Quantum computer hardware; cryomonitors; electronic cables; coaxial cables; cryogenic cables; connection cables; data cables; connections for electric cables; wires, electric; cable connectors; coaxial connectors; microwave connectors; electric couplings; cable couplings (electric -); radio-frequency components; coaxial attenuators; electrical signal attenuators; microwave filters; radio-frequency filters; apparatus and instruments for scanning probe microscopy; electrical circuits; quantum dots [crystalline semi-conductor materials].