CN219812420U - Magnetic shielding structure, dilution refrigerator and quantum computer - Google Patents
Magnetic shielding structure, dilution refrigerator and quantum computer Download PDFInfo
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- CN219812420U CN219812420U CN202321374137.4U CN202321374137U CN219812420U CN 219812420 U CN219812420 U CN 219812420U CN 202321374137 U CN202321374137 U CN 202321374137U CN 219812420 U CN219812420 U CN 219812420U
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- 239000012895 dilution Substances 0.000 title claims abstract description 14
- 238000010790 dilution Methods 0.000 title claims abstract description 14
- 229910000889 permalloy Inorganic materials 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 3
- 239000004065 semiconductor Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 9
- 101001001429 Homo sapiens Inositol monophosphatase 1 Proteins 0.000 description 8
- 102100035679 Inositol monophosphatase 1 Human genes 0.000 description 8
- 238000011999 immunoperoxidase monolayer assay Methods 0.000 description 8
- GHZKGHQGPXBWSN-UHFFFAOYSA-N methyl(propan-2-yloxy)phosphinic acid Chemical compound CC(C)OP(C)(O)=O GHZKGHQGPXBWSN-UHFFFAOYSA-N 0.000 description 8
- 230000008878 coupling Effects 0.000 description 6
- 238000010168 coupling process Methods 0.000 description 6
- 238000005859 coupling reaction Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000004907 flux Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000002096 quantum dot Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The utility model discloses a magnetic shielding structure, a dilution refrigerator and a quantum computer, wherein the magnetic shielding structure comprises a cover body with an opening at one end, a cover plate and a hanging plate; the cover plate is covered at the opening end of the cover body; the hanging plate is positioned in the cover body, and the parametric amplifier is arranged on the hanging plate; the cover body is provided with a through hole which is used for realizing the electrical connection between the parametric amplifier and a device outside the cover body. Through installing parametric amplifier on the link plate of the internal portion of cover for parametric amplifier is located the internal portion of cover, then locates the apron lid the open end of the cover, makes parametric amplifier be in the magnetic shielding structure of relative seal, has avoided the interference of external magnetic field, through setting up the through-hole, realizes the electric connection between parametric amplifier and the external device of cover, makes parametric amplifier can normally work under the required external magnetic field of quantum chip test.
Description
Technical Field
The utility model relates to the technical field of quantum computers, in particular to a magnetic shielding structure, a dilution refrigerator and a quantum computer.
Background
The semiconductor gating quantum dot has better integration and expansibility, and is compatible with the traditional semiconductor manufacturing process which has been developed and matured in the industry, so that the semiconductor gating quantum dot becomes one of the main research systems of the quantum computation at present. The semiconductor quantum bit is used as one of the semiconductor gating quantum dots, and currently, the main flow mode of large-scale long-range coupling expansion adopts a microwave resonant cavity coupling scheme, and the reading of bit information is realized by utilizing the conversion of the semiconductor quantum bit and cavity microwave photon strong coupling information. Further, the coupling between different bits is achieved indirectly through the coupling of cavity microwave photons with semiconductor qubits at different distribution locations. The microwave resonant cavity is used as a very stable and flexible quantum interconnection bus, and plays an excellent integrated long-range expansion advantage.
In general, a semiconductor quantum chip that is extended in a long range by using a microwave cavity coupling reading method needs to effectively amplify a read signal at an extremely low temperature, so as to reduce thermal noise brought by a higher temperature region and noise influence of a circuit and a device itself to the greatest extent. The working frequency band of the IMPA parametric amplifier is in 6-8GHz (the working frequency band of the microwave resonant cavity is generally 5-10 GHz), the working frequency center of the IMPA parametric amplifier is adjustable, the typical gain is more than 20dB, the IMPA parametric amplifier has a gain bandwidth of typically more than 400MHz, and the noise temperature is only about 150mK, so that the standard quantum limit level of half photons is achieved. The series of parametric amplifiers are particularly suitable for weak signal amplification of cavity-coupled read semiconductor qubits.
In semiconductor quantum computing, the spin state of a single electron in a magnetic field is a typical two-level system, and zeeman cleavage occurs between different spin states under the magnetic field. Therefore, the implementation of semiconductor spin qubits requires that the working environment of the quantum chip be under a certain external magnetic field environment. Whereas IMPA is a typical josephson parametric amplifier, IMPA consists of a nonlinear oscillator (superconducting quantum interference device (SQUID) loop) in the Josephson Parametric Amplifier (JPA) circuit, and a wavelength-to-impedance converter. Superconducting quantum interference device (SQUID) loops are very sensitive to magnetic fields and cannot work normally under external magnetic fields. The property of IMPA that it is not resistant to magnetic fields greatly limits its application in the semiconductor quantum field, as well as in other working environments where magnetic fields are present.
It should be noted that the information disclosed in the background section of the present utility model is only for enhancement of understanding of the general background of the present utility model and should not be taken as an admission or any form of suggestion that this information forms the prior art already known to those skilled in the art.
Disclosure of Invention
The utility model aims at: the magnetic shielding structure, the dilution refrigerator and the quantum computer are provided, and the influence of an external magnetic field on the parametric amplifier is avoided, so that the parametric amplifier can work normally under the external magnetic field.
In order to achieve the above object, the present utility model provides the following technical solutions:
the first aspect of the present utility model provides a magnetic shielding structure comprising a cover body having one end opened, a cover plate and a hanging plate;
wherein, the cover plate is covered at the opening end of the cover body; the hanging plate is positioned in the cover body, and the parametric amplifier is arranged on the hanging plate;
the cover body is provided with a through hole, and the through hole is used for realizing the electrical connection between the parametric amplifier and a device outside the cover body.
The magnetic shield structure as described above, further, the shield body is cylindrical.
The magnetic shielding structure as described above, further, a ratio of a minimum distance between the through hole and the parametric amplifier to a diameter of the through hole is greater than 5.
In the magnetic shielding structure, when the cover body is cylindrical with one end open, the ratio of the length of the cover body to the diameter of the opening is more than or equal to 4; the minimum distance between the parametric amplifier and the open end is greater than the diameter of the opening.
In the magnetic shielding structure, the cover body and the cover plate are made of permalloy.
The magnetic shielding structure as described above, further, the hanging plate is detachably mounted on the cover plate.
In the magnetic shielding structure, further, the open end of the cover body extends outwards to form an ear plate, and the ear plate is detachably mounted on the cover plate.
According to the magnetic shielding structure, further, the boss is arranged on one surface, close to the cover body, of the cover plate, and the boss is clamped with the opening end of the cover body.
The second aspect of the utility model provides a dilution refrigerator, comprising a cold disc and the magnetic shielding structure, wherein the cover plate of the magnetic shielding structure is detachably arranged on the cold disc.
A third aspect of the utility model provides a quantum computer comprising a dilution refrigerator as described above.
The utility model has the beneficial effects that:
according to the magnetic shielding structure, the parametric amplifier is arranged on the hanging plate in the cover body, so that the parametric amplifier is positioned in the cover body, then the cover plate is covered at the opening end of the cover body, so that the parametric amplifier is positioned in the relatively sealed magnetic shielding structure, the interference of an external magnetic field is avoided, and the electrical connection between the parametric amplifier and devices outside the cover body is realized through the arrangement of the through holes; and furthermore, the parametric amplifier (such as IMPA) can work normally under an external magnetic field required by the quantum chip test, and meanwhile, the magnetic shielding structure cannot introduce thermal noise or signal disturbance.
The dilution refrigerator and the quantum computer provided by the utility model comprise the magnetic shielding structure, so that the dilution refrigerator and the quantum computer have the same beneficial effects and are not repeated herein.
Drawings
Fig. 1 is a schematic view of a magnetic shielding structure provided in an embodiment of the present utility model;
fig. 2 is an exploded view of a magnetic shield structure provided by an embodiment of the present utility model;
FIG. 3 is a schematic structural diagram of a cover plate according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of an embodiment of the present utility model for embodying a multi-layered nested structure;
FIG. 5 is a schematic diagram of a parametric amplifier according to an embodiment of the present utility model mounted on a hanging board;
in the reference numerals: 10. a cover body; 11. a through hole; 12. a third mounting hole; 20. a cover plate; 21. a boss; 22. a first mounting groove; 23. a fourth mounting hole; 30. a hanging plate; 31. a first mounting hole; 32. a second mounting hole; 40. a parametric amplifier; 50. a first cover; 60. and a second cover.
Detailed Description
In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
As shown in fig. 1 and 2: the embodiment of the utility model discloses a magnetic shielding structure, which comprises a cover body 10 with one end open, a cover plate 20 and a hanging plate 30; wherein, the cover plate 20 is covered at the opening end of the cover body 10; the hanging plate 30 is positioned in the cover body 10, and the parametric amplifier 40 is arranged on the hanging plate 30; the cover 10 is provided with a through hole 11, and the through hole 11 is used for realizing electrical connection between the parametric amplifier 40 and devices outside the cover 10.
