A quantum-safe video surveillance device

Abstract

The present invention belongs to the field of video surveillance security technology, and discloses a quantum security video surveillance device, including a video acquisition module, an image processing module, an analog-to-digital conversion module, a processing chip, a key pool, a security chip, and an optical quantum entropy source chip, wherein the optical quantum entropy source chip is used to convert laser phase quantum noise into a light intensity fluctuation signal through an unequal-arm interferometer, and then convert it into an electrical signal; the number of unequal-arm interferometers is at least 2; all unequal-arm interferometers share a long delay waveguide; the delay difference between the long and short arms of the unequal-arm interferometer is equal to n / f. Compared with the prior art, the present invention proposes to ensure the security of the device by integrating a quantum random number chip and encrypting video data using a quantum key. By sharing the interferometer long delay waveguide in the optical quantum entropy source chip, the space occupied by the delay waveguide is reduced, the integration of the chip and the random number generation rate are improved, and the integration and security of the device are improved.

Description

Technical Field

[0001] The present invention relates to the field of video surveillance security technology, and in particular to a quantum security video surveillance device. Background Art

[0002] Video surveillance systems are widely used in security monitoring, smart cities, intelligent transportation and other fields. The importance of ensuring the security of video surveillance data is self-evident. At present, there are two main forms of attacks on video surveillance data: one is to steal video information during video data transmission; the other is to steal video information from video acquisition or storage devices. Traditional solutions usually set user permissions for security authentication and use classic encryption algorithms to encrypt video data. However, there are problems such as simple authentication algorithms and easy to crack. Especially in the face of the threat of quantum computers, there are still security risks.

[0003] In order to enhance the security of video surveillance, people have introduced quantum technology, especially the use of quantum random numbers to authenticate or encrypt video data. This is because quantum random numbers are based on the principles of quantum mechanics, and use the inherent unpredictable randomness of quantum to generate quantum random numbers with true randomness and security. The encryption key generated by quantum random numbers through a specific algorithm or protocol has a high degree of true randomness and security, and can provide video surveillance systems with more secure and efficient administrator authority authentication and data encryption services. For example, patents CN117641046A and CN115225263A use quantum keys generated by quantum random number generators for identity authentication and encrypt video data to ensure the security of video data transmission. However, this method directly adds the quantum random number generator to the video surveillance system, which increases the size and complexity of the system on the one hand, and cannot guarantee the security of the video acquisition end on the other. Patent CN213426286U chips the quantum random number generator and places it in the camera, which can ensure the security of the video data output by the camera. However, the quantum random number chip in this solution is still an independent device, and the main control module is required to control the video acquisition module and the encryption module at the same time, and no integrated design is performed. With the increasing miniaturization of video surveillance equipment and the widespread use of high-definition cameras, the amount of video data generated in real time is very large, which puts high demands on the random number generation rate and encryption processing.

[0004] At present, the quantum random number generator based on laser phase fluctuation has a high random number generation rate. Generally, the phase fluctuation of continuous light is converted into light intensity fluctuation as a quantum entropy source through an unequal-arm interferometer (such as the chip-based MZ interferometer used in patent CN106843804A), but the phase difference between the long and short arms of the interferometer needs to be controlled at π / 2, which increases the complexity of the system. Patent CN113934400A uses pulsed light and does not require a stable phase, but requires a longer arm length difference to match the repetition rate of the pulse. Limited by the minimum bending radius of the waveguide, the delay waveguide occupies a large volume. If the quantum entropy source part is array-integrated to increase the rate exponentially, the chip volume will also increase exponentially. Since the long arm of the unequal-arm MZ interferometer is provided with a longer delay waveguide, when integrating two quantum entropy sources, two MZ interferometers containing long delay waveguides need to be arranged in parallel, which greatly increases the size of the chip and is difficult to integrate with the camera. Summary of the invention

[0005] In view of the above defects in the prior art, the present invention proposes a quantum security video monitoring device.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A quantum security video monitoring device, comprising:

