The quantum roulette noise thermometer

A novel form of primary thermometer called the quantum roulette noise therm ometer (QRNT), based on Bur quantization in a high temperature superconduct ing (HTS) ring, interrupted by a Josephson junction, has been proposed. The basis of the QRNT is that the Bur state of the ring is allowed to evolve f reely, and is repeatedly interrogated to establish a probability distributi on from which the temperature of the device is derived. Unlike other superc onductivity-based noise thermometers, this device is essentially dissipatio nless, requires no input or output connections, and may be remotely interro gated, The QRNT has the potential to pro,ide high accuracy with short measu ring times. Prototype QRNT devices based on thin HTS films have been fabric ated and results of initial experimental measurements are presented. Parame ters of the experimental devices are compared with predictions of the theor etical model.