Tunable thermal entanglement in an effective spin-star system using coupled microcavities

We theoretically explore the possibility of realizing controllablethermal entanglement of effective spins in a four-qubit anisotropicHeisenberg XXZ coupling spin-star system constructed by coupledmicrocavities. We analyse the dependence of thermal entanglement inthis system on temperature, inhomogeneity of the magnetic field, andanisotropy, which can be readily tuned via the external laserfields. The peculiar characteristic and the full controllability ofthe thermal entanglement are demonstrated to be useful for quantuminformation processing.