[0008] The video acquisition module is used to convert the received optical signal into an electrical signal and perform image acquisition to obtain the original image data;

[0009] The image processing module ISP is used to process the original image data into real image data through the image signal processing algorithm;

[0010] Photon entropy source chip, used to convert laser phase quantum noise into light intensity fluctuation signal through unequal-arm interferometer, and then convert it into electrical signal;

[0011] The number of the unequal-arm interferometers is at least 2; all unequal-arm interferometers share a long-delay waveguide; the delay difference between the long and short arms of the unequal-arm interferometers is equal to n / f, where n is a positive integer and f is a frequency;

[0012] The analog-to-digital conversion module ADC is used to convert the electrical signal generated by the photon entropy source chip into a digital signal to generate an original random number;

[0013] The processing chip SOC is used to perform video encoding on real image data to obtain video data; it is also used to extract randomness from the original random number through a post-processing algorithm to obtain a quantum true random number;

[0014] Key pool, used to store quantum true random numbers;

[0015] The security chip is used to call the quantum true random number in the key pool and convert it into a quantum key, encrypt the video data, and output the encrypted video data.

[0016] Preferably, the optical quantum entropy source chip comprises at least two identical lasers, at least two photodetectors and a PLC waveguide for hybrid integration;

[0017] The laser is used to generate an optical pulse signal with a repetition frequency of f and a random phase;

[0018] The PLC waveguide comprises at least two unequal-arm interferometers each having two ports; each of the unequal-arm interferometers shares at least one long-delay waveguide;

[0019] The photoelectric detectors are all the same and are used to detect the interference light intensity of the unequal-arm interferometer;

[0020] The number of lasers, photodetectors, and unequal-arm interferometers in the PLC waveguide are equal;

[0021] A laser and a photodetector are connected to two ports of an unequal-arm interferometer through a lens or a pattern conversion module respectively.

[0022] Preferably, the optical quantum entropy source chip includes a first laser LD1, a second laser LD2, a first photodetector PD1, a second photodetector PD2, and a PLC waveguide.

[0023] The PLC waveguide includes a first beam splitter BS1, a second beam splitter BS2, a polarization beam splitter first polarization beam splitter PBS1, and a second polarization beam splitter PBS2;

[0024] The first laser LD1 and the first photodetector PD1 are respectively connected to two input ports of the first beam splitter BS1;

[0025] The second laser LD2 and the second photodetector PD2 are respectively connected to two input ports of the second beam splitter BS2;

[0026] Two output ports of the first beam splitter BS1 are respectively connected to an input port of the first polarization beam splitter PBS1 and an input port of the second polarization beam splitter PBS2 through waveguides of equal length;

[0027] Two output ports of the second beam splitter BS2 are connected to another input port of the first polarization beam splitter PBS1 and another input port of the second polarization beam splitter PBS2 through waveguides of equal length;

[0028] Two output ports of the first polarization beam splitter PBS1 are connected via long-delay waveguides respectively;

[0029] Two output ports of the second polarization beam splitter PBS2 are connected via short-delay waveguides respectively;

[0030] The time difference between the propagation of the optical pulse in the long delay waveguide and the short delay waveguide is equal to n / f, where n is a positive integer;

[0031] The first beam splitter BS1, the first polarization beam splitter PBS1, the second polarization beam splitter PBS2 and the waveguide constitute a first interferometer;

[0032] The second beam splitter BS2, the first polarization beam splitter PBS1, the second polarization beam splitter PBS2 and the waveguide constitute a second interferometer.

[0033] Preferably, the optical quantum entropy source chip includes a first laser LD1, a second laser LD2, a first photodetector PD1, a second photodetector PD2, and a PLC waveguide.

