Coupling a single electron on superfluid helium to a superconducting resonator
Abstract
Electrons on helium form a unique two-dimensional system on the interface of liquid helium and vacuum. A small number of trapped electrons on helium exhibits strong interactions in the absence of disorder, and can be used as a qubit. Trapped electrons typically have orbital frequencies in the microwave regime and can therefore be integrated with circuit quantum electrodynamics (cQED), which studies light-matter interactions using microwave photons. Here, we experimentally realize a cQED platform with the orbitals of single electrons on helium. We deterministically trap one to four electrons in a dot integrated with a microwave resonator, allowing us to study the electrons' response to microwaves. Furthermore, we find a single-electron-photon coupling strength of g /2 π =4.8 ±0.3 MHz, greatly exceeding the resonator linewidth κ /2 π =0.5 MHz. These results pave the way towards microwave studies of Wigner molecules and coherent control of the orbital and spin state of a single electron on helium.
- Publication:
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Nature Communications
- Pub Date:
- November 2019
- DOI:
- 10.1038/s41467-019-13335-7
- arXiv:
- arXiv:1902.04190
- Bibcode:
- 2019NatCo..10.5323K
- Keywords:
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- Condensed Matter - Mesoscale and Nanoscale Physics;
- Quantum Physics
- E-Print:
- 22 pages, 15 figures including supplementary materials