Magnetic field generating device for a nuclear magnetic resonance quantum computer and quantum computer

Abstract

The utility model discloses a kind of magnetic field generating device and quantum computer for nuclear magnetic resonance quantum computer.The device includes: yoke frame and at least a pair of oppositely arranged magnetic field generating units;Magnetic field generating unit includes a permanent magnet and a pole head;Two permanent magnets in each pair of magnetic field generating units, respectively set on the two side walls of yoke frame;Two pole heads in a pair of magnetic field generating units are set on the corresponding permanent magnet, and are connected by bolt or magnetically attracted between the corresponding permanent magnet;At least one permanent magnet and the connected pole head have holes, and the hole on the permanent magnet corresponds with the hole position on the connected pole head;The magnetic field generated by permanent magnet in at least a pair of magnetic field generating units forms closed loop through yoke frame, and forms uniform magnetic field between pole head.The utility model can realize low power consumption, miniaturization and stable uniform magnetic field output, better satisfy the demand of uniform magnetic field required by nuclear magnetic resonance quantum computer.

Description

Technical Field

[0001] This utility model relates to the field of quantum computing technology, and in particular to a magnetic field generating device for nuclear magnetic resonance quantum computers and a quantum computer. Background Technology

[0002] Nuclear magnetic resonance (NMR) quantum computers achieve quantum computing by manipulating the spin states of atomic nuclei. Their core relies on highly uniform static magnetic fields and high-precision radio frequency pulses. The uniformity of the static magnetic field directly affects the manipulation precision and decoherence time of the qubits, making it a key indicator of quantum computing performance.

[0003] Currently, the uniformity of traditional permanent magnets is generally in the 200ppm range, which is insufficient for the requirements of quantum computers. Although superconducting magnets can achieve even higher uniformity (such as 0.1ppm in hospital magnetic resonance imaging (MRI) equipment), their large size (several cubic meters), high current requiring liquid helium cooling (high energy consumption), and immobility make them unsuitable for MRI quantum computers, contradicting the trend of miniaturization and deployability in quantum computing. Utility Model Content

[0004] In view of the above problems, this utility model is proposed to provide a magnetic field generating device and a quantum computer for nuclear magnetic resonance quantum computer that overcomes or at least partially solves the above problems.

[0005] In a first aspect, this utility model provides a magnetic field generating device for a nuclear magnetic resonance quantum computer, comprising: a yoke frame, at least a pair of magnetic field generating units arranged opposite to each other, each magnetic field generating unit comprising a permanent magnet and a pole head;

[0006] The two permanent magnets in each pair of magnetic field generating units are respectively set on the opposite side walls of the yoke frame; the two poles in each pair of magnetic field generating units are respectively set on the corresponding permanent magnets facing each other, and are connected to the corresponding permanent magnets by bolts or magnetic attraction.

[0007] In at least one pair of magnetic field generating units, there is at least one permanent magnet and a hole on the connected pole, and the hole on the permanent magnet corresponds to the hole on the connected pole.

[0008] The magnetic field generated by the permanent magnets in at least one pair of magnetic field generating units forms a closed loop through the yoke frame and forms a uniform magnetic field between the opposing poles.

[0009] In one embodiment, in a pair of magnetic field generating units arranged in opposite directions, both permanent magnets and the connected poles are provided with holes;

[0010] Alternatively, in a pair of magnetic field generating units facing each other, one magnetic field generating unit has holes in both the permanent magnet and the connected pole head, while the other magnetic field generating unit does not have holes in either the permanent magnet or the connected pole head.

[0011] In one embodiment, the hole on the permanent magnet is a through hole.

[0012] In one embodiment, the hole on the electrode head is a through hole or a blind hole.

[0013] In one embodiment, the holes on the permanent magnet and / or the holes on the pole head are threaded holes.

[0014] Alternatively, both the holes on the permanent magnet and the holes on the pole head are non-threaded holes.

[0015] In one embodiment, the number of holes on the permanent magnet is one or more, and the number of holes on the pole head is one or more.

[0016] In one embodiment, the yoke frame is a steel frame composed of steel blocks enclosing the frame on all four sides, and the permanent magnets are respectively disposed on the inner walls of two steel blocks arranged opposite to each other in the steel frame.

[0017] In one embodiment, the ratio of the diameter of the hole in the permanent magnet to the diameter of the permanent magnet is greater than 0 and less than or equal to 50%.

