Southwest Quantum Information and Technology

Towards microwave assisted spin-spin entanglement

Presenting Author: Jason Petta, Princeton University
Contributing Author(s): Xiao Mi, Felix Borjans, Xanthe Croot, Felix Schupp, Monica Benito, Stefan Putz, David Zajac, Jacob Taylor, and Guido Burkard

Electron spins are excellent candidates for solid state quantum computing due to their exceptionally long quantum coherence times, which is a result of weak coupling to environmental degrees of freedom. However, this isolation comes with a cost, as it is difficult to coherently couple two spins in the solid state, especially when they are separated by a large distance. Here we combine a large electric-dipole interaction with spin-orbit coupling to achieve spin-photon coupling. Vacuum Rabi splitting is observed in the cavity transmission as the Zeeman splitting of a single spin is tuned into resonance with the cavity photon. We achieve a spin-photon coupling rate as large as \(g _s/2 {\pi}\) = 10 MHz, which exceeds both the cavity decay rate \({\kappa}/2{\pi}\) = 1.8 MHz and spin dephasing rate \({\gamma}/2{\pi}\) = 2.4 MHz, firmly anchoring our system in the strong-coupling regime. Moreover, the spin-photon coupling mechanism can be turned off by localizing the spin in one side of the double quantum dot. Recent progress towards microwave assisted spin-spin entanglement will be presented.

(Session 12 : Tuesday from 1:30pm - 2:15pm)