Josephson junction, Josephson junction preparation method and apparatus, and superconducting circuit

A method for Josephson junction preparation, comprising:

• acquiring a substrate structure;
• and
• forming a first electrode layer on the substrate structure, forming an insulating layer on the first electrode layer, and forming a second electrode layer on the insulating layer, wherein the first electrode layer and the second electrode layer are composed of a preset material, the insulating layer is composed of a compound corresponding to the preset material, and the preset material comprises a non-aluminum superconducting material to prolong a coherence time of superconducting qubits, and wherein:
• an arrangement of the insulating layer between the first electrode layer and the second electrode layer forms a Josephson junction, and
• forming the second electrode layer on the insulating layer comprises forming a continuous bridge structure comprising:
• a first end on the insulating layer,
• a second end on the substrate structure, and
• a middle sub-electrode between the first and send ends, the middle sub-electrode being disposed over and forming an air gap from the substrate structure.

A superconducting circuit, comprising:

• a Josephson junction used as a nonlinear inductance element, wherein the Josephson junction is generated by a method, the method comprising:
• acquiring a substrate structure;
• and
• forming a first electrode layer on the substrate structure, forming an insulating layer on the first electrode layer, and forming a second electrode layer on the insulating layer, wherein the first electrode layer and the second electrode layer are composed of a preset material, the insulating layer is composed of a compound corresponding to the preset material, and the preset material comprises a non-aluminum superconducting material to prolong a coherence time of superconducting qubits, and wherein:
• an arrangement of the insulating layer between the first electrode layer and the second electrode layer forms the Josephson junction, and
• forming the second electrode layer on the insulating layer comprises forming a continuous bridge structure comprising:
• a first end formed on the insulating layer,
• a second end formed on the substrate structure, and
• a middle sub-electrode between the first and send ends, the middle sub-electrode being disposed over and forming an air gap from the substrate structure.

A device comprising a superconducting circuit, the superconducting circuit comprising a Josephson junction, and the Josephson junction comprising:

• a preset substrate;
• a first electrode layer for signal transmission;
• a second electrode layer for signal transmission;
• and
• an insulating layer arranged between the first electrode layer and the second electrode layer to form the Josephson junction,
• wherein, the first electrode layer and the second electrode layer are composed of a preset material, the insulating layer is composed of a compound corresponding to the preset material, and the preset material comprises a non-aluminum superconducting material, and
• wherein the first electrode layer is disposed on the preset substrate, the insulating layer is disposed on the first electrode layer, and the second electrode layer is a continuous bridge structure comprising:
• a first end disposed on the insulating layer,
• a second end arranged disposed on the preset substrate, and
• a middle sub-electrode between the first and send ends, the middle sub-electrode being disposed over and forming an air gap from the preset substrate.