SKM 2023 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 3: Focus Session: Progress in Hybrid Phononic Quantum Technologies I
HL 3.2: Invited Talk
Monday, March 27, 2023, 10:00–10:30, POT 151
High-fidelity quantum information processing with spins and phonons — •Peter Rabl — Atominstitut, TU Wien, Stadionallee 2, 1020 Wien, Austria — Physik-Department, Technische Universität München, 85748 Garching, Germany — Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
Phonons in solids are usually uncontrolled and therefore represent one of the main sources of decoherence for many solid-state quantum systems. However, when appropriately designed, isolated mechanical modes offer fascinating new opportunities for engineering coherent interactions between systems that cannot be coupled efficiently otherwise. In this talk, I will discuss the prospects of this approach for engineering phonon-mediated quantum gate operations between spin qubits associated with SiV defect centers in a diamond phononic crystal. Specifically, I will show how the application of continuous spin-echo techniques can substantially boost the coherence times in this system and suppress gate errors below 10−4 for experimentally realistic noise parameters. Therefore, although the field is still in its infancy, this analysis outlines a realistic path toward moderate- and large-scale quantum devices with spins and phonons, at a level of control that is comparable to other leading quantum-technology platforms.