[0034] The PLC waveguide includes a first beam splitter BS1, a second beam splitter BS2, a third polarization beam splitter PBS3, a fourth polarization beam splitter PBS4, and a fifth polarization beam splitter PBS5;

[0035] The first laser LD1 and the first photodetector PD1 are respectively connected to two input ports of the first beam splitter BS1;

[0036] The second laser LD2 and the second photodetector PD2 are respectively connected to two input ports of the second beam splitter BS2;

[0037] Two output ports of the first beam splitter BS1 are respectively connected to an input port of the third polarization beam splitter PBS3 and an input port of the fourth polarization beam splitter PBS4 through waveguides of equal length;

[0038] Two output ports of the second beam splitter BS2 are connected to another input port of the fourth polarization beam splitter PBS4 and one input port of the fifth polarization beam splitter PBS5 through waveguides of equal length;

[0039] Two output ports of the fourth polarization beam splitter PBS4 are connected via long delay waveguides respectively;

[0040] Two output ports of the third polarization beam splitter PBS3 are respectively connected through the first short delay waveguide;

[0041] The two output ports of the fifth polarization beam splitter PBS5 are respectively connected through the second short delay waveguide;

[0042] The time difference between the propagation of the optical pulse in the long delay waveguide and the two short delay waveguides is equal to n / f, where n is a positive integer;

[0043] The first beam splitter BS1, the third polarization beam splitter PBS3, the fourth polarization beam splitter PBS4 and the waveguide constitute a third interferometer;

[0044] The second beam splitter BS2, the fifth polarization beam splitter PBS5, the fourth polarization beam splitter PBS4 and the waveguide constitute a fourth interferometer.

[0045] Preferably, the optical quantum entropy source chip includes a first laser LD1, a second laser LD2, a third laser LD3, a fourth laser LD4, a first photodetector PD1, a second photodetector PD2, a third photodetector PD3, a fourth photodetector PD4, and a PLC waveguide.

[0046] The PLC waveguide includes a first beam splitter BS1, a second beam splitter BS2, a third beam splitter BS3, a fourth beam splitter BS4, a third polarization beam splitter PBS3, a fourth polarization beam splitter PBS4, a fifth polarization beam splitter PBS5, a sixth polarization beam splitter PBS6, and a seventh polarization beam splitter PBS7;

[0047] The first laser LD1 and the first photodetector PD1 are respectively connected to two input ports of the first beam splitter BS1;

[0048] The second laser LD2 and the second photodetector PD2 are respectively connected to two input ports of the second beam splitter BS2;

[0049] The third laser LD3 and the third photodetector PD3 are respectively connected to two input ports of the third beam splitter BS3;

[0050] The fourth laser LD4 and the fourth photodetector PD4 are respectively connected to two input ports of the fourth beam splitter BS4;

[0051] Two output ports of the first beam splitter BS1 are respectively connected to an input port of the third polarization beam splitter PBS3 and an input port of the fourth polarization beam splitter PBS4 through waveguides of equal length;

[0052] Two output ports of the second beam splitter BS2 are connected to another input port of the fourth polarization beam splitter PBS4 and one input port of the fifth polarization beam splitter PBS5 through waveguides of equal length;

[0053] Two output ports of the third beam splitter BS3 are respectively connected to another input port of the fifth polarization beam splitter PBS5 and one input port of the sixth polarization beam splitter PBS6 through waveguides of equal length;

[0054] Two output ports of the fourth beam splitter BS4 are respectively connected to another input port of the sixth polarization beam splitter PBS6 and one input port of the seventh polarization beam splitter PBS7 through waveguides of equal length;

[0055] Two output ports of the fourth polarization beam splitter PBS4 are respectively connected through the first long delay waveguide;

[0056] The two output ports of the sixth polarization beam splitter PBS6 are respectively connected through the second long delay waveguide;

[0057] Two output ports of the third polarization beam splitter PBS3 are respectively connected through the first short delay waveguide;

[0058] The two output ports of the fifth polarization beam splitter PBS5 are respectively connected through the second short delay waveguide;

[0059] Two output ports of the seventh polarization beam splitter PBS7 are respectively connected through a third short delay waveguide;

[0060] The time difference between the propagation of the optical pulse in the long delay waveguide and the short delay waveguide is equal to n / f, where n is a positive integer;

[0061] The first beam splitter BS1, the third polarