954 results about "Superconducting material" patented technology

A coupling system may include an rf-SQUID having a loop of superconducting material interrupted by a compound Josephson junction; and a first magnetic flux inductor configured to selectively provide a mutual inductance coupling the first magnetic flux inductor to the compound Josephson junction, wherein the loop of superconducting material positioned with respect to a first and second qubits to provide respective mutual inductance coupling therebetween. The coupling system may further include a second magnetic flux inductor configured to selectively provide a second magnetic flux inductor mutual inductance coupling the second magnetic flux inductor to the compound Josephson junction. A superconducting processor may include the coupling system and two or more qubits. A method may include providing the first, the second and the third mutual inductances.

A sub-flux quantum generator includes an N-turn ring having a plurality of connected turns about a common aperture. The width of each respective turn in the N-turn ring exceeds the London penetration depth of a superconducting material used to make the respective turn. The generator includes a switching device configured to introduce a reversible localized break in the superconductivity of at least one turn in the N-turn ring. The generator includes a magnetism device configured to generate a magnetic field within the aperture of the N-turn ring. A method for biasing a superconducting structure that encompasses all or a portion of an N-turn ring. While a supercurrent is flowing through the N-turn ring, a quantized magnetic flux is introduced into the aperture of the N-turn ring using a reversible localized break in a turn in the ring. The quantized magnetic flux is trapped in the ring by removal of the localized break. The trapped flux biases the superconducting structure.

A superconducting structure that can operate, for example, as a qubit or a superconducting switch is presented. The structure includes a loop formed from two parts. A first part includes two superconducting materials separated by a junction. The junction can, for example, be a 45° grain boundary junction. The second part can couple the two superconducting materials across the junction. The second part includes a superconducting material coupled to each of the two superconducting materials of the first part through c-axis junctions. Further embodiments of the invention can be as a coherent unconventional superconducting switch, or a variable phase shift unconventional superconductor junction device.

A quantum processor is operable as a universal adiabatic quantum computing system. The quantum processor includes physical qubits, with at least a first and second communicative coupling available between pairs of qubits via an in-situ tunable superconducting capacitive coupler and an in-situ tunable superconducting inductive coupler, respectively. Tunable couplers provide diagonal and off-diagonal coupling. Compound Josephson junctions (CJJs) of the tunable couplers are responsive to a flux bias to tune a sign and magnitude of a sum of a capacitance of a fixed capacitor and a tunable capacitance which is mediated across a pair of coupling capacitors. The qubits may be hybrid qubits, operable in a flux regime or a charge regime. Qubits may include a pair of CJJs that interrupt a loop of material and which are separated by an island of superconducting material which is voltage biased with respect to a qubit body.

Nuclear magnetic resonance (NMR) signals are detected in microtesla fields. Prepolarization in millitesla fields is followed by detection with an untuned dc superconducting quantum interference device (SQUID) magnetometer. Because the sensitivity of the SQUID is frequency independent, both signal-to-noise ratio (SNR) and spectral resolution are enhanced by detecting the NMR signal in extremely low magnetic fields, where the NMR lines become very narrow even for grossly inhomogeneous measurement fields. Additional signal to noise benefits are obtained by use of a low noise polarization coil, comprising litz wire or superconducting materials. MRI in ultralow magnetic field is based on the NMR at ultralow fields. Gradient magnetic fields are applied, and images are constructed from the detected NMR signals.

Methods and apparatuses for magnetic resonance imaging (MRI) and/or magnetic resonance spectroscopy comprising a superconducting main magnet operable to generate a uniform magnetic field in an examination region, at least one superconducting gradient field coil operable to apply a respective at least one magnetic field gradient within the examination region, and at least one RF coil that is operable to transmit and receive radio frequency signals to and from the examination region, and that is configured for cooling and comprises at least one of (i) a non-superconducting material that when cooled to a temperature below room temperature has a conductivity higher than that of copper at that temperature and (ii) a superconducting material. The main magnet, the gradient coils, and each of the at least one RF coil of a given system may each be implemented as high temperature superconductor materials.

