Thermal entanglement of spins in a nonuniform magnetic field

Abstract

We study the effect of inhomogeneities in the magnetic field on the thermal entanglement of a two spin system. We show that in the ferromagnetic case a very small inhomogeneity is capable to produce large values of thermal entanglement. This shows that the absence of entanglement in the ferromagnetic Heisenberg system is highly unstable against inhomogeneoity of magnetic fields which is inevitably present in any solid state realization of qubits.

14 pages, 7 figures, latex, Accepted for publication in Physical Review A

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• Entanglement in the anisotropic Heisenberg XYZ model with different Dzyaloshinskii-Moriya interaction and inhomogeneous magnetic field
• XY model on the circle: diagonalization, spectrum, and forerunners of the quantum phase transition
• Friction due to inhomogeneous driving of coupled spins in a quantum heat engine
• XX model on the circle
• Entanglement in a Time-Dependent Coupled XY Spin Chain in an External Magnetic Field
• Thermal entanglement in a two-spin-qutrit system under a nonuniform external magnetic field
• Quantum teleportation via a two-qubit Heisenberg XXX chain with x-component of Dzyaloshinskii-Moriya interaction
• Effect of different Dzyaloshinskii-Moriya interactions on entanglement in the Heisenberg XYZ chain
• Optimal teleportation via thermal entangled states of a two-qubit Heisenberg Chain
• Entanglement between distant qubits in cyclic XX chains
• Thermal entanglement in fully connected spin systems and its RPA description
• Description of thermal entanglement with the static path plus random-phase approximation
• Quantum Energy Teleportation between Spin Particles in a Gibbs State
• Thermal entanglement of spins in mean-field clusters
• Entanglement control in one-dimensional $s=1/2$ random XY spin chain
• The Entanglement in Anisotropic Heisenberg XYZ Chain with inhomogeneous magnetic field
• Entanglement and coherence in a spin-s XXZ system under non-uniform fields
• Geometric phase of a bipartite system with Dzyaloshinski-Moriya interaction
• Maximization of thermal entanglement of arbitrarily interacting two qubits
• Quantum thermalization and thermal entanglement in the open quantum Rabi model
• System-bath entanglement of noninteracting fermionic impurities: Equilibrium, transient, and steady-state regimes
• Inducing critical phenomena in spin chains through sparse alternating fields
• Distribution of entanglement with variable range interactions
• Role of external fields in enhancing long-distance entanglement at finite temperatures
• Quantum Entanglement Control in Two-Spin-1/2 NMR Systems Through Magnetic Fields and Temperature