Anomalous decoherence effects in driven coupled quantum spin systems

Abstract

We discuss anomalous decoherence effects at zero and finite temperatures in driven coupled quantum spin systems. By numerical simulations of the quantum master equation, it is found that the entanglement of two coupled spin qubits exhibits a non-monotonic behaviour as a function of the noise strength. The effects of noise strength, the detuning and finite temperature of independent environments on the steady state entanglement are addressed in detail. Pumped by an external field drive, non-trivial steady states can be found, the steady state entanglement increases monotonically up to a maximum at certain optimal noise strength and decreases steadily for higher values. Furthermore, increasing the detuning can not only induce but also suppress steady state entanglement, which depends on the value of noise strength. At last, we delimit the border between presence or absence of steady state entanglement and discuss the related experimental temperatures where typical biomolecular systems exhibit long-lived coherences and quantum entanglement in photosynthetic light-harvesting complexes.

8 pages, 4 figures

References in corpus (23)

• Finite-Time Disentanglement via Spontaneous Emission
• Quantum States and Phases in Driven Open Quantum Systems with Cold Atoms
• Sudden Death of Entanglement
• Quantum Simulation of Antiferromagnetic Spin Chains in an Optical Lattice
• Non-Markovian effects on the dynamics of entanglement
• Sudden Birth Versus Sudden Death of Entanglement in Multipartite Systems
• Sudden death and sudden birth of entanglement in common structured reservoirs
• Delayed (sudden) birth of entanglement
• Experimental investigation of the dynamics of entanglement: Sudden death, complementarity, and continuous monitoring of the environment
• Scaling laws for the decay of multiqubit entanglement
• Quantum many-body theory of qubit decoherence in a finite-size spin bath
• Comparative investigation of the freezing phenomena for quantum correlations under nondissipative decoherence
• Bringing entanglement to the high temperature limit
• Local observation of antibunching in a trapped Fermi gas
• Universal dynamical decoherence control of noisy single-and multi-qubit systems
• Anomalous decoherence effect in a quantum bath
• Non-equilibrium Entanglement and Noise in Coupled Qubits
• Non-equilibrium phase transition in a periodically driven XY spin chain
• Preventing Multipartite Disentanglement by Local Modulations
• Master Equation and Control of an Open Quantum System with Leakage
• Suppression of electron spin decoherence of the diamond NV center by a transverse magnetic field
• Entanglement and its dynamics in open, dissipative systems
• Stochastic resonance phenomena in spin chains