The quantum sensor can be used to measure and manipulate the second-order defects in the qubit. In quantum computing, information is encoded in qubits. Qubits (or qubits) are quantum mechanical simulations of classical bits and are coherent two-stage systems. One of the leading forms of qubits today is the superconducting qubit based on Josephson junctions. IBM and Google use this kind of qubit in their quantum processors. However, scientists are still searching for the perfect qubit that can be accurately measured and controlled without being affected by its environment. The key element of superconducting qubits is the nano-scale superconductor-insulator-superconductor Josephson junction. Josephson junction is a tunnel junction made of two superconducting metals separated by a very thin insulating layer. The most common insulator is alumina. Modern technology does not allow qubits to be constructed with 100% accuracy, leading to a so-called tunneling two-stage defect, which limits the performance of superconducting quantum devices and leads to calculation errors. These defects result in a very short lifetime or decoherence of the qubits. The tunneling defects on the surface of alumina and superconductors are important sources of fluctuations and energy dissipation in the superconducting qubits, which ultimately limit the running time of computers. The researchers note that the more material defects occur, the greater their impact on the elbow's performance, leading to more miscalculations. The new quantum sensor allows the measurement and operation of each secondary defect in the quantum system. Professor Alexey Ustinov, head of the Superconducting Metamaterials Laboratory at NUST MISIS and head of the research group at the Russian Quantum Center, said that the sensor itself is a superconducting qubit that can detect and process individual defect.