Quantum entanglement source demonstration method and system

Abstract

The invention belongs to the technical field of quantum information, and provides a quantum entanglement source demonstration method and system, and the method comprises the steps: receiving quantum entanglement photon pairs, and obtaining coincidence counting data based on the quantum entanglement photon pairs; performing relevant parameter calculation based on the coincidence counting data, and generating a three-dimensional animation playing instruction; or receiving the placing position of the optical element, and generating a three-dimensional animation playing instruction when the placing position of the optical element is consistent with the light path generated by the entanglement source; and after a three-dimensional animation playing instruction is generated, obtaining pictures at different angles in the entanglement source generation process, and respectively displaying the pictures. Linkage with suspension imaging is realized, and learners can directly participate in the design of quantum entanglement.

Description

Technical Field

[0001] The present invention belongs to the field of quantum information technology, and in particular relates to a demonstration method and system for a quantum entanglement source. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] There are many methods to generate quantum entanglement. One of them is the use of optical parametric amplification technology. This technology is based on BBO crystals or PPKTP crystals. It converts a polarized light into an optical parametric down-converter, obtains the number of entangled photons through a single-photon detector, and uses coincidence counting to characterize the phenomenon of quantum entanglement. The overall display is optoelectronic equipment such as lasers, optical elements, and detectors.

[0004] The patent with publication number CN 213781393 U and titled “A quantum entanglement teaching demonstration aid” uses a model method to demonstrate quantum entanglement, but does not have a real entanglement source generator; the patent with publication number CN 211787768 U and titled “Quantum entanglement demonstration popular science instrument” uses an electronic sensor to sense and a display to display data status to demonstrate quantum entanglement, but does not have a real entanglement source generator; the patent with publication number CN 111540037 A and titled “A real-life virtual simulation method for quantum optics teaching” and the patent with publication number CN 110428710 A. The patent named "A virtual simulation method for a quantum entanglement source" performs 3D modeling simulation based on the actual entanglement source generation device, simulating the generation process and state of the entanglement source. It has both the entanglement source generation device and the model display, and its visualization is further improved. However, the display effect is still relatively abstract, and interactive operations are not possible, which prevents learners from directly participating in the design of quantum entanglement, making it relatively difficult for learners to understand quantum entanglement. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a demonstration method and system of a quantum entanglement source. The operator can place each model at a corresponding position according to the actual optical path requirements of the entanglement source. When the optical element is consistent with the optical path of the entanglement source and the preparation model of the entanglement source is successfully established, the suspended projection display system is triggered to play a three-dimensional animation, realizing the linkage with the suspended imaging, so that learners can directly participate in the design of quantum entanglement.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A first aspect of the present invention provides a method for demonstrating a quantum entanglement source.

[0008] A method for demonstrating a quantum entanglement source, comprising:

[0009] receiving quantum entangled photon pairs, and obtaining coincidence counting data based on the quantum entangled photon pairs;

[0010] Based on the coincidence count data, relevant parameter calculations are performed and a three-dimensional animation playback instruction is generated; or, the position where the optical element is placed is received, and when the position where the optical element is placed is consistent with the optical path generated by the entanglement source, a three-dimensional animation playback instruction is generated;

[0011] After the three-dimensional animation playback instruction is generated, the images of the entanglement source generation process at different angles are obtained and displayed respectively.

[0012] Furthermore, after obtaining the coincidence counting data, the formation trajectory of the coincidence counting data and the entanglement source is displayed.

[0013] Furthermore, the position point clicked by the user is received, and when the position point is consistent with an optical element in the light path generated by the entanglement source, the parameter information and function of the optical element are displayed.

[0014] Furthermore, the related parameters include: Bell's inequality, quantum entanglement, density matrix, horizontal polarization contrast, vertical polarization contrast, entanglement matrix and polarization correlation data.

[0015] Furthermore, according to the relevant parameters and in combination with the principle of spectroscopic imaging, a three-dimensional model is constructed to obtain images of the entanglement source generation process at different angles.

[0016] Furthermore, the intensity of the entanglement source light in the picture varies with the coincidence counting data.

[0017] A second aspect of the present invention provides a demonstration system of a quantum entanglement source, comprising:

[0018] A dual-channel coincidence counter is used to receive quantum entangled photon pairs and obtain coincidence counting data based on the quantum entangled photon pairs;

[0019] A second computer is used to calculate relevant parameters based on the coincidence count data and generate a three-dimensional animation playback instruction;

[0020] The touch display integrated machine is used to receive the position where the optical element is placed, and generate a three-dimensional animation playback instruction when the position where the optical element is placed is consistent with the light path generated by the entanglement source;

[0021] The third computer is used to obtain the images of the entanglement source generation process at different angles after receiving the three-dimensional animation playback instruction generated by the second computer or the touch display integrated machine, and display them through different displays respectively.