According to the magnetic shielding structure, the parametric amplifier 40 is arranged on the hanging plate 30 in the cover body 10, so that the parametric amplifier 40 is positioned in the cover body 10, then the cover plate 20 is covered on the opening end of the cover body 10, so that the parametric amplifier 40 is positioned in the relatively sealed magnetic shielding structure, the interference of an external magnetic field is avoided, and the electrical connection between the parametric amplifier 40 and devices outside the cover body 10 is realized through the arrangement of the through holes 11; in turn, allows parametric amplifier 40 (e.g., IMPA) to function properly under the external magnetic field required for quantum chip testing, while the magnetic shielding structure does not introduce thermal noise or signal disturbances.
Generally, the cover 10 may take any shape as long as the magnetic shielding effect satisfying the use requirement is achieved, including but not limited to, a cylindrical shape and a rectangular shape, preferably, the cover 10 is cylindrical, and the cylindrical magnetic shielding structure reflects magnetic flux lines more easily than the rectangular magnetic shielding structure, so that the low resistance path of the magnetic flux can be maximized, thereby making the magnetic shielding effect better.
In some embodiments of the present utility model, the through hole 11 is one of a U-shaped hole, a rectangular hole, a kidney-shaped hole, an oval hole, or a circular hole. Illustratively, as shown in fig. 2, the through hole 11 is a U-shaped hole, and by providing the through hole 11 as a U-shaped hole, both of the convenience of installation in actual use and the magnetic leakage characteristics are considered.
In general, the smaller the size of the magnetic shielding structure, the better the magnetic shielding effect, and the farther the distance between the leakage point and the parametric amplifier 40 in the magnetic shielding structure, the leakage amount is significantly reduced as the distance increases. The magnetic leakage point in the utility model can exist at two positions, namely, the position of the through hole 11 of the cover body 10 and the position of the connection of the cover body 10 and the cover plate 20; where the vias 11 are the main leakage points. Therefore, the size of the through hole 11, the size of the opening of the cover 10, the position of the parametric amplifier 40, and the like in the magnetic shielding structure affect the amount of leakage, and affect the magnetic shielding effect. To enhance the magnetic shielding effect, in some embodiments of the present utility model, the ratio of the minimum distance between the through hole 11 and the parametric amplifier 40 to the diameter of the through hole 11 is greater than 5, and, illustratively, when the through hole 11 is a circular hole, the ratio of the minimum distance between the circular hole and the parametric amplifier 40 to the diameter of the circular hole is greater than 5, and when the through hole 11 is a U-shaped hole, the ratio of the minimum distance between the U-shaped hole and the parametric amplifier 40 to the diameter of the circular arc section in the U-shaped hole is greater than 5. Further, when the cover 10 is cylindrical with one end open, the ratio of the length of the cover 10 to the diameter of the opening is greater than or equal to 4; the minimum distance between the parametric amplifier 40 and the open end of the housing 10 is greater than the opening diameter. By the arrangement, the magnetic flux leakage is reduced as much as possible and the magnetic shielding effect is improved on the premise of ensuring that the parametric amplifier 40 is installed and feasible.
In the utility model, the cover body 10 and the cover plate 20 are made of magnetic shielding materials, and when in use, the parametric amplifier 40 is positioned in the dilution refrigerator, and the magnetic shielding materials are required to have the following important characteristics at the extremely low temperature of 10-100 mK: 1) The magnetic shielding material is required to have high magnetic permeability; 2) A saturation magnetization greater than the applied ambient magnetic field strength; 3) The larger the saturation magnetic flux density is, the more the external magnetic field can be absorbed, and the better the shielding effect is; 4) The lower the coercive force is, the more easily the residual magnetic strength after shielding is reduced. Therefore, in some embodiments of the present utility model, the cover body 10 and the cover plate 20 are made of permalloy, which satisfies the above conditions, and the magnetic shielding effect is good. Further, the cover plate 20 is made of TU0 gold-plated pieces with better thermal conductivity at low temperature.
In some embodiments of the present utility model, it is also contemplated that the magnetic shielding structure may be a multi-layered nested design, i.e., a plurality of shields 10 are provided, wherein the outermost shield 10 is mainly used to reduce the external magnetic field strength (saturation magnetization is generally higher) of the working environment, and the inner shield 10 is mainly used as a weak magnetic shielding, so as to ensure that the magnetic field can fall into the range of normal operation of the parametric amplifier 40. Illustratively, as shown in fig. 4, the magnetic shielding structure includes a first housing 50 and a second housing 60 coaxially disposed, the first housing 50 and the second housing 60 each being provided with a through hole 11, and the parametric amplifier 40 being located in the second housing 60.