A high resolution NMR probe having two or more resonators, an inner resonator which is closely coupled to a sample and is used to stimulate and receive a response from one nuclear species, and an outer resonator to induce transitions in another nuclear species, wherein the resonators may be provided with cooling capability and may be made of superconducting material, and wherein the inner resonator may be a saddle coil or a birdcage coil with capability of being tuned, and wherein the outer resonator may be one or more spiral wound saddle coil.

The invention discloses a multi-field coupling test system for a superconducting material at the temperature of between 373 and 4.2K. The system comprises a large-sized temperature alternating experiment box, a liquid helium ultralow temperature vacuum Dewar flask, a Dewar flask bracket, a mechanical test experiment device, a liquid helium injection pipe, a plurality of heating bodies, an air circulating device and an air circulating fan, wherein the liquid helium ultralow temperature vacuum Dewar flask is sleeved inside the large-sized temperature alternating experiment box; the Dewar flask bracket is arranged at the bottom of a box body at the bottom of the liquid helium ultralow temperature vacuum Dewar flask; the mechanical test experiment device and the liquid helium injection pipe are arranged in coordination with the liquid helium ultralow temperature vacuum Dewar flask and the large-sized temperature alternating experiment box; the plurality of heating bodies are arranged inside the large-sized temperature alternating experiment box; the air circulating device is arranged behind the box body of the large-sized temperature alternating experiment box; and the air circulating fan is connected with the air circulating device through a bearing. By the multi-field coupling test system for the superconducting material at the temperature of between 373 and 4.2K, the defects of poor functions, small application ranges, long test time, high cost and the like in the prior art can be overcome, so that the system has the advantages of making a test sample conveniently replaced and saving test time, along with a powerful function, a wide application range and low cost.

This patent application relates to the use of thin high temperature fibers, specifically optical fibers, for use as a substrate material in the fabrication of long-length low temperature superconducting and high temperature superconducting wire. The superconducting material is deposited on the fiber using either a thin or thick film deposition technique. The fiber can have a dual use in the transmission of data using either traditional optical means or the transmission of electrical current via the deposited superconductor. A buffer layer or layers is used between the high temperature fiber and the superconductor to promote grain alignment and enhance the current carrying capacity of the wire.

The present invention relates to a novel MgB2 superconductivity material with high critical current density and its preparation method. It is characterized by that in the MgB2 superconductivity material, one method element Me selected from Ti, Zr, Mo, Nb, W or Hf is doped, and the mole ratio of its composition is Mg:Me:B=(0.8-0.9):(0.1-0.2):2. Its preparation method includes the steps of proportioning Mg powder, Me powder and B material component, mixing them uniformly and sintering at normal pressure in argon atmosphere. This invented MgB2 superconductivity material possesses high critical curcent density at above 10K temp., and its performance also is excellent under the magnetic field.

Systems, devices, articles, methods, and techniques for advancing quantum computing by removing unwanted interactions in one or more quantum processor. One approach includes creating an updated plurality of programmable parameters based at least in part on a received value for the characteristic magnetic susceptibility of the qubit in the at least one quantum processor, and returning the updated plurality of programmable parameters. Examples programmable parameters include local biases, and coupling values characterizing the problem Hamilton. Also, for example, a quantum processor may be summarized as including a first loop of superconducting material, a first compound Josephson junction interrupting the first loop of superconducting material, a first coupler inductively coupled to the first loop of superconducting material, a second coupler inductively coupled to the first loop of superconducting material, and a second loop of superconducting material proximally placed to the first loop of superconducting material inductively coupled to the first coupler and the second coupler.

