Abstract: A method of measuring states of qubits of a quantum processor, the method includes providing, to the qubits, a control signal to control states of n qubits in the quantum processor, where n is a natural number; performing a bit-flip to invert a state of at least one qubit of the qubits; reading out output qubit values of bit-flipped qubits based on the performing of the bit-flip; and generating an error model indicating a probability of occurrence of measurement errors in the output qubit values based on a result of the reading-out of the output qubit values.