Quantum chip parameter determination method and device, filtering regulation method and device

A quantum chip parameter determination device, wherein the quantum chip comprises:

• a filter;
• the filter comprises a coplanar waveguide, at least one pair of parallel Josephson junctions, and an input coupling capacitor;
• wherein the coplanar waveguide is coupled to a readout line;
• the Josephson junctions are disposed on the coplanar waveguide;
• the input coupling capacitor is disposed at an input end of the coplanar waveguide;
• the device comprises:
• an adjustment range determination module that is used to determine a center frequency range and a bandwidth range of the corresponding to filtering based on a plurality of resonant cavities coupled to the readout line;
• an initial data acquisition module that is used to acquire an initial length from the input end to an output end of the coplanar waveguide, and an initial inductance set which is a set of preset equivalent inductances of the Josephson junctions;
• a judgment module that is used to determine whether there are inductance values in the initial inductance set that meet both the center frequency range and the bandwidth range based on the initial length;
• if any, trigger a result output module;
• if no, trigger an adjustment module;
• the result output module is used to output a selected inductance set;
• the adjustment module is used to adjust the initial length until there are inductance values in the initial inductance set that meet both the center frequency range and the bandwidth range;
• and
• a parameter determination module that is used to determine an area of the Josephson junctions based on the selected inductance set, and determine the length from the input end to the output end of the coplanar waveguide based on the current initial length.