A superconducting coaxial cable for quantum computer and a manufacturing method thereof

Abstract

The present invention relates to the technical field of cable manufacturing, and in particular to a superconducting coaxial cable for quantum computers and a manufacturing method thereof, the method comprising: coating an inner insulating layer on the outer side of an inner conductor to form an inner conductor layer, electroplating a niobium coating layer on the inner wall of a stainless steel tube to form an outer conductor; forming a cable conductive layer; obtaining a single inner conductor layer travel speed change curve; determining a first speed mutation type and a second speed mutation type; determining the up and down stirring rate of an electroplating stirring rod at the outer conductor position; electroplating the inner wall of the stainless steel tube; determining an inner conductor movement adjustment mode according to the degree of friction between the inner conductor layer and the outer conductor, including adjusting the moving speed of the inner conductor layer in the outer conductor, or determining the initial rotation rate of the inner conductor layer when the outer conductor starts to pull the wire; pulling the outer conductor after sleeve connection to form a cable. The present invention achieves an increase in the stability of cable assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of cable manufacturing, and in particular to a superconducting coaxial cable for a quantum computer and a manufacturing method thereof. Background Art

[0002] In the existing technology, quantum computers, as a new type of computing tool, have computing power that exceeds that of traditional computers. The core of superconducting coaxial cables is superconducting materials. At present, commonly used superconducting materials include niobium titanium, niobium tin and yttrium barium copper oxide. Superconducting coaxial cables are usually composed of inner conductors, insulating layers and shielding layers. The inner conductor is made of superconducting materials, and the shielding layer is used to isolate electromagnetic interference.

[0003] Chinese patent publication number: CN118155939A discloses a high-strength alloy conductor, drag chain cable and its preparation method, 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 remaining electrolytic copper raw materials are placed in a melting crucible, heated to 350-400°C and preheated for 10-20 minutes. (2) The vacuum system is turned on to vacuum the closed melting crucible until the vacuum degree is less than 2.0×10-3Pa, and then high-purity argon gas is introduced; the power is turned on again to heat to a temperature of 1280-1320°C and keep warm 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 by a continuous casting machine, drawn into a copper alloy wire by a wire drawing machine, and annealed to obtain a copper alloy conductor. (4) The copper alloy wire is passed through a flux tank, a molten tin tank, a negative pressure chamber with a conical opening, a cooling device, and a winding mechanism by a traction mechanism to obtain a tinned copper alloy wire. It can be seen that the high-strength alloy wire, the drag chain cable, and the preparation method thereof have the problem that the outer conductor is corroded in extreme environments due to its weak mechanical properties and corrosion resistance, thereby reducing the stability of the cable, and the niobium coating of the outer conductor is uneven after niobium plating, which reduces the stability of the assembly process. Summary of the invention

[0004] To this end, the present invention provides a superconducting coaxial cable for a quantum computer and a manufacturing method thereof, so as to overcome the problems in the prior art that the outer conductor is corroded in extreme environments due to its weak mechanical properties and corrosion resistance, thereby causing the cable stability to decrease, and the stability of the assembly process is decreased due to the uneven niobium coating of the outer conductor after niobium plating.

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

[0006] An inner insulating layer is coated on the outer side of the inner conductor to form an inner conductor layer, and a niobium coating layer is electroplated on the inner wall of the stainless steel tube to form an outer conductor;

[0007] The sleeve device sleeves a single inner conductor layer into a single outer conductor according to a set sleeve motor speed to form a cable conductive layer;

[0008] Obtaining a travel speed variation curve of a single inner conductor layer inside a single outer conductor;

[0009] Determining a first speed mutation type and a second speed mutation type according to the travel speed change curve;

[0010] Determining the upper and lower stirring rates of the electroplating stirring rod at the outer conductor position according to the outer conductor position generating the first speed mutation type;

[0011] Control the electroplating stirring rod to electroplate the inner wall of the stainless steel tube at the outer conductor position according to the up and down stirring rate;

