AI Article Synopsis
- The research highlights the construction of electron-spin qubits at an atomic level using a scanning tunneling microscope, achieving precise control and measurement of quantum states.
- To enhance the coherence of qubit interactions, a local magnetic field gradient from a single-atom magnet was utilized, allowing for remote qubit control.
- Demonstrations of fast qubit operations (single, double, and triple) were performed electrically, paving the way for advanced quantum functionalities using atomically assembled electron spin arrays.
Article Abstract
Individual electron spins in solids are promising candidates for quantum science and technology, where bottom-up assembly of a quantum device with atomically precise couplings has long been envisioned. Here, we realized atom-by-atom construction, coherent operations, and readout of coupled electron-spin qubits using a scanning tunneling microscope. To enable the coherent control of "remote" qubits that are outside of the tunnel junction, we complemented each electron spin with a local magnetic field gradient from a nearby single-atom magnet. Readout was achieved by using a sensor qubit in the tunnel junction and implementing pulsed double electron spin resonance. Fast single-, two-, and three-qubit operations were thereby demonstrated in an all-electrical fashion. Our angstrom-scale qubit platform may enable quantum functionalities using electron spin arrays built atom by atom on a surface.
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| http://dx.doi.org/10.1126/science.ade5050 | DOI Listing |
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