Coherent control of multipartite excitonic entanglement in quantum dot arrays

John Erland, N. H. Bonadeo, Duncan G. Steel +3 more

Toshiyuki Miyazawa, Nakaoka Toshihiro, Katsuyuki Watanabe +3 more

Pratima Sen, Mohd. Shakil Qureshi, Pratima Sen

Xiaoguang Wang, Mang Feng, Barry C. Sanders

We investigate the generation of multipartite entangled state in a system of N quantum dots embedded in a microcavity and examine the emergence of genuine multipartite entanglement by three different characterizations of entanglement. At certain times of dynamical evolution one can generate multipartite entangled coherent exciton states or multiqubit W states by initially preparing the cavity field in a superposition of coherent states or the Fock state with one photon, respectively. Finally, we study environmental effects on multipartite entanglement generation and find that the decay rate for the entanglement is proportional to the number of excitons.

Yin Yin, Miao, Cheng Cheng +3 more

Yen‐Ju Chen, Chih‐Sung Chuu

Multipartite entanglement is indispensable in the implementation of quantum technologies and the fundamental test of quantum mechanics. Here we study how the W state and W-like state may be generated in a quantum-dot array by controlling the coupling between an incident photon and the quantum dots on a waveguide. We also discuss how the coupling may be controlled to observe the sudden death of entanglement. Our work can find potential applications in quantum information processing.