[0012] Determining the degree of friction between the inner conductor layer and the outer conductor according to the duration of the second speed mutation type;

[0013] The inner conductor movement adjustment mode is determined according to the friction degree between the inner conductor layer and the outer conductor, including adjusting the moving speed of the inner conductor layer in the outer conductor,

[0014] or, determining the initial rotation rate of the inner conductor layer when the outer conductor starts pulling the wire according to the speed change amount of the second speed mutation type;

[0015] The inner conductor layer is sleeved inside the outer conductor according to the inner conductor movement adjustment method, and the sleeved outer conductor is pulled so that the outer conductor is covered on the inner conductor layer to form a cable.

[0016] Further, determining the first speed mutation type and the second speed mutation type according to the travel speed change curve includes:

[0017] Obtaining a sudden change speed on the traveling speed change curve and a speed change range from the sudden change speed to a uniform speed;

[0018] If the time taken for the sudden change of the speed to the uniform speed is greater than the preset first time and less than the preset second time, the speed change range is determined to be the first speed sudden change type;

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

[0020] The sudden change speed is the travel speed of the conductor layer that does not belong to the speed variation range inside the single outer conductor.

[0021] Further, according to the outer conductor position generating the first speed mutation type, determining the upper and lower stirring rates of the electroplating stirring rod at the outer conductor position includes:

[0022] Obtaining a first mutation speed of the first speed mutation type;

[0023] Calculate a first speed difference between the uniform speed and the first sudden speed;

[0024] increasing the up and down stirring speed of the electroplating stirring rod according to the first speed difference;

[0025] The stirring position range of the electroplating stirring rod for stirring at the up and down stirring rates is determined according to the position of the outer conductor that produces the sudden speed.

[0026] Furthermore, the stirring position range is from the outer conductor position where the sudden speed is generated to the outer conductor position where the speed change range of the first speed sudden change type ends.

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

[0028] Further, adjusting the moving speed of the inner conductor layer in the outer conductor includes:

[0029] Obtaining the duration of the second speed 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 requirement, and the vibration intensity of the outer conductor during the sleeve connection process is obtained;

[0031] Calculating a vibration intensity difference between the vibration intensity and a preset vibration intensity;

[0032] The moving speed of the inner conductor layer within the outer conductor is increased according to the vibration intensity difference.

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

[0034] Further, the determining of the initial rotation rate of the inner conductor layer when the outer conductor starts to pull the wire comprises:

[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 requirement, and a second mutation speed of the second speed mutation type is obtained;

[0036] Calculate a second speed difference between the uniform speed and the second sudden speed;

[0037] increasing the initial rotation speed of the inner conductor layer when the outer conductor starts pulling the wire according to the second speed difference;

[0038] The preset first duration is shorter than the preset second duration.

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

[0040] The present invention also provides a superconducting coaxial cable for a quantum computer. The superconducting coaxial cable comprises: an inner conductor material of niobium-titanium alloy, an outer conductor material of a stainless steel tube with a niobide coating on the inner wall, and an inner insulating layer material of PTFE.

[0041] Wherein, the wall thickness of the stainless steel tube is 0.06 mm, and the thickness of the niobium coating is 0.01 mm.

[0042] Compared with the prior art, the beneficial effect of the present invention lies in that the method of the present invention determines the up and down stirring rate of the electroplating stirring rod or determines the moving speed and initial rotation rate 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 uneven plating during the electroplating process, the inner conductor layer collides with the protruding part of the uneven plating during the sleeve connection process, or the inner conductor layer scratches the electroplating layer due to the resonance between the sleeve connection device and the inner conductor layer. By determining the up and down stirring rate, the uniformity of the plating is increased, and by determining the moving speed, the resonance influence of the sleeve connection device and the inner conductor layer is reduced. By determining the initial rotation rate, the stability of the outer conductor wire drawing process caused by the filamentous niobium scraped off the inner conductor layer and hooking with the inner conductor layer and the outer conductor respectively is reduced, thereby improving the conductive performance of the cable and increasing the 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 the temperature increase. By controlling the sleeve connection process of the inner conductor layer and the outer conductor, the stability of the cable and the stability of the assembly process of the inner conductor layer and the outer conductor are improved.

