Abstract: A quantum computing apparatus, including a quantum circuit device; and an interposer including a connectorization layer including a plurality of terminals for connecting the quantum computing apparatus to a corresponding plurality of cables and a plurality of signal lines electrically coupled, via electrical contacts, to the plurality of terminals; and at least one intermediate layer between the quantum circuit device and the connectorization layer, the at least one intermediate layer comprising an integrated circuit layer, the at least one intermediate layer being electrically coupled to the signal lines of the interposer. The interposer is configured to supply the quantum circuit device, during operation of the quantum computing apparatus, at least control signals and readout signals to and from the plurality of cables.