Entanglement and Bell's inequality violation above room temperature in metal carboxylates

TL;DR

This study demonstrates that metal carboxylates can maintain quantum entanglement and violate Bell's inequality at temperatures exceeding room temperature, indicating potential for high-temperature quantum applications.

Contribution

The paper reveals that metal carboxylates exhibit entanglement and Bell's inequality violation at temperatures above room temperature, a novel finding in quantum material research.

Findings

Entanglement persists above 630 K in the studied material.

Bell's inequality is violated up to nearly 290 K.

Maximal entanglement is maintained close to 100 K.

Abstract

In the present work we show that a special family of materials, the metal carboxylates, may have entangled states up to very high temperatures. From magnetic susceptibility measurements, we have estimated the critical temperature below which entanglement exists in the cooper carboxylate \{Cu$_2$(O$_2$CH)$_4$\}\{Cu(O$_2$CH)$_2$(2-methylpyridine)$_2$\}, and we have found this to be above room temperature ($T_e \sim 630$ K). Furthermore, the results show that the system remains maximally entangled until close to $\sim 100$ K and the Bell's inequality is violated up to nearly room temperature ($\sim 290$ K).