[0022] Furthermore, it also includes a first computer and a transparent touchable display screen;

[0023] The first computer is used to obtain the formation trajectory of the entanglement source after receiving the coincidence counting data, and upload the coincidence counting data and the trajectory data of the entanglement source to the transparent touch screen for display.

[0024] Furthermore, the transparent touch display screen is used to receive a location point clicked by a user, and when the location point is consistent with an optical element in the light path generated by the entanglement source, the parameter information and function of the optical element are displayed.

[0025] Furthermore, the related parameters include: Bell's inequality, quantum entanglement, density matrix, horizontal polarization contrast, vertical polarization contrast, entanglement matrix and polarization correlation data.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The operator of the present invention can place each model at a corresponding position according to the actual optical path requirements of the entanglement source. When the optical element is consistent with the optical path of the entanglement source and the preparation model of the entanglement source is successfully established, the suspension projection display system is triggered to play the three-dimensional animation, thereby realizing the linkage with the suspension imaging.

[0028] The present invention allows observers or learners to participate in the actual process of quantum entanglement. Through interactive operation steps, they can personally experience the mechanism of entanglement, which makes it convenient for learners to directly participate in the design of quantum entanglement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0030] Figure 1 is a flow chart of a method for demonstrating a quantum entanglement source shown in Embodiment 1 of the present invention;

[0031] Figure 2 is a connection diagram of various devices shown in Embodiment 1 of the present invention;

[0032] Figure 3 It is a structural diagram of each device shown in the first embodiment of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0036] Embodiment 1

[0037] This embodiment provides a method for demonstrating a quantum entanglement source.

[0038] This embodiment provides a method for demonstrating a quantum entanglement source, such as Figure 1 As shown, the following steps are included:

[0039] receiving quantum entangled photon pairs, and obtaining coincidence counting data based on the quantum entangled photon pairs;

[0040] Based on the coincidence count data, relevant parameter calculations are performed and a three-dimensional animation playback instruction is generated; or, the position where the optical element is placed is received, and when the position where the optical element is placed is consistent with the optical path generated by the entanglement source, a three-dimensional animation playback instruction is generated;

[0041] After the three-dimensional animation playback instruction is generated, the images of the entanglement source generation process at different angles are obtained and displayed respectively.

[0042] like Figure 2As shown, when the start button 2 is pressed, all devices are powered on and initialized. After power-on, the laser 1 with a wavelength of 405nm outputs blue-violet light with a central wavelength of 405nm and an average power of more than 5mw; the blue-violet light output by the laser 1 with a wavelength of 405nm enters the PPKTP entanglement source generation optical path 3. The core optical device of the PPKTP entanglement source generation optical path 3 is a periodically polarized potassium titanyl phosphate (PPKTP for short) crystal, which generates quantum entangled photon pairs with a wavelength of 810nm after optical parametric down-conversion. The generated quantum entangled source photon pairs have the advantages of high brightness and high polarization contrast. The PPKTP entanglement source generation optical path 3 is a prior art. For example, the relevant content can be found in "Experimental Research on Free Space Quantum Communication" ([D] Yin Juan, University of Science and Technology of China, 2009), which will not be repeated here. The quantum entangled photon pairs generated by the PPKTP entangled source generating optical path 3 enter the dual-channel coincidence counter 6. The dual-channel coincidence counter 6 contains two single-photon detectors, which can simultaneously collect two single-photon signals to obtain coincidence counting data, which is uploaded to the first computer 5 via serial communication means and displayed on the transparent touch display 4.

[0043] Among them, the transparent touch display screen 4 has the functions of transparency, display and touchability. It can mainly display the formation trajectory of the entanglement source in real time, and can click on any position point of the formation trajectory. When the position point is consistent with the optical element in the PPKTP entanglement source generating light path 3, the transparent touch display screen 4 will display the parameter information and function of the optical element (such as PPKTP crystal), which is convenient for the operator to learn and understand.

[0044] The dual-channel coincidence counter 6 is also connected to a second computer 7 , and the second computer 7 is also connected to a touch screen 8 .

[0045] After receiving the quantum entangled photon pair, the dual-channel coincidence counter 6 obtains coincidence counting data; the second computer 7 is used to calculate the Bell inequality, quantum entanglement degree, density matrix, horizontal polarization contrast, vertical polarization contrast, entanglement degree matrix, polarization correlation data and other calculation results after receiving the coincidence counting data, and display them through the touch screen 8, generate a three-dimensional animation playback instruction, and upload the three-dimensional animation playback instruction to the third computer 9.

[0046] When the dual-channel coincidence counter 6 collects entangled photon pair data, the dual-channel coincidence counter 6 transmits it to the second computer 7 through serial port communication. The second computer 7 acquires the data and performs relevant calculations, including Bell's inequality, entanglement degree, density matrix, polarization contrast, polarization correlation data, etc., and displays the relevant data of the calculation results in the form of numerical values, curves, three-dimensional graphics, etc. through the touch screen 8.

[0047] Since wave plates with different rotation angles affect the results of entangled photons, the computer software in the second computer 7 can control the rotation and fluctuation angles of the half-wave plate, quarter-wave plate, and polarization plate in the PPKTP entanglement source generation optical path 3 to achieve the upper and lower linkage function. The more coincidence counting data collected, the higher the entanglement degree, and the brighter the entanglement source light intensity in the suspended imaging screen.

[0048] The quantum entanglement source three-dimensional suspension projection display system is composed of a third computer 9, a first display 12, a second display 14, a third display 16, a fourth display 18, a first suspension imaging glass 13, a second suspension imaging glass 15, a third suspension imaging glass 17 and a fourth suspension imaging glass 19. The third computer 9 is connected to the second computer 7, and the first display 12, the second display 14, the third display 16 and the fourth display 18 are connected to the third computer 9 respectively.

[0049] The glass 13 used for the first suspended imaging, the glass 15 used for the second suspended imaging, the glass 17 used for the third suspended imaging and the glass 19 used for the fourth suspended imaging form an inverted prism.

[0050] After receiving the three-dimensional animation playback instruction, the third computer 9 obtains images of the model of the entanglement source generation process at four angles according to the calculation results of the second computer 7.

[0051] After receiving the first angle image, the second angle image, the third angle image and the fourth angle image respectively, the first display 12, the second display 14, the third display 16 and the fourth display 18 display and project them onto the first suspended imaging glass 13, the second suspended imaging glass 15, the third suspended imaging glass 17 and the fourth suspended imaging glass 19 respectively.

[0052] The third computer 9 obtains the coincidence count, entanglement degree, density matrix and other data calculated by the second computer 7, and dynamically changes different frames according to the actual operation of the entanglement source (entanglement source generation) process. Based on the principle of spectroscopic imaging, a three-dimensional model is constructed for software processing to obtain different angles of the entanglement source generation process (four angles of images), and send them to each display respectively.

[0053] The first display 12, the second display 14, the third display 16 and the fourth display 18 are used to play pictures of different angles of the entanglement source generation process, and the glass 13 used for the first suspended imaging, the glass 15 used for the second suspended imaging, the glass 17 used for the third suspended imaging and the glass 19 used for the fourth suspended imaging are used to project the pictures played by the first display 12, the second display 14, the third display 16 and the fourth display 18 respectively.

[0054] Through the first suspended imaging glass 13, the second suspended imaging glass 15, the third suspended imaging glass 17 and the fourth suspended imaging glass 19, the image of the quantum entanglement source generation process is suspended in the mid-air of the real scene, creating an atmosphere that is both real and illusory, with a strong sense of depth, showing the mystery of the microscopic world; and the entanglement brightness changes according to the number of entangled photon pairs. The image played by the display is located at the bottom of the suspended imaging glass, which is transparent. The observer stands on the same horizontal plane as the shell, and the best viewing angle is to look up.

[0055] The third computer 9 is also connected to a touch display all-in-one machine 10, and the touch display all-in-one machine 10 is also connected to a player 11. The player is equivalent to a stereo, and is used to play the sound of the entanglement source teaching promotional film.

[0056] The touch display integrated machine 10 is used to run comprehensive display software such as a teaching promotional video on quantum entanglement and an interactive game on the operation mechanism of quantum entanglement. The teaching promotional video uses animation with sound to explain, which is vivid and vivid.

[0057] The interactive game of quantum entanglement operation mechanism is developed based on unity software. First, three-dimensional modeling is performed for each optical element in the optical path 3 of the PPKTP entanglement source. The operator places each model in the corresponding position according to the actual optical path requirements of the entanglement source. When the optical element is consistent with the optical path of the entanglement source and the preparation model of the entanglement source is successfully established, the touch display integrated machine 10 uploads the three-dimensional animation playback instruction to the third computer 9 to trigger the quantum entanglement source three-dimensional suspension projection display system to play the three-dimensional animation of the quantum entanglement source generation process. Each display pre-stores the corresponding pictures of the quantum entanglement source generation process animation, and the three-dimensional suspension imaging display of the quantum entanglement source generation process animation can also be realized through the glass used for each suspension imaging.

[0058] The second computer 7 and the third computer 9 constitute a computing device.

[0059] like Figure 2 As shown, the start button 2 is used to connect the power supply to each computer, the laser 1 with a wavelength of 405nm, the dual-channel coincidence counter 6, the touch screen 8, the transparent touch screen 4, the touch display all-in-one machine 10, each display, the player 11, etc. For the sake of simplicity and clarity, Figure 2 The corresponding connection lines are given in the figure. The start button 2 is equivalent to the main power switch, which is connected to the short-circuit protector inside the shell and is used to control the power supply of all devices in the shell. When the start button 2 is pressed, all devices are powered on and initialized.

[0060] A laser 1 with a wavelength of 405 nm, a PPKTP entanglement source generating optical path 3, a dual-channel coincidence counter 6, a first computer 5 and a transparent touch display screen 4 are connected in sequence.

[0061] The laser 1 with a wavelength of 405 nm is used to output blue-violet light with a central wavelength of 405 nm and an average power of 5 mW or more.

[0062] The PPKTP entanglement source generating optical path 3 is used to generate quantum entangled photon pairs with a wavelength of 810nm after receiving blue-violet light.

[0063] The dual-channel coincidence counter 6 is used to receive quantum entangled photon pairs, that is, to receive each single photon signal in the optical path 3 generated by the PPKTP entangled source, and detect and calculate the coincidence counting data accordingly; the first computer 5 is used to receive the data of the dual-channel coincidence counter 6, obtain the formation trajectory of the entanglement source, and display it through the transparent touch screen 4.

[0064] like Figure 3 As shown, the demonstration device of the quantum entanglement source includes a housing, which is a trapezoidal housing. A window is provided on the first side of the housing for setting a transparent touch screen 4; a window and a through hole are provided on the second side of the housing for setting a touch screen 8 and a start button 2 respectively; and two windows are provided on the third side of the housing for setting a touch display all-in-one machine 10 and a player 11 (not shown in the figure).

[0065] A laser 1 with a wavelength of 405 nm, a PPKTP (Periodically Polarized Potassium Titanyl Phosphate, Periodically Poled KTP) entanglement source generating optical path 3, a first computer 5, a dual-channel coincidence counter 6, a second computer 7, and a third computer 9 are all arranged inside the housing.

[0066] Baffles are fixedly connected to the top surface of the shell on all four sides, and the baffles are perpendicular to the top surface of the shell. The first display 12, the second display 14, the third display 16, and the fourth display 18 are arranged on the top surface of the shell and are parallel to the top surface of the shell.

[0067] The baffles around the top of the shell are perpendicular to the plane where the display is located, in order to block the line of sight of people and prevent them from directly seeing the display screen, which would affect the viewing effect of suspended imaging. The angle between the glass used for suspended imaging and the plane where the display is located is controlled between 30° and 75°, and the imaging effect is good.

[0068] The first suspended imaging glass 13, the second suspended imaging glass 15, the third suspended imaging glass 17 and the fourth suspended imaging glass 19 form an inverted prism and are arranged on the top of the shell. The positions of the first suspended imaging glass 13, the second suspended imaging glass 15, the third suspended imaging glass 17 and the fourth suspended imaging glass 19 correspond to the first display 12, the second display 14, the third display 16 and the fourth display 18 respectively.

[0069] This embodiment provides a method for demonstrating a quantum entanglement source, which can observe the running trajectory of the light path in real time through a transparent touch screen.

[0070] The present embodiment provides a method for demonstrating a quantum entanglement source, which uses three-dimensional animation to simulate the process of generating quantum entanglement. By displaying the three-dimensional suspended imaging animation process, the process of generating quantum entanglement is displayed more vividly and intuitively, which is easy to understand.

[0071] The demonstration method of a quantum entanglement source provided in this embodiment can enable observers or learners to participate in the actual process of quantum entanglement. Through interactive operation steps, they can personally experience the mechanism of entanglement, which can facilitate learners to directly participate in the design of quantum entanglement.

[0072] This embodiment provides a demonstration method for a quantum entanglement source, in which the preparation state of the entanglement source can be linked with the suspension imaging in real time, and the entanglement degree can be represented by the brightness of the suspension imaging entangled light spot.

[0073] The present embodiment provides a method for demonstrating a quantum entanglement source. When a preparation model of the entanglement source is successfully established, the suspension projection display system can also be triggered to play a three-dimensional animation, which is linked with the suspension imaging.

[0074] Embodiment 2

[0075] This embodiment provides a demonstration system of a quantum entanglement source, which specifically includes:

[0076] A dual-channel coincidence counter is used to receive quantum entangled photon pairs and obtain coincidence counting data based on the quantum entangled photon pairs;

[0077] A second computer is used to calculate relevant parameters based on the coincidence count data and generate a three-dimensional animation playback instruction;

[0078] The touch display integrated machine is used to receive the position where the optical element is placed, and generate a three-dimensional animation playback instruction when the position where the optical element is placed is consistent with the light path generated by the entanglement source;

[0079] The third computer is used to obtain the images of the entanglement source generation process at different angles after receiving the three-dimensional animation playback instruction generated by the second computer or the touch display integrated machine, and display them through different displays respectively.

[0080] Also included is a first computer and a transparent touchable display screen;

[0081] The first computer is used to obtain the formation trajectory of the entanglement source after receiving the coincidence counting data, and upload the coincidence counting data and the trajectory data of the entanglement source to the transparent touch screen for display.

[0082] The transparent touch display screen is used to receive the position point clicked by the user. When the position point is consistent with an optical element in the light path generated by the entanglement source, the parameter information and function of the optical element are displayed.

[0083] It should be noted here that the various modules in this embodiment correspond to the relevant descriptions in Embodiment 1, and the specific implementation processes are the same, which will not be repeated here.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for demonstrating a quantum entanglement source, characterized in that: include: receiving quantum entangled photon pairs, and obtaining coincidence counting data based on the quantum entangled photon pairs; Based on the coincidence count data, relevant parameter calculations are performed and 3D animation playback instructions are generated; Alternatively, receiving the position where the optical element is placed, and when the position where the optical element is placed is consistent with the light path generated by the entanglement source, generating a three-dimensional animation playback instruction; After the three-dimensional animation playback instruction is generated, the images of the entanglement source generation process at different angles are obtained and displayed respectively.

2. The method for demonstrating a quantum entanglement source according to claim 1, characterized in that: After obtaining the matching counting data, the formation trajectory of the matching counting data and the entanglement source is displayed.

3. The method for demonstrating a quantum entanglement source according to claim 2, characterized in that: The position point clicked by the user is received, and when the position point is consistent with an optical element in the optical path generated by the entanglement source, the parameter information and function of the optical element are displayed.

4. The method for demonstrating a quantum entanglement source according to claim 1, characterized in that: The related parameters include: Bell's inequality, quantum entanglement degree, density matrix, horizontal polarization contrast, vertical polarization contrast, entanglement degree matrix and polarization correlation data.

5. The method for demonstrating a quantum entanglement source according to claim 1, characterized in that: According to the relevant parameters and in combination with the imaging principle of the spectroscope, a three-dimensional model is constructed to obtain images of the entanglement source generation process at different angles.

6. The method for demonstrating a quantum entanglement source according to claim 5, characterized in that: The intensity of the entangled source light in the picture changes with the coincidence counting data.

7. A demonstration system of a quantum entanglement source, characterized in that: include: A dual-channel coincidence counter is used to receive quantum entangled photon pairs and obtain coincidence counting data based on the quantum entangled photon pairs; A second computer is used to calculate relevant parameters based on the coincidence count data and generate a three-dimensional animation playback instruction; The touch display integrated machine is used to receive the position where the optical element is placed, and generate a three-dimensional animation playback instruction when the position where the optical element is placed is consistent with the light path generated by the entanglement source; The third computer is used to obtain the images of the entanglement source generation process at different angles after receiving the three-dimensional animation playback instruction generated by the second computer or the touch display integrated machine, and display them through different displays respectively.

8. The demonstration system of the quantum entanglement source according to claim 7, characterized in that: Also included is a first computer and a transparent touchable display screen; The first computer is used to obtain the formation trajectory of the entanglement source after receiving the coincidence counting data, and upload the coincidence counting data and the trajectory data of the entanglement source to the transparent touch screen for display.

9. The demonstration system of the quantum entanglement source according to claim 8, characterized in that: The transparent touch display screen is used to receive a location point clicked by a user, and when the location point is consistent with an optical element in the light path generated by the entanglement source, the parameter information and function of the optical element are displayed.

10. The demonstration system of the quantum entanglement source according to claim 7, characterized in that: The related parameters include: Bell's inequality, quantum entanglement degree, density matrix, horizontal polarization contrast, vertical polarization contrast, entanglement degree matrix and polarization correlation data.

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