[0043] Furthermore, the method of the present invention determines the type of speed mutation and then determines the unstable factor of the sleeve connection to improve the sleeve connection stability of the inner conductor layer and the outer conductor; if the first speed mutation type is found, it indicates that the up and down stirring rate of the stirring rod may be uneven during the electroplating process, and the motion parameters of the stirring rod are adjusted to ensure the uniformity of the coating; if the second speed mutation type occurs, it indicates that the degree of friction between the inner conductor layer and the outer conductor may be too high or too low, and the sleeve connection motion parameters are adjusted to improve the detection accuracy.

[0044] Furthermore, the method of the present invention determines the stirring position of the electroplating stirring rod that needs to adjust the upper and lower stirring rates. Due to the narrow and long characteristics of the inner wall space of the stainless steel tube, the uniformity during the electroplating process decreases, which leads to an increase in the thickness of the coating at the position where the coating is uneven. When the inner conductor layer collides with the thick coating position during the socketing process, a sudden change in speed occurs. By increasing the upper and lower stirring rates of the stirring rod, the niobium element is fully in contact with the inner wall of the stainless steel tube, thereby achieving an increase in the uniformity of the coating and further achieving an increase in the socketing stability.

[0045] Furthermore, the method of the present invention determines whether the degree of friction between the inner conductor layer and the outer conductor meets the requirements and then determines the factors causing the unstable socket. If the degree of friction is too high, it may cause damage to the inner conductor layer or uneven coating, while if the degree of friction 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 in the outer conductor. Since one end of the inner conductor layer is connected to the sleeve device, the distance between the inner conductor layer and the sleeve device is too far, which causes the sleeve device to vibrate and cause the resonance effects of various positions of the inner conductor layer to be inconsistent, resulting in a decrease in stability away from the end of the sleeve device, which in turn causes an increase in the scratching and friction effect of the inner conductor layer on the outer conductor during the sleeve process. By increasing the moving speed of the inner conductor layer in the outer conductor and increasing the resonance frequency of the inner conductor layer away from one end of the sleeve device, the friction during the sleeve process is reduced, thereby achieving an increase in the sleeve stability.

[0047] Furthermore, the method of the present invention determines the initial rotation rate of the inner conductor layer when the outer conductor begins to be pulled. Since the inner conductor layer scrapes the niobium wire of the lower coating during the sleeve connection process, there are connected niobium wires in the gap between the outer conductor and the inner conductor layer, resulting in uneven gaps, thereby reducing the stability of the wire drawing process. By increasing the initial rotation rate, the connection between the niobium wire and the inner conductor layer and the outer conductor is reduced, thereby reducing the vibration generated during wire drawing due to the connection of the niobium wire, thereby achieving improved mechanical strength and enhanced stability of the cable.

[0048] Furthermore, the method of the present invention ensures the stable operation of the cable in an ultra-low temperature environment by using niobium-titanium alloy as an inner conductor and utilizing its excellent superconducting properties and good mechanical strength. The superconducting transition temperature of niobium-titanium alloy is relatively high, so that the cable can reach a superconducting state without the need for extremely low temperatures, thereby improving the stability of the cable operation. At the same time, niobium-titanium alloy has good ductility and can withstand mechanical stress that may occur during manufacturing and use, thereby achieving improved long-term stability of the cable. By selecting a stainless steel tube of a specific thickness as an outer conductor, the mechanical properties and electromagnetic shielding properties of the cable are improved, which not only improves the mechanical strength but also reduces unnecessary weight increase, thereby achieving lightweight cables without affecting the performance of the cable. By electroplating niobium on the inner wall of the stainless steel tube, the electrical conductivity and corrosion resistance of the cable are increased. By using magnesium oxide as the inner insulating layer material and utilizing its good insulating properties and thermal stability, the operating safety of the cable in a high temperature environment is improved. Magnesium oxide has a high melting point and good thermal conductivity, thereby achieving improved uniformity of temperature distribution inside the cable. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0050] Figure 2 A flow chart of determining the upper and lower stirring rates of an electroplated stirring rod in a method for manufacturing a superconducting coaxial cable for a quantum computer according to an embodiment of the present invention;

