Electrically tunable quantum interference of atomic spins on surfaces
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arXiv
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| Autori principali: | , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866912640041746432 |
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| author | Wang, Hao Chen, Jing Fan, Peng del Castillo, Yelko Ferrón, Alejandro Jiang, Lili Wu, Zilong Li, Shijie Gao, Hong-Jun Fan, Heng Fernández-Rossier, Joaquín Yang, Kai |
| author_facet | Wang, Hao Chen, Jing Fan, Peng del Castillo, Yelko Ferrón, Alejandro Jiang, Lili Wu, Zilong Li, Shijie Gao, Hong-Jun Fan, Heng Fernández-Rossier, Joaquín Yang, Kai |
| contents | Controlling quantum interference near avoided energy-level crossings is crucial for fast and reliable coherent manipulation in quantum information processing. However, achieving tunable quantum interference in atomically-precise engineered structures remains challenging. Here, we demonstrate electrical control of quantum interference using atomic spins on an insulating film in a scanning tunneling microscope. Using bias voltages applied across the tunnel junction, we modulate the atomically-confined magnetic interaction between the probe tip and surface atoms with a strong electric field, and drive the spin state rapidly through the energy-level anticrossing. This all-electrical manipulation allows us to achieve Landau-Zener-Stückelberg-Majorana (LZSM) interferometry on both single spins and pairs of interacting spins. The LZSM pattern exhibits multiphoton resonances, and its asymmetry suggests that the spin dynamics is influenced by spin-transfer torque of tunneling electrons. Multi-level LZSM spectra measured on coupled spins with tunable interactions show distinct interference patterns depending on their many-body energy landscapes. These results open new avenues for all-electrical quantum manipulation in spin-based quantum processors in the strongly driven regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_01033 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Electrically tunable quantum interference of atomic spins on surfaces Wang, Hao Chen, Jing Fan, Peng del Castillo, Yelko Ferrón, Alejandro Jiang, Lili Wu, Zilong Li, Shijie Gao, Hong-Jun Fan, Heng Fernández-Rossier, Joaquín Yang, Kai Mesoscale and Nanoscale Physics Quantum Physics Controlling quantum interference near avoided energy-level crossings is crucial for fast and reliable coherent manipulation in quantum information processing. However, achieving tunable quantum interference in atomically-precise engineered structures remains challenging. Here, we demonstrate electrical control of quantum interference using atomic spins on an insulating film in a scanning tunneling microscope. Using bias voltages applied across the tunnel junction, we modulate the atomically-confined magnetic interaction between the probe tip and surface atoms with a strong electric field, and drive the spin state rapidly through the energy-level anticrossing. This all-electrical manipulation allows us to achieve Landau-Zener-Stückelberg-Majorana (LZSM) interferometry on both single spins and pairs of interacting spins. The LZSM pattern exhibits multiphoton resonances, and its asymmetry suggests that the spin dynamics is influenced by spin-transfer torque of tunneling electrons. Multi-level LZSM spectra measured on coupled spins with tunable interactions show distinct interference patterns depending on their many-body energy landscapes. These results open new avenues for all-electrical quantum manipulation in spin-based quantum processors in the strongly driven regime. |
| title | Electrically tunable quantum interference of atomic spins on surfaces |
| topic | Mesoscale and Nanoscale Physics Quantum Physics |
| url | https://arxiv.org/abs/2506.01033 |