Electron-on-Helium Qubits Advance as EeroQ Demonstrates Strong Microwave Photon Coupling in Nature Physics Study

EeroQ announced the first demonstration of the strong coupling of a microwave photon to the charge qubit state of an electron on helium. The peer-reviewed results were published in Nature Physics.

EeroQ stated that the demonstration establishes the electron-on-helium (eHe) approach to quantum computing as a reality.

Six major approaches to building a quantum computer are currently under development: superconducting circuits, ion traps, neutral atoms, photonics, silicon spin, and topological qubits. These are pursued by companies including IBM, Google, Microsoft, Amazon Web Services, Intel, and Honeywell, as well as numerous startups. Despite decades of research and development along with substantial investment, these approaches have encountered technical challenges and remain limited to systems with hundreds of qubits, below the millions or more estimated as necessary for commercial applications.

The demonstration establishes qubits based on electrons on helium as a viable seventh candidate. Researchers have long believed the platform could combine strong qubit quality with rapid scalability, owing to compatibility with CMOS fabrication technology used to manufacture computer chips and smartphones.

The concept of electrons floating on the surface of liquid helium as qubits was first conceived in 1999 by researchers at Bell Labs and Michigan State ...