Electron flying qubits are envisioned as potential information links within a quantum computer, but also promise—like photonic approaches—to serve as self-standing quantum processing units. In contrast to their photonic counterparts, electron-quantum-optics implementations are subject to Coulomb interactions, which provide a direct route to entangle the orbital or spin degree of freedom. However, controlled interaction of flying electrons at the single-particle level has not yet been established experimentally. Here we report antibunching of a pair of single electrons that is synchronously shuttled through a circuit of coupled quantum rails by means of a surface acoustic wave. The in-flight partitioning process exhibits a reciprocal gating effect which allows us to ascribe the observed repulsion predominantly to Coulomb interaction. Our single-shot experiment marks an important milestone on the route to realize a controlled-phase gate for in-flight quantum manipulations.
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We acknowledge fruitful discussions with V. Kashcheyevs and E. Pavlovska. J.W. acknowledges the European Union’s Horizon 2020 research and innovation programme under Marie Skłodowska-Curie grant agreement number 754303. A.R. acknowledges financial support from ANR-21-CMAQ-0003, France 2030, project QuantForm-UGA. T.K. and S.T. acknowledge financial support from JSPS KAKENHI grant number 20H02559. W.P., J.S. and H.-S.S. acknowledge support from Korea NRF via the SRC Center for Quantum Coherence in Condensed Matter (grant number 2016R1A5A1008184). C.B. acknowledges financial support from the French Agence Nationale de la Recherche (ANR), project QUABS ANR-21-CE47-0013-01. This project has received funding from the European Union’s H2020 research and innovation programme under grant agreement No 862683 ‘UltraFastNano’.
The authors declare no competing interests.
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Wang, J., Edlbauer, H., Richard, A. et al. Coulomb-mediated antibunching of an electron pair surfing on sound. Nat. Nanotechnol. 18, 721–726 (2023). https://doi.org/10.1038/s41565-023-01368-5
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