Single electrons on solid neon as a solid-state qubit platform

Xianjing Zhou, Gerwin Koolstra, Xufeng Zhang, Ge Yang, Xu Han, Brennan Dizdar, Xinhao Li, Ralu Divan, Wei Guo, Kater W. Murch (), David I. Schuster and Dafei Jin ()
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Xianjing Zhou: Center for Nanoscale Materials, Argonne National Laboratory
Gerwin Koolstra: Lawrence Berkeley National Laboratory
Xufeng Zhang: Center for Nanoscale Materials, Argonne National Laboratory
Ge Yang: The NSF AI Institute for Artificial Intelligence and Fundamental Interactions
Xu Han: Center for Nanoscale Materials, Argonne National Laboratory
Brennan Dizdar: University of Chicago
Xinhao Li: Center for Nanoscale Materials, Argonne National Laboratory
Ralu Divan: Center for Nanoscale Materials, Argonne National Laboratory
Wei Guo: National High Magnetic Field Laboratory
Kater W. Murch: Washington University in St. Louis
David I. Schuster: University of Chicago
Dafei Jin: Center for Nanoscale Materials, Argonne National Laboratory

Nature, 2022, vol. 605, issue 7908, 46-50

Abstract: Abstract Progress towards the realization of quantum computers requires persistent advances in their constituent building blocks—qubits. Novel qubit platforms that simultaneously embody long coherence, fast operation and large scalability offer compelling advantages in the construction of quantum computers and many other quantum information systems1–3. Electrons, ubiquitous elementary particles of non-zero charge, spin and mass, have commonly been perceived as paradigmatic local quantum information carriers. Despite superior controllability and configurability, their practical performance as qubits through either motional or spin states depends critically on their material environment3–5. Here we report our experimental realization of a qubit platform based on isolated single electrons trapped on an ultraclean solid neon surface in vacuum6–13. By integrating an electron trap in a circuit quantum electrodynamics architecture14–20, we achieve strong coupling between the motional states of a single electron and a single microwave photon in an on-chip superconducting resonator. Qubit gate operations and dispersive readout are implemented to measure the energy relaxation time T1 of 15 μs and phase coherence time T2 over 200 ns. These results indicate that the electron-on-solid-neon qubit already performs near the state of the art for a charge qubit21.

Date: 2022
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DOI: 10.1038/s41586-022-04539-x

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