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O: Fachverband Oberflächenphysik
O 90: Spins on Surfaces at the Atomic Scale II
O 90.3: Vortrag
Donnerstag, 20. März 2025, 15:30–15:45, H11
Coherent control of a single Er electron spin on surface — Dasom Choi1,2, Yaowu Liu1,3,4, Stefano Reale1,3, Jeongmin Oh1,2, We-hyo Seo1,3, Andreas Heinrich1,2, Soo-hyun Phark1,3, and •Fabio Donati1,2 — 1Center for Quantum Nanoscience, Institute for Basic Science, Korea — 2Physics Department, Ewha Womans University, Korea — 3Ewha Womans University, Seoul, Korea — 4Department of Energy, Politecnico di Milano, Milano, Italy
Electron spins on surface provide an atomic scale qubit platform for quantum information science using scanning tunneling microscopy (STM) [Phark et al. ACS Nano 17, 14144 (2023), Wang et al. Science 382, 87 (2023)]. A bottleneck of this new platform lies in the decoherence stemming from the strong interaction with the environments. Lanthanide atoms, with their highly localized 4f electrons, offer a potential solution to this issue and make them as strong candidates of single atomic spin qubits on surfaces with a high quality factor Q = 2Ω T2 (Ω = Rabi rate, T2 = coherence time). In this talk, we present a recent advance in the qubit quality factor, achieved using erbium (Er) atoms on a MgO surface [Reale et al. Phys. Rev. B 107, 045427 (2023)]. We performed a coherent control of the Er atoms using pulsed electron spin resonance (ESR), sensed by a nearby Ti spin [Reale et al. Nat. Commun. 15, 5289 (2024)]. Notably, a single Er spin showed a fivefold improvement in the qubit quality factor compared to the prototypical Ti spin on the same substrate [Yang et al. Science 366, 509-512 (2019)]. This result represents a step towards implementing quantum processes into atomic spin qubits on surfaces.
Keywords: Rare earth atoms; Scanning tunneling microscopy; Electron spin resonance; Quantum coherent control