2025/04/21 by Song, Hanbin, Zhang, Xueyue, Komza, Lukasz +9 · 4 citations
#FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Optics (physics.optics) #Quantum Physics (quant-ph)
paper · doi:10.48550/arxiv.2504.15467
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 0.41(2)~ms for the electron spin, 112(12)~ms for the hydrogen nuclear spin, and 67(7)~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 F=0.77(3) and a coherence time of T^*2=2.60(8)~ms. Our results show that a T center in silicon photonics can realize a multi-qubit register with an optical interface for quantum communication.