Diagnostic method of a quantum apparatus and relative quantum apparatus

Diagnostic method of a quantum apparatus comprising the following steps:

• arranging a quantum computing apparatus
• characterising a characteristic operation of the quantum computing apparatus, obtaining and storing an output characteristic noise corresponding to an input white noise;
• characterising at least one diagnostic operation of the apparatus following that of the previous step, obtaining an output diagnostic noise corresponding to an input white noise;
• performing a stochastic analysis comparing the output diagnostic noise and the stored output characteristic noise, where if the deviation therebetween is greater than a predetermined value, generating at least one fault indication
• wherein the
• quantum apparatus comprises at least one quantum circuit, stochastic analysis means of the output, means for generating at least one input white noise, wherein the stochastic analysis means of the output comprise at least one piece of memory in which at least one piece of software configured to carry out the diagnostic method is stored and said outputs are obtained by means of quantum computation starting from said inputs.