Entanglement preparation and non-reciprocal excitation evolution in giant atoms by controllable dissipation and coupling

TL;DR

This paper explores how giant atoms coupled to waveguides can have their dissipation and interactions controlled, enabling robust entanglement and non-reciprocal excitation dynamics for quantum information applications.

Contribution

It introduces methods to tune dissipation and induce controllable interactions in giant atoms via waveguides, advancing quantum state control techniques.

Findings

Atomic dissipation rate can be tuned by adjusting atom size.

Waveguide induces controllable individual and collective dissipation.

Realization of robust entangled states and non-reciprocal excitation evolution.

Abstract

We investigate the dynamics of giant atom(s) in a waveguide QED scenario, where the atom couples to the coupled resonator waveguide via two sites. For a single giant atom setup, we find that the atomic dissipation rate can be adjusted by tuning its size. For the two giant atoms system, the waveguide will induce the controllable individual and collective dissipation as well as effective inter-atom coupling. As a result, we can theoretically realize the robust entangled state preparation and non-reciprocal excitation evolution. We hope our study can be applied in quantum information processing based on photonic and acoustic waveguide setup.