Efficient Entanglement Distillation of Solid Qubits Using Non-Reciprocal Microresonators

Abstract

Recently, long distance of quantum communication relies on efficient quantum repeaters, and the distribution of maximal entanglement is a key technique for it. Especially, the distribution of entanglement with high-fidelity relies on the entanglement purification and concentration. Here we present a system to realize the entanglement purification for λ-type three-level entangled quantum dots by using the whispering-gallery-mode microcavity. Also we design a parity check gate on solid qubits that allows the quantum nondemolition measurement on the remote qubits. Moreover, one can distill a high-fidelity entangled solid state ensemble from a mixed-entangled state ensemble nonlocally.