Superconducting articles are disclosed which comprise at least two superconducting tapes (10, 20), each tape comprising a stabilizer layer (15, 25), a superconductor layer (13, 23), and a buffer layer (12, 22) formed in that order on a substrate (11, 21), and at least one metal tape (1) attached to the superconducting tapes via a solder layer (2) along at least twice the length of a joint region where the two superconducting tapes overlap or are overlapped by a bridge (30).

The present invention provides a joint portion of MgB.sub.2 superconducting wires having exceptional energization characteristics and high reliability. The joint portion of the superconducting wires according to the present invention has a space for filling Mg into a portion inside a container or pressurizing member, the portion not being adjacent to an MgB.sub.2 sintered body.

The present invention provides a joint portion of MgB.sub.2 superconducting wires having exceptional energization characteristics and high reliability. The joint portion of the superconducting wires according to the present invention has a space for filling Mg into a portion inside a container or pressurizing member, the portion not being adjacent to an MgB.sub.2 sintered body.

A connection system for a quantum computer that employs constant impedance connectors with attenuation or filtering components or both embedded therein or within an adaptor removably insertable within an adaptor housing for use in a cryogenically cooled quantum computer. The connection system provides a higher density of cables traversing through a hermetic sealed top plate, and which are accessible to chill blocks to reduce the thermal energy from the signal lines. Attenuators or filter circuits are embedded in the constant impedance connector housings, or provided in adaptors that connect on each end to form mating constant impedance connections, in order to reduce signal strength as the signal progresses through the cryogenic environment and to remove extraneous electrical signal noise.

A connection system for a quantum computer that employs constant impedance connectors with attenuation or filtering components or both embedded therein or within an adaptor removably insertable within an adaptor housing for use in a cryogenically cooled quantum computer. The connection system provides a higher density of cables traversing through a hermetic sealed top plate, and which are accessible to chill blocks to reduce the thermal energy from the signal lines. Attenuators or filter circuits are embedded in the constant impedance connector housings, or provided in adaptors that connect on each end to form mating constant impedance connections, in order to reduce signal strength as the signal progresses through the cryogenic environment and to remove extraneous electrical signal noise.

A connection system for a quantum computer that employs constant impedance connectors with attenuation or filtering components or both embedded therein or within an adaptor removably insertable within an adaptor housing for use in a cryogenically cooled quantum computer. The connection system provides a higher density of cables traversing through a hermetic sealed top plate, and which are accessible to chill blocks to reduce the thermal energy from the signal lines. Attenuators or filter circuits are embedded in the constant impedance connector housings, or provided in adaptors that connect on each end to form mating constant impedance connections, in order to reduce signal strength as the signal progresses through the cryogenic environment and to remove extraneous electrical signal noise.

An oxide superconducting wire connection structure includes: a connection target wire including a first oxide superconducting wire that includes a first superconducting layer on a first substrate; and a connection superconducting wire including a second superconducting wire that includes a second superconducting layer on a second substrate. The connection target wire is connected to the connection superconducting wire. The first superconducting layer faces the second superconducting layer. In a portion of the connection superconducting wire at least facing the connection target wire, the second superconducting layer is divided into a plurality of portions in a width direction of the second substrate via non-orientation portions extending in a longitudinal direction of the second substrate. The non-orientation portions contain an oxide material that is same as the second superconducting layer.

An oxide superconducting wire connection structure includes: a connection target wire including a first oxide superconducting wire that includes a first superconducting layer on a first substrate; and a connection superconducting wire including a second superconducting wire that includes a second superconducting layer on a second substrate. The connection target wire is connected to the connection superconducting wire. The first superconducting layer faces the second superconducting layer. In a portion of the connection superconducting wire at least facing the connection target wire, the second superconducting layer is divided into a plurality of portions in a width direction of the second substrate via non-orientation portions extending in a longitudinal direction of the second substrate. The non-orientation portions contain an oxide material that is same as the second superconducting layer.

A superconducting electrical power distribution network has a superconducting bus bar and superconducting cables electrically connected to the bus bar at respective joints distributed along the bus bar. The network further has a first coolant system for providing first cryogenic fluid and first circuits for circulating the first cryogenic fluid provided by the first coolant system. The first circuits comprise: a bus bar flow path which extends along and thereby cools the bus bar, cable flow paths which respectively extend along and thereby cool the cables, cooling junctions where the bus bar and cable flow paths meet at the electrical connection joints, inflow lines which send the first cryogenic fluid from the first coolant system to the flow paths, and outflow lines which remove the first cryogenic fluid from the flow paths.

A superconducting electrical power distribution system has a superconducting bus bar and one or more bus bar thermal conductor lines extending in thermal proximity along the bus bar to receive heat from the bus bar over the length of the bus bar. The system further has superconducting cables electrically connected to the bus bar at respective electrical joints distributed along the bus bar. The system further has a cryogenic cooling sub-system. The system further has a network comprising first and second thermal conductor lines, each line comprising a cold end which is cooled by the cryogenic cooling sub-system, and an opposite hot end, whereby heat received by each line is normally conducted along the line in a direction from its hot end to its cold end.