Quantum state transfer between nitrogen vacancy center ensembles in hybrid quantum system

We propose a system for quantum state transfer (QST) between two nitrogen-vacancy center ensembles (NVEs) coupled to two transmission line resonators (TLRs) via flux qubits (FQs). We study the transfer of an arbitrary quantum state by various system's controlling parameters i.e., the coupling between nitrogen vacancy ensembles g, the coupling strength between resonators. for both the resonant and non-resonant interactions in the presence of decoherence. Furthermore, we investigate the dynamics of QST for three different cases, i.e., g >> lambda, g similar or equal to and g << lambda in detail. It is found that the quantum state can be efficiently transferred between NVEs for suitable values of controlling parameters. We observe that the fidelity of quantum state transfer is about 99% in all cases for short operational time (0.45 mu s) while in the presence of decoherence fidelity is above 96%. This reveals that decoherence has no prominent effect on quantum state transfer. Copyright (C) EPLA, 2019.