Enhancement of non-equilibrium thermal quantum discord and entanglement of a three-spin XX chain by multi-spin interaction and external magnetic field
arXiv:1105.4208 · doi:10.1016/j.physleta.2011.10.004
Abstract
We investigate the non-equilibrium thermal quantum discord and entanglement of a three-spin chain whose two end spins are respectively coupled to two thermal reservoirs at different temperatures. In the three-spin chain, besides the XX-type nearest-neighbor two-spin interaction, a multi-spin interaction is also considered and a homogenous magnetic field is applied to each spin. We show that the extreme steady-state quantum discord and entanglement of the two end spins can always be created by holding both a large magnetic field and a strong multi-spin interaction. The results are explained by the thermal excitation depression due to switching a large energy gap between the ground state and the first excited state. The present investigation may provide a useful approach to control coupling between a quantum system and its environment.
16 pages, 10 figures
References in corpus (22)
- Finite-Time Disentanglement via Spontaneous Emission
- Quantum discord and the power of one qubit
- Sudden Death of Entanglement
- Experimental quantum computing without entanglement
- Quantum Open System Theory: Bipartite Aspects
- On the quantum, classical and total amount of correlations in a quantum state
- Robustness of quantum discord to sudden death
- Classical and quantum correlations under decoherence
- Quantum correlations in spin chains at finite temperatures and quantum phase transitions
- Quantum discord and quantum phase transition in spin chains
- Interpreting quantum discord through quantum state merging
- Entanglement and Quantum Phase Transition Revisited
- Quantum mutual information and the one-time pad
- Maximally discordant mixed states of two qubits
- Frozen discord in non-Markovian dephasing channels
- Magnetothermal transport in the spin-1/2 chains of copper pyrazine dinitrate
- Dynamics of nonequilibrium thermal entanglement
- Entanglement Evolution in the Presence of Decoherence
- Dissipation and entanglement dynamics for two interacting qubits coupled to independent reservoirs
- Field-dependent thermal transport in the Haldane chain compound NENP
- Dynamic properties of the spin-1/2 XY chain with three-site interactions
- Control of heat transport in quantum spin systems