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

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

[0053] Explanation of the accompanying drawings: 1-inner conductor, 2-inner insulating layer, 3-niobium coating, 4-outer conductor, 5-telescopic motor, 6-telescopic rod, 7-electroplating stirring rod, 8-fixed frame, 9-electroplating tank, 10-stainless steel tube. DETAILED DESCRIPTION

[0054] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0055] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0056] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0057] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] See also Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, they are respectively an overall flow chart of the manufacturing method of the superconducting coaxial cable for quantum computers of the embodiment, a flow chart for determining the upper and lower stirring rates of the electroplating stirring rod, a schematic diagram of the structure of the electroplating device, and a schematic diagram of the structure of the superconducting coaxial cable for quantum computers of the embodiment. A method for manufacturing a superconducting coaxial cable for quantum computers of the embodiment of the present invention comprises:

[0059] An inner insulating layer is coated on the outer side of the inner conductor to form an inner conductor layer, and a niobium coating layer is electroplated on the inner wall of the stainless steel tube to form an outer conductor;

[0060] The sleeve device sleeves a single inner conductor layer into a single outer conductor according to a set sleeve motor speed to form a cable conductive layer;

[0061] Obtaining a travel speed variation curve of a single inner conductor layer inside a single outer conductor;

[0062] Determining a first speed mutation type and a second speed mutation type according to the travel speed change curve;

[0063] Determining the upper and lower stirring rates of the electroplating stirring rod at the outer conductor position according to the outer conductor position generating the first speed mutation type;

[0064] Control the electroplating stirring rod to electroplate the inner wall of the stainless steel tube at the outer conductor position according to the up and down stirring rate;

[0065] Determining the degree of friction between the inner conductor layer and the outer conductor according to the duration of the second speed mutation type;

[0066] The inner conductor movement adjustment mode is determined according to the friction degree between the inner conductor layer and the outer conductor, including adjusting the moving speed of the inner conductor layer in the outer conductor,

[0067] or, determining the initial rotation rate of the inner conductor layer when the outer conductor starts pulling the wire according to the speed change amount of the second speed mutation type;

[0068] The inner conductor layer is sleeved inside the outer conductor according to the inner conductor movement adjustment method, and the sleeved outer conductor is pulled so that the outer conductor is covered on the inner conductor layer to form a cable.

[0069] Specifically, the sleeve connection device is a stringing machine.

[0070] Specifically, the mutation speed is obtained through the encoder on the threading machine. The encoder converts the linear displacement of the inner conductor into an electrical signal to read the mutation speed. Those skilled in the art can understand that the process of obtaining the mutation speed through the encoder is a conventional technical means well known to those skilled in the art. Therefore, the specific process of obtaining the mutation speed through the encoder will not be repeated here.

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

[0072] Specifically, electroplating equipment includes:

[0073] The electroplating tank 9 is used to carry the electrolyte;

[0074] A fixing frame 8, used to fix the stainless steel tube vertically in the electrolyte;

[0075] An electroplating stirring rod 7, which is vertically arranged in the middle of the fixing device and is used to stir the electrolyte;

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

[0077] The 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 portion of the inner conductor layer that exceeds the outer conductor to fix the inner conductor layer. The clamp is connected to a rotating motor that drives the clamp to rotate when pulling the outer conductor and then drives the inner conductor layer to rotate.

[0080] Specifically, the inner insulating layer 2 is coated on the outer side of the inner conductor 1 by a coating machine.

