Quantum coherence and quantum correlation of two qubits mediated by a one-dimensional plasmonic waveguide.

Zheng-Da Hu,Jicheng Wang,Xiuye Liang,Yixin Zhang

doi:10.1364/oe.24.010817

Abstract

We investigate the dynamics of quantum coherence and quantum correlation of two qubits mediated by a one-dimensional plasmonic waveguide. The analytical expression of the dissipative dynamics of the two qubits is obtained for the initial X state. The dynamical behaviors of the quantum coherence and quantum correlation are shown to be largely dependent on the parameters of the initial state. Starting from a product state, quantum coherence and quantum correlation can be induced by the plasmonic waveguide. Under continuous drivings, steady quantum correlation can be obtained at specific distance larger than the operating wavelength and large values of steady quantum coherence are attainable at arbitrary distance. The detuning effect on the dissipation-driven generation of steady quantum coherence and quantum correlation is also explored.

Highlights

Decoherence is usually unavoidable due to the fact that any realistic quantum system is disturbed by its surrounding which may lead to loss of quantum coherence [1]
The mediations of nonclassical correlations in dissipative environments are crucial in quantum information science [2]
Plasmons traveling along an interface are known as surface plasmon polaritons [10, 11] and display strong local surface effect, which is effective for breaking the classical diffraction limit and manipulating light in the nanoscale domain.With the development of nanotechnologies, strong and efficient coupling in plasmonic quantum electrodynamics is attainable and much work has been devoted to exploring potential applications of plasmonic nanostructures to quantum information science [12,13]

Summary

Introduction

Decoherence is usually unavoidable due to the fact that any realistic quantum system is disturbed by its surrounding which may lead to loss of quantum coherence [1]. The presence of decoherence causes obstacles for precisely carrying out quantum tasks because quantum states (to be distributed) and nonclassical correlations (used as resources) are destroyed. The mediations of nonclassical correlations (between two nodes of a quantum network) in dissipative environments are crucial in quantum information science [2].

Results

Conclusion