Scalable Multipartite Entanglement Using Squeezed light

Abstract

Quantum entanglement is a pure quantum mechanical phenomena with no classical counterpart. The strong non locality of multipartite entangled states makes it suitable for application of quantum mechanics towards quantum computing, quantum key distribution and quantum interferometry. Many methods have been proposed for the generation of scalable multipartite entangled states in the frequency domain and by time-bin multiplexing. However, these are not suitable for long distance quantum communication. To build a long distance quantum network, we need a spatially separable multipartite entangled system. In this thesis, we focus on the use of a quantum interferometer, known as the SU(1,1) interferometer formed using a two mode squeezed quantum state, to generate a multipartite entangled quantum system in the spatial domain. We start with an introduction to the basic properties of quantum states of light and entangled systems. Later, we expand on the scheme proposed for the generation of multipartite entangled system. We go over the experimental implementation of this scheme and experimentally verify the existence of multipartite quantum correlated state.