Quantum Interface to Interconvert a Quantum State between SPP and Light

Abstract

Quantum-state engineering to interconvert a quantum state between a flying qubit and a stationary qubit is crucial for hybrid quantum systems in quantum information processing. For the purpose we propose one quantum interface to interconvert a quantum state between light and surface plasmon polariton(SPP) and another between SPP and stationary qubit. Applying consecutively two quantum interfaces is equivalent to an indirect quantum interface between a flying and a stationary qubits, mediated by the surface plasmon polariton. We discuss the efficiency and the fidelity of such an indirect quantum interface. In addition, we show that quantum interface proposed here can approximately be modeled by consecutive beam splitters, an analogy to light fields.