CN114694893B - Preparation method of superconducting cable for quantum computer - Google Patents
Preparation method of superconducting cable for quantum computer Download PDFInfo
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- CN114694893B CN114694893B CN202210608662.1A CN202210608662A CN114694893B CN 114694893 B CN114694893 B CN 114694893B CN 202210608662 A CN202210608662 A CN 202210608662A CN 114694893 B CN114694893 B CN 114694893B
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
- H01B12/06—Films or wires on bases or cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
- H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
- H01B12/08—Stranded or braided wires
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R31/00—Coupling parts supported only by co-operation with counterpart
- H01R31/06—Intermediate parts for linking two coupling parts, e.g. adapter
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/68—Connections to or between superconductive connectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
Abstract
The invention relates to a preparation method of a superconducting cable for a quantum computer, which specifically comprises the following steps: obtaining a multi-core NbTi/Cu rod by a secondary tube threading method by using an oxygen-free copper tube and an NbTi rod, performing cold drawing on the multi-core NbTi/Cu rod to obtain a multi-core NbTi/Cu composite superconducting wire, and removing Cu in the multi-core NbTi/Cu composite superconducting wire by using a corrosive liquid to obtain a plurality of first-stage NbTi wires; selecting single NbTi wires at the central parts of a plurality of primary NbTi wires for lapping to obtain a plurality of strands of secondary NbTi wires; weaving a single NbTi wire subjected to insulation treatment by using a plurality of strands of secondary NbTi wires; and obtaining the superconducting cable for the quantum computer. The method selects NbTi/Cu superconducting multi-core bars with proper core number as raw materials, and prepares the superconducting cable material suitable for a quantum computer by drawing corrosion core wires, polytetrafluoroethylene tape wrapping and NbTi wire weaving technologies.
Description
Technical Field
The invention belongs to the technical field of superconducting cable preparation, and relates to a preparation method of a superconducting cable for a quantum computer.
Background
Quantum computing is a gate to encode logic information on two quantum states-qubits which are mutually converted, and a highly complex quantum central processing unit-quantum chip is constructed by using a qubit system. The quantum chip is utilized to realize the programmable operation of information stored in a complex quantum state, namely a quantum logic gate and a quantum algorithm, and finally the leading edge science of the quantum information processing process is realized. However, the working environment of the quantum chip needs to be below 30mK, and the superconducting wire has the characteristic of zero resistance at low temperature, so that the superconducting wire does not affect the low-temperature environment of the quantum chip, and is used for signal transmission in quantum computing. The preparation technology of the wire is monopolized abroad all the time, so that the preparation technology of the superconducting cable needs to be broken through as soon as possible.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a preparation method of a superconducting cable for a quantum computer, which selects NbTi/Cu superconducting multi-core bars with proper core number as raw materials, and successfully prepares the superconducting cable with extremely low-temperature resistance, good microwave transmission characteristic and strong heat conductivity and is suitable for the quantum computer by technologies of drawing and corroding core wires, wrapping Polytetrafluoroethylene (PTFE) strips, weaving NbTi wires and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing superconducting cable used for quantum computer is characterized in that
The method comprises the following steps:
s1, adopting an oxygen-free copper pipe and an NbTi rod as raw materials, and obtaining the alloy by adopting a secondary pipe penetration method
The method comprises the following steps of (1) carrying out cold drawing on a multi-core NbTi/Cu rod to obtain a multi-core NbTi/Cu composite superconducting wire, and then removing Cu in the multi-core NbTi/Cu composite superconducting wire by using corrosive liquid to obtain a multi-branch one-stage NbTi wire;
s2, selecting single NbTi wires at the central parts of the multiple primary NbTi wires in the step S1,
wrapping the filament by adopting a polytetrafluoroethylene strip, and simultaneously baking the filament on line to finish the insulation of a single NbTi filament at the central part;
s3, repeating the step S1 on the NbTi wire obtained in the step S2 to obtain a plurality of strands of secondary NbTi wires;
s4, insulating the secondary NbTi wires in step S2 by using a plurality of strands of secondary NbTi wires in step S3
Weaving single NbTi wire;
and S5, welding joints at two ends of the wire rod to finally obtain the superconducting cable for the quantum computer.
