Topological dynamics of adiabatic cat states

TL;DR

This paper explores the topological dynamics of a quantum system involving a qubit coupled to harmonic modes, revealing superpositions called adiabatic cat states and their entanglement properties driven by topological effects.

Contribution

It introduces the concept of adiabatic cat states in a quantum topological frequency converter and analyzes how topological coupling enhances entanglement and relates to the quantum metric.

Findings

Superpositions of adiabatic states evolve into adiabatic cat states.

Topological coupling induces quantized energy transfer in opposite directions.

Entanglement between qubit and modes is enhanced by topological effects.

Abstract

We consider a quantum topological frequency converter, realized by coupling a qubit to two slow harmonic modes. The dynamics of such a system is the quantum analog of topological pumping. Our quantum mechanical description shows that an initial state generically evolves into a superposition of two adiabatic states. The topological nature of the coupling between the qubit and the modes splits these two components apart in energy: for each component, an energy transfer at a quantized rate occurs between the two quantum modes, in opposite directions for the two components, reminiscent of the topological pumping. We denote such a superposition of two quantum adiabatic states distinguishable through measures of the modes' energy an adiabatic cat state. We show that the topological coupling enhances the entanglement between the qubit and the modes, and we unveil the role of the quantum or Fubini-Study metric in the characterization of this entanglement.