A device includes a die stack including a first die including a quantum circuit and a second die including an electronic circuit. The second die and the first die face each other. A coupler is bonded to a first surface of the first die, an optical fiber is coupled to the coupler for coupling light from the optical fiber to the quantum circuit.

The present disclosure relates to a hermetic package capable of handling a high coefficient of thermal expansion (CTE) mismatch configuration. The disclosed hermetic package includes a metal base and multiple segments that are discrete from each other. Herein, a gap exists between every two adjacent ceramic wall segments and is sealed with a connecting material. The ceramic wall segments with the connecting material form a ring wall, where the gap between every two adjacent ceramic wall segments is located at a corner of the ring wall. The metal base is either surrounded by the ring wall or underneath the ring wall.

A semiconductor apparatus includes elements formed on a substrate, a first insulation layer, a first pad and a second pad arranged on the first insulation layer and located above the elements, and a second insulation layer that is arranged on the side surfaces and upper surfaces of the first pad and the second pad. The second insulation layer includes openings at upper surfaces of the first pad and the second pad. The thickness of the first pad and the second pad is 2 m or more, the thickness of the second insulation layer is less than or equal to of the thickness of the first pad and the second pad, and the distance between the first pad and the second pad is greater than or equal to four times the thickness of the first pad and the second pad.