Strong coupling of a microwave photon to an electron on helium

• URL: http://arxiv.org/abs/2509.14506v1
• Date: Thu, 18 Sep 2025 00:38:28 GMT
• Title: Strong coupling of a microwave photon to an electron on helium
• Authors: G. Koolstra, E. O. Glen, N. R. Beysengulov, H. Byeon, K. E. Castoria, M. Sammon, S. A. Lyon, D. G. Rees, J. Pollanen,
• Abstract summary: We demonstrate for the first time strong coupling between the resonator microwave field and the motional quantum state of the electron.<n>These experiments are a key step towards measurement and control of electrons on helium-based spin qubits.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Electrons bound to the surface of superfluid helium have been proposed for scalable charge and spin-based quantum computing. However single electron quantum measurement in this system has remained elusive. Here we use a hybrid circuit quantum electrodynamic (cQED) device that comprises a quantum dot and a high-impedance superconducting resonator to demonstrate, for the first time, strong coupling between the resonator microwave field and the motional quantum state of the electron. We find a coupling strength between the electron motion and a resonator photon of $g/2\pi=118$ MHz, exceeding both the electron motional state decoherence and the resonator loss. These experiments open new avenues for investigating light-matter interaction at the single electron level, and are a key step towards measurement and control of electrons on helium-based spin qubits.

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