abstract
In the present work we show that a particular 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 copper carboxylate {Cu-2(O2CH)(4)}{Cu(O2CH)(2)(2-methylpyridine)(2)}, and we have found this to be above room temperature (T-e similar to 630 K). Furthermore, the results show that the system remains maximally entangled until close to similar to 100 K and the Bell's inequality is violated up to nearly room temperature (similar to 290 K).
keywords
MAGNETIC-SUSCEPTIBILITY; MOLECULAR MAGNETS; SYSTEMS; STATES; CLUSTERS; QUBITS; CU
subject category
Physics
authors
Souza, AM; Soares-Pinto, DO; Sarthour, RS; Oliveira, IS; Reis, MS; Brandao, P; dos Santos, AM
our authors
Paula Cristina Ferreira da Silva Brandão
Assistant Researcheracknowledgements
The authors acknowledge support from the Brazilian funding agencies CNPq, CAPES, and the Brazilian Millennium Institute for Quantum Information. M. S. R. acknowledges financial support from the PCI-CBPF program. This research was partially sponsored by the Laboratory Directed Research and Development Program and the Division of Materials Sciences and Engineering of Oak Ridge National Laboratory (ORNL) managed by UT-Battelle, LLC for the U. S. Department of Energy under Contract No. DE-AC0500OR22725.