We propose a novel form of cryogenic primary thermometer based on flux
quantisation in a HTS superconducting ring, interrupted by a Josephso
n junction which we call the Quantum Roulette Noise Thermometer (QRNT)
. Unlike other superconductivity-based noise thermometers this device
is essentially dissipationless, requires no input or output connection
s and may be remotely interrogated. The QRNT has the potential to prov
ide high accuracy with short measuring times.