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Astronomical Kinetic Inductance Detectors (KIDs), similar to quantuminformation devices, experience performance limiting noise from materials. Inparticular, 1/f (frequency) noise can be a dominant noise mechanism, whicharises from Two-Level System defects (TLSs) in the circuit dielectrics andmaterial interfaces. Here we present a Dual-Resonator KID (DuRKID), which isdesigned for improved signal to noise (or noise equivalent power) relative to1/f-noise limited KIDs. We first show the DuRKID schematic, fabricated circuit,and we follow with a description of the intended operation, first measurements,theory, and discussion. The circuit consists of two superconducting resonatorssharing an electrical capacitance bridge of 4 capacitors, each of which hostsTLSs. The device is intended to operate using hybridization of the modes, whichcauses TLSs to either couple to one mode or the other, depending upon whichcapacitor they reside in. In contrast, the intended KID signal is directed toan inductor, and due to hybridization this causes correlated frequency changesin both (hybridized) modes. Therefore, one can distinguish photon signal fromTLS frequency noise. To achieve hybridization, a TiN inductor is current biasedto allow tuning of one bare resonator mode into degeneracy with the other andmeasurements show that the intended resonator modes frequency tune andhybridize as expected. The interresonator coupling and unintentional couplingof the 2 resonators to transmission lines are also characterized inmeasurements. In the theory, based on a quantum-information-science modes, wecalculate the 4-port S parameters and simulate the 1/f frequency noise of thedevice. The study reveals that the DuRKID can exhibit a large and fundamentalperformance advantage over 1/f-noise-limited KID detectors.

Dual-Resonator Kinetic-Inductance Detector for Distinction between Signal and 1/f Frequency Noise