Dirac quantum time mirror

TL;DR

This paper introduces a novel quantum time mirror using Dirac spectrum oscillations to generate high-fidelity wave function echoes, enabling controlled time discontinuities in quantum systems like graphene.

Contribution

It proposes the first instantaneous quantum time mirror leveraging Dirac particle-hole oscillations for population reversal.

Findings

Demonstrates high-fidelity wave function echoes in quantum systems.

Applicable to graphene and similar Dirac materials.

Provides a new method for quantum time inversion protocols.

Abstract

Both metaphysical and practical considerations related to time inversion have intrigued scientists for generations. Physicists have strived to devise and implement time-inversion protocols, in particular different forms of "time mirrors" for classical waves. Here we propose an instantaneous time mirror for quantum systems, i.e., a controlled time discontinuity generating wave function echoes with high fidelities. This concept exploits coherent particle-hole oscillations in a Dirac spectrum in order to achieve population reversal, and can be implemented in systems such as (real or artificial) graphene.