[0018] The ratio of the diameter of the hole in the electrode head to the diameter of the electrode head is greater than 0 and less than or equal to 50%.

[0019] The ratio of the depth to the thickness of the blind hole in the electrode head is 1 / 4 to 3 / 4.

[0020] In one embodiment, the permanent magnet is made of a hard magnetic material; the hard magnetic material is any one or more of neodymium iron boron magnets, ferrite magnets, and samarium cobalt magnets.

[0021] The yoke frame and pole head are made of steel.

[0022] In a second aspect, a quantum computer is characterized in that the quantum computer includes a magnetic field generating device and a nuclear magnetic resonance sample as described above;

[0023] The nuclear magnetic resonance sample is placed between opposing electrodes in the magnetic field generating device.

[0024] The beneficial effects of the above-mentioned technical solutions provided by the embodiments of this utility model include at least the following:

[0025] The magnetic field generating device and quantum computer for nuclear magnetic resonance quantum computer provided in this embodiment of the invention form a magnetic field compensation region by opening holes corresponding to the positions of the permanent magnet and the pole head in the magnetic field generating unit, so as to adjust the local magnetic field distribution and improve the magnetic field uniformity. This results in a magnetic field with a uniformity of less than or equal to 50ppm between the pole heads, which is much lower than the 200ppm of traditional permanent magnets, without reducing the magnetic field strength. The structure is relatively simple, which solves the problems of high energy consumption and immobility of existing superconducting MRI equipment. It achieves low power consumption, miniaturization and stable uniform magnetic field output, which can better meet the uniform magnetic field requirements of nuclear magnetic resonance quantum computer.

[0026] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0027] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0028] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0029] Figure 1 This is a schematic diagram of the magnetic field generating device in an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the permanent magnet and the hole on the pole head in the magnetic field generating device in this embodiment of the present invention;

[0031] Figure 3A and Figure 3B This is a calculation diagram of the magnetic field line distribution of the magnetic field generating device in the case of no holes / holes in the permanent magnet and pole head in the embodiments of this utility model;

[0032] Figure 4A and Figure 4B This is a thermal map of the magnetic field of the magnetic field generator in the working area (central region of the permanent magnet and pole head) in the embodiment of this utility model, with and without holes in the permanent magnet and pole head.

[0033] Figure 5 This is a simulation result diagram showing the influence of different aperture sizes on the uniformity of the magnetic field between the poles in an embodiment of this utility model.

[0034] Figure 6This is a schematic diagram comparing the simulation results of the magnetic field non-uniformity of the magnetic field generating device with and without openings in an embodiment of this utility model.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1-Yoke frame;

[0037] 2-Permanent magnet;

[0038] 3-Extreme head;

[0039] 21 - Holes on the permanent magnet;

[0040] 31 - The hole on the pole head. Detailed Implementation

[0041] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0042] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0043] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "far," "near," "front," and "rear," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0045] The inventors of this application have discovered that while existing superconducting magnets can meet the requirements for magnetic uniformity, their large size, high energy consumption, and immobility fail to meet the miniaturization and deployability requirements of quantum computers. Further solutions have emerged in the prior art, such as Halbach arrays. Halbach array magnet structures are formed by arranging permanent magnets with different magnetization directions to create an array of magnets. This creates a stronger magnetic field on one side and a weaker magnetic field on the other. However, Halbach arrays rely on the magnet arrangement direction and the assistance of magnetic conductors to achieve a uniform magnetic field, and typically require a large number of permanent magnets (at least eight), resulting in a complex structure.

[0046] In order to provide the highly uniform magnetic field required for nuclear magnetic resonance quantum computers and to meet the development trend of miniaturization and deployability of quantum computers, this utility model provides a magnetic field generating device for nuclear magnetic resonance quantum computers.

[0047] This utility model provides a magnetic field generating device for nuclear magnetic resonance quantum computers, referring to... Figure 1 and Figure 2 As shown, the magnetic field generating device specifically includes: a yoke frame 1 and at least one pair of opposing magnetic field generating units, each magnetic field generating unit including a permanent magnet 2 and at least one pair of poles 3; wherein:

[0048] Two permanent magnets 2 in each pair of magnetic field generating units are respectively set on the opposite side walls of the yoke frame 1; two poles 3 in each pair of magnetic field generating units 2 are respectively set on the corresponding permanent magnets 2 facing each other, and are connected to the corresponding permanent magnets 2 by bolts or magnetic attraction.

