 Quantum circuits are susceptible to environmental decoherence, which limits their performance. In order to overcome this limitation, researchers have developed techniques to cool the environment surrounding the circuits, allowing them to operate at lower temperatures. However, these techniques require the use of cryogenic liquids such as helium, which can be expensive and difficult to handle. A new technique has been developed using liquid 3He, which can act as a heat sink to increase the energy relaxation rate of the quantum bath couple to the circuit, while still maintaining low circuit losses and noise. This technique can significantly reduce decoherence in quantum circuits, making it possible to operate at much lower temperatures than before. This article was authored by M. Lucas, A. V. Danilov, L. V. Levitan, and others.