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 a long-lived 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 long 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 T centers can realize a long-lived
multi-qubit register with an optical interface in silicon photonics.

Este artículo explora los viajes en el tiempo y sus implicaciones.

Descargar PDF: