Phys.org October 26, 2023
Electron charge qubits built on conventional semiconductors and superconductors suffer from severe charge noise that limits their coherence time to the order of one microsecond. A team of researchers in the US (Argonne National Laboratory, University of Chicago, Lawrence Berkeley National Laboratory, NSF Institute… MA, MIT, Northeastern University, Stanford University, University of Notre Dame) reported electron charge qubits exceeding the charge noise limit, based on isolated single electrons trapped on an ultraclean solid neon surface in a vacuum. Quantum information was encoded in the motional states of an electron that was strongly coupled with microwave photons in an on-chip superconducting resonator. The measured relaxation and coherence times were both on the order of 0.1 ms, surpassing all existing charge qubits. They demonstrated the simultaneous strong coupling of two qubits with a common resonator as the first step towards two-qubit entangling gates for universal quantum computing… read more. TECHNICAL ARTICLE
Design and properties of an eNe charge qubit. Credit: Nature Physics, 26 October, 2023