Electrically tunable quantum interference of atomic spins on surfaces
arXiv:2506.01033 · doi:10.1038/s41467-025-64022-9
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-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.
References in corpus (14)
- Nonadiabatic Landau-Zener-Stückelberg-Majorana transitions, dynamics, and interference
- Colloquium: Atomic spin chains on surfaces
- Amplitude Spectroscopy of a Solid-State Artificial Atom
- Designer quantum states of matter created atom-by-atom
- Engineering the eigenstates of coupled spin-1/2 atoms on a surface
- Analog of a quantum heat engine using a single-spin qubit
- Tuning the exchange bias on a single atom from 1 mT to 10 T
- Quantum coherent spin-electric control in a molecular nanomagnet at clock transitions
- Photon-assisted tunneling at the atomic scale: Probing resonant Andreev reflections from Yu-Shiba-Rusinov states
- Spin torque driven electron paramagnetic resonance of a single spin in a pentacene molecule
- Mirror, mirror: Landau-Zener-Stuckelberg-Majorana interferometry of a superconducting qubit in front of a mirror
- Superconducting Quantum Interference at the Atomic Scale
- Construction of topological quantum magnets from atomic spins on surfaces
- Electric Control of Spin Transitions at the Atomic Scale