The invention belongs to the field of superconducting material and relates to a superconducting strand based on a ReBCO high-temperature superconducting tape. The superconducting strand comprises a superconducting strand core and a coating layer. The ReBCO high-temperature superconducting tape is cut into tapes which are arranged and stacked to be the superconducting strand core with circular, square or rectangular cross section; the coating layer is made of copper tapes, aluminum tapes, aluminum alloy tapes, stainless steel tapes or ReBCO coating superconducting tapes; the coating layer is rolled and coated on the superconducting strand core. A laser Ag welding technology is used for carrying out butt-seam welding on the coating tapes. The superconducting strand provided by the invention expands the application range of the coating superconductor, improves engineering current density, flexibility and mechanical strength of the superconducting wire, and is applicable to a superconducting cable, a current guide wire, and the like.

The present invention relates to a method for measuring surface resistance and its device, which is used for detecting metal material and superconducting material, in particular, it is a method and measuring device for detecting surface resistance of high-temperature superconducting film material. It adopts a medium-loaded resonator whose one end is short-circuited and another end is in opened state. It can respectively measure two microwave media loaded resonant cavities in which the decribed microwave media are respectively formed from two medium columns which are identical in material and length and different in diameter, so that it can define the system quality factor value Qr correspondent to other loss except tested sample, and further can meausre tested sample so as to obtain the surface resistance R of tested sample.

The invention provides a superconducting magnet which comprises a vacuum container and a refrigerator. A cold screen and a superconducting coil are arranged in the vacuum container; superconducting wires are wound on a coil framework to form the superconducting coil, and two free ends of the superconducting coil are connected with a superconducting switch by superconducting connectors to form a closed superconducting circuit; the refrigerator is arranged on the vacuum container and comprises a primary cold head and a secondary cold head, and the primary cold head is thermally connected with the cold screen; the superconducting wires are made of superconducting materials with critical superconducting transit temperatures higher than 35 K; the superconducting connectors are made of superconducting welding flux with a low melting point, can be cooled by the aid of the secondary cold head or cooling media and accordingly can be assuredly in superconducting states. Compared with low-temperature closed-loop superconducting magnets in the prior art, the superconducting magnet has the advantage of high superconducting stability.

A new family of superconducting materials with critical temperature up to 55 K have recently been discovered, comprising a crystal structure with atomic layers of iron and arsenic alternating with atomic layers of rare-earth oxide or alkaline earth. The present invention identifies structures for integrated circuit elements (including Josephson junctions) in these and related materials. These superconducting circuit elements will operate at a higher temperature than low-temperature superconductors such as niobium, and may be easier to manufacture than prior-art high-temperature superconductors based on copper-oxides.

An apparatus including a persistent current switch of a superconducting material which is electrically superconducting at a superconducting temperature and electrically resistive at a resistive mode temperature which is greater than the superconducting temperature. The apparatus further includes a first heat exchange element; a convective heat dissipation loop thermally coupling the persistent current switch to the first heat exchange element; a second heat exchange element spaced apart from the first heat exchange element; and a thermally conductive link thermally coupling the persistent current switch to the second heat exchange element. The first heat exchange element is disposed above the persistent current switch. The thermally conductive link may have a greater thermal conductivity at the superconducting temperature than at a second temperature which is greater than the superconducting temperature.

The invention discloses a preparation method of a high-density Fe(Se,Te) superconducting material. The method comprises steps as follows: step one, ferrous powder, selenium powder and tellurium powder are mixed to form mixed powder, and the mixed powder is placed in a vacuum ball milling tank; step two, the mixed powder is subjected to high-energy ball milling; step three, the mixed powder is pressed, and a Fe(Se,Te) green body is obtained; step four, the Fe(Se,Te) green body is sintered, and the Fe(Se,Te) superconducting material is obtained. The mole ratio of the ferrous powder to the selenium powder to the tellurium powder in the mixed powder is adjusted and controlled, the Fe content in the generated tetragonal phase Fe(Se, Te) is optimized, the mixed powder is subjected to high-energy ball milling in shorter time by means of a high-energy ball mill, limit to the reaction rate in the diffusion process during sintering is eliminated, holes formed after melting of the selenium powder are avoided, and the high-density Fe(Se,Te) superconducting material with high superconducting phase content is obtained.

