Electrically tunable quantum interference of atomic spins on surfaces
- URL: http://arxiv.org/abs/2506.01033v1
- Date: Sun, 01 Jun 2025 14:28:36 GMT
- Title: Electrically tunable quantum interference of atomic spins on surfaces
- Authors: Hao Wang, Jing Chen, Peng Fan, Yelko del Castillo, Alejandro Ferrón, Lili Jiang, Zilong Wu, Shijie Li, Hong-Jun Gao, Heng Fan, Joaquín Fernández-Rossier, Kai Yang,
- Abstract summary: We demonstrate electrical control of quantum interference using atomic spins on an insulating film in a scanning tunneling microscope.<n>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.<n>Results open new avenues for all-electrical quantum manipulation in spin-based quantum processors.
- Score: 43.73138793116028
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: 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-St\"uckelberg-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.
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