[0081] Optionally, the general value range of the uniform speed 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 implementation, the method of the present invention determines the up and down stirring rate of the electroplating stirring rod or determines the moving speed and initial rotation rate 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 uneven plating during the electroplating process, the inner conductor layer collides with the protruding part of the uneven plating during the sleeve connection process, or the inner conductor layer scratches the electroplating layer due to the resonance between the sleeve connection device 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 influence of the sleeve connection device and the inner conductor layer is reduced. By determining the initial rotation rate, the stability of the outer conductor wire drawing process is reduced due to the filamentous niobium scraped off the inner conductor layer and hooking with the inner conductor layer and the outer conductor respectively, thereby improving the conductive performance of the cable and increasing the 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 the temperature increase. By controlling the sleeve connection process of the inner conductor layer and the outer conductor, the stability of the cable and the stability of the assembly process of the inner conductor layer and the outer conductor are improved.

[0084] Specifically, determining the first speed mutation type and the second speed mutation type according to the travel speed change curve includes:

[0085] Obtaining a sudden change speed on the traveling speed change curve and a speed change range from the sudden change speed to a uniform speed;

[0086] If the time taken for the sudden change of the speed to the uniform speed is greater than the preset first time and less than the preset second time, the speed change range is determined to be the first speed sudden change type;

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

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

[0089] Specifically, the general value 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 characteristic of the first speed mutation type is that within the speed change range, the speed changes from uniform speed to mutation speed and then increases uniformly from mutation speed to uniform speed. The speed change characteristic of the second speed mutation type is that within the speed change range, the speed changes from uniform speed to mutation speed and then increases rapidly from mutation speed to uniform speed, or changes from uniform speed to mutation speed and then increases slowly from mutation speed to uniform speed.

[0092] Specifically, the general value range of the preset first time length is [0.4s, 1s], and the general value range of the preset second time length is [1.4s, 1.8s].

[0093] Preferably, the preferred embodiment of the preset first time length is 0.5 s, and the preferred embodiment of the preset second time length is 1.5 s.

[0094] In implementation, the type of speed mutation is determined and then the unstable factor of the sleeve connection is determined to improve the sleeve connection stability of the inner conductor layer and the outer conductor 4; if the first speed mutation type is found, it indicates that the up and down stirring rate of the stirring rod may be uneven during the electroplating process, and the motion parameters of the stirring rod are adjusted to ensure the uniformity of the coating; if the second speed mutation type occurs, it indicates that the degree of friction between the inner conductor layer and the outer conductor 4 may be too high or too low, and the sleeve connection motion parameters are adjusted to improve the detection accuracy.

[0095] Specifically, according to the outer conductor position where the first speed mutation type is generated, determining the upper and lower stirring rates of the electroplating stirring rod at the outer conductor position includes:

[0096] Obtaining a first mutation speed of the first speed mutation type;

[0097] Calculate a first speed difference between the uniform speed and the first sudden speed;

[0098] increasing the up and down stirring speed of the electroplating stirring rod according to the first speed difference;

[0099] The stirring position range of the electroplating stirring rod for stirring at the up and down stirring rates is determined according to the position of the outer conductor that produces the sudden speed.

[0100] Specifically, the stirring position range is from the outer conductor position where the sudden speed is generated to the outer conductor position at the end of the speed change range of the first speed sudden change type.

[0101] Specifically, the up and down stirring rate is the telescopic rod extension rate.

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

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

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

[0105] Specifically, adjusting the moving speed of the inner conductor layer in the outer conductor includes:

[0106] Obtaining the duration of the second speed 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 requirement, and the vibration intensity of the outer conductor during the sleeve connection process is obtained;

[0108] Calculating a vibration intensity difference between the vibration intensity and a preset vibration intensity;

[0109] The moving speed of the inner conductor layer within the outer conductor is increased according to the vibration intensity difference.

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

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

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

[0113] Specifically, the general value range of the preset vibration intensity is [1mm / s², 1.4mm / s²].

