Abstract
Abstract We propose a novel form of cryogenic primary thermometer based on flux quantization in a HTS superconducting ring, interrupted by a Josephson junction which we call the quantum roulette noise thermometer (QRNT). The basis of the QRNT is that the flux state of a double junction SQUID ring (in thermal contact with a heat bath whose temperature is to be measured) is allowed to evolve freely. At regular intervals the (quantized) internal flux state of the ring is interrogated, allowing a probability distribution of flux states to be built up, from which the absolute temperature may be directly derived. Unlike other superconductivity-based noise thermometers this device is essentially dissipationless, requires no input or output connections and may be remotely interrogated. The QRNT has the potential to provide high accuracy with short measuring times. The novel principles behind the device are described and preliminary experimental data will be presented.
Published Version
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