Quantum device with multiplexed electrometer output signals

A quantum device including at least:

• several spin qubits each comprising at least one quantum dot, the qubits being arranged by forming a matrix of qubits;
• several electrometers each electrostatically coupled to a potential well of the quantum dot of one of the spin qubits;
• circuits for applying at least one AC excitation signal to at least one input electrode of each of the electrometers, configured such that a value of at least one parameter from the frequency, phase and maximum amplitude of each of the excitation signals is different from that of the other excitation signals;
• each of the circuits for applying at least one AC excitation signal being configured to apply a same excitation signal to the input electrodes of electrometers coupled to qubits arranged on a same row of the matrix of qubits
• a transimpedance amplifier comprising an input electrically coupled to output electrodes, distinct from the input electrodes, of at least two of the electrometers to which output signals are to be delivered;
• a demultiplexing circuit including an input electrically coupled to an output of the transimpedance amplifier, and configured to demultiplex the output signals to be delivered by the electrometers.