Paper
Entanglement of a nuclear spin qubit register in silicon photonics
Authors
Hanbin Song, Xueyue Zhang, Lukasz Komza, Niccolo Fiaschi, Yihuang Xiong, Yiyang Zhi, Scott Dhuey, Adam Schwartzberg, Thomas Schenkel, Geoffroy Hautier, Zi-Huai Zhang, Alp Sipahigil
Abstract
Color centers provide an optical interface to quantum registers based on electron and nuclear spin qubits in solids. The T center in silicon is an emerging spin-photon interface that combines telecom O-band optical transitions and an electron spin in a scalable photonics platform. In this work, we demonstrate the initialization, coherent control, and state readout of a three-qubit register based on the electron spin of a T center coupled to a hydrogen and a silicon nuclear spin. The spin register exhibits spin echo coherence times of ~ms for the electron spin, ~ms for the hydrogen nuclear spin, and ~ms for the silicon nuclear spin. We use nuclear-nuclear two-qubit gates to generate entanglement between the two nuclear spins with a fidelity of and a coherence time of ~ms. Our results show that a T center in silicon photonics can realize a multi-qubit register with an optical interface for quantum communication.