Superconducting coaxial cable for quantum computer, and manufacturing method therefor

Abstract

The present invention relates to the technical field of cable manufacturing, and in particular relates to a superconducting coaxial cable for a quantum computer, and a manufacturing method therefor. The method comprises: wrapping an inner insulating layer on the outer side of an inner conductor to form an inner conductor layer, and electroplating a niobium compound coating on the inner wall of a stainless steel tube to form an outer conductor; forming a cable conductive layer; acquiring a travel speed change curve of a single inner conductor layer; determining a first speed abrupt change type and a second speed abrupt change type; determining a vertical stirring rate of an electroplating stirring rod at a position of the outer conductor; electroplating the inner wall of the stainless steel tube; determining, on the basis of the degree of friction between the inner conductor layer and the outer conductor, an inner conductor movement adjustment mode, comprising adjusting the moving speed of the inner conductor layer in the outer conductor, or determining an initial rotation rate of the inner conductor layer when drawing of the outer conductor starts; and performing drawing on the sleeved outer conductor to form a cable. The present invention improves the stability of cable assembly.

Description

A superconducting coaxial cable for quantum computers and its manufacturing method Technical Field

[0001] This invention relates to the field of cable manufacturing technology, and in particular to a superconducting coaxial cable for quantum computers and its manufacturing method. Background Technology

[0002] In existing technologies, quantum computers, as a new type of computing tool, possess computing power surpassing that of traditional computers. The core of superconducting coaxial cables is superconducting materials. Currently, commonly used superconducting materials include niobium-titanium, niobium-tritin, and yttrium barium copper oxide. Superconducting coaxial cables typically consist of an inner conductor, an insulation layer, and a shielding layer. The inner conductor is made of superconducting materials, and the shielding layer is used to isolate electromagnetic interference.

[0003] Chinese Patent Publication No. CN118155939A discloses a high-strength alloy wire, a drag chain cable, and a method for their preparation, comprising the following steps: (1) According to the mass fraction ratio, 5-8% silver, 3-4% nickel, 1-2% tin, 0.5-1% niobium, and the balance electrolytic copper raw materials are placed in a melting crucible and heated to 350-400℃ for 10-20 minutes. (2) The vacuum system is turned on to vacuum the sealed melting crucible until the vacuum degree is less than 2.0×10-3Pa, and then high-purity argon is introduced; the power is turned on again to heat to a temperature of 1280-1320℃ and held for 30-40 minutes, and then poured into a cylindrical casting mold and cooled to room temperature to obtain a copper alloy ingot. (3) The copper alloy ingot is rolled into a copper alloy rod using a continuous casting machine, drawn into a copper alloy wire using a wire drawing machine, and annealed to obtain a copper alloy wire. (4) The copper alloy wire is passed through a flux holding tank, a molten tin tank, a negative pressure chamber with a conical opening, and a cooling device using a traction mechanism, and then wound up to obtain a tin-plated copper alloy wire. It can be seen that the high-strength alloy wire, drag chain cable, and their preparation method described above have problems such as the outer conductor's weak mechanical properties and corrosion resistance leading to corrosion in extreme environments, resulting in decreased cable stability, and the uneven niobium oxide plating on the outer conductor after niobium plating leading to decreased stability during assembly. Summary of the Invention

[0004] Therefore, the present invention provides a superconducting coaxial cable for quantum computers and a method for manufacturing the same, in order to overcome the problems in the prior art where the outer conductor is corroded in extreme environments due to its weak mechanical and corrosion resistance, resulting in decreased cable stability, and the uneven niobium oxide coating on the outer conductor after niobium plating leads to decreased stability during assembly.

[0005] To achieve the above objectives, the present invention provides a method for manufacturing a superconducting coaxial cable for quantum computers, comprising:

[0006] An inner insulation layer is wrapped around the outside of the inner conductor to form an inner conductor layer, and a niobium oxide plating layer is electroplated on the inner wall of the stainless steel tube to form an outer conductor.

[0007] The socketing device, according to the set socketing motor speed, sockets a single inner conductor layer into a single outer conductor to form a cable conductive layer;

[0008] Obtain the velocity variation curve of a single inner conductor layer within a single outer conductor;

[0009] The first and second speed change types are determined based on the travel speed change curve.

[0010] The up-and-down stirring rate of the electroplating stirring rod at the location of the outer conductor where the first velocity mutation type occurs is determined.

