Method for preparing superconducting cables for quantum computers, including: The multi-core NbTi/Cu composite superconducting wire was obtained by using oxygen-free copper tube and NbTi rod, and the multi-core NbTi/Cu composite superconducting wire was obtained by cold drawing the multi-core NbTi/Cu rod, and then the Cu in the multi-core NbTi/Cu composite superconducting wire was removed by etching solution. A single NbTi filament at the center of multiple primary NbTi fibers was wrapped to obtain multiple strands of secondary NbTi fibers. Multiple strands of secondary NbTi wire were used to braid a single insulated NbTi wire. Obtaining superconducting cables for quantum computers. This method selects NbTi/Cu superconducting multi-core bar with appropriate core number as the raw material, and through drawing corroded core wire, teflon strip wrapping and NbTi wire braiding technology, the superconducting cable suitable for quantum computer is prepared.
Quantum computing encodes logical information in two quantum states - qubits - that transform into each other, and uses the qubit system to build a highly complex quantum central processor - quantum chip. Using quantum chips to realize programmable operation of information stored in complex quantum states - quantum logic gate and quantum algorithm, and finally realize the frontier science of quantum information processing process. However, the working environment of the quantum chip needs to be below 30mK, and the zero resistance of the superconducting wire at low temperatures does not affect the low temperature environment of the quantum chip, so it is used for signal transmission in quantum computing. The preparation technology of the wire has been monopolized by foreign countries, so it is necessary to break through the preparation technology of the superconducting cable as soon as possible.
The preparation method of superconducting cable for quantum computer is to select the NbTi/Cu superconducting multi-core bar with appropriate core number as the raw material, and successfully prepare the ultra-low temperature resistance and good microwave transmission characteristics through the drawing corrosion core wire, polytetrafluoroethylene (PTFE) tape wrapped insulation and ultra-fine NbTi wire braid technology. Superconducting cable with high thermal conductivity suitable for quantum computers.