[0049] In at least one pair of magnetic field generating units 2, there is at least one permanent magnet 2 and a hole on the connected pole head 3, and the hole on the permanent magnet 2 corresponds to the hole on the connected pole head 3.

[0050] For ease of understanding, Figure 2 In the diagram, the hole on the permanent magnet 2 is shown as hole 211, and the hole on the pole head 3 is shown as hole 31.

[0051] The magnetic field generated by the permanent magnets 2 in at least one pair of magnetic field generating units 2 forms a closed loop through the yoke frame 1, forming a uniform magnetic field between the opposing pole heads 3.

[0052] In the structure of the above-mentioned magnetic field generating device, the yoke frame 1 serves to form a closed magnetic circuit and constrain the direction of the magnetic field to reduce magnetic field loss.

[0053] The aforementioned yoke frame 1, permanent magnet 2, and pole head 3 can be detachably connected, for example, by standard bolts, which facilitates disassembly and maintenance and allows for quick replacement of pole heads 3 with different hole depths to ensure the uniformity of the magnetic field.

[0054] In another embodiment, the permanent magnet 2 and the pole head 3 can be tightly connected together due to magnetic attraction, without the need for additional bolt connection, which makes the structure of the magnetic field generating device simpler.

[0055] In the structure of the above-mentioned magnetic field generating device, refer to Figure 1 As shown, in a pair of magnetic field generating units, one of the magnetic field generating units includes a pole head 3 and a permanent magnet 2 connected to the pole head 3. On the opposite side, another magnetic field generating unit, another pole head 3, and another permanent magnet 2 connected to the pole head 3 are arranged on opposite side walls of the yoke frame 1, forming a symmetrical structure. In this embodiment of the invention, Figure 1 The diagram shows a pair of symmetrically arranged magnetic field generating units 2. Those skilled in the art will understand that there can be more than one such symmetrical structure; it can be one or more pairs of magnetic field generating units arranged facing each other. In the case of multiple sets, the opposing pole heads 3 and the connected permanent magnets 2 can form an array. Figure 1 The illustration shows a pair of pole heads 3 and a pair of permanent magnets 2. This is for illustrative purposes only and is not intended to limit the scope of this invention.

[0056] In one embodiment, the permanent magnet 2 serves to generate the main magnetic field, wherein the holes on the permanent magnet 2 are used to guide magnetic field compensation, thereby improving the uniformity of the entire magnetic field.

[0057] The pole head 3 is connected to the permanent magnet 2. The pole head 3 and the permanent magnet 2 together form a magnetic field loop. The hole 31 on the pole head 3 corresponds to the hole 21 on the permanent magnet 2. The hole 21 on the permanent magnet 2 and the hole 31 on the pole head 3 together play the role of adjusting the local magnetic field distribution and compensating for the uniformity of the magnetic field of the magnet.

[0058] The reason for making holes in at least one permanent magnet 2 and the connected pole head 3 is that the inventors of this application accidentally discovered during the research and development of a magnetic field generating device suitable for nuclear magnetic resonance quantum computers that, for permanent magnet 2 and pole head 3 without holes, the magnetic field strength generated by permanent magnet 2 is usually weaker near the center than at the edge of permanent magnet 2. This may lead to an unsatisfactory magnetic field uniformity in the working area (the location where the nuclear magnetic resonance sample is placed) between pole heads 3.

[0059] In the magnetic field generating device provided in this embodiment of the present invention, at least one pole head 3 and the permanent magnet 2 connected thereto have holes. The holes on the permanent magnet 2 allow the magnetic field lines to converge toward the center and reduce edge divergence. For the pole head 3, the holes 31 at the corresponding positions can further constrain the magnetic field distribution, thereby forming a magnetic field compensation region that is complementary to the holes 21 on the permanent magnet 2. Thus, a uniform magnetic field with good uniformity (magnetic field uniformity less than 50ppm) is finally achieved in the working area between the pole heads 3.

[0060] Reference Figure 3A and Figure 3B As shown, Figure 3A The diagram shown is a calculated distribution of magnetic field lines in the magnetic field generating device when the permanent magnet 2 and the pole head 3 are not perforated. Figure 3B The diagram shown is a calculated distribution of magnetic field lines in the magnetic field generating device after the holes are opened in permanent magnet 2 and pole head 3. Figure 3A and Figure 3B The comparison shows that the perforated structure changes the distribution of magnetic field lines in the central region of permanent magnet 2 and pole head 3.