In some embodiments of the present utility model, the hanging plate 30 is detachably mounted on the cover plate 20, specifically, as shown in fig. 2 and 3, the hanging plate 30 includes a vertical plate and a horizontal plate which are vertically arranged, a plurality of first mounting holes 31 are formed in the horizontal plate, a plurality of first mounting grooves 22 are formed in the cover plate 20, and a screw sequentially passes through the first mounting holes 31 of the horizontal plate and the first mounting grooves 22 of the cover plate 20 to detachably connect the horizontal plate and the cover plate 20. The vertical plate is provided with a plurality of second mounting holes 32 for detachably mounting the parametric amplifier 40 to the vertical plate, as shown in fig. 2 and 5.
In some embodiments of the present utility model, the cover 10 and the cover 20 are mounted as follows: the open end of the cover body 10 extends outwards to form an ear plate, and the ear plate is detachably mounted on the cover plate 20, specifically, as shown in fig. 2 and 3, a third mounting hole 12 is formed in the ear plate, a fourth mounting hole 23 is formed in the cover plate 20, and screws sequentially penetrate through the third mounting hole 12 of the ear plate and the fourth mounting hole 23 groove of the cover plate 20 to realize detachable connection of the cover body 10 and the cover plate 20. Further, a boss 21 is disposed on a surface of the cover 20, which is close to the cover 10, and an opening end of the cover 10 is clamped on the boss 21. Through setting up boss 21 for cover body 10 card is located on boss 21, guarantees the interference zonulae occludens between cover body 10 and the apron 20, has guaranteed the magnetic continuity of whole magnetic shielding structure, can ensure the low magnetic resistance route of magnetic flux, reduces the magnetic leakage, thereby realizes best shielding effect.
Based on the same application conception, the embodiment of the utility model also provides a dilution refrigerator, which comprises a cold disc and the magnetic shielding structure, wherein the cover plate 20 of the magnetic shielding structure is detachably arranged on the cold disc.
Based on the same application conception, the embodiment of the utility model also provides a quantum computer which comprises the dilution refrigerator.
In the description of the present specification, reference to the term "some embodiments" or "examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
The foregoing is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any person skilled in the art will make any equivalent substitution or modification to the technical solution and technical content disclosed in the utility model without departing from the scope of the technical solution of the utility model, and the technical solution of the utility model is not departing from the scope of the utility model.
Claims (10)
1. A magnetic shielding structure, characterized in that: comprises a cover body with one end open, a cover plate and a hanging plate;
wherein, the cover plate is covered at the opening end of the cover body; the hanging plate is positioned in the cover body, and the parametric amplifier is arranged on the hanging plate;
the cover body is provided with a through hole, and the through hole is used for realizing the electrical connection between the parametric amplifier and a device outside the cover body.
2. The magnetic shield structure according to claim 1, characterized in that: the cover body is cylindrical.
3. The magnetic shield structure according to claim 1, characterized in that: the ratio of the minimum distance between the via and the parametric amplifier to the via diameter is greater than 5.
4. The magnetic shield structure according to claim 1, characterized in that: when the cover body is cylindrical with one end open, the ratio of the length of the cover body to the diameter of the opening is more than or equal to 4; the minimum distance between the parametric amplifier and the open end is greater than the diameter of the opening.
5. The magnetic shield structure according to claim 1, characterized in that: the cover body and the cover plate are made of permalloy.
6. The magnetic shield structure according to claim 1, characterized in that: the hanging plate is detachably arranged on the cover plate.
7. The magnetic shield structure according to claim 1, characterized in that: the open end of the cover body extends outwards to form an ear plate, and the ear plate is detachably arranged on the cover plate.
8. The magnetic shield structure according to claim 7, wherein: the cover plate is close to one side of the cover body and is provided with a boss, and the boss is clamped with the opening end of the cover body.
9. A dilution refrigerator comprising a cold plate and a magnetic shielding structure as claimed in any one of claims 1 to 8, said cover plate of said magnetic shielding structure being removably mounted to said cold plate.
10. A quantum computer comprising the dilution refrigerator of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321374137.4U CN219812420U (en) | 2023-05-31 | 2023-05-31 | Magnetic shielding structure, dilution refrigerator and quantum computer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321374137.4U CN219812420U (en) | 2023-05-31 | 2023-05-31 | Magnetic shielding structure, dilution refrigerator and quantum computer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219812420U true CN219812420U (en) | 2023-10-10 |
Family
ID=88210820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321374137.4U Active CN219812420U (en) | 2023-05-31 | 2023-05-31 | Magnetic shielding structure, dilution refrigerator and quantum computer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219812420U (en) |
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2023
- 2023-05-31 CN CN202321374137.4U patent/CN219812420U/en active Active
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