[0011] The electroplating stirring rod is controlled to electroplat the inner wall of the stainless steel tube at the position of the outer conductor according to the up-and-down stirring rate;

[0012] The degree of friction between the inner conductor layer and the outer conductor is determined based on the duration of the second velocity mutation type.

[0013] The movement adjustment method of the inner conductor is determined based on the degree of friction between the inner conductor layer and the outer conductor, including adjusting the moving speed of the inner conductor layer within the outer conductor.

[0014] Alternatively, the initial rotational rate of the inner conductor layer at the start of wire drawing can be determined based on the rate change of the second rate change type;

[0015] The inner conductor layer is fitted inside the outer conductor according to the inner conductor movement adjustment method, and the outer conductor after fitting is pulled to cover the inner conductor layer to form a cable.

[0016] Further, based on the travel speed change curve, the first speed change type and the second speed change type are determined, including:

[0017] Obtain the abrupt speed on the travel speed change curve and the speed change range from the abrupt speed to the uniform speed;

[0018] If the time taken for the abrupt change in speed to the uniform speed is greater than a preset first time and less than a preset second time, then the speed change range is determined to be the first speed abrupt change type.

[0019] If the time taken for the abrupt change in speed to the uniform speed is less than or equal to the preset first time or greater than or equal to the preset second time, then the speed change range is determined to be the second speed abrupt change type.

[0020] Wherein, the mutation rate is the travel speed of the conductor layer that is not within the range of the rate change within a single outer conductor.

[0021] Further, determining the up-and-down stirring rate of the electroplating stirring rod at the location of the outer conductor where the first velocity mutation type occurs includes:

[0022] Obtain the first mutation rate of the first velocity mutation type;

[0023] Calculate the first velocity difference between the constant velocity and the first sudden velocity;

[0024] The up-and-down stirring rate of the electroplating stirring rod is increased according to the first speed difference;

[0025] The range of stirring positions for the electroplating stirring rod to stir at the up-and-down stirring rate is determined based on the position of the outer conductor that generates the abrupt change in speed.

[0026] Furthermore, the stirring position range is from the outer conductor position where the abrupt velocity change occurs to the outer conductor position at the end of the velocity change range of the first velocity abrupt type.

[0027] Furthermore, the up-and-down stirring rate of the electroplating stirring rod is positively correlated with the first speed difference.

[0028] Furthermore, adjusting the movement speed of the inner conductor layer within the outer conductor includes:

[0029] Obtain the duration of the second velocity mutation type;

[0030] If the duration is greater than or equal to the preset second duration, it is determined that the friction degree between the inner conductor layer and the outer conductor does not meet the requirements, and the vibration intensity of the outer conductor during the sleeve process is obtained;

[0031] Calculate the difference between the vibration intensity and the preset vibration intensity;

[0032] The movement speed of the inner conductor layer within the outer conductor is increased based on the vibration intensity difference.

[0033] Furthermore, the moving speed is positively correlated with the difference in vibration intensity.

[0034] Further, determining the initial rotational rate of the inner conductor layer when the outer conductor begins to be drawn includes:

[0035] If the duration is less than or equal to the preset first duration, it is determined that the uniformity of the gap between the inner conductor layer and the outer conductor does not meet the requirements, and the second mutation rate of the second velocity mutation type is obtained;

[0036] Calculate the difference between the constant velocity and the second abrupt velocity;

[0037] The initial rotational speed of the inner conductor layer is increased based on the second speed difference when the outer conductor begins to be drawn;

[0038] Wherein, the preset first duration is less than the preset second duration.

[0039] Furthermore, the initial rotational rate is positively correlated with the second speed difference.

[0040] This invention also provides a superconducting coaxial cable for quantum computers, wherein the superconducting coaxial cable comprises: an inner conductor material of niobium-titanium alloy, an outer conductor material of stainless steel tube with niobium oxide plating on the inner wall, and an inner insulation layer material of PTFE.

[0041] The stainless steel pipe has a wall thickness of 0.06 mm, and the niobium oxide coating has a thickness of 0.01 mm.

