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We study operation of a new device, the superconducting differential doublecontour interferometer (DDCI), in application for the ultra sensitive detectionof magnetic flux and for digital read out of the state of the superconductingflux qubit. DDCI consists of two superconducting contours weakly coupled byJosephson Junctions. In such a device a change of the critical current and thevoltage happens in a step-like manner when the angular momentum quantum numberchanges in one of the two contours. The DDCI may outperform traditionalSuperconducting Quantum Interference Devices when the change of the quantumnumber occurs in a narrow magnetic field region near the half of the fluxquantum due to thermal fluctuations, quantum fluctuations, or the switching aloop segment in the normal state for a while by short pulse of an externalcurrent.

A development of superconducting differential double contour interferometer