Oxygen vacancies in niobium pentoxide: a key source of loss in Nb superconducting qubits
SQMS researchers uncover loss mechanisms in the surface oxide, paving the way for mitigation strategies to enhance qubit performance.
Quasiparticle Spectroscopy from Superfluid Density Measurements
Precision measurements of the London penetration depth in devices provide access to low-energy states inside the superconducting gap, which are the major fingerprints of quantum decoherence.
Deepest Sensitivity to Wavelike Dark Photon Dark Matter with SRF Cavities
Fermilab’s expertise in superconducting radiofrequency cavities leads to extremely sensitive dark matter detectors, an order of magnitude more sensitive than previous efforts.
Revealing why tantalum oxide is less lossy than niobium oxides
SQMS scientists unravel the structural difference and formation mechanism of tantalum and niobium oxides in superconducting qubits
Correlating structural imperfections and resonator performance
SQMS scientists explore how fabrication methods affect the microstructure and performance of superconducting coplanar waveguide resonators
Saving qubits from lossy oxides
Unique qubit fabrication technique enables systematic improvements in performance of superconducting devices for quantum computing, communication, and sensing
Identifying potential nanoscale sources of decoherence in Nb superconducting qubits
Insights regarding defects in the surface oxide help inform new methods for improving qubit coherence
Disentangling the sources of ionizing radiation in a typical qubit chip
Identifying the sources of radioactivity enables the development of appropriate strategies for their mitigation
Benchmarking variational quantum eigensolvers for the Kitaev model
Advancing variational quantum algorithms on NISQ devices
Probing superconducting state properties of Nb films used in superconducting qubits
Studying superconducting state properties reveals material imperfections limiting qubit coherence
On the hunt for dark matter, with entangled haloscopes
Exploring the role of entanglement for next-generation detector technology, with applications to fundamental physics