Berlin 2024 – scientific programme
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QI: Fachverband Quanteninformation
QI 28: Surface Atom and Color Center Spin Qubits
QI 28.1: Invited Talk
Thursday, March 21, 2024, 15:00–15:30, HFT-FT 131
An atomic scale multi-qubit platform — •Hong Thi Bui1,2, Yu Wang1,2, Yi Chen3, Christoph Wolf1,2, Yujeong Bae1,2, Andreas J. Heinrich1,2, and Soo-hyon Phark1,2 — 1Center for Quantum Nanoscience, Institute for Basic Science (IBS), Seoul, Korea — 2Ewha Womans University, Seoul, Korea — 3International Center for Quantum Materials, Peking University, Beijing, China
Individual electron spins in solids present promising prospects as qubits in quantum science and technology. Nevertheless, scaling up their utilization has posed a longstanding challenge. The use of a scanning tunneling microscope (STM) for individual atom addressability and precise atom-by-atom positioning allows for a bottom-up design of functional quantum devices. In this work, we successfully achieved the atom-by-atom construction, coherent manipulation, and readout of coupled electron-spin qubits using an STM. To facilitate coherent control of "remote" qubits that are outside of the tunnel junction, we complemented each electron spin with a local magnetic field gradient generated by a nearby single-atom magnet [1]. The readout process was accomplished by using a sensor qubit within the tunnel junction and implementing pulsed double electron spin resonance [2]. This approach allowed for the demonstration of fast single-, two-, and three-qubit operations in an all-electrical fashion [2]. Our qubit platform at the Angstrom scale exemplifies quantum functionalities utilizing electron spin arrays assembled atom by atom on a surface.
References: [1] S. Phark et al. Adv. Sci. 10, 2302033 (2023). [3] Y. Wang et al. Science 382, 87-92 (2023).
Keywords: Scanning tunneling microscope; Electron spin resonance; Coherence control of spins qubits on surfaces; Qubit gate operations