[0042] Compared with the prior art, the beneficial effects of the present invention are as follows: The method of the present invention determines the up-and-down stirring rate of the electroplating stirring rod or the moving speed and initial rotation speed of the inner conductor layer in the outer conductor by detecting the influence of the inner conductor layer sample on the electroplating layer during the assembly process with the outer conductor. Due to the unevenness of the plating layer during the electroplating process, the inner conductor layer may collide with the uneven protrusions of the plating layer during the sleeve process, or the inner conductor layer may rub against the electroplating layer due to the resonance between the sleeve equipment and the inner conductor layer. By determining the up-and-down stirring rate, the uniformity of the plating layer is increased. By determining the moving speed, the resonance effect between the sleeve equipment and the inner conductor layer is reduced. By determining the initial rotation speed, the stability of the outer conductor pulling process is reduced due to the filamentous niobium compounds scraped off by the inner conductor layer hooking onto the inner conductor layer and the outer conductor respectively. This improves the conductivity of the cable and increases production efficiency. At the same time, it can also effectively reduce the heat generated by the friction between the inner conductor layer and the outer conductor, thereby reducing the material performance degradation and material expansion caused by temperature rise. By controlling the splicing process between the inner conductor layer and the outer conductor, the stability of the cable and the stability of the assembly process between the inner conductor layer and the outer conductor are improved.

[0043] Furthermore, the method of the present invention improves the bonding stability between the inner conductor layer and the outer conductor by determining the type of velocity mutation and thus identifying bonding instability factors. If a first velocity mutation type is found, it indicates that the up-and-down stirring rate of the stirring rod may be uneven during the electroplating process. In this case, the motion parameters of the stirring rod are adjusted to ensure the uniformity of the plating layer. If a second velocity mutation type occurs, it indicates that the friction between the inner conductor layer and the outer conductor may be too high or too low. In this case, the bonding motion parameters are adjusted, thereby improving the detection accuracy.

[0044] Furthermore, the method of the present invention determines the stirring position of the electroplating stirring rod at which the up-and-down stirring rate needs to be adjusted. Due to the narrow and elongated characteristics of the inner wall space of the stainless steel tube, the uniformity of the electroplating process decreases, which in turn leads to an increase in the coating thickness at the uneven coating position. When the inner conductor layer collides with the thick coating position during the sleeve process, a sudden change in speed occurs. By increasing the up-and-down stirring rate of the stirring rod, the niobium element is made to fully contact the inner wall of the stainless steel tube, thereby increasing the coating uniformity and further increasing the sleeve stability.

[0045] Furthermore, the method of the present invention determines the factors that cause unstable connection by judging whether the friction degree between the inner conductor layer and the outer conductor meets the requirements. If the friction degree is too high, it may cause damage to the inner conductor layer or uneven plating, while if the friction degree is too low, it may mean that the gap between the inner conductor layer and the outer conductor is uneven, thereby improving the detection accuracy.

[0046] Furthermore, the method of the present invention adjusts the moving speed of the inner conductor layer within the outer conductor. Since one end of the inner conductor layer is connected to the socketing device, excessive distance between the inner conductor layer and the socketing device causes vibration of the socketing device, resulting in inconsistent resonance effects at different positions of the inner conductor layer. This leads to decreased stability at the end furthest from the socketing device, thereby increasing the scraping and friction effect of the inner conductor layer against the outer conductor during the socketing process. By increasing the moving speed of the inner conductor layer within the outer conductor, the resonance frequency of the inner conductor layer furthest from the socketing device is increased, thereby reducing friction during the socketing process and increasing the stability of the socketing.

[0047] Furthermore, the method of the present invention determines the initial rotational speed of the inner conductor layer at the start of pulling the outer conductor. Since the inner conductor layer scrapes against the niobium wires of the lower plating during the sleeve process, there are hooked niobium wires in the gap between the outer conductor and the inner conductor layer, resulting in uneven gaps and reducing the stability of the pulling process. By increasing the initial rotational speed, the hooking of niobium wires with the inner conductor layer and the outer conductor is reduced, thereby reducing the vibration caused by the hooking of niobium wires during pulling, and improving the mechanical strength and stability of the cable.

[0048] Furthermore, the method of this invention uses niobium-titanium alloy as the inner conductor, leveraging its excellent superconductivity and good mechanical strength to ensure stable cable operation in ultra-low temperature environments. The relatively high superconducting transition temperature of niobium-titanium alloy allows the cable to reach a superconducting state without requiring extremely low temperatures, thus improving the cable's operational stability. Simultaneously, the good ductility of niobium-titanium alloy enables it to withstand mechanical stresses that may occur during manufacturing and use, improving the cable's long-term stability. By selecting a stainless steel tube of a specific thickness as the outer conductor, the cable's mechanical and electromagnetic shielding properties are improved, increasing mechanical strength while reducing unnecessary weight increases, thus achieving cable lightweighting without compromising performance. Electroplating niobium compounds on the inner wall of the stainless steel tube increases the cable's conductivity and corrosion resistance. Using magnesium oxide as the inner insulation layer material, its excellent insulation properties and thermal stability improve the cable's operational safety in high-temperature environments. Magnesium oxide has a high melting point and good thermal conductivity, improving the uniformity of temperature distribution within the cable. Attached Figure Description

[0049] Figure 1 is an overall flowchart of the manufacturing method of superconducting coaxial cable for quantum computer according to an embodiment of the present invention;

[0050] Figure 2 is a flowchart of the process for determining the stirring rate of the electroplating stirring rod in the manufacturing method of the superconducting coaxial cable for quantum computer according to an embodiment of the present invention.

[0051] Figure 3 is a schematic diagram of the electroplating apparatus structure of the manufacturing method of superconducting coaxial cable for quantum computer according to an embodiment of the present invention;

[0052] Figure 4 is a schematic diagram of the structure of the superconducting coaxial cable for quantum computer according to an embodiment of the present invention;

[0053] Explanation of reference numerals: 1-Inner conductor, 2-Inner insulation layer, 3-Niobide plating, 4-Outer conductor, 5-Telescopic motor, 6-Telescopic rod, 7-Electroplating stirring rod, 8-Fixing frame, 9-Electroplating tank, 10-Stainless steel pipe. Detailed Implementation

[0054] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0055] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0056] It should be noted that in the description of this invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and is not intended to indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0057] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0058] Please refer to Figures 1, 2, 3, and 4, which are respectively an overall flowchart of the manufacturing method of a superconducting coaxial cable for a quantum computer, a flowchart of determining the stirring rate of the electroplating stirring rod, a schematic diagram of the electroplating device, and a schematic diagram of the structure of the superconducting coaxial cable for a quantum computer. An embodiment of the present invention provides a method for manufacturing a superconducting coaxial cable for a quantum computer, comprising:

[0059] An inner insulation layer is wrapped around the outside of the inner conductor to form an inner conductor layer, and a niobium oxide plating layer is electroplated on the inner wall of the stainless steel tube to form an outer conductor.

[0060] The socketing device, according to the set socketing motor speed, sockets a single inner conductor layer into a single outer conductor to form a cable conductive layer;

[0061] Obtain the velocity variation curve of a single inner conductor layer within a single outer conductor;

[0062] The first and second speed change types are determined based on the travel speed change curve.

[0063] The up-and-down stirring rate of the electroplating stirring rod at the location of the outer conductor where the first velocity mutation type occurs is determined.

[0064] The electroplating stirring rod is controlled to electroplat the inner wall of the stainless steel tube at the position of the outer conductor according to the up-and-down stirring rate;

[0065] The degree of friction between the inner conductor layer and the outer conductor is determined based on the duration of the second velocity mutation type.

[0066] The movement adjustment method of the inner conductor is determined based on the degree of friction between the inner conductor layer and the outer conductor, including adjusting the moving speed of the inner conductor layer within the outer conductor.

[0067] Alternatively, the initial rotational rate of the inner conductor layer at the start of wire drawing can be determined based on the rate change of the second rate change type;

[0068] The inner conductor layer is fitted inside the outer conductor according to the inner conductor movement adjustment method, and the outer conductor after fitting is pulled to cover the inner conductor layer to form a cable.

[0069] Specifically, the connecting device is a threading machine.

[0070] Specifically, the speed of change is obtained by an encoder on the threading machine. The encoder converts the linear displacement of the inner conductor into an electrical signal to read the speed of change. As those skilled in the art will understand, the process of obtaining the speed of change through an encoder is a conventional technical means known to them. Therefore, the specific process of obtaining the speed of change through an encoder will not be described in detail here.

[0071] Specifically, during the electroplating process, the surface of the stainless steel tube 10, except for the inner wall, needs to be coated with silicone resin insulating varnish. The stainless steel tube 10 and the niobium rod serve as the positive and negative electrodes for electroplating. The stainless steel tube 10 is vertically placed in the electrolyte, and the electroplating stirring rod moves vertically inside the stainless steel tube.

[0072] Specifically, electroplating equipment includes:

[0073] Electroplating tank 9 is used to hold the electrolyte;

[0074] Fixing bracket 8 is used to vertically fix the stainless steel tube in the electrolyte;

[0075] The electroplating stirring rod 7 is vertically positioned in the middle of the fixed device to stir the electrolyte;

[0076] Telescopic rod 6, which is connected to electroplating stirring rod, is used to drive the electroplating stirring rod to move in the vertical direction;

[0077] Telescopic motor 5 is connected to the telescopic rod and is used to control the movement of the telescopic rod.

