Abstract: A quantum computing device includes: a microwave cavity (CH) having an input port (PE) and an output port (PS) that are separate or coincident; a superconducting electronic device (DS) capacitively coupled to the microwave cavity and configured to support a chain of 2N Majorana modes (MM1-MM4, MM2?, MM3?), N being a positive integer; and coupling means for applying microwave excitations between each pair of adjacent Majorana modes of the chain. It also relates to a method for producing a quantum braiding gate on a qubit by way of a quantum computing device.

Abstract: A superconducting quantum-bit device based on Josephson junction has a charge as a first principal degree of freedom assigned to writing and a phase as a second principal degree of freedom assigned to reading. The device comprises a Cooper-pair box comprising first and second Josephson junctions defining a charge island of the Cooper-pair box closing up onto a superconducting loop. A read circuit comprises a read Josephson junction JL inserted into the superconducting loop and having a Josephson energy Ej at least 50 times greater than the Josephson energy of each of the first and second Josephson junctions.

Abstract: A superconducting quantum-bit device based on Josephson junction has a charge as a first principal degree of freedom assigned to writing and a phase as a second principal degree of freedom assigned to reading. The device comprises a Cooper-pair box comprising first and second Josephson junctions defining a charge island of the Cooper-pair box closing up onto a superconducting loop. A read circuit comprises a read Josephson junction JL inserted into the superconducting loop and having a Josephson energy Ej at least 50 times greater than the Josephson energy of each of the first and second Josephson junctions.