Further, the method for secondary pipe penetration in step S1 specifically includes: firstly, the NbTi rod penetrates into a small-specification copper pipe to obtain an NbTi/Cu rod, then a plurality of NbTi/Cu rods penetrate into a large-specification copper pipe, and then one end of the NbTi/Cu rod is swaged to ensure that the head of the NbTi/Cu rod smoothly penetrates through a die.
Furthermore, the outer diameter of the small-size copper pipe is 3-6 mm, the outer diameter of the large-size copper pipe is 13-34 mm, and the number of NbTi/Cu rods penetrating into the large-size copper pipe is 7 or 19.
Further, the content of Nb in the NbTi rod in step S1 is 50 to 60wt.%, and the diameter of the NbTi rod is 1 to 4 mm.
Furthermore, the diameter of the primary NbTi wire in the step S1 is 0.19-0.51 mm, and the diameter of the single insulated NbTi wire in the step S2 is 0.6-1.5 mm.
Further, the etching solution in the step S1 is a nitric acid solution with a concentration of 50-70%.
Further, in the step S2, the thickness of the polytetrafluoroethylene strip is 0.03-0.05 mm, the lapping and covering rate is 30-50%, the baking temperature is 250-400 ℃, and the baking time is 10-30S.
Further, in the step S3, the single NbTi wire and the oxygen-free copper tube obtained in the step S2 are used as raw materials, a 48-core NbTi/Cu composite superconducting wire is obtained by a secondary tube threading method and cold drawing, and the Cu in the 48-core NbTi/Cu composite superconducting wire is removed by using a nitric acid solution with a concentration of 50-70% to obtain 48 strands of secondary NbTi wires, wherein the diameter of the secondary NbTi wires is 0.05-0.1 mm.
Furthermore, the secondary NbTi wires in the step S4 have 48 strands in total, the speed of the braided wire is 10-30 m/h, the braiding pitch is 3-10 mm, the thickness of the insulating layer is 0.1-2 mm, and the diameter of the braided superconducting cable is 0.86-2.2 mm.
Further, the step S4 finds out which joint has the model of SMA, APC or GPPO.
Compared with the prior art, the invention has the following beneficial effects:
a superconducting cable for quantum computer is prepared from NbTi/Cu superconducting multi-core rod material with proper core number through drawing, corroding core wire, winding and insulating Polytetrafluoroethylene (PTFE) strip, and braiding superfine NbTi wire.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic cross-sectional view of a superconducting cable produced by the present invention;
wherein, 1, NbTi wire; 2. a polytetrafluoroethylene lapping tape; 3. a braided layer of NbTi.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus consistent with certain aspects of the invention, as detailed in the appended claims.
In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and examples.
A preparation method of a superconducting cable for a quantum computer comprises the following steps:
step 1, using an oxygen-free copper pipe and an NbTi rod as raw materials, using a secondary pipe penetration method, firstly penetrating the NbTi rod into a small-size copper pipe to obtain an NbTi/Cu rod, then penetrating the NbTi/Cu rod into a large-size copper pipe, then performing rotary swaging on one end to ensure that the head of the NbTi/Cu rod smoothly passes through a die, obtaining an NbTi/Cu composite superconducting wire by cold drawing, then removing Cu in the NbTi/Cu composite superconducting wire by using a corrosive liquid to obtain a plurality of primary NbTi wires, and selecting a single NbTi wire at the central part for lapping insulation;
the method comprises the following steps of performing rotary forging on NbTi rods, wherein the content of Nb in the NbTi rods is 50-60 wt%, the diameter of the NbTi rods is phi 1-4 mm, in order to obtain superfine NbTi wires with uniform deformation and good roundness, a method of secondary tube penetration and few drawing passes is adopted, the outer diameter of a small-size copper tube for primary tube penetration is 3-6 mm, the outer diameter of a large-size copper tube for secondary tube penetration is 13-34 mm, the number of the NbTi/Cu rods in the tube penetration is 7 or 19, the NbTi rods and a Cu shell are tightly combined in the rotary forging, meanwhile, the NbTi rods can penetrate through a drawing die, a nitric acid solution with the concentration of 50-70% is adopted to remove Cu, and single NbTi wires in the central part are extracted due to the best roundness and the best uniformity. And 2, wrapping the NbTi wire obtained in the step 1 by adopting a Polytetrafluoroethylene (PTFE) strip, and simultaneously baking the wrapped wire on line to finish the insulation of the NbTi wire.