[0078] Specifically, the diameter of the electroplating stirring rod is smaller than the inner diameter of the stainless steel tube, and the length of the electroplating stirring rod is smaller than the length of the stainless steel tube.

[0079] Specifically, after the threading machine drives the inner conductor layer through the outer conductor, a clamp is connected to the part of the inner conductor layer that extends beyond the outer conductor to fix the inner conductor layer. The clamp is connected to a rotary motor that drives the clamp to rotate and thus drives the inner conductor layer to rotate when pulling the wire through the outer conductor.

[0080] Specifically, the inner insulation layer 2 is wrapped around the outside of the inner conductor 1 by a wrapping machine.

[0081] Optionally, the general range of the uniform velocity in the detection is [0.5m / s, 1m / s].

[0082] Preferably, the preferred embodiment of the uniform speed is 0.8 m / s.

[0083] In practice, the method of this invention determines the up-and-down stirring rate of the electroplating stirring rod or the moving speed and initial rotation speed of the inner conductor layer within the outer conductor by detecting the influence of the inner conductor layer sample on the electroplating layer during assembly with the outer conductor. Since uneven plating during electroplating causes the inner conductor layer to collide with uneven plating protrusions during the socketing process, or due to resonance between the socketing equipment and the inner conductor layer causing scraping against the electroplating layer, determining the up-and-down stirring rate increases plating uniformity. Determining the moving speed reduces the resonance effect between the socketing equipment and the inner conductor layer. Determining the initial rotation speed reduces the instability of the outer conductor pulling process caused by the filamentous niobium compounds scraped off by the inner conductor layer hooking onto both the inner and outer conductors. This improves the cable's conductivity and increases production efficiency. Simultaneously, it effectively reduces the heat generated by friction between the inner and outer conductors, thereby reducing material performance degradation and material expansion caused by temperature increases. By controlling the splicing process between the inner conductor layer and the outer conductor, the stability of the cable and the stability of the assembly process between the inner conductor layer and the outer conductor are improved.

[0084] Specifically, determining the first speed change type and the second speed change type based on the travel speed change curve includes:

[0085] Obtain the abrupt speed on the travel speed change curve and the speed change range from the abrupt speed to the uniform speed;

[0086] If the time taken for the abrupt change in speed to the uniform speed is greater than a preset first time and less than a preset second time, then the speed change range is determined to be the first speed abrupt change type.

[0087] If the time taken for the abrupt change in speed to the uniform speed is less than or equal to the preset first time or greater than or equal to the preset second time, then the speed change range is determined to be the second speed abrupt change type.

[0088] Wherein, the sudden change speed is the travel speed of the conductor layer inside a single outer conductor in the travel speed change curve that is less than the uniform speed and whose difference from the uniform speed is greater than or equal to a preset sudden change difference.

[0089] Specifically, the general range of the preset mutation difference is [0.15m / s, 2m / s].

[0090] Preferably, the preferred embodiment of the preset mutation difference value is 0.18 m / s.

[0091] Specifically, the speed change characteristics of the first type of speed change are that within the speed change range, the speed changes from uniform speed to speed change and then increases from speed change to uniform speed. The speed change characteristics of the second type of speed change are that within the speed change range, the speed changes from uniform speed to speed change and then increases from speed change to uniform speed rapidly, or the speed changes from uniform speed to speed change and then increases from speed change to uniform speed slowly.

[0092] Specifically, the preset first duration is generally within the range of [0.4s, 1s], and the preset second duration is generally within the range of [1.4s, 1.8s].

[0093] Preferably, the first preset duration is 0.5s, and the second preset duration is 1.5s.

[0094] In practice, by determining the type of speed mutation, the factors causing instability in the connection are identified, thereby improving the connection stability between the inner conductor layer and the outer conductor 4. If the first type of speed mutation is found, it indicates that the up-and-down stirring rate of the stirring rod may be uneven during the electroplating process. In this case, the motion parameters of the stirring rod are adjusted to ensure the uniformity of the plating layer. If the second type of speed mutation occurs, it indicates that the friction between the inner conductor layer and the outer conductor 4 may be too high or too low. In this case, the connection motion parameters are adjusted, thereby improving the detection accuracy.

