Virtual Parity-Time Symmetry

TL;DR

This paper introduces a passive, gain-free method to realize parity-time symmetry in optics using non-monochromatic excitations, enabling PT-symmetric effects without the need for active gain or loss components.

Contribution

It proposes a novel gain-free approach to PT-symmetry using virtual absorption and gain, expanding PT-symmetric phenomena to passive, stable systems.

Findings

Demonstrated PT-symmetry effects in passive systems

Achieved broken phase transitions and anisotropic resonances

Realized laser-absorber pairs without active gain

Abstract

Parity-time (PT) symmetry has been opening exciting opportunities in optics, yet the required careful balance of loss and gain has been hindering its practical implementations. Here, we propose a gain-free route to PT-symmetry based on non-monochromatic excitations that mimic loss and gain in passive systems. Based on the concept of virtual absorption, extended here to implement also virtual gain, we induce PT-symmetry and its landmark effects, such as broken phase transitions, anisotropic transmission resonances and laser-absorber pairs, in a fully passive, hence inherently stable, system. These results open a path to establish PT-symmetric phenomena in purely passive platforms.