Quantum device

A quantum device comprising:

• a qubit substrate having qubits and conductive pads coupled to the qubits, the qubit substrate having a first thermal expansion coefficient;
• a first support having a second thermal expansion coefficient;
• a plurality of second supports disposed between the qubit substrate and the first support, each of the second supports having a third thermal expansion coefficient;
• a plurality of coupling members, each coupling the first support and a corresponding second support of the second supports;
• and
• spring pins supported by the second supports and in contact with the conductive pads,
• wherein a control signal for controlling a state of each of the qubits is supplied to a corresponding conductive pad of the conductive pads through a corresponding spring pin of the spring pins, and
• wherein an absolute value of a difference between the first thermal expansion coefficient and the second thermal expansion coefficient is smaller than an absolute value of a difference between the first thermal expansion coefficient and the third thermal expansion coefficient.