Study on Generation and Transfer of Non-classical States for Application in Quantum Communication

Abstract

This thesis is devoted to the study of optical waveguide arrays for their applications in quantum information processing tasks. Using integrated waveguide structures, generation and non-locality study of multiqubit entangled states have been presented. Further using specially engineered waveguide structures, perfect transfer of important non-classical states have been studied. In addition, the non-locality of entangled states was first studied using Mermin’s and Svetlichny’s inequalities and then was verified on IBMQ quantum computing device. Integrated optical waveguide structures are stable, scalable, precisely fabricated and offers low photon propagation losses and hence have gained interest for their applications in diverse areas of science. In this thesis focus has been made on utilization of optical waveguide arrays for the use in quantum information processing tasks. In the first part of this work using single photon propagation through weakly coupled waveguide structures an approach have been made to generate important entangled states. These entangled states are useful for quantum information processing tasks such as perfect quantum teleportation and superdense coding. Next the non-locality of entangled states has been studied using Mermin’s and Svetlichny’s inequality and later was verified on IBM’s quantum computing platform, IBMQ. In the next part of the work using integrated waveguide structure with parabolic coupling maintained between individual waveguides, perfect state transfer of important non-classical light has been explored. In the last part of the work both ID and 2D integrated waveguide structures were utilized for the generation and entanglement study of multiqubit entangled states suitable for perfect teleportation and superdense coding. The findings of the work are important for the utilization of photonic system in quantum information processing tasks. The results are significant in the study of important entangled states.