Electric Field effects on quantum correlations in semiconductor quantum dots

TL;DR

This paper investigates how external electric fields influence quantum correlations in semiconductor quantum dots, revealing that quantum discord persists even when entanglement vanishes, highlighting nonclassical correlations.

Contribution

It introduces a theoretical model analyzing electric field effects on quantum discord and concurrence in coupled quantum dots, emphasizing the role of F"orster interaction and temperature.

Findings

Quantum discord remains nonzero under electric bias when concurrence vanishes.

Electric fields can sustain nonclassical correlations in quantum dots.

F"orster interaction influences the quantum correlations observed.

Abstract

We study the effect of external electric bias on the quantum correlations in the array of optically excited coupled semiconductor quantum dots. The correlations are characterized by the quantum discord and concurrence and are observed using excitonic qubits. We employ the lower bound of concurrence for thermal density matrix at different temperatures. The effect of the F\"orster interaction on correlations will be studied. Our theoretical model detects nonvanishing quantum discord when the electric field is on while concurrence dies, ensuring the existence of nonclassical correlations as measured by the quantum discord.