[0061] Reference Figure 4A and Figure 4B As shown, Figure 4A The diagram shown is a thermal image of the magnetic field in the working area (the central region of permanent magnet 2 and pole head 3) of the magnetic field generator when the permanent magnet 2 and pole head 3 are not perforated. Figure 4B The diagram shows the magnetic field thermogram of the magnetic field generator in the working area (the central region of permanent magnet 2 and pole head 3) with the permanent magnet 2 and pole head 3 open. Figure 4A and Figure 4B The comparison shows that, within the same magnetic field gradient (6Gs), Figure 4B The uniformity of the medium magnetic field thermogram is better than Figure 4A , ( Figure 4A and Figure 4B The red color indicates the magnetic field strength, which can be seen from the consistency of the color's intensity. Figure 4B The uniformity of the medium magnetic field is better than Figure 4A This indicates that introducing an open structure into the permanent magnet 2 and the pole head 3 can better improve the uniformity of the central region of the magnet.

[0062] Furthermore, the method of opening holes in permanent magnet 2 and pole head 3 achieves the purpose of improving magnetic field uniformity without affecting magnetic field strength. Compared with the existing Halbach array magnet structure, the structure is simpler (a pair of permanent magnets and a pair of pole heads can also be achieved), which can realize low power consumption, miniaturization and stable uniform magnetic field output, and can be better adapted to nuclear magnetic resonance quantum computers.

[0063] In one embodiment, in a pair of permanent magnets 2 and pole heads 3 arranged facing each other, both the pair of permanent magnets 2 and the connected pole heads 3 have holes.

[0064] Alternatively, in a pair of permanent magnets 2 and pole heads 3 facing each other, one side of the permanent magnet 2 and the connected pole head 3 both have holes, while the other side of the permanent magnet 2 and the connected pole head 3 do not have holes.

[0065] In one embodiment, the hole 21 on the permanent magnet is a through hole, that is, the hole 21 on the permanent magnet extends through the entire thickness of the permanent magnet 2.

[0066] In one embodiment, the hole 31 on the electrode head can be, for example, a through hole or a blind hole.

[0067] The hole 31 on the pole head can be classified according to its internal shape, for example, it can be a cylindrical hole, or a stepped hole (or a conical hole).

[0068] For the blind hole on the pole head 3, the open end faces the permanent magnet 2, and the closed end is located inside the pole head 3.

[0069] In one embodiment, the hole 21 on the permanent magnet and / or the hole 31 on the pole head are threaded holes; that is, there may be three situations: the hole 21 on the permanent magnet is a threaded hole and the hole 31 on the pole head is a non-threaded hole; or the hole 21 on the permanent magnet is a non-threaded hole and the hole 31 on the pole head is a threaded hole; or both the hole 21 on the permanent magnet and the hole 31 on the pole head are threaded holes.

[0070] Alternatively, the holes 21 on the permanent magnet and 31 on the pole head are both non-threaded holes.

[0071] In one embodiment, the number of holes 21 on the permanent magnet is one or more, and the number of holes 31 on the pole head is one or more.

[0072] Optionally, the hole 21 on the permanent magnet can be located at the center of the permanent magnet 2, and similarly, the hole 31 on the pole head can be located at the center of the pole head 3. If the number of holes 31 on the pole head and holes 21 on the permanent magnet is single, the position of the hole 31 on the pole head corresponds to the position of the hole 21 on the permanent magnet, for example, it can be set at the center. If the number of holes 31 on the pole head and holes 21 on the permanent magnet is multiple, the multiple holes 31 on the pole head correspond one-to-one with the positions of the multiple holes 21 on the permanent magnet. This embodiment of the present invention is not limited to the center position.

[0073] In terms of material selection, permanent magnet 2 is a hard magnetic material;

[0074] Furthermore, the aforementioned hard magnetic materials include any one or more of neodymium iron boron magnets, ferrite magnets, and samarium cobalt magnets;

[0075] The yoke frame 1 and the pole head 3 are made of steel.

[0076] Specifically, the permanent magnet 2 can be, for example, N52 neodymium iron boron magnet (remanence ≥1.4T). This material can provide suitable structural strength support for the opening while ensuring high magnetic field strength.

[0077] The yoke frame 1 and the pole head 3 can be made of, for example, 45# steel. Using 45# steel can optimize magnetic field conduction efficiency and reduce energy consumption.

