Study of Electromagnetically Induced Transparency using long-lived Singlet States

TL;DR

This paper investigates electromagnetically induced transparency in a two-qubit system utilizing long-lived singlet states, demonstrating their role as dark states and the use of dynamical decoupling to extend their coherence.

Contribution

It introduces a method to study EIT with long-lived singlet states and shows how simultaneous irradiation preserves these states longer through dynamical decoupling.

Findings

Singlet states act as dark states preventing probe absorption.

Simultaneous probe and control irradiation extends singlet state coherence.

Dynamical decoupling enhances the longevity of quantum states.

Abstract

The long-lived singlet states are useful to study a variety of interesting quantum phenomena. In this work we study electromagnetically induced transparency using a two-qubit system. The singlet state acts as a `dark state' which does not absorb a probe radiation in the presence of a control radiation. Further we demonstrate that the simultaneous irradiation of probe and control radiations acts as a dynamical decoupling preserving the singlet state at higher correlation for longer durations.