An amorphous silicon (a-Si) dielectric for superconducting electronics is fabricated with reduced loss tangent by fluorine passivation throughout the bulk of the layer. Complete layers or thinner sub-layers of a-Si are formed by physical vapor deposition at low temperatures (<350 C, e.g. ˜200 C) to prevent reaction with superconducting materials, then exposed to fluorine. The fluorine may be a component of a gas or plasma, or it may be a component of an interface layer. The fluorine is driven into the a-Si by heat (e.g., <350 C) or impact to passivate defects such as dangling bonds.

A superconducting cable includes at least one layer of tapes of superconducting material circumferentially wound side by side on a support at a prefixed distance forming gaps circumferentially among adjacent tapes. Within the superconducting cable, a non-superconducting material is interposed between adjacent tapes to partially fill the gaps.

The invention discloses a method for preparing a FeSe-based superconducting material. The method comprises the following steps: 1, putting mixed powder of iron powder and selenium powder into a vacuum ball-milling tank; 2, performing high energy ball-milling treatment on the mixed powder; 3, pressing the mixed powder to obtain a FeSe-base blank; and 4, sintering the FeSe-base blank, thereby obtaining the FeSe-based superconducting material. According to the method disclosed by the invention, a high energy ball-milling machine is adopted to perform high energy ball-milling treatment on the mixed powder within a relatively short time firstly, after the sizes of original grains of the mixed powder are reduced, a Fe-Se solid solution is obtained, Fe and Se in the mixed powder reach atom-grade mixing, the limit on reaction rate in the dispersion process in the sintering treatment is eliminated, the mixed powder is laminated and is subsequently sintered, thereby obtaining the FeSe-based superconducting material with high superconducting phase content and advantages of small energy consumption, short process, high repeatability and the like.

Aiming at the current situations that in the electronic waste treatment process, high lead-containing cathode-ray tube (CRT) cone-glass is short of recycling technologies, is optionally discarded and stacked and severely pollutes the environment, the invention provides a process for removing lead in the lead-containing cone-glass, enabling the lead-containing cone-glass to be harmless and simultaneously preparing nano-lead particles with high added values. The invention is characterized by comprising the following steps: properly pre-treating the lead-containing glass, and then, adding a reducing agent; removing the lead in the cone-glass under certain atmospheric conditions; and condensing and collecting the removed lead on a special collector to form nano-lead, thereby realizing the purposes of removing the lead and synthesizing the nano-lead in one step. The process has the characteristics of controllable particle diameter of nano-particles and low cost and is simple and convenientin operation, and the lead removing rate can reach more than 95%, the purity of the prepared nano-lead is more than 95%, and the particle diameter is 5nm-15nm. The product has wide application prospects in production of high radiation protection materials, superconducting materials and special industrial catalysts.

The invention discloses a preparation method of a rectangular multicore composite superconductive strip. The preparation method comprises the following steps of step one. preparing mixed slurry by using amorphous boron powder, magnesium powder and a malic acid ethanol solution; step two. preparing tubing precursor powder; step three. tubing, carrying out rotary swaging, and drawing, thus obtaining a Cu-Nb-MgB2 single-core rod; step four. placing the Cu-Nb-MgB2 single-core rod and a Cu-NbTi single-core rod in a Cu-Ni alloy tube for secondary packaging, thus obtaining a secondary complex; five. processing the secondary complex into a wire rod, then carrying out rotary swaging and drawing so as to obtain a rectangular multicore composite strip; step six. winding a high-silica glass fiber to form a disk, and clamping the two ends of the disk to be flat; and step seven. carrying out thermal treatment so as to obtain the rectangular multicore composite superconductive strip. Compared with a single MgB2 and NbTi superconducting material, the composite superconductive strip prepared by the method is relatively wide in temperature using range and has relatively high using magnetic field.