CN111465306B

CN111465306B - Filtering shielding device and quantum processing system for preventing stray light interference

Info

Publication number: CN111465306B
Application number: CN202010334671.7A
Authority: CN
Inventors: 孙骏逸; 熊康林; 陆晓鸣; 黄永丹; 冯加贵; 武彪; 丁孙安
Original assignee: Suzhou Institute of Nano Tech and Nano Bionics of CAS
Current assignee: Suzhou Institute of Nano Tech and Nano Bionics of CAS
Priority date: 2020-04-24
Filing date: 2020-04-24
Publication date: 2023-03-24
Anticipated expiration: 2040-04-24
Also published as: CN111465306A

Abstract

The invention provides a filtering shielding device and a quantum processing system for preventing stray light interference, wherein the filtering shielding device comprises a filtering shielding shell which surrounds and forms an internal containing space, the filtering shielding shell comprises a first polarization layer and a second polarization layer which are arranged in a laminated mode, and the polarization direction of the first polarization layer is perpendicular to the polarization direction of the second polarization layer. The filtering shielding device realizes the shielding effect on stray light based on the polarization filtering principle, is particularly effective for infrared stray light interference of a quantum circuit, is different from the prior technical scheme of arranging a stray light absorbing material layer, and the polarization layer does not need to improve the shielding effect in a mode of increasing the thickness, so that the increase of the whole volume of the circuit is avoided; the filter shielding device is relatively independent from the accommodating object in the internal accommodating space, and a shielding layer does not need to be arranged on the surface of the line through processes such as coating and the like, so that the line is prevented from being directly influenced, and the filter shielding device can be applied to directly shielding most components.

Description

Filtering shielding device and quantum processing system for preventing stray light interference

Technical Field

The invention relates to the technical field of stray light shielding of circuits, in particular to a filtering shielding device and a quantum processing system for preventing stray light interference.

Background

In the working environment around the line architecture formed by the components and the transmission cables, there often exists stray interfering light, so that the components and the transmission cables are susceptible to the influence of the stray light. For example, in a low-temperature superconducting quantum line or a low-temperature superconducting quantum-related system, stray light with large interference is mainly infrared stray light, the low-temperature superconducting quantum cable and the qubit superconducting device absorb the infrared stray light to generate quasi-particles, and the quasi-particles can damage the cooper pair in the qubit superconducting device and the low-temperature superconducting quantum cable, the coherence of the low qubit and the quality factor of the resonator, so that the performance of the low-temperature superconducting quantum cable and the qubit superconducting device is reduced.

In order to improve the performance of the low-temperature superconducting quantum cable and the qubit superconducting device, the performance of the superconducting low-temperature superconducting quantum circuit is generally improved by shielding the infrared stray light and further preventing the interference of the low-temperature superconducting quantum cable and the qubit superconducting device. In the conventional scheme in the prior art, the infrared filters arranged outside the components and the cable are made of infrared absorption medium materials, and the chip container shell is coated with infrared absorption coating, namely, the problems are solved in a mode of absorbing infrared stray light. However, the attenuation amount of the infrared stray light or the effect of absorbing the infrared stray light depends on the thickness of the infrared absorption material layer, and the thickness of the infrared absorption material layer needs to be large enough to ensure that the infrared stray light basically does not affect internal devices and cables, so that the occupied space of a line with the additional infrared absorption material layer is often too large, and the development of application fields such as quantum computation and information processing based on quantum lines is greatly limited.

Therefore, there is a need for further improvements to address the problem of stray light in the system interfering with the devices and cables.

Disclosure of Invention

In view of the above, in order to solve the above problems, the present invention adopts the following technical solutions:

the invention provides a filtering shielding device which comprises a filtering shielding shell which surrounds to form an internal containing space, wherein the filtering shielding shell comprises a first polarization layer and a second polarization layer which are arranged in a laminated mode, and the polarization direction of the first polarization layer is perpendicular to the polarization direction of the second polarization layer.

Preferably, the first and second polarizing layers are infrared band polarizing material layers.

Preferably, the filter shield housing is a polyhedron, and a plurality of faces of the filter shield housing are distributed around a center line of the internal accommodating space to form a prism-shaped side face structure.

Preferably, the filtering and shielding device further comprises a protective shell located in the internal accommodating space, the protective shell covers the content which is used for accommodating the internal accommodating space, supporting legs are formed on the protective shell in an extending mode, and the supporting legs are connected to the inner wall, back to the first polarization layer, of the second polarization layer.

Preferably, when the filtering shielding shell is a polyhedron, the connection point between the supporting leg and the inner wall of the second polarization layer is located between two adjacent faces of the filtering shielding shell.

Preferably, the protective housing is of a cylindrical structure, and a line connecting hole is formed in the side face of the protective housing.

Preferably, the inner receiving space is used for receiving a quantum wire.

Preferably, the quantum wire comprises a low temperature superconducting quantum cable and a qubit superconducting device.

The invention also provides a quantum processing system for preventing stray light interference, which comprises the filtering shielding device and a quantum circuit accommodated in the internal accommodating space of the filtering shielding device.

Compared with the prior art, the invention has the beneficial effects that: based on the arrangement that the first polarization layer and the second polarization layer which are perpendicular to each other in polarization direction are used as the filtering shielding shell, the stray light shielding effect outside the filtering shielding shell is achieved by utilizing the polarization filtering principle, the working principle of the polarization layer is different from that of a stray light absorbing material, the filtering shielding device is relatively independent of a containing object in an internal containing space, the polarization layer does not need to improve the shielding effect in a thickness increasing mode, and the occupied space cannot be increased due to the fact that the shielding effect needs to be improved.

Drawings

Fig. 1 is a schematic structural diagram of a filter shielding apparatus according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram corresponding to another embodiment of the filtering and shielding device.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the accompanying drawings. The embodiments of the invention shown in the drawings and described in accordance with the drawings are exemplary only, and the invention is not limited to these embodiments.

It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps that are closely related to the solution according to the present invention are shown in the drawings, and other details that are not relevant are omitted.

As shown in fig. 1, the present invention provides a filter shield apparatus, which includes a filter shield case 1 enclosing an inner receiving space 10. The filtering and shielding housing 1 comprises a first polarization layer 11 and a second polarization layer 12 which are stacked, wherein the polarization direction of the first polarization layer 11 is perpendicular to the polarization direction of the second polarization layer 12.

The filter shielding device provided by the invention is characterized in that the first polarization layer 11 and the second polarization layer 12 with mutually perpendicular polarization directions are arranged as the filter shielding shell 1, only the light waves with the vibration directions parallel to the polarization directions can pass through the polarization layers formed by the polaroids and the polarization crystals, when the light outside the first polarization layer 11 enters the first polarization layer 11, only the light waves vibrating along the polarization directions parallel to the first polarization layer 11 can pass through the polarization layers, and the light waves passing through the first polarization layer 11 cannot pass through the first polarization layer 12 because the polarization directions of the second polarization layer 12 are mutually perpendicular to the polarization directions of the first polarization layer 11. With this principle, after the devices and cables, etc. that need to shield the external stray light interference are accommodated in the inner accommodating space 10 of the filter shielding apparatus, the external stray light is shielded by the filter shielding case 1 including the first polarization layer 11 and the second polarization layer 12, so as to prevent the interference.

Compared with the scheme that infrared filters arranged outside components and cables are made of infrared absorption medium materials, and infrared absorption coatings are coated on a chip container shell to absorb infrared stray light in the prior art, in the filtering and shielding device provided by the invention, the first polarization layer 11 and the second polarization layer 12 do not need to be increased in thickness to improve the shielding effect, and the occupied space is not wasted for improving the shielding effect; the filter shielding device is relatively independent from the accommodating objects in the inner accommodating space 10, material layers do not need to be added on the surfaces of the device and the cable through coating and other processes, direct influence on the device and the cable is avoided, the contents in the inner accommodating space 10 can be replaced, and therefore the filter shielding device can directly shield most of components and parts, and shielding of the whole circuit is achieved more effectively.

Exemplarily, in the present embodiment, the internal receiving space 10 is used to receive a quantum wire. The quantum-based circuit has a huge application prospect, for example, the development of application fields such as quantum computation and information processing, wherein the interference caused by stray light is a big problem for limiting the development, and the solution of the problem by the invention can make a contribution to the development of the subsequent field. In this embodiment, the quantum wires accommodated in the internal accommodation space 10 include a low-temperature superconducting quantum cable and a qubit superconducting device.

In the low-temperature superconducting quantum line or the low-temperature superconducting quantum-related system, the stray light with large interference is mainly infrared stray light, so for example, in order to solve the influence of the infrared stray light on the quantum line, in the present embodiment, the first polarization layer 11 and the second polarization layer 12 are provided as infrared band polarization material layers.

Further, the filter shield case 1 is a polyhedron, and a plurality of faces of the filter shield case 1 are distributed around the center line 101 of the internal accommodating space 10 to form a prism-shaped side face structure. Based on the fact that the actual polarization layer is not an ideal polarization layer, the filtering shielding case 1 may be configured as a polyhedron with two or more layers, and the more the number of the configured surfaces is, the better the shielding effect is. As shown in fig. 1, the filter shield case 1 in the embodiment of the present invention is exemplarily configured as a hexagonal prism-shaped side structure, and is rotationally symmetrically distributed around a center line 101 of the inner accommodating space 10.

As another embodiment of the filter shielding apparatus provided by the present invention, the filter shielding apparatus further includes a protective shell 2 located in the internal accommodating space 10, the protective shell 2 covers the content accommodated in the internal accommodating space 10, a supporting leg 21 is formed on the protective shell 2 in an extending manner, and the supporting leg 21 is connected to the inner wall 12a of the second polarization layer 12 facing away from the first polarization layer 11. Generally, in the field, devices and cables, especially quantum wires, have requirements for the working environment, and therefore, the protective housing 2 is generally disposed outside the wires, and the supporting legs 21 are extended and formed by the protective housing 2 to be connected to the second polarization layer 12, so that the filtering and shielding housing 1 can be fixed, and the filtering and shielding housing 1 is stably mounted on the periphery of the quantum wires to be protected.

Specifically, the protective housing 2 is a cylindrical structure, the protective housing 2 is rotationally symmetric about a central line 101 of the internal accommodating space 10, and a line connecting hole 20 is formed in a side surface 2a of the protective housing 2. Thus, the cables housed in the protective case 2 can extend through the cable connection holes 20 on the side surface 2a of the protective case 2, and external transmission connection is realized.

Illustratively, when the filter shield housing 1 is a polyhedron, the connection point between the supporting leg 21 and the inner wall 12a of the second polarization layer 12 is located between two adjacent faces of the filter shield housing 1. For the polyhedron, the boundary between two adjacent surfaces is a relatively stable position, and a plurality of connection points between the supporting legs 21 and the inner wall 12a of the second polarization layer 12 are all arranged at the position, so that the structural stability of the filtering and shielding device is further improved.

With reference to fig. 2, the present invention further provides a quantum processing system for preventing stray light interference, including the filtering and shielding device and the quantum wires accommodated in the internal accommodating space of the filtering and shielding device.

In summary, based on the principle of polarization filtering, the filtering and shielding device and the stray light interference prevention quantum processing system provided by the present invention are configured such that the first polarization layer 11 and the second polarization layer 12 with mutually perpendicular polarization directions are stacked to form the filtering and shielding case 1, and the filtering and shielding case 1 surrounds to form the internal accommodating space 10 for accommodating the contents to be isolated from the external stray light, so that after the devices and cables, etc. which need to shield the external stray light interference, are accommodated in the internal accommodating space 10 of the filtering and shielding device, the external stray light is shielded by the filtering and shielding case 1 including the first polarization layer 11 and the second polarization layer 12, thereby preventing the interference, and the first polarization layer 11 and the second polarization layer 12 do not need to increase the thickness to improve the shielding effect, and do not waste the occupied space; the filter shielding device is relatively independent from the accommodating objects in the inner accommodating space 10, material layers do not need to be added on the surfaces of the device and the cable through coating and other processes, direct influence on the device and the cable is avoided, the contents in the inner accommodating space 10 can be replaced, and therefore the filter shielding device can directly shield most of components and parts, and shielding of the whole circuit is achieved more effectively.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is illustrative of the present disclosure and it will be appreciated by those skilled in the art that changes may be made in this embodiment without departing from the principles of the disclosure, the scope of which is defined by the appended claims.

Claims

1. A filtering and shielding device is characterized by comprising a filtering and shielding shell (1) which surrounds and forms an inner containing space (10), wherein the filtering and shielding shell (1) comprises a first polarization layer (11) and a second polarization layer (12) which are arranged in a laminated mode, and the polarization direction of the first polarization layer (11) is perpendicular to the polarization direction of the second polarization layer (12); the first polarizing layer (11) and the second polarizing layer (12) are infrared band polarizing material layers; the inner receiving space (10) is used for receiving quantum wires.

2. The filter shielding device according to claim 1, characterized in that the filter shielding housing (1) is a polyhedron, a plurality of faces of the filter shielding housing (1) being distributed around a center line (101) of the inner receiving space (10), forming a prism-like, side-like structure.

3. The filtering and shielding device according to claim 1, further comprising a protective shell (2) located in the inner accommodating space (10), wherein the protective shell (2) covers contents accommodated in the inner accommodating space (10), a supporting leg (21) extends from the protective shell (2), and the supporting leg (21) is connected to an inner wall (12 a) of the second polarization layer (12) facing away from the first polarization layer (11).

4. The filtering and shielding device according to claim 3, characterized in that, when said filtering and shielding case (1) is a polyhedron, the connection point between said supporting feet (21) and the inner wall (12 a) of said second polarizing layer (12) is located between two adjacent faces of said filtering and shielding case (1).

5. The filtering and shielding device according to claim 3, characterized in that the protective shell (2) is a cylindrical structure, and a line connection hole (20) is formed on a side surface (2 a) of the protective shell (2).

6. The filter shielding device of claim 1, wherein said quantum wire comprises a low temperature superconducting quantum cable and a qubit superconducting device.

7. A quantum processing system for preventing stray light interference, comprising the filter shielding device of any one of claims 1 to 6 and a quantum wire accommodated in an inner accommodating space of the filter shielding device.