A method for manufacturing a novel integrated superconducting cable for quantum computers

Abstract

The application discloses a preparation method of a novel integrated superconducting cable for a quantum computer and relates to the technical field of superconducting composite cable processing, and comprises the following steps: NbTi filaments are wound and insulated by PTFE belts, then online annealing and solidification are carried out, plated tin copper wires are woven and then inserted into NbTi capillary tubes, plated tin copper wires are woven to obtain woven signal transmission components; a plurality of NbTi rods are installed into holes of a multi-hole copper ingot, after multi-pass drawing, the uneven head and tail portions are sawed off, plated tin copper wires are woven to obtain woven current transmission components; the woven signal transmission components and the woven current transmission components are assembled into holes of a multi-hole PTFE block to obtain the integrated superconducting cable. Through the combination of winding and insulation, online annealing and solidification, weaving, drawing and assembling technologies, the integration of the signal transmission and current transmission functions of the superconducting cable for the quantum computer is realized, and the space of the dilution refrigerator is saved.

Description

Technical Field

[0001] The present application relates to the technical field of superconducting composite cable processing, and in particular to a method for preparing a novel integrated superconducting cable for quantum computers. Background Art

[0002] Superconducting coaxial cables, with their extremely low heat leakage and signal attenuation, serve as a bridge between cryogenic quantum chips and room-temperature measurement and control systems in superconducting quantum computers. They are primarily used for qubit signal transmission, modulation, and output measurement. As the number of superconducting qubits increases, the limited space in the dilution refrigerator increases, requiring more superconducting coaxial cables for signal transmission and more superconducting cables for component power supply. Interference between the cables can also affect the stability of the quantum computer's operation. Therefore, it is necessary to develop a superconducting cable that can transmit both signals and current.

[0003] In the prior art, Chinese patent CN117936185A discloses a method for preparing a superconducting cable for a multi-channel cluster quantum computer. The superconducting cable prepared by this method is used for transmitting quantum bit signals. Chinese patent CN117476286A discloses a method for preparing a high critical current density NbTi superconducting wire. The superconducting cable prepared by this method is used for current transmission.

[0004] Currently, there is no superconducting cable that has both signal transmission and current transmission functions. The increasing demand for existing superconducting coaxial cables for signal transmission and superconducting cables for component power supply has limited the space for dilution refrigerators. Summary of the Invention

[0005] The present application provides a method for preparing a novel integrated superconducting cable for quantum computers, which is used to solve the problem that the increasing demand for existing superconducting coaxial cables for signal transmission and superconducting cables for component power supply has limited space for dilution refrigerators.

[0006] In one aspect, the present application provides a method for preparing a novel integrated superconducting cable for a quantum computer, comprising the following steps:

[0007] Step 1: Use PTFE tape to wrap the NbTi wire for insulation, and then perform online annealing and curing to obtain an insulated and cured NbTi wire. Use tinned copper wire to braid the surface of the insulated and cured NbTi wire and then insert it into the NbTi capillary to obtain a signal transmission component. Use tinned copper wire to braid the surface of the signal transmission component to obtain a braided signal transmission component.

[0008] Step 2: Load multiple NbTi rods into the holes of a porous copper ingot to obtain a NbTi / Cu composite ingot. After multiple drawing passes, saw off the uneven parts at the head and tail to obtain a current transmission component. Tinned copper wire is used to weave the surface of the current transmission component to obtain a braided current transmission component. The braided current transmission component has the same specifications as the braided signal transmission component.

[0009] Step three: using a porous PTFE block as an integrated module, assembling a plurality of the braided signal transmission components and a plurality of the braided current transmission components into the holes of the porous PTFE block to obtain an integrated superconducting cable.

[0010] In one possible implementation, in step one, the diameter of the NbTi wire is 0.1~0.2 mm, the diameter of the insulating solidified NbTi wire is 0.2~0.3 mm, the diameter of the insulating solidified NbTi wire after braiding is 0.3~0.4 mm, the outer diameter of the NbTi capillary is 0.5~0.7 mm, the inner diameter is 0.3~0.4 mm, and the diameter of the braided signal transmission component is 0.6~0.8 mm.

[0011] In a possible implementation, in step 1, the thickness of the PTFE tape is 0.01-0.03 mm, the insulation is wrapped 2-3 times, and the overlap rate is 90%-95%.

