Adiabatic preparation of maximum entanglement in hybrid quantum systems with the Z ₂ symmetry

Abstract

A simple theoretical scheme with respect to preparing the maximum entanglement of a nitrogen‐vacancy (NV) spin and the quantized nanotubes carried with the tunable direct current is studied in this work. Basing on its inherent ℤ2 symmetry of the general Jaynes–Cummings model in this spin–phonon coupling system, two special adiabatic channels to bridge the initial discrete ground states and the final ground states with the maximum entanglement are discussed. To further supplement this scheme, we also discuss another equivalent and suitable setup, namely the NV spin and surface acoustic wave strong strain coupling scheme. Owing to adiabaticity, this scheme may be considered as an encouraged attempt for preparing the nonclassical state utilizing the systemic symmetry.

First- and second-order gradient couplings to NV centers engineered by the geometric symmetry

“…Among these solid-state spins' family, the nitrogen-vacancy (NV) center may be considered as one of the most interesting spins to accomplish this QPM target very well. Its excellent spin properties have always attracted researchers to use it to carry out the quantum sensing [26,27], quantum control and other aspects of investigations [30][31][32][33], and which correspond to the main reason that drive us to accomplish quantum manipulation or quantum sensing task using an NV-based hybrid system [34].…”

Quantum Jaynes–Cummings model for a two-level system with effects of parametric time-dependences

“…In order to describe the system, we will use the Jaynes-Cummings model together with the mathematical framework of the invariant methods and the SU(2) algebra. The Jaynes-Cummings model is a very important model, which has been used in many studies such as the quantum spin Hall effect [27], entanglement generation [28] and PT-symmetric system [29]. The detailed calculation in this context will be performed based on the time-dependent unitary transformation.…”