Mapping the positions of Two-Level-Systems on the surface of a superconducting transmon qubit

AI Insight

This study presents a method for spatially mapping the locations of two-level systems (TLS) on the surface of a superconducting transmon qubit. TLS are microscopic quantum defects, likely arising from amorphous materials at metal-substrate interfaces or oxide layers, that couple to the qubit and cause decoherence. By analyzing the frequency shifts and coupling strengths of individual TLS as a function of applied electric fields, the researchers were able to reconstruct their physical positions on the qubit surface with nanoscale-level inference.

Why it matters

Identifying where TLS defects are located on qubit surfaces is a critical step toward understanding and mitigating one of the primary sources of decoherence in superconducting quantum computers, which could inform improved fabrication processes and surface treatments to build more reliable qubits.