[0012] In a possible implementation, in step 1, the temperature of the online annealing and curing is 150-200° C., and the speed is 10-20 m / min.

[0013] In a possible implementation, in step 1, after penetrating into the NbTi capillary, stretching is performed with a processing rate of 1% to 2%.

[0014] In one possible implementation, in step 2, the diameter of the porous copper ingot is 15-18 mm, the diameter of the current transmission element is 0.5-0.7 mm, and the diameter of the braided current transmission element is 0.6-0.8 mm.

[0015] In one possible implementation, in step 2, the multi-pass drawing includes:

[0016] When the diameter of the NbTi / Cu composite ingot is greater than 10 mm, a pass processing rate of 5% to 10% is adopted.

[0017] When the diameter of the NbTi / Cu composite ingot is greater than 1 mm and less than or equal to 10 mm, a pass processing rate of 20% to 30% is adopted.

[0018] When the diameter of the NbTi / Cu composite ingot is less than or equal to 1 mm, a pass processing rate of 10% to 20% is adopted.

[0019] Annealing and aging heat treatment are not performed during the multi-pass drawing process.

[0020] In a possible implementation, in step 1 and step 2, the diameter of the tinned copper wire used for braiding is 0.01-0.03 mm.

[0021] In a possible implementation, in step three, the pore diameter of the porous PTFE block is 0.2-0.5 mm larger than the diameter of the braided signal transmission component and the braided current transmission component.

[0022] When assembling a plurality of the braided signal transmission components and a plurality of the braided current transmission components into the holes of the porous PTFE block, the braided signal transmission components and the braided current transmission components are assembled adjacent to each other, that is, the braided signal transmission components and the braided current transmission components are arranged alternately.

[0023] In a possible implementation, in step three, the assembled porous PTFE block is subjected to online hot rolling.

[0024] The temperature of the online hot rolling is 150-200° C., the rolling speed is 20-30 m / min, and the processing rate is 1%-5%.

[0025] The method for preparing a novel integrated superconducting cable for a quantum computer in this application has the following advantages:

[0026] By combining wrapping insulation, online annealing and curing, weaving, drawing and assembly technologies, the integration of signal transmission and current transmission functions of superconducting cables for quantum computers is achieved, saving space for dilution refrigerators.

[0027] By weaving tinned copper wire on the surface of the insulated solidified NbTi wire and then inserting it into the NbTi capillary, mutual interference of high-frequency signals in the inner conductor and outer conductor of the signal transmission component is avoided.

[0028] By weaving tinned copper wire on the surface of the signal transmission component and tinned copper wire on the surface of the current transmission component, after the integrated superconducting cable is assembled, the interference between different transmission components is suppressed and the stability of the integrated superconducting cable is improved.

[0029] After penetrating into the NbTi capillary, it is stretched at a processing rate of 1% to 2%, which plays a role in filling the pores.

[0030] It is proposed that when the diameter of the NbTi / Cu composite ingot is greater than 10 mm, a pass processing rate of 5% to 10% is used to reduce the gap between NbTi and Cu, laying the foundation for the subsequent coordinated deformation of multiple NbTi rods; when the diameter of the NbTi / Cu composite ingot is greater than 1 mm and less than or equal to 10 mm, a pass processing rate of 20% to 30% is used to concentrate the pressure transmission and promote coordinated deformation; when the diameter of the NbTi / Cu composite ingot is less than or equal to 1 mm, a pass processing rate of 10% to 20% is used to promote the shaping of the current transmission component and prevent the NbTi core from breaking due to excessive stress.

[0031] The proposed multi-pass drawing process does not require annealing and aging heat treatment. Annealing is not performed because the current transmission component mainly transmits current at the microampere level and has a small carrying current. There is no need for aging heat treatment to precipitate the α-Ti phase, thereby reducing process costs.

[0032] In the proposed steps 1 and 2, the diameter of the tinned copper wire used for braiding is 0.01-0.03 mm, which increases the braiding density and enhances the shielding effect.

[0033] The pore diameter of the proposed porous PTFE block is 0.2-0.5 mm larger than the diameter of the braided signal transmission component and the braided current transmission component, which facilitates the assembly of the components.

[0034] The proposed braided signal transmission component and the braided current transmission component are assembled adjacent to each other to prevent the same type of transmission components from interfering with each other.

