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Cryogenic Thermometer Based On A Two-Level System (TLS)
Published Patent Application Number: 2022/0082449 A1
Abstract
We have invented a new type of cryogenic thermometer for use at temperature below 1 Kelvin. The device consists of a superconducting resonator with dielectric two-level systems (TLS) material deposited or naturally formed on the surface. The temperature is read out by measuring the resonance frequency of the resonator, which sensitively depends on temperature and the dependence follows a well-understood analytical curve. The thermometer is very compact and can be attached without DC wiring to other cryogenic microwave devices. It is particularly suitable for use with superconducting detectors and qubits.
patent description
We have invented a new type of cryogenic thermometer (referred to as two-level-system thermometer or TLS-thermometer) for measurement of temperature below 1 Kelvin. The device consists of a superconducting micro-resonator with dielectric materials containing two-level systems deposited or naturally formed on the surface. The temperature is read out by measuring the resonance frequency of the resonator, which depends sensitively on temperature and the dependence follows a well-understood analytical curve. This thermometer can be frequency multiplexed into existing microwave devices and readout systems without additional dedicated wiring.