Preservation of quantum correlation between separated nitrogen-vacancy centers embedded in photonic crystal cavities

TL;DR

This paper studies how quantum correlations between separated nitrogen-vacancy centers in photonic crystal cavities are preserved or transferred, highlighting the role of non-Markovian effects and structured reservoirs in quantum information applications.

Contribution

It demonstrates the preservation of quantum correlation in non-Markovian regimes and elucidates the conditions for correlation transfer to reservoirs, advancing understanding of quantum decoherence control.

Findings

Quantum correlation is preserved asymptotically within the band gap.

Quantum correlation is transferred to reservoirs when outside the band gap.

Non-Markovian effects and bound states are key to correlation preservation.

Abstract

We investigate the non-Markovian dynamics of quantum correlation between two initially entangled nitrogen-vacancy centers (NVC) embedded in photonic crystal cavities (PCC). We find that a finite quantum correlation is preserved even asymptotically when the transition frequency of the NVC is within the band gap of the PCC, which is quantitatively different from the result of approaching zero under the Born-Markovian approximation. In addition, once the transition frequency of NVC is far beyond the band gap of the PCC, the quantum correlation initially prepared in NVC will be fully transferred to the reservoirs in the long-time limit. Our result reveals that the interplay between the non-Markovian effect of the structured reservoirs and the existence of emitter-field bound state plays an essential role in such quantum correlation preservation. This feature may open new perspectives for devising active decoherence-immune solid-state optical devices.