Description: Fabrication and cryogenic characterisation of superconductor-insulator-superconductor tunnel junction mixers for quantum-limited heterodyne detection at mm/sub-mm/THz wavelengths.
Jian-Rong Gao develops superconducting THz heterodyne detector arrays for radio astronomy and fundamental physics applications. Key work: (1) hot electron bolometer (HEB) and SIS mixer THz receivers operating at sub-mm and THz frequencies; (2) detector arrays for space and ground-based radio telescopes (Herschel, ALMA, and future missions); (3) low-noise amplification at THz frequencies. Joint professor TU Delft and SRON (Netherlands Institute for Space Research).
Tan leads the Superconducting Quantum Detectors group, holding ERC Starting and Consolidator Grants. Two main research pillars: (1) Quantum-limited SIS mixer development — pushing THz SIS heterodyne receivers above the Nb gap (~700 GHz) using NbTiN/NbN films for next-generation ALMA wideband sensitivity upgrade (Band 9) and large-format focal-plane mixer arrays for JCMT/SMA; (2) Superconducting parametric amplifiers (TWPAs) — fabricating kinetic-inductance and Josephson-junction TWPAs achieving near-quantum-limited broadband noise performance from microwave to THz, with applications to dark matter/axion searches (ABRACADABRA/prototype cavity haloscope), quantum computing qubit readout, and CMB-grade receivers. Group is transitioning TWPA fabrication in-house using Beecroft Building cleanroom. ERC Consolidator Grant awarded 2024.
Observational cosmologist and instrumentalist studying dusty star-forming galaxies and cosmology using ALMA, Hubble, Chandra, JWST, and South Pole Telescope data, and developing millimeter/submillimeter receiver instrumentation.