[0095] Specifically, determining the up-and-down stirring rate of the electroplating stirring rod at the location of the outer conductor where the first velocity mutation type occurs includes:

[0096] Obtain the first mutation rate of the first velocity mutation type;

[0097] Calculate the first velocity difference between the constant velocity and the first sudden velocity;

[0098] The up-and-down stirring rate of the electroplating stirring rod is increased according to the first speed difference;

[0099] The range of stirring positions for the electroplating stirring rod to stir at the up-and-down stirring rate is determined based on the position of the outer conductor that generates the abrupt change in speed.

[0100] Specifically, the stirring position range is from the outer conductor position where the abrupt velocity change occurs to the outer conductor position at the end of the velocity change range of the first velocity abrupt type.

[0101] Specifically, the up-and-down stirring rate is the same as the extension and retraction rate of the telescopic rod.

[0102] Specifically, the up-and-down stirring rate of the electroplating stirring rod is positively correlated with the first speed difference.

[0103] Specifically, when the first speed difference increases by less than 0.1 m / s, the up-and-down stirring rate of the electroplating stirring rod increases by 0.1 m / s. If the first speed difference exceeds 0.1 m / s, the up-and-down stirring rate of the electroplating stirring rod increases by 0.1 m / s for every 0.1 m / s increase. For example, if the sudden change in speed is 0.6 m / s and the current up-and-down stirring rate of the electroplating stirring rod is 0.5 m / s, then the up-and-down stirring rate of the electroplating stirring rod increases to 0.5 m / s + 0.1 m / s + 0.1 m / s = 0.7 m / s.

[0104] In practice, the method of the present invention determines the stirring position of the electroplating stirring rod to adjust the up and down stirring rate. Due to the narrow and long characteristics of the inner wall space of the stainless steel tube, the uniformity of the electroplating process decreases, which leads to an increase in the coating thickness at the uneven coating position. When the inner conductor layer collides with the thick coating position during the sleeve process, a sudden change in speed occurs. By increasing the up and down stirring rate of the stirring rod, the niobium element is made to fully contact the inner wall of the stainless steel tube, thereby increasing the coating uniformity and further increasing the sleeve stability.

[0105] Specifically, adjusting the movement speed of the inner conductor layer within the outer conductor includes:

[0106] Obtain the duration of the second velocity mutation type;

[0107] If the duration is greater than or equal to the preset second duration, it is determined that the friction degree between the inner conductor layer and the outer conductor does not meet the requirements, and the vibration intensity of the outer conductor during the sleeve process is obtained;

[0108] Calculate the difference between the vibration intensity and the preset vibration intensity;

[0109] The movement speed of the inner conductor layer within the outer conductor is increased based on the vibration intensity difference.

[0110] In practice, the method of the present invention determines the factors that cause unstable connection by judging whether the friction degree between the inner conductor layer and the outer conductor 4 meets the requirements. If the friction degree is too high, it may cause damage to the inner conductor layer or uneven plating, while if the friction degree is too low, it may mean that the gap between the inner conductor layer and the outer conductor 4 is uneven, thereby improving the detection accuracy.

[0111] Specifically, the moving speed is positively correlated with the difference in vibration intensity.

[0112] Specifically, the vibration intensity of the outer conductor 4 is detected by a vibration sensor connected to the wall of the outer conductor 4.

[0113] Specifically, the preset vibration intensity is generally set within the range of [1 mm / s², 1.4 mm / s²].

[0114] Preferably, the preset vibration intensity is 1.2 mm / s².

[0115] In practice, when the difference between the vibration intensity and the preset vibration intensity is within 0.1 mm / s², the moving speed of the inner conductor layer within the outer conductor 4 increases to 1.2 times the original value. When the difference between the vibration intensity and the preset vibration intensity exceeds 0.1 mm / s², the moving speed of the inner conductor layer within the outer conductor 4 increases by 0.1 m / s for every 0.1 mm / s² difference. For example, if the vibration intensity of the outer conductor 4 is 1.4 mm / s², the moving speed of the inner conductor layer within the outer conductor 4 increases to 0.8 m / s × 1.2 + 0.1 m / s = 1.06 m / s.

[0116] In practice, the method of the present invention adjusts the moving speed of the inner conductor layer within the outer conductor. Since one end of the inner conductor layer is connected to the socketing device, excessive distance between the inner conductor layer and the socketing device causes vibration of the socketing device, resulting in inconsistent resonance effects at different positions of the inner conductor layer. This leads to decreased stability at the end furthest from the socketing device, which in turn increases the scraping and friction effect of the inner conductor layer against the outer conductor during the socketing process. By increasing the moving speed of the inner conductor layer within the outer conductor, the resonance frequency of the inner conductor layer furthest from the socketing device is increased, thereby reducing friction during the socketing process and increasing the stability of the socketing.