And 2, because Polytetrafluoroethylene (PTFE) cannot be injected, wrapping the single NbTi wire at the central part obtained in the step 1 by using a Polytetrafluoroethylene (PTFE) strip, and simultaneously baking on line to finish the insulation of the NbTi wire. The purpose of using Polytetrafluoroethylene (PTFE) as the insulating material is that the operating temperature of the wire is 4K, at which the Polytetrafluoroethylene (PTFE) can still maintain good performance. The wrapping method can enhance the centrality of the NbTi wire, the thickness of a Polytetrafluoroethylene (PTFE) strip is 0.03-0.05 mm, the wrapping covering rate is 30-50%, the baking temperature is 250-400 ℃, and the baking time is 10-30 s.
And 3, obtaining a plurality of strands of secondary NbTi wires as NbTi wires for later use by adopting the same steps as the step 1. The number of cores of the NbTi/Cu composite superconducting bar is 48, the processing rate between drawing passes is 10-30%, the components of the corrosive liquid are nitric acid solution with the concentration of 50-70%, and the diameter of the obtained NbTi wire is 0.05-0.1 mm.
And 4, weaving the insulated NbTi wire obtained in the step 3 by using the NbTi wire obtained in the step 3 by using a weaving technology. In order to improve the weaving compactness, the number of strands of NbTi wires is 48 strands in the weaving process, the weaving speed and the weaving pitch are reduced, the weaving speed is 10-30 m/h, the weaving pitch is 3-10 mm, and the thickness of an insulating layer is 0.1-2 mm.
And 5, welding joints at two ends of the wire to finally obtain the superconducting cable for the quantum computer, wherein the joint model can be SMA, APC or GPPO.
The following is described with reference to specific process procedures:
example 1
Firstly, in order to obtain the superfine NbTi wire with uniform deformation and good roundness, a preparation method of secondary tube penetration and few drawing passes is adopted. In the first step, an oxygen-free copper tube with the outer diameter of phi 3mm and phi 13mm, a NbTi rod with the Nb content of 50wt.% and the diameter of phi 1mm is used as a raw material. Firstly, the NbTi rod penetrates into an oxygen-free copper pipe with the outer diameter of phi 3mm to obtain the NbTi/Cu rod. And then, penetrating 7 NbTi/Cu rods into an oxygen-free copper pipe with the outer diameter of phi 13mm to obtain 7-core NbTi/Cu rods, performing rotary swaging on one end of the 7-core NbTi/Cu rods to ensure that the head of the 7-core NbTi/Cu rods smoothly passes through a die, and performing cold drawing to obtain the 7-core NbTi/Cu composite superconducting wire.
Then, removing Cu by using nitric acid solution with the concentration of 50% to obtain 7 NbTi wires with the diameter of phi 0.51mm, selecting the middle part with the best roundness, and winding and insulating 1 NbTi wire with the most uniform deformation. And the lapping insulation adopts a Polytetrafluoroethylene (PTFE) strip, the thickness of the strip is 0.03mm, the lapping rate is 30%, and meanwhile, the wrapped NbTi wire is subjected to online baking at the baking temperature of 250 ℃ for 30s to obtain the NbTi wire with the diameter of phi 1.5 mm.
