Abstract: A quantum device includes a plurality of qubits, electrometers coupled to qubits of the plurality of qubits, a voltage generation module generating a plurality of voltages for exciting the electrometers at frequencies, phases or amplitudes specific to each electrometer, and a transmission line for an aggregated signal originating from the electrometers, with the signal being processed, after being picked up by an amplifier, by a demodulation module in order to provide demodulated signals. The plurality of qubits comprises qubits organized as a surface code for correcting quantum errors comprising data qubits for preserving quantum data and auxiliary qubits coupled to the electrometers, with modulations introduced by the voltage generation module into the voltages of the plurality of voltages being dynamically adapted by a modulation assignment module adapted to the code and as a function of the demodulated signal so as to adjust a readout fidelity of the quantum device.

Abstract: A quantum device comprising a plurality of qubits, a demultiplexing circuit, a common transmission line for transmitting qubit read signals to the demultiplexing circuit, and, for each qubit of the plurality, one quantum electrometer coupled to the qubit with a view to transmitting, over the common transmission line, a signal depending on a current state of the qubit and on a periodic excitation applied to the quantum electrometer. The quantum device is noteworthy in that, the periodic excitations transmitted to a group of qubits of the device being transmitted with an identical frequency, the device comprises phase-shifting means that introduce distinct phase shifts and optionally amplitude-attenuating means that introduce amplitude differences into the excitations respectively applied to the various quantum electrometers.

Abstract: A quantum device comprising a plurality of qubits, a demultiplexing circuit, a common transmission line for transmitting qubit read signals to the demultiplexing circuit, and, for each qubit of the plurality, one quantum electrometer coupled to the qubit with a view to transmitting, over the common transmission line, a signal depending on a current state of the qubit and on a periodic excitation applied to the quantum electrometer. The quantum device is noteworthy in that, the periodic excitations transmitted to a group of qubits of the device being transmitted with an identical frequency, the device comprises phase-shifting means that introduce distinct phase shifts and optionally amplitude-attenuating means that introduce amplitude differences into the excitations respectively applied to the various quantum electrometers.