields to demonstrate their validity and deficiency for generic systems represented by random matrices. Through the comparison, we conclude that the analytic field based on our coarse-grained approach outperforms the other ones for generic quantum systems with a large number of states. Finally, the further extension of the analytic field is introduced for realistic chaotic systems and its validity is shown in banded random matrix systems.
We examine random matrix systems driven by an external field in view of optimal control theory (OCT). By numerically solving OCT equations, we can show that there exists a smooth transition between two states called "moving bases" which are dynamically related to initial and final states. In our previous work [J. Phys. Soc. Jpn. 73, 3215 (2004); Adv. Chem. Phys. 130A, 435 (2005)], they were assumed to be orthogonal, but in this paper, we introduce orthogonal moving bases. We can construct a Rabi-oscillation-like representation of a wave packet using such moving bases, and derive an analytic optimal field as a solution of the OCT equations. We also numerically show that the newly obtained optimal field outperforms the previous one.
We propose a coarse-grained picture to control ``complex'' quantum dynamics, i.e., multi-level-multi-level transition with a random interaction. Assuming that optimally controlled dynamics can be described as a Rabi-like oscillation between an initial and final state, we derive an analytic optimal field as a solution to optimal control theory. For random matrix systems, we numerically confirm that the analytic optimal field steers an initial state to a target state which both contains many eigenstates.
This paper presents a novel approach to modeling and controlling quantum chaotic systems. The core idea revolves around leveraging the principles of quantum dynamics to construct accurate mathematical models of chaotic systems, followed by the application of quantum control techniques for precise manipulation and prediction. The methodology addresses a critical gap in the current research landscape, which is the nascent stage of quantum chaos studies. This work lays the groundwork for future advancements in this field, offering a systematic framework for both modeling and control. Specifically, we outline a model construction process based on the Schrödinger equation and detail control strategies utilizing quantum interference and feedback mechanisms. The presented framework has potential applications in areas such as quantum simulation, secure communication, and precision measurement.
Abstract We substantially extend our relaxation theory for perturbed many-body quantum systems from ((2020) Phys. Rev. Lett. 124 120602) by establishing an analytical prediction for the time-dependent observable expectation values which depends on only two characteristic parameters of the perturbation operator: its overall strength and its range or band width. Compared to the previous theory, a significantly larger range of perturbation strengths is covered. The results are obtained within a typicality framework by solving the pertinent random matrix problem exactly for a certain class of banded perturbations and by demonstrating the (approximative) universality of these solutions, which allows us to adopt them to considerably more general classes of perturbations. We also verify the prediction by comparison with several numerical examples.