And preparing the 48-core NbTi/Cu composite superconducting wire by adopting a secondary tube penetrating and drawing method, and removing Cu by using a nitric acid solution with the concentration of 50% to obtain 48 NbTi wires with the diameter of phi 0.1 mm. In order to obtain a compact NbTi braided layer, 48 strands of NbTi wires with phi of 0.1mm are adopted to braid the insulated NbTi wires with phi of 1.5mm, and meanwhile, the braiding linear speed and the braiding pitch are reduced, wherein the braiding linear speed is 10m/h, the braiding pitch is 10mm, and the diameter after braiding is phi 2.2 mm. And finally, welding SMA joints at two ends of the wire to finally obtain the superconducting cable for the quantum computer, wherein the heat leakage rate of the cable is lower than 0.3 mu W/K at the temperature of 4-20K.
Example 2
Firstly, in order to obtain the superfine NbTi wire with uniform deformation and good roundness, a preparation method of secondary tube penetration and few drawing passes is adopted. In the first step, an oxygen-free copper tube with an outer diameter of phi 4mm and phi 15mm, a NbTi rod with a Nb content of 53wt.% and a diameter of phi 2mm is used as a raw material. Firstly, the NbTi rod penetrates into an oxygen-free copper pipe with the outer diameter of phi 4mm to obtain the NbTi/Cu rod. And then, penetrating 7 NbTi/Cu rods into an oxygen-free copper pipe with the outer diameter phi of 15mm to obtain 7-core NbTi/Cu rods, performing rotary swaging on one end of each 7-core NbTi/Cu rod to ensure that the head of each 7-core NbTi/Cu rod smoothly passes through a die, and performing cold drawing to obtain the 7-core NbTi/Cu composite superconducting wire. Then, removing Cu by using a nitric acid solution with the concentration of 55% to obtain 7 NbTi wires with the diameter of phi 0.31mm, selecting the middle part with the best roundness, and winding and insulating 1 NbTi wire with the most uniform deformation. And the lapping insulation adopts a Polytetrafluoroethylene (PTFE) strip, the thickness of the strip is 0.04mm, the lapping rate is 35%, and meanwhile, the wrapped NbTi wire is subjected to online baking at the baking temperature of 280 ℃ for 25s to obtain the NbTi wire with the diameter of phi 1.0 mm.
Then, a 48-core NbTi/Cu composite superconducting wire is prepared by adopting a secondary tube penetrating and drawing method, and then Cu is removed by using a nitric acid solution with the concentration of 60% to obtain 48 NbTi wires with the diameter of phi 0.08 mm. In order to obtain a compact NbTi braided layer, 48 strands of NbTi wires with phi of 0.08mm are adopted to braid the insulated NbTi wires with phi of 1.0mm, and meanwhile, the braiding linear speed and the braiding pitch are reduced, wherein the braiding linear speed is 15m/h, the braiding pitch is 8mm, and the diameter after braiding is phi 1.15 mm. And finally, welding SMA joints at two ends of the wire to finally obtain the superconducting cable for the quantum computer, wherein the heat leakage rate of the cable is lower than 0.09 mu W/K at the temperature of 4-20K.
Example 3
Firstly, in order to obtain the superfine NbTi wire with uniform deformation and good roundness, a preparation method of secondary tube penetration and few drawing passes is adopted. In the first step, an oxygen-free copper tube with the outer diameter of phi 5mm and phi 29mm, an NbTi rod with the Nb content of 55wt.% and the diameter of phi 3mm is used as a raw material. Firstly, the NbTi rod penetrates into an oxygen-free copper pipe with the outer diameter of phi 5mm to obtain the NbTi/Cu rod. And then, penetrating 19 NbTi/Cu rods into an oxygen-free copper pipe with the outer diameter of phi 29mm to obtain 19-core NbTi/Cu rods, performing rotary swaging on one end of the 19-core NbTi/Cu rods to ensure that the head of the 19-core NbTi/Cu rods smoothly passes through a die, and performing cold drawing to obtain the 19-core NbTi/Cu composite superconducting wire. Then, removing Cu by using a nitric acid solution with the concentration of 60% to obtain 19 NbTi wires with the diameter of phi 0.25mm, selecting the middle part with the best roundness, and winding and insulating 1 NbTi wire with the most uniform deformation. And the lapping insulation adopts a Polytetrafluoroethylene (PTFE) strip, the thickness of the strip is 0.04mm, the lapping rate is 40%, and meanwhile, the wrapped NbTi wire is subjected to online baking at the baking temperature of 350 ℃ for 20s to obtain the NbTi wire with the diameter of phi 0.8 mm.