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

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

[0116] In implementation, the method of the present invention adjusts the moving speed of the inner conductor layer in the outer conductor. Since one end of the inner conductor layer is connected to the sleeve device, the distance between the inner conductor layer and the sleeve device is too far, which causes the sleeve device to vibrate and cause the resonance effects of various positions of the inner conductor layer to be inconsistent, resulting in a decrease in stability away from the end of the sleeve device, which in turn causes an increase in the scratching and friction effect of the inner conductor layer on the outer conductor during the sleeve process. By increasing the moving speed of the inner conductor layer in the outer conductor and increasing the resonance frequency of the inner conductor layer away from one end of the sleeve device, the friction during the sleeve process is reduced, thereby achieving an increase in the sleeve stability.

[0117] Specifically, determining the initial rotation rate of the inner conductor layer when the outer conductor starts to pull the wire 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 requirement, and a second mutation speed of the second speed mutation type is obtained;

[0119] Calculate a second speed difference between the uniform speed and the second sudden speed;

[0120] increasing the initial rotation speed of the inner conductor layer when the outer conductor starts pulling the wire according to the second speed difference;

[0121] The preset first duration is shorter than the preset second duration.

[0122] Specifically, the equipment for drawing the outer conductor is a crawler-type wire drawing machine.

[0123] Specifically, the initial rotation rate is positively correlated with the second speed difference.

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

[0125] In implementation, the method of the present invention determines the initial rotation rate of the inner conductor layer when the outer conductor begins to be pulled. Since the inner conductor layer scrapes the niobium wire of the lower coating during the sleeve connection process, there are connected niobium wires in the gap between the outer conductor and the inner conductor layer, resulting in uneven gaps, thereby reducing the stability of the wire drawing process. By increasing the initial rotation rate, the connection between the niobium wire and the inner conductor layer and the outer conductor is reduced, thereby reducing the vibration generated during wire drawing due to the connection of the niobium wire, thereby achieving improved mechanical strength and enhanced stability of the cable.

[0126] The present invention also provides a superconducting coaxial cable for a quantum computer, comprising: the superconducting coaxial cable comprises: an inner conductor 1 made of a niobium-titanium alloy, an outer conductor 4 made of a stainless steel tube with a niobide coating on the inner wall, an inner insulating layer 2 made of PTFE,

[0127] The wall thickness of the stainless steel tube is 0.06 mm, and the thickness of the niobium coating 3 is 0.01 mm.

[0128] In practice, the method of the present invention ensures the stable operation of the cable in an ultra-low temperature environment by using niobium-titanium alloy as the inner conductor 1 and utilizing its excellent superconducting properties and good mechanical strength. The superconducting transition temperature of niobium-titanium alloy is relatively high, so that the cable can reach a superconducting state without the need for extremely low temperatures, thereby improving the stability of the cable operation. At the same time, niobium-titanium alloy has good ductility and can withstand mechanical stress that may occur during manufacturing and use, thereby achieving improved long-term stability of the cable. By selecting a stainless steel tube of a specific thickness as the outer conductor 4, the mechanical properties and electromagnetic shielding properties of the cable are improved, which not only improves the mechanical strength but also reduces unnecessary weight increase, thereby achieving lightweight cable without affecting the performance of the cable. By electroplating niobium on the inner wall of the stainless steel tube, the electrical conductivity and corrosion resistance of the cable are increased. By using magnesium oxide as the material of the inner insulating layer 2 and utilizing its good insulating properties and thermal stability, the operation safety of the cable in a high temperature environment is improved. Magnesium oxide has a high melting point and good thermal conductivity, thereby achieving improved uniformity of temperature distribution inside the cable.

[0129] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle 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 fall within the protection scope of the present invention.