[0117] Specifically, determining the initial rotational speed of the inner conductor layer when the outer conductor begins to be drawn includes:

[0118] If the duration is less than or equal to the preset first duration, it is determined that the uniformity of the gap between the inner conductor layer and the outer conductor does not meet the requirements, and the second mutation rate of the second velocity mutation type is obtained;

[0119] Calculate the difference between the constant velocity and the second abrupt velocity;

[0120] The initial rotational speed of the inner conductor layer is increased based on the second speed difference when the outer conductor begins to be drawn;

[0121] Wherein, the preset first duration is less than the preset second duration.

[0122] Specifically, the equipment used to pull the wires of the external conductor is a tracked wire pulling machine.

[0123] Specifically, the initial rotational rate is positively correlated with the second velocity difference.

[0124] Specifically, when the second velocity difference increases by less than 0.1 m / s, the initial rotational speed of the inner conductor layer increases by 8 rpm. If the second velocity difference exceeds 0.1 m / s, the initial rotational speed of the inner conductor layer increases by 5 rpm for every 0.1 m / s increase. For example, if the sudden velocity change is 0.6 m / s and the current initial rotational speed of the inner conductor layer is 15 rpm, then the initial rotational speed of the inner conductor layer increases to 15 rpm + 8 rpm + 5 rpm = 28 rpm.

[0125] In practice, the method of the present invention determines the initial rotational speed of the inner conductor layer at the start of pulling the outer conductor. Because the inner conductor layer scrapes against the niobium wires of the lower plating during the sleeve process, there are hooked niobium wires in the gap between the outer conductor and the inner conductor layer, resulting in uneven gaps and reducing the stability of the pulling process. By increasing the initial rotational speed, the hooking of niobium wires with the inner conductor layer and the outer conductor is reduced, thereby reducing the vibration caused by the hooking of niobium wires during pulling, and improving the mechanical strength and stability of the cable.

[0126] This invention also provides a superconducting coaxial cable for quantum computers, comprising: the superconducting coaxial cable is composed of: an inner conductor 1 made of niobium-titanium alloy, an outer conductor 4 made of stainless steel tubing with an inner wall coated with niobium oxide, and an inner insulation layer 2 made of PTFE.

[0127] The stainless steel pipe has a wall thickness of 0.06 mm, and the niobium oxide coating 3 has a thickness of 0.01 mm.

[0128] In practice, the method of this invention uses niobium-titanium alloy as the inner conductor 1, utilizing its excellent superconducting properties and good mechanical strength to ensure stable operation of the cable in ultra-low temperature environments. The relatively high superconducting transition temperature of niobium-titanium alloy allows the cable to reach a superconducting state without requiring extremely low temperatures, thus improving the stability of cable operation. Simultaneously, the good ductility of niobium-titanium alloy enables it to withstand mechanical stresses that may occur during manufacturing and use, improving the long-term stability of the cable. By selecting a stainless steel tube of a specific thickness as the outer conductor 4, the mechanical and electromagnetic shielding properties of the cable are improved, increasing mechanical strength while reducing unnecessary weight increases, thus achieving cable lightweighting without affecting cable performance. Electroplating niobium compounds on the inner wall of the stainless steel tube increases the cable's conductivity and corrosion resistance. Using magnesium oxide as the inner insulation layer 2 material, its excellent insulation properties and thermal stability improve the cable's operational safety in high-temperature environments. Magnesium oxide has a high melting point and good thermal conductivity, improving the uniformity of temperature distribution within the cable.

