Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 43: Color Centers III
Q 43.8: Talk
Thursday, March 14, 2024, 12:45–13:00, Aula
Spin-phonon entanglement in SiC optomechanical quantum oscillators — •Ruoming Peng1, Xuntao Wu2, Durga Dasari1, and Joerg Wrachtrup1 — 13. Physikalisches Institut, University of Stuttgart, 70569 Stuttgart, Germany — 2Pritzker School of Molecular Engineering, University of Chicago, Chicago IL 60637, USA
Scaling up quantum systems, especially solid-state spins, presents a significant challenge in the field of quantum information science. In this study, we propose a hybrid spin-phonon architecture based on spin-embedded optomechanical crystal (OMC) cavities. This architecture combines integrated photonic and phononic accesses, allowing for the entanglement of multiple spins. Remarkably, this hybrid spin-optomechanical system can offer a coupling of the spin to the vibration mode of simulated Silicon Carbide OMC cavities approaching MHz in a Raman-facilitated mechanism, enabling a fast and efficient spin-phonon entanglement with fidelity of 98%. By incorporating the Stimulated Raman Adiabatic Passage (STIRAP) protocol into the coupled tripod-phonon system, a two-qubit Controlled-Z gate with 97% fidelity is implemented by engineering the non-vanishing geometry phase in a strongly coupled spin-phonon dark state basis, which is robust against the dominant loss from the excited state and allow for full connection of spins through the cavity phonon. Our work establishes a crucial platform for exploring the spin entanglement with potential scalability in addition to the optical link, which opens the path to investigate quantum acoustics in hybrid solid-state systems
Keywords: optomechanics; spin; phonon; Stimulated Raman adiabatic passage; hybrid quantum system