Entanglement Between a Single Quantum Dot Spin and a Single Photon

Abstract

While fast, complete SU(2) control of a long-lived qubit is an essential ingredient of any quantum information system, our focus on quantum communication systems, and quantum repeaters in particular, requires a means of interfacing the stationary, matter and memory qubits, with flying, photonic qubits. As we derived in Sects. 1.1.3.1 and 1.4, entanglement between a spin-qubit and a photonic qubit [1–5] provides exactly the type of interface required in order to generate remotely-entangled spin-pairs and implement the quantum teleportation and entanglement swapping schemes that are at the heart of quantum repeaters [6–11].