[0078] In one embodiment, the ratio of the diameter of the hole 21 of the permanent magnet 2 to the diameter of the permanent magnet 2 is greater than 0 and less than or equal to 50%.

[0079] Similarly, the ratio of the diameter of the hole 31 of the electrode 3 to the diameter of the electrode 3 is greater than 0 and less than or equal to 50%.

[0080] For example, if the permanent magnet 2 uses a magnet with a diameter of 90mm, then the diameter of the hole 21 on the permanent magnet can range from 4mm to 10mm; for example, the diameter can be any one of M4, M6, M8, and M10. Of course, the permanent magnet 2 can also use magnets with larger or smaller diameters, in which case the diameter of its hole 21 can be reasonably selected according to the above range.

[0081] For example, if the diameter of the pole head 3 is also selected to be around 90mm, the diameter of the hole 31 on the pole head can also be set to a range of 4mm-10mm; the diameter of the hole 31 on the pole head is similar to the diameter of the hole 21 on the permanent magnet 2, and can be selected as any one of M4 (hole diameter is 4mm), M6 (hole diameter is 6mm), M8 (hole diameter is 8mm) and M10 (hole diameter is 10mm).

[0082] The ratio of the blind hole depth to the thickness of the electrode head 3 is 1 / 4 to 3 / 4 to ensure the magnetic field compensation effect.

[0083] Experimental simulations revealed that the deeper the blind hole of pole head 3, the better the uniformity of the magnetic field in the working area between a pair of pole heads 3.

[0084] The influence of the aperture diameters on pole head 3 and permanent magnet 2 on the uniformity of the magnetic field between pole heads 3 can be found in the simulation results. Figure 5 As shown, Figure 5 When the diameter of the holes on pole head 3 and permanent magnet 2 changes from 4mm to 10mm, the X-axis direction (e.g.) Figure 3B The diagram shows a comparison of magnetic field inhomogeneities (direction of the X-axis). Figure 5 As can be seen, the magnetic field non-uniformity decreases overall as the aperture of the holes on pole head 3 and permanent magnet 2 increases, but there is an optimal value (shown by the orange line). When the aperture increases to 10 mm, the magnetic field non-uniformity in a small region (5 mm × 5 mm × 5 mm) between pole heads 3 increases.

[0085] For the Y-axis (e.g.) Figure 3B In the case of the direction perpendicular to the paper (e.g., along the X-axis), the inhomogeneity of the magnetic field is similar to that along the Z-axis. Figure 3B In the Z-axis direction, when the aperture increases from 6mm to 8mm, the magnetic field non-uniformity does not decrease, but increases, and is greater than that of the structure without an aperture.

[0086] In one embodiment, the yoke frame 1 is a steel frame composed of steel blocks enclosing the frame on all four sides, and the permanent magnets 2 are respectively disposed on the inner walls of two steel blocks that are arranged opposite to each other in the steel frame.

[0087] A 45# steel yoke frame 1 with four sides enclosed is used to form a closed magnetic circuit to reduce magnetic leakage and enhance magnetic field concentration.

[0088] The yoke frame 1 and the pole head 3 can also be made of other materials with better magnetic permeability. This embodiment of the utility model is not limited to steel.

[0089] The magnetic field generating device provided in this embodiment of the utility model has an overall structure that, in addition to being Figure 1 The H-shape shown can also be a C-shape (with an opening on one side of the yoke frame 1) or a shape similar to the Halbach shape (the yoke frame 1 contains several pairs of magnet arrays composed of permanent magnets 2 and pole heads 3). This embodiment of the present invention does not limit this.

[0090] Reference Figure 6 As shown, Figure 6 yes Figure 1 The simulation results of the magnetic field non-uniformity of the magnetic field generator shown are as follows: Figure 6It can be seen that, based on the same structure, opening holes in permanent magnet 2 and pole head 3 significantly reduces the magnetic field non-uniformity compared to the structure without opening holes in permanent magnet 2 and pole head 3.

[0091] for Figure 1 The structure of the magnetic field generator shown, and an example of its assembly process, may include the following steps:

[0092] S1. Install the pole head 3 (e.g., a steel block of No. 45 steel) onto the surface of the permanent magnet 2 (e.g., N52 neodymium iron boron magnet), and fix them together with M6 bolts (in this step, if the permanent magnet 2 and the pole head 3 are directly attracted by magnetism, they can also be fixed without bolts). Align the blind hole of the pole head 3 with the through hole on the permanent magnet 2 to form a magnetic field compensation structure.

