TITLE:
Tailoring Quantum Correlations of a Coupled Central Two Qubits Soaked in a Finite Temperature Antiferromagnetic Environment with Frequency Gap
AUTHORS:
Lukong Cornelius Fai, Ngwa Engelbert Afuoti, Georges Collince Fouokeng, Jules Casimir Ngana Kuetche, Martin Tchoffo
KEYWORDS:
Anti-Ferromagnetic Lattice, Anisotropy Field, Magnetic Field, Quantum Correlations, Central Two Qubits
JOURNAL NAME:
Journal of Quantum Information Science,
Vol.4 No.4,
December
18,
2014
ABSTRACT: We revisit the quantum features of an anti-ferromagnetic (AF) spin
environment at finite temperature with gap in its frequency spectrum, on the
dynamics quantum correlations of a coupled central two qubits system with
Dzyaloshinskii-Moriya (DM) interaction, prepared in two entangled Bell states.
Using entanglement and quantum discord as quantum meters of decoherence, the
prepared entangled states are classified as robust or fragile relative to the
degree of information leakage to the AF environment. By tailoring the size of
the frequency gap, anisotropy field strength and induced field, due to system
AF spin environment coupling, size of the AF environment and DM interaction
parameter, a decoherence-free sub-space can be accessed for efficient execution
of quantum protocols encoded in the entangled states.