Techniques regarding parallel gradiometric SQUIDs and the manufacturing thereof are provided. For example, one or more embodiments described herein can comprise an apparatus, which can comprise a first pattern of superconducting material located on a substrate. Also, the apparatus can comprise a second pattern of superconducting material that can extend across the first pattern of superconducting material at a position. Further, the apparatus can comprise a Josephson junction located at the position, which can comprise an insulating barrier that can connect the first pattern of superconductor material and the second pattern of superconductor material.

A high temperature superconductor, HTS, tape (100) for detecting a quench in a superconducting magnet. The HTS tape comprises an HTS layer (101) of HTS material supported by a substrate (102). The HTS layer is divided into a plurality of strips (104,105,107). The strips are connected (106) in series along an open path.

A method for manufacturing an HTS coated tape (34) includes providing a substrate tape (1), depositing a textured buffer layer (3) onto a front side (7) of the substrate tape, depositing an HTS layer (32) onto the front side, and depositing a functional layer (2) onto a bottom side (6) of the substrate tape. The functional layer exerts a mechanically deforming effect on the substrate tape opposing a mechanically deforming effect on the substrate tape exerted by the textured buffer layer deposited on the front. The functional layer is at least partially deposited before and/or during the depositing of the textured buffer layer. This permits an HTS coated tape, with which higher critical currents of the HTS layer are achieved, to be produced.

Operational characteristics of an extremely low resistance (ELR) film comprised of an ELR material may be improved by depositing a modifying material onto appropriate surfaces of the ELR film to create a modified ELR film. In some implementations of the invention, the ELR film may be in the form of a c-film. In some implementations of the invention, the ELR film may be in the form of an a-b film, an a-film or a b-film. The modified ELR film has improved operational characteristics over the ELR film alone or without the modifying material. Such operational characteristics may include operating in an ELR state at increased temperatures, carrying additional electrical charge, operating with improved magnetic properties, operating with improved mechanic properties or other improved operational characteristics. In some implementations of the invention, the ELR material is a mixed-valence copper-oxide perovskite, such as, but not limited to YBCO. In some implementations of the invention, the modifying material is a conductive material that bonds easily to oxygen, such as, but not limited to, chromium.

An ultra-thin film superconducting tape and method for fabricating same is disclosed. Embodiments are directed to a superconducting tape being fabricated by processes which include removing a portion of the superconducting tape's substrate subsequent the substrate's initial formation, whereby a thickness of the superconducting tape is reduced to 15-80 m.

The invention includes methods, and the structures formed, for multi-qubit chips. The methods may include annealing a Josephson junction of a qubit to either increase or decrease the frequency of the qubit. The conditions of the anneal may be based on historical conditions, and may be chosen to tune each qubit to a desired frequency.

A tape type superconductor (1), extending in longitudinal direction (LD), includes a substrate tape (2), at least one buffer layer (3), a superconductor layer (4), and plural elongated barrier structures (5, 5a, 5b). The superconductor layer has a width W.sub.SL in a direction (WD) that is perpendicular to the longitudinal direction and runs parallel to a flat side (8) of the substrate tape. The tape type superconductor has a longitudinal length L.sub.TTS t, and the elongated barrier structures are oriented in parallel with the longitudinal direction. A respective barrier structure has a longitudinal length L.sub.BS, with L.sub.BS0.20*W.sub.SL and L.sub.BS0.20*L.sub.TTS. The barrier structures are distributed longitudinally, are located at least partially in the superconductor layer, and impede a superconducting current flow in width direction across a respective barrier structure. This tape type superconductor achieves high critical currents simply and over extended tape lengths with suppressed magnetization.

The invention includes methods, and the structures formed, for multi-qubit chips. The methods may include annealing a Josephson junction of a qubit to either increase or decrease the frequency of the qubit. The conditions of the anneal may be based on historical conditions, and may be chosen to tune each qubit to a desired frequency.

The invention includes methods, and the structures formed, for multi-qubit chips. The methods may include annealing a Josephson junction of a qubit to either increase or decrease the frequency of the qubit. The conditions of the anneal may be based on historical conditions, and may be chosen to tune each qubit to a desired frequency.

A joined body includes: a first superconducting layer, a barrier layer arranged on the first superconducting layer, and a second superconducting layer arranged on the barrier layer. The first superconducting layer, the barrier layer, and the second superconducting layer are formed of a REBCO. A leak current from one of the first superconducting layer and the second superconducting layer to the other of the first superconducting layer and the second superconducting layer is blocked by the barrier layer.