And then preparing the 48-core NbTi/Cu composite superconducting wire by adopting a secondary tube penetrating and drawing method, and removing Cu by using a nitric acid solution with the concentration of 50-70% to obtain 48 NbTi wires with the diameter phi of 0.06 mm. In order to obtain a compact NbTi braided layer, 48 strands of NbTi wires with phi of 0.06mm are adopted to braid the insulated NbTi wires with phi of 0.8mm, and meanwhile, the braiding linear speed and the braiding pitch are reduced, wherein the braiding linear speed is 20m/h, the braiding pitch is 6mm, and the diameter after braiding is phi 1.0 mm. And finally, welding SMA joints at two ends of the wire to finally obtain the superconducting cable for the quantum computer, wherein the heat leakage rate of the cable is lower than 0.07 mu W/K at the temperature of 4-20K.
Example 4
Firstly, in order to obtain the superfine NbTi wire with uniform deformation and good roundness, a preparation method of secondary tube penetration and few drawing passes is adopted. In the first step, an oxygen-free copper tube with the outer diameter of phi 6mm and phi 34mm, an NbTi rod with the Nb content of 60wt.% and the diameter of phi 4mm is used as a raw material. Firstly, the NbTi rod penetrates into an oxygen-free copper pipe with the outer diameter of phi 6mm to obtain the NbTi/Cu rod. And then, penetrating 19 NbTi/Cu rods into an oxygen-free copper pipe with the outer diameter of phi 34mm to obtain 19-core NbTi/Cu rods, performing rotary swaging on one end of the 19-core NbTi/Cu rods to ensure that the head of the 19-core NbTi/Cu rods smoothly passes through a die, and performing cold drawing to obtain the 19-core NbTi/Cu composite superconducting wire. And then removing Cu by using nitric acid solution with the concentration of 70% to obtain 19 NbTi wires with the diameter of phi 0.19mm, selecting the middle part with the best roundness, and winding and insulating 1 NbTi wire with the most uniform deformation. And the lapping insulation adopts a Polytetrafluoroethylene (PTFE) strip, the thickness of the strip is 0.05mm, the lapping rate is 50%, and meanwhile, the wrapped NbTi wire is subjected to online baking at the baking temperature of 400 ℃ for 10s to obtain the NbTi wire with the diameter of phi 0.6 mm.
And then preparing the 48-core NbTi/Cu composite superconducting wire by adopting a secondary tube penetrating and drawing method, and removing Cu by using a nitric acid solution with the concentration of 50-70% to obtain 48 NbTi wires with the diameter of phi 0.05 mm. In order to obtain a compact NbTi braided layer, 48 NbTi wires with the diameter of 0.05mm are adopted to braid the insulated NbTi wires with the diameter of 0.6mm, and meanwhile, the braiding linear speed and the braiding pitch are reduced, wherein the braiding linear speed is 30m/h, the braiding pitch is 3mm, and the diameter after braiding is 0.86 mm. And finally, welding SMA joints at two ends of the wire to finally obtain the superconducting cable for the quantum computer, wherein the heat leakage rate of the cable is lower than 0.06 muW/K at the temperature of 4-20K.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.