Claims

1. A method for manufacturing a superconducting coaxial cable for a quantum computer, characterized in that: include: An inner insulating layer is coated on the outer side of the inner conductor to form an inner conductor layer, and a niobium coating layer is electroplated on the inner wall of the stainless steel tube to form an outer conductor; The sleeve device sleeves a single inner conductor layer into a single outer conductor according to a set sleeve motor speed to form a cable conductive layer; Obtaining a travel speed variation curve of a single inner conductor layer inside a single outer conductor; Determining a first speed mutation type and a second speed mutation type according to the travel speed change curve; Determining the upper and lower stirring rates of the electroplating stirring rod at the outer conductor position according to the outer conductor position generating the first speed mutation type; Control the electroplating stirring rod to electroplate the inner wall of the stainless steel tube at the outer conductor position according to the up and down stirring rate; Determining the degree of friction between the inner conductor layer and the outer conductor according to the duration of the second speed mutation type; The inner conductor movement adjustment mode is determined according to the friction degree between the inner conductor layer and the outer conductor, including adjusting the moving speed of the inner conductor layer in the outer conductor, or, determining the initial rotation rate of the inner conductor layer when the outer conductor starts pulling the wire according to the speed change amount of the second speed mutation type; The inner conductor layer is sleeved inside the outer conductor according to the inner conductor movement adjustment method, and the sleeved outer conductor is pulled so that the outer conductor is covered on the inner conductor layer to form a cable; Wherein, determining the first speed mutation type and the second speed mutation type according to the travel speed change curve includes: Obtaining a sudden change speed on the traveling speed change curve and a speed change range from the sudden change speed to a uniform speed; If the time taken for the sudden change of the speed to the uniform speed is greater than the preset first time and less than the preset second time, the speed change range is determined to be the first speed sudden change type; If the time taken for the sudden speed to change to the uniform speed is less than or equal to the preset first time or greater than or equal to the preset second time, the speed change range is determined to be the second speed sudden change type; The sudden change speed is the speed of a conductor layer in the speed change curve that is less than the uniform speed and whose difference with the uniform speed is greater than or equal to a preset sudden change difference, inside a single outer conductor.

2. The method for manufacturing a superconducting coaxial cable for a quantum computer according to claim 1, characterized in that: Determining the upper and lower stirring rates of the electroplating stirring rod at the outer conductor position according to the outer conductor position generating the first speed mutation type comprises: Obtaining a first mutation speed of the first speed mutation type; Calculate a first speed difference between the uniform speed and the first sudden speed; increasing the up and down stirring speed of the electroplating stirring rod according to the first speed difference; The stirring position range of the electroplating stirring rod for stirring at the up and down stirring rates is determined according to the position of the outer conductor that produces the sudden 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 sudden speed is generated to the outer conductor position where the speed change range of the first speed sudden change type ends.

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 speed 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: Adjust the movement speed of the inner conductor layer in the outer conductor, including: Obtaining the duration of the second speed 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 requirement, and the vibration intensity of the outer conductor during the sleeve connection process is obtained; Calculating a vibration intensity difference between the vibration intensity and a preset vibration intensity; The moving speed of the inner conductor layer within the outer conductor is increased according to 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 vibration intensity difference.

7. The method for manufacturing a superconducting coaxial cable for a quantum computer according to claim 6, characterized in that: The step of determining the initial rotation rate of the inner conductor layer when the outer conductor begins to pull the wire comprises: 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 requirement, and a second mutation speed of the second speed mutation type is obtained; Calculate a second speed difference between the uniform speed and the second sudden speed; increasing the initial rotation rate of the inner conductor layer when the outer conductor starts pulling the wire according to the second speed difference; The preset first duration is shorter 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 rotation rate is positively correlated with the second speed difference.

9. A superconducting coaxial cable manufactured by the method for manufacturing a superconducting coaxial cable for a quantum computer according to any one of claims 1 to 8, characterized in that: The superconducting coaxial cable is made of niobium-titanium alloy as the inner conductor, a stainless steel tube with a niobium coating on the inner wall as the outer conductor, and PTFE as the inner insulation layer. Wherein, the wall thickness of the stainless steel tube is 0.06 mm, and the thickness of the niobium coating is 0.01 mm.

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