[0093] S2. The combination of permanent magnet 2 and pole head 3 is symmetrically installed on the inner surface of the two yoke iron frames 1.

[0094] S3. Four 45# steel blocks are joined together and fixed with bolts to form a yoke frame 1. Then, the yoke frame 1 is fixed to the base of the quantum computer with anchor bolts.

[0095] Based on the same inventive concept, this utility model embodiment also provides a quantum computer, which includes a magnetic field generating device and a nuclear magnetic resonance sample as described above; wherein the nuclear magnetic resonance sample is disposed between opposing poles 3 in the magnetic field generating device.

[0096] The magnetic field generating device and quantum computer provided in this embodiment of the invention form a magnetic field compensation region by opening holes at corresponding positions on the permanent magnet 2 and the pole head 3, so as to adjust the local magnetic field distribution and improve the magnetic field uniformity. This results in a magnetic field with a uniformity of less than or equal to 50 ppm between the pole heads 3, which is far lower than the 200 ppm level of traditional permanent magnets. At the same time, it does not reduce the magnetic field strength, and the structure is relatively simple. It solves the problems of high energy consumption and immobility of existing superconducting MRI equipment, and realizes low power consumption, miniaturization and stable uniform magnetic field output, which better meets the uniform magnetic field requirements of nuclear magnetic resonance quantum computers.

[0097] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A magnetic field generating device for a nuclear magnetic resonance quantum computer, characterized by include: A yoke frame and at least one pair of opposing magnetic field generating units; each magnetic field generating unit includes a permanent magnet and a pole head; The two permanent magnets in each pair of magnetic field generating units are respectively set on the opposite side walls of the yoke frame; The two poles in a pair of magnetic field generating units are respectively set on the corresponding permanent magnets facing each other, and are connected to the corresponding permanent magnets by bolts or magnetic attraction; In at least one pair of magnetic field generating units, there is at least one permanent magnet and a hole on the connected pole, and the hole on the permanent magnet corresponds to the hole on the connected pole. The magnetic field generated by the permanent magnets in at least one pair of magnetic field generating units forms a closed loop through the yoke frame and forms a uniform magnetic field between the opposing poles.

2. The magnetic field generating device of claim 1, wherein In a pair of magnetic field generating units arranged in opposite directions, holes are opened in both permanent magnets and the connected poles; Alternatively, in a pair of magnetic field generating units facing each other, one magnetic field generating unit has holes in both the permanent magnet and the connected pole head, while the other magnetic field generating unit does not have holes in either the permanent magnet or the connected pole head.

3. The magnetic field generating device as described in claim 1, characterized in that, The holes on the permanent magnet are through holes.

4. The magnetic field generating device of claim 1, wherein The hole on the electrode head is either a through hole or a blind hole.

5. The magnetic field generating device according to claim 3 or 4, characterized in that The holes on the permanent magnet and / or the holes on the pole head are threaded holes. Alternatively, both the holes on the permanent magnet and the holes on the pole head are non-threaded holes.

6. The magnetic field generating device according to claim 3 or 4, wherein The number of holes on the permanent magnet is one or more, and the number of holes on the pole head is one or more.

7. The magnetic field generating device of any one of claims 1 to 4, wherein The yoke frame is a steel frame composed of steel blocks enclosing the frame on all four sides, and the permanent magnets are respectively disposed on the inner walls of two steel blocks that are arranged opposite each other in the steel frame.

8. The magnetic field generating device according to any one of claims 1-4, characterized in that, The ratio of the diameter of the hole in the permanent magnet to the diameter of the permanent magnet is greater than 0 and less than or equal to 50%. The ratio of the diameter of the hole in the electrode head to the diameter of the electrode head is greater than 0 and less than or equal to 50%. The ratio of the depth to the thickness of the blind hole in the electrode head is 1 / 4 to 3 / 4.

9. The magnetic field generating device of any one of claims 1-4, wherein, The permanent magnet is made of a hard magnetic material; the hard magnetic material is any one or more of neodymium iron boron magnets, ferrite magnets, and samarium cobalt magnets. The yoke frame and pole head are made of steel.

10. A quantum computer, comprising: The quantum computer includes a magnetic field generating device and a nuclear magnetic resonance sample as described in any one of claims 1-9; The nuclear magnetic resonance sample is placed between opposing electrodes in the magnetic field generating device.

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