Low loss conductive line using bridged conductor

A method, comprising:

• forming a substrate of a quantum device;
• and
• forming a coplanar waveguide, comprising:
• a first return conductor line,
• a second return conductor line, and
• a central conductor line located between and separated from the first return line conductor line and the second return conductor line, wherein the central conductor line comprises one or more base conductor portions disposed directly on the substrate, and a bridge conductor portion disposed over a portion of the substrate, wherein a gap of a defined distance is formed between the bridge conductor portion of the conductor line and a surface of the portion of the substrate that is facing the bridge conductor portion.

A computer program product that facilitates creating a quantum computing circuit, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions are executable by a processor to cause the processor to:

• form a dielectric substrate comprising a dielectric material to enable creation of circuit components of the quantum computing circuit;
• and
• form a coplanar waveguide, comprising:
• a first return conductor line,
• a second return conductor line, and
• a central conductor line located between and separated from the first return line conductor line and the second return conductor line, wherein the central conductor line comprises one or more base conductor portions disposed directly on the dielectric substrate, and a bridge portion disposed over a portion of the dielectric substrate, wherein a gap of a defined distance is formed between the bridge portion of the central conductor line and a surface of the portion of the dielectric substrate that is facing the bridge portion, and wherein the conductor line comprises a superconductor material.

A system, comprising:

• a memory that stores computer-executable components;
• and
• a processor, operatively coupled to the memory, that executes the computer-executable components, the computer-executable components comprising:
• a substrate formation component that forms a dielectric substrate as part of a quantum computing circuit;
• and
• a conductor formation component that forms a coplanar waveguide, comprising:
• a first return conductor line,
• a second return conductor line, and
• a central conductor line located between and separated from the first return line conductor line and the second return conductor line, wherein the central conductor line comprises one or more base conductor portions disposed directly on the dielectric substrate, and a bridge conductor portion positioned over a portion of the dielectric substrate, wherein a space of a defined distance is formed between the bridge conductor portion of the central conductor line and a surface of the portion of the dielectric substrate that is facing the bridge conductor portion.

A computer program product that facilitates forming a quantum computing circuit, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions are executable by a processor to cause the processor to:

• form a substrate comprising a dielectric material to enable creation of circuit components of the quantum computing circuit;
• and
• form a coplanar waveguide, comprising:
• a first return conductor line,
• a second return conductor line, and
• a central conductor line located between and separated from the first return line conductor line and the second return conductor line, wherein the central conductor line comprises one or more base conductor portions disposed directly on the substrate, and a bridge conductor portion positioned over a portion of the substrate, wherein a space of a defined distance is formed between the bridge conductor portion of the conductor line and a surface of the portion of the substrate that is facing the bridge conductor portion.