How do I minimize the thermal load from microwave cables on the mixing chamber stage of a dilution refrigerator?

Minimizing the thermal load from microwave cables on the mixing chamber stage of a dilution refrigerator is critical because the mixing chamber operates at 10-20 mK with a cooling power of only 10-50 uW, and any excess heat load raises the base temperature and degrades qubit coherence. The thermal load from cables comes from: conductive heat flow (heat conducted along the cable's inner conductor, outer conductor, and dielectric from the warmer stages (4K, still, cold plate) to the mixing chamber) and radiated (photon) heat flow (microwave thermal photons propagating down the cable from warmer stages). Minimization strategies: use low-thermal-conductivity cable materials (stainless steel or NbTi (niobium-titanium) superconducting inner and outer conductors; stainless steel has approximately 100× lower thermal conductivity than copper at 4K; NbTi becomes superconducting below 10K, providing zero DC resistance with very low thermal conductivity), thermalize cables at every temperature stage (heat-sink the cables at each intermediate stage (50K, 4K, still (700mK), cold plate (100mK)) using thermal clamps or thermalization blocks; this intercepts the heat flow at each stage where the cooling power is available), use attenuators at each stage (microwave attenuators (typically 10-20 dB per stage) at each temperature stage serve dual purposes: they attenuate thermal noise photons from warmer stages, and the attenuator body is thermalized to the stage temperature, intercepting heat), and minimize the number of cables (each cable adds approximately 0.5-2 uW of heat load to the mixing chamber; for a 100-qubit system with 200-300 cables: the total cable heat load can exceed the mixing chamber cooling power unless mitigation is applied).