It is to be understood that the present invention is not limited to what has been described above, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (9)
1. The preparation method of the superconducting cable for the quantum computer is characterized by comprising the following steps
The method comprises the following steps:
s1, obtaining the multi-core NbTi/Cu by a secondary tube penetration method by taking an oxygen-free copper tube and an NbTi rod as raw materials
A rod, wherein the multi-core NbTi/Cu rod is subjected to cold drawing to obtain a multi-core NbTi/Cu composite superconducting wire, and then Cu in the multi-core NbTi/Cu composite superconducting wire is removed by using corrosive liquid to obtain a multi-branch one-stage NbTi wire;
the secondary pipe penetration method comprises the following specific steps: firstly, the NbTi bar penetrates into a small-specification copper pipe to obtain an NbTi/Cu bar, then a plurality of NbTi/Cu bars penetrate into a large-specification copper pipe, and then one end of the NbTi/Cu bar is swaged in a rotating mode to ensure that the head of the NbTi/Cu bar smoothly penetrates through a die;
s2, selecting a single NbTi wire at the central part of the multi-primary NbTi wire in the step S1, and adopting poly-tetra
Wrapping the fluorine ethylene strip, and simultaneously baking the fluorine ethylene strip on line to finish the insulation of a single NbTi wire at the central part;
s3, taking an oxygen-free copper pipe and the NbTi wire obtained in the step S2 as raw materials, obtaining a multi-core NbTi/Cu wire through a secondary pipe penetrating method, carrying out cold drawing on the multi-core NbTi/Cu wire to obtain a multi-core NbTi/Cu composite superconducting wire, and then removing Cu in the multi-core NbTi/Cu composite superconducting wire through corrosive liquid to obtain a multi-strand secondary NbTi wire;
s4, using the multi-strand secondary NbTi wires in the step S3 to couple the single NbTi subjected to the insulation treatment in the step S2
Weaving the silk;
and S5, welding joints at two ends of the wire to finally obtain the superconducting cable for the quantum computer.
2. The method for preparing a superconducting cable for a quantum computer according to claim 1, wherein the outer diameter of the small-sized copper tube is 3-6 mm, the outer diameter of the large-sized copper tube is 13-34 mm, and the number of NbTi/Cu rods penetrating into the large-sized copper tube is 7 or 19.
3. The method as claimed in claim 1, wherein the NbTi rod in the step S1 contains Nb in an amount of 50 to 60wt.%, and the diameter of the NbTi rod is 1 to 4 mm.
4. The method as claimed in claim 1, wherein the diameter of the primary NbTi filament in step S1 is 0.19 to 0.51mm, and the diameter of the single NbTi filament insulated in step S2 is 0.6 to 1.5 mm.
5. The method for manufacturing a superconducting cable for a quantum computer according to claim 1, wherein the corrosive solution in the step S1 is a nitric acid solution with a concentration of 50-70%.
6. The method for preparing a superconducting cable for a quantum computer according to claim 1, wherein the polytetrafluoroethylene tape in the step S2 has a thickness of 0.03 to 0.05mm, a lapping coverage of 30 to 50%, a baking temperature of 250 to 400 ℃ and a baking time of 10 to 30S.
7. The method for preparing a superconducting cable for a quantum computer according to claim 1, which comprises
Characterized in that in the step S3, the single NbTi wire and the oxygen-free copper tube obtained in the step S2 are used as raw materials, a 48-core NbTi/Cu composite superconducting wire is obtained by a secondary tube penetration method and cold drawing, and the Cu in the 48-core NbTi/Cu composite superconducting wire is removed by using a nitric acid solution with the concentration of 50-70% to obtain 48 strands of secondary NbTi wires, wherein the diameter of each secondary NbTi wire is 0.05-0.1 mm.
8. The method as claimed in claim 1, wherein the number of the second grade NbTi filaments in step S4 is 48, the speed of the braided wire is 10 to 30m/h, the braiding pitch is 3 to 10mm, the thickness of the insulation layer is 0.1 to 2mm, and the diameter of the superconducting cable after braiding is 0.86 to 2.2 mm.
9. The method for manufacturing a superconducting cable for a quantum computer according to claim 1, wherein the joint of the step S5 is of SMA, APC or GPPO type.
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