Patent ID: 7932514

Claim:
A method for determining if a quantum system including a superconducting qubit occupies a first state |0 or a second state |1 , the method comprising: applying an input pulse to the superconducting qubit; applying a signal having a frequency through a transmission line having an output and coupled to the superconducting qubit; and measuring a resonance frequency from the superconducting qubit at the output port, wherein the resonance frequency can be one of two distinct values, a distinct first value corresponding to a first quantum well, and a second distinct value corresponding to a second quantum well, wherein if the resonant frequency is equal to the first value, then the qubit occupies the state |0 prior to applying the input pulse and the state |0 remained in the first quantum well after applying the input pulse, and if the resonant frequency is equal to the second value, then the qubit occupies the state |1 prior to applying the input pulse and the state |1 tunneled to the second quantum well subsequent to applying the input pulse.