Phase-tuned entangled state generation between distant spin qubits

Entanglement is the central resource in quantum information processing, sensing and communication. Distribution of entanglement through non-local interactions, using photon interference and detection, is an attractive feature of flexible computation architectures where spatially separate nodes are locally controlled and connected via photonic channels. I will present recent work from the Atat\"{u}re group in Cambridge on the generation of entangled states between two electron spins confined in optically active indium-gallium-arsenide (InGaAs) quantum dots situated metres apart. The combination of a minimal single-photon state-projection scheme and the strong coherent light-matter interaction in these systems enables a distant entanglement rate of 7.3 kHz, the highest reported to date. With full control over the single-photon interference, we demonstrate the creation of entangled states with arbitrary phase.