[0129] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for manufacturing a superconducting coaxial cable for quantum computers, characterized in that, include: An inner insulation layer is wrapped around the outside of the inner conductor to form an inner conductor layer, and a niobium oxide plating layer is electroplated on the inner wall of the stainless steel tube to form an outer conductor. The socketing device, according to the set socketing motor speed, sockets a single inner conductor layer into a single outer conductor to form a cable conductive layer; Obtain the velocity variation curve of a single inner conductor layer within a single outer conductor; The first and second speed change types are determined based on the travel speed change curve. The up-and-down stirring rate of the electroplating stirring rod at the location of the outer conductor where the first velocity mutation type occurs is determined. The electroplating stirring rod is controlled to electroplat the inner wall of the stainless steel tube at the position of the outer conductor according to the up-and-down stirring rate; The degree of friction between the inner conductor layer and the outer conductor is determined based on the duration of the second velocity mutation type. The movement adjustment method of the inner conductor is determined based on the degree of friction between the inner conductor layer and the outer conductor, including adjusting the moving speed of the inner conductor layer within the outer conductor. Alternatively, the initial rotational rate of the inner conductor layer at the start of wire drawing can be determined based on the rate change of the second rate change type; The inner conductor layer is fitted inside the outer conductor according to the inner conductor movement adjustment method, and the outer conductor after fitting is pulled to make the outer conductor cover the inner conductor layer to form a cable; The determination of the first velocity change type and the second velocity change type based on the travel speed change curve includes: Obtain the abrupt speed on the travel speed change curve and the speed change range from the abrupt speed to the uniform speed; If the time taken for the abrupt change in speed to the uniform speed is greater than a preset first time and less than a preset second time, then the speed change range is determined to be the first speed abrupt change type. If the time taken for the abrupt change in speed to the uniform speed is less than or equal to the preset first time or greater than or equal to the preset second time, then the speed change range is determined to be the second speed abrupt change type. Wherein, the sudden change speed is the travel speed of the conductor layer inside a single outer conductor in the travel speed change curve that is less than the uniform speed and whose difference from the uniform speed is greater than or equal to a preset sudden change difference.

2. The method for manufacturing a superconducting coaxial cable for a quantum computer according to claim 1, characterized in that, Determining the up-and-down stirring rate of the electroplating stirring rod at the location of the outer conductor where the first velocity mutation type occurs includes: Obtain the first mutation rate of the first velocity mutation type; Calculate the first velocity difference between the constant velocity and the first sudden velocity; The up-and-down stirring rate of the electroplating stirring rod is increased according to the first speed difference; The range of stirring positions for the electroplating stirring rod to stir at the up-and-down stirring rate is determined based on the position of the outer conductor that generates the abrupt change in speed.

3. The method for manufacturing a superconducting coaxial cable for a quantum computer according to claim 2, characterized in that, The stirring position range is from the outer conductor position where the abrupt change in speed occurs to the outer conductor position at the end of the speed change range of the first speed abrupt change type.

4. The method for manufacturing a superconducting coaxial cable for a quantum computer according to claim 3, characterized in that, The up-and-down stirring rate of the electroplating stirring rod is positively correlated with the first speed difference.

5. The method for manufacturing a superconducting coaxial cable for a quantum computer according to claim 4, characterized in that, Adjusting the movement speed of the inner conductor layer within the outer conductor includes: Obtain the duration of the second velocity mutation type; If the duration is greater than or equal to the preset second duration, it is determined that the friction degree between the inner conductor layer and the outer conductor does not meet the requirements, and the vibration intensity of the outer conductor during the sleeve process is obtained; Calculate the difference between the vibration intensity and the preset vibration intensity; The movement speed of the inner conductor layer within the outer conductor is increased based on the vibration intensity difference.

6. The method for manufacturing a superconducting coaxial cable for a quantum computer according to claim 5, characterized in that, The moving speed is positively correlated with the difference in vibration intensity.

7. The method for manufacturing a superconducting coaxial cable for a quantum computer according to claim 6, characterized in that, Determining the initial rotational speed of the inner conductor layer when the outer conductor begins to be drawn includes: If the duration is less than or equal to the preset first duration, it is determined that the uniformity of the gap between the inner conductor layer and the outer conductor does not meet the requirements, and the second mutation rate of the second velocity mutation type is obtained; Calculate the difference between the constant velocity and the second abrupt velocity; The initial rotational speed of the inner conductor layer is increased based on the second speed difference when the outer conductor begins to be drawn; Wherein, the preset first duration is less than the preset second duration.

8. The method for manufacturing a superconducting coaxial cable for a quantum computer according to claim 7, characterized in that, The initial rotational rate is positively correlated with the second velocity difference.

9. A superconducting coaxial cable manufactured using the method for manufacturing a superconducting coaxial cable for a quantum computer as described in any one of claims 1-8, characterized in that, The superconducting coaxial cable is composed of the following materials: an inner conductor of niobium-titanium alloy, an outer conductor of stainless steel tubing with an inner niobium oxide coating, and an inner insulation layer of PTFE. The stainless steel pipe has a wall thickness of 0.06 mm, and the niobium oxide coating has a thickness of 0.01 mm.

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