[0035] The proposed online hot rolling of the assembled porous PTFE block reduces the gap inside the integrated superconducting cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0037] Figure 1 A schematic diagram of a process for preparing a novel integrated superconducting cable for a quantum computer provided in an embodiment of the present application;

[0038] Figure 2 A schematic cross-sectional view of a braided signal transmission component provided in an embodiment of the present application;

[0039] Figure 3 A schematic cross-sectional view of a braided current transmission component provided in an embodiment of the present application;

[0040] Figure 4 A schematic cross-sectional view of an integrated superconducting cable provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0042] like Figure 1 As shown, the embodiment of the present application provides a method for preparing a novel integrated superconducting cable for a quantum computer, comprising the following steps:

[0043] Step 1: Use PTFE tape to wrap the NbTi wire for insulation, then perform online annealing and curing to obtain an insulated and cured NbTi wire. Use tinned copper wire to braid the surface of the insulated and cured NbTi wire and then insert it into the NbTi capillary to obtain a signal transmission component. Use tinned copper wire to braid the surface of the signal transmission component to obtain a braided signal transmission component. The cross-sectional schematic diagram of the braided signal transmission component is shown in FIG. Figure 2 shown.

[0044] Step 2: Multiple NbTi rods are placed into the holes of a porous copper ingot to obtain a NbTi / Cu composite ingot. After multiple drawing passes, the uneven parts at the head and tail are sawed off to obtain a current transmission component. Tinned copper wire is used to weave the surface of the current transmission component to obtain a braided current transmission component. The braided current transmission component has the same specifications as the braided signal transmission component. The cross-sectional schematic diagram of the braided current transmission component is shown in FIG. Figure 3 shown.

[0045] Step 3: Use a porous PTFE block as an integrated module, assemble several braided signal transmission components and several braided current transmission components into the holes of the porous PTFE block to obtain an integrated superconducting cable. Figure 4 shown.

[0046] Example 1:

[0047] In this embodiment, in step 1, a 0.1 mm diameter NbTi wire is wrapped with 0.01 mm thick PTFE tape for insulation, the wrapping frequency being 2 times and the overlap ratio being 95%. Online annealing and curing are then performed at a temperature of 150°C and a speed of 20 m / min to obtain an insulated and cured NbTi wire having a diameter of 0.2 mm. Tinned copper wire having a diameter of 0.01 mm is braided on the surface of the insulated and cured NbTi wire, resulting in a diameter of 0.3 mm. The braided insulated and cured NbTi wire is then inserted into a NbTi capillary tube having an outer diameter of 0.5 mm and an inner diameter of 0.3 mm and stretched at a processing rate of 1% to obtain a signal transmission component. Tinned copper wire having a diameter of 0.01 mm is braided on the surface of the signal transmission component to obtain a braided signal transmission component having a diameter of 0.6 mm.

[0048] In this embodiment, in step 2, a porous copper ingot with a diameter of 15 mm is selected, and NbTi rods corresponding to the number of holes in the porous copper ingot are inserted into the holes of the porous copper ingot to obtain a NbTi / Cu composite ingot. Multi-pass drawing is performed, including: when the diameter of the NbTi / Cu composite ingot is greater than 10 mm, a pass processing rate of 5% to 10% is adopted; when the diameter of the NbTi / Cu composite ingot is greater than 1 mm and less than or equal to 10 mm, a pass processing rate of 20% to 30% is adopted; when the diameter of the NbTi / Cu composite ingot is less than or equal to 1 mm, a pass processing rate of 10% to 20% is adopted. Annealing and aging heat treatment are not performed during the multi-pass drawing process. After the multi-pass drawing, the uneven portions at the head and tail are sawed off to obtain a current transmission component with a diameter of 0.5 mm. Tinned copper wire with a diameter of 0.01 mm is used to weave the surface of the signal transmission component to obtain a braided signal transmission component, and the diameter of the braided current transmission component is 0.6 mm.

[0049] In this embodiment, in step three, a porous PTFE block is used as an integrated module. The pore diameter of the porous PTFE block is 0.2 mm larger than the diameter of the braided signal transmission component and the braided current transmission component. Several braided signal transmission components and several braided current transmission components are assembled into the pores of the porous PTFE block. The braided signal transmission components and the braided current transmission components are assembled adjacent to each other, that is, the braided signal transmission components and the braided current transmission components are arranged alternately. The assembled porous PTFE block is subjected to online hot rolling at a temperature of 150°C, a rolling speed of 30 m / min, and a processing rate of 1% to obtain an integrated superconducting cable.

