Excitation- and state-transfer through spin chains in the presence of spatially correlated noise

Abstract

We investigate the influence of environmental noise on spin networks and spin chains. In addition to the common model of an independent bath for each spin in the system we also consider noise with a finite spatial correlation length. We present the emergence of new dynamics and decoherence-free subspaces with increasing correlation length for both dephasing and dissipating environments. This leads to relaxation blocking of one spin by uncoupled surrounding spins. We then consider perfect state transfer through a spin chain in the presence of decoherence and discuss the dependence of the transfer quality on spatial noise correlation length. We identify qualitatively different features for dephasing and dissipative environments in spin-transfer problems.

8 pages + references

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• Spin coherence in strongly coupled spin baths in quasi-two-dimensional layers
• Response to defects in multi- and bipartite entanglement of isotropic quantum spin networks
• Charging a Dimerized Quantum XY Chain
• Optimized control for high-fidelity state transmission in open systems
• The effects of thermal and correlated noise on magnons in a quantum ferromagnet
• Optimally controlled non-adiabatic quantum state transmission in the presence of quantum noise
• Revealing correlated noise with single-qubit operations
• Exciton transport in amorphous polymers and the role of morphology and thermalisation
• Control cost and quantum speed limit time in controlled almost exact state transmission in open systems