Phys.org  June 16, 2023 Quantum circuits interact with the environment via several temperature-dependent degrees of freedom. Multiple experiments to-date have shown that most properties of superconducting devices appear to plateau out at T ≈ 50 mK – far above the refrigerator base temperature. This is reflected in the thermal state population of qubits and polarisation of surface spins. An international team of researchers (UK, Sweden, USA – industry) demonstrated how to remove this thermal constraint by operating a circuit immersed in liquid 3He. This allowed cooling tof he decohering environment of a superconducting resonator. They saw a continuous change in measured physical […]