Control apparatus and control method

A control apparatus comprising:

• an analog processing circuit that
• acquires a first readout signal having a first frequency band from a plurality of first qubits, and acquires a second readout signal having the first frequency band from a plurality of second qubits,
• demodulates the first frequency band to a second frequency band to generate a third readout signal, and demodulates the first frequency band to a third frequency band, which is different from the second frequency band, to generate a fourth readout signal, and
• combines the third readout signal and the fourth readout signal, to generate an analog combined signal;
• and
• an analog-to-digital converter that performs analog-to-digital conversion on the analog combined signal, to generate a digital combined signal.

A control method comprising:

• generating, by a digital processing circuit implemented in a control apparatus, a first control command group including a plurality of first control commands for controlling a plurality of first qubits, and a second control command group including a plurality of second control commands for controlling a plurality of second qubits, each of the second control commands having a same frequency as a frequency of a corresponding one of the first control commands;
• performing, by the digital processing circuit, frequency-multiplexing on a third control command group having a first frequency band obtained by adding a first offset to a frequency band of the first control command group and a fourth control command group having a second frequency band, which is obtained by adding a second offset to a frequency band of the second control command group and which is different from the first frequency band, to generate a digital multiplexed signal;
• and
• performing, by a digital-to-analog converter implemented in the control apparatus, digital-to-analog conversion on the digital multiplexed signal, to generate an analog multiplexed signal.