Prolonging the Qubits Entanglement via Local Surface Plasmon Modes

A key to achieving quantum computing is the qubit-entanglement. Nevertheless, real-life qubits cannot be isolated from the environment completely. As a result, the entanglement between qubits decoheres via their interaction with the environment. Therefore, it is essential to understand how the qubit-entanglement changes over time. In this work, we study the entanglement between qubits when placed in a bulk of dielectric material embedded with a nanosized metal particle. Most importantly, we focus on the effects of the unavoidable localized surface plasmons induced at the surface of the metal particle. We discuss how the distance between the metal particles affects the entanglement of the qubits and how various entangled states are affected by the localized surface plasmons.