[0050] After installation testing, in the integrated superconducting cable obtained in Example 1, the critical current of the current transmission component is 20A, and the measured signal attenuation value of the signal transmission component is 0.02dB / m, which meets the use requirements of superconducting quantum computers.

[0051] Example 2:

[0052] In this embodiment, in step 1, a 0.2 mm diameter NbTi wire is wrapped with 0.02 mm thick PTFE tape for insulation, the insulation wrapping is repeated twice, and the overlap ratio is 93%. Online annealing and curing are then performed at a temperature of 180°C and a speed of 15 m / min to obtain an insulated and cured NbTi wire having a diameter of 0.25 mm. Tinned copper wire having a diameter of 0.02 mm is braided on the surface of the insulated and cured NbTi wire. The braided insulated and cured NbTi wire has a diameter of 0.35 mm and is inserted into a NbTi capillary tube with an outer diameter of 0.6 mm and an inner diameter of 0.35 mm. Stretching is performed at a processing rate of 1.5% to obtain a signal transmission component. Tinned copper wire having a diameter of 0.02 mm is braided on the surface of the signal transmission component to obtain a braided signal transmission component having a diameter of 0.7 mm.

[0053] In this embodiment, in step 2, a porous copper ingot with a diameter of 18 mm is selected, and NbTi rods corresponding to the number of holes in the porous copper ingot are inserted into the holes of the porous copper ingot to obtain a NbTi / Cu composite ingot. Multi-pass drawing is performed, including: when the diameter of the NbTi / Cu composite ingot is greater than 10 mm, a pass processing rate of 5% to 10% is adopted; when the diameter of the NbTi / Cu composite ingot is greater than 1 mm and less than or equal to 10 mm, a pass processing rate of 20% to 30% is adopted; when the diameter of the NbTi / Cu composite ingot is less than or equal to 1 mm, a pass processing rate of 10% to 20% is adopted. Annealing and aging heat treatment are not performed during the multi-pass drawing process. After the multi-pass drawing, the uneven portions at the head and tail are sawed off to obtain a current transmission component with a diameter of 0.6 mm. Tinned copper wire with a diameter of 0.02 mm is used to weave the surface of the signal transmission component to obtain a braided signal transmission component, and the diameter of the braided current transmission component is 0.7 mm.

[0054] In this embodiment, in step three, a porous PTFE block is used as an integrated module. The pore diameter of the porous PTFE block is 0.3 mm larger than the diameter of the braided signal transmission component and the braided current transmission component. Several braided signal transmission components and several braided current transmission components are assembled into the pores of the porous PTFE block. The braided signal transmission components and the braided current transmission components are assembled adjacent to each other, that is, the braided signal transmission components and the braided current transmission components are arranged alternately. The assembled porous PTFE block is subjected to online hot rolling at a temperature of 180°C, a rolling speed of 25 m / min, and a processing rate of 3% to obtain an integrated superconducting cable.

[0055] After installation testing, in the integrated superconducting cable obtained in Example 2, the critical current of the current transmission component is 22A, and the measured signal attenuation value of the signal transmission component is 0.04dB / m, which meets the use requirements of superconducting quantum computers.

[0056] Example 3:

[0057] In this embodiment, in step 1, a 0.15 mm diameter NbTi wire is wrapped with a 0.03 mm thick PTFE tape for insulation, the number of wrappings is 3, and the overlap ratio is 90%. Then, online annealing and curing are performed at a temperature of 200°C and a speed of 10 m / min to obtain an insulated and cured NbTi wire with a diameter of 0.3 mm. Tinned copper wire with a diameter of 0.03 mm is braided on the surface of the insulated and cured NbTi wire. The braided insulated and cured NbTi wire has a diameter of 0.4 mm and is inserted into a NbTi capillary tube with an outer diameter of 0.7 mm and an inner diameter of 0.4 mm. The wire is stretched at a processing rate of 2% to obtain a signal transmission component. Tinned copper wire with a diameter of 0.03 mm is braided on the surface of the signal transmission component to obtain a braided signal transmission component with a diameter of 0.8 mm.

[0058] In this embodiment, in step 2, a porous copper ingot with a diameter of 20 mm is selected, and NbTi rods corresponding to the number of holes in the porous copper ingot are inserted into the holes of the porous copper ingot to obtain a NbTi / Cu composite ingot. Multi-pass drawing is performed, including: when the diameter of the NbTi / Cu composite ingot is greater than 10 mm, a pass processing rate of 5% to 10% is adopted; when the diameter of the NbTi / Cu composite ingot is greater than 1 mm and less than or equal to 10 mm, a pass processing rate of 20% to 30% is adopted; when the diameter of the NbTi / Cu composite ingot is less than or equal to 1 mm, a pass processing rate of 10% to 20% is adopted. Annealing and aging heat treatment are not performed during the multi-pass drawing process. After the multi-pass drawing, the uneven portions at the head and tail are sawed off to obtain a current transmission component with a diameter of 0.7 mm. Tinned copper wire with a diameter of 0.03 mm is used to weave the surface of the signal transmission component to obtain a braided signal transmission component, and the diameter of the braided current transmission component is 0.8 mm.

[0059] In this embodiment, in step three, a porous PTFE block is used as the integrated module. The pore diameter of the porous PTFE block is 0.5 mm larger than the diameter of the braided signal transmission component and the braided current transmission component. Several braided signal transmission components and several braided current transmission components are assembled into the pores of the porous PTFE block. The braided signal transmission components and the braided current transmission components are assembled adjacent to each other, that is, the braided signal transmission components and the braided current transmission components are arranged alternately. The assembled porous PTFE block is subjected to online hot rolling at a temperature of 200°C, a rolling speed of 20 m / min, and a processing rate of 5% to obtain an integrated superconducting cable.

[0060] After installation testing, in the integrated superconducting cable obtained in Example 3, the critical current of the current transmission component is 28A, and the measured signal attenuation value of the signal transmission component is 0.03dB / m, which meets the use requirements of superconducting quantum computers.

[0061] The embodiment of the present application realizes the integration of signal transmission and current transmission functions of superconducting cables for quantum computers by combining wrapping insulation, online annealing and curing, braiding, drawing, and assembly technologies, thereby saving space for dilution refrigerators.

[0062] By weaving tinned copper wire on the surface of the insulated solidified NbTi wire and then inserting it into the NbTi capillary, mutual interference of high-frequency signals in the inner conductor and outer conductor of the signal transmission component is avoided.

[0063] By weaving tinned copper wire on the surface of the signal transmission component and tinned copper wire on the surface of the current transmission component, after the integrated superconducting cable is assembled, the interference between different transmission components is suppressed and the stability of the integrated superconducting cable is improved.

[0064] After penetrating into the NbTi capillary, it is stretched at a processing rate of 1% to 2%, which plays a role in filling the pores.

[0065] It is proposed that when the diameter of the NbTi / Cu composite ingot is greater than 10 mm, a pass processing rate of 5% to 10% is used to reduce the gap between NbTi and Cu, laying the foundation for the subsequent coordinated deformation of multiple NbTi rods; when the diameter of the NbTi / Cu composite ingot is greater than 1 mm and less than or equal to 10 mm, a pass processing rate of 20% to 30% is used to concentrate the pressure transmission and promote coordinated deformation; when the diameter of the NbTi / Cu composite ingot is less than or equal to 1 mm, a pass processing rate of 10% to 20% is used to promote the shaping of the current transmission component and prevent the NbTi core from breaking due to excessive stress.

[0066] The proposed multi-pass drawing process does not require annealing and aging heat treatment. Annealing is not performed because the current transmission component mainly transmits current at the microampere level and has a small carrying current. There is no need for aging heat treatment to precipitate the α-Ti phase, thereby reducing process costs.

[0067] In the proposed steps 1 and 2, the diameter of the tinned copper wire used for braiding is 0.01-0.03 mm, which increases the braiding density and enhances the shielding effect.

[0068] The pore diameter of the proposed porous PTFE block is 0.2-0.5 mm larger than the diameter of the braided signal transmission component and the braided current transmission component, which facilitates the assembly of the components.

[0069] The proposed braided signal transmission component and the braided current transmission component are assembled adjacent to each other to prevent the same type of transmission components from interfering with each other.

[0070] The proposed online hot rolling of the assembled porous PTFE block reduces the gap inside the integrated superconducting cable.

[0071] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0072] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A method for preparing a novel integrated superconducting cable for a quantum computer, characterized in that: The following steps are involved: Step 1: Insulating a NbTi wire with a PTFE tape, and then annealing and curing the wire online to obtain an insulated and cured NbTi wire; braiding the surface of the insulated and cured NbTi wire with a tinned copper wire and inserting the wire into a NbTi capillary to obtain a signal transmission component; and braiding the surface of the signal transmission component with a tinned copper wire to obtain a braided signal transmission component; Step 2: Loading multiple NbTi rods into the holes of a porous copper ingot to obtain a NbTi / Cu composite ingot, performing multiple drawing passes, and sawing off the uneven parts at the head and tail to obtain a current transmission component. Tinned copper wire is used to weave the surface of the current transmission component to obtain a braided current transmission component. The braided current transmission component has the same specifications as the braided signal transmission component. Step three: using a porous PTFE block as an integrated module, assembling a plurality of the braided signal transmission components and a plurality of the braided current transmission components into the holes of the porous PTFE block to obtain an integrated superconducting cable.

2. The method for preparing a novel integrated superconducting cable for a quantum computer according to claim 1, characterized in that: In step one, the diameter of the NbTi wire is 0.1~0.2mm, the diameter of the insulating solidified NbTi wire is 0.2~0.3mm, the diameter of the insulating solidified NbTi wire after weaving is 0.3~0.4mm, the outer diameter of the NbTi capillary is 0.5~0.7mm, the inner diameter is 0.3~0.4mm, and the diameter of the braided signal transmission component is 0.6~0.8mm.

3. The method for preparing a novel integrated superconducting cable for a quantum computer according to claim 1, characterized in that: In step 1, the thickness of the PTFE tape is 0.01-0.03 mm, the number of times the insulation is wrapped is 2-3 times, and the overlap rate is 90%-95%.

4. The method for preparing a novel integrated superconducting cable for a quantum computer according to claim 1, characterized in that: In step 1, the temperature of the online annealing and curing is 150-200° C., and the speed is 10-20 m / min.

5. The method for preparing a novel integrated superconducting cable for a quantum computer according to claim 1, characterized in that: In step 1, after penetrating into the NbTi capillary, stretching is performed with a processing rate of 1% to 2%.

6. The method for preparing a novel integrated superconducting cable for a quantum computer according to claim 1, characterized in that: In step 2, the diameter of the porous copper ingot is 15-18 mm, the diameter of the current transmission component is 0.5-0.7 mm, and the diameter of the braided current transmission component is 0.6-0.8 mm.

7. The method for preparing a novel integrated superconducting cable for a quantum computer according to claim 1, characterized in that: In step 2, the multi-pass drawing includes: When the diameter of the NbTi / Cu composite ingot is greater than 10 mm, a pass processing rate of 5% to 10% is adopted; When the diameter of the NbTi / Cu composite ingot is greater than 1 mm and less than or equal to 10 mm, a pass processing rate of 20% to 30% is adopted; When the diameter of the NbTi / Cu composite ingot is less than or equal to 1 mm, a pass processing rate of 10% to 20% is adopted; Annealing and aging heat treatment are not performed during the multi-pass drawing process.

8. The method for preparing a novel integrated superconducting cable for a quantum computer according to claim 1, characterized in that: In step 1 and step 2, the diameter of the tinned copper wire used for braiding is 0.01~0.03mm.

9. The method for preparing a novel integrated superconducting cable for a quantum computer according to claim 1, characterized in that: In step 3, the pore diameter of the porous PTFE block is 0.2-0.5 mm larger than the diameter of the braided signal transmission component and the braided current transmission component; When assembling a plurality of the braided signal transmission components and a plurality of the braided current transmission components into the holes of the porous PTFE block, the braided signal transmission components and the braided current transmission components are assembled adjacent to each other, that is, the braided signal transmission components and the braided current transmission components are arranged alternately.

10. The method for preparing a novel integrated superconducting cable for a quantum computer according to claim 1, characterized in that: In step 3, the assembled porous PTFE block is subjected to online hot rolling; The online hot rolling temperature is 150-200° C., the rolling speed is 20-30 m / min, and the processing rate is 1%-5%.

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