Quantum chaotic system as a model of decohering environment
Jayendra N Bandyopadhyay
Centre for Quantum Technologies, National University of Singapore.
Decoherence, which is caused due to the interaction of a quantum system with its environment, leads to the loss of quantumness of the system. This phenomenon is believed to be responsible for the quantum-classical transition, and it is also a great obstacle for the realization of quantum computer. In decoherence studies, the environment is generally modeled by many-body systems, e.g., many harmonic oscillators in thermal equilibrium (Feynman-Vernon/Caldeira-Leggett model), spin-boson model, etc. In this work, we study single particle quantum chaotic system as a model of decohering environment. We explore how this simple deterministic model can reproduce the decohering effects of many-body environment. Our results show that, like the many-body environment, the quantum chaotic system is an efficient decoherer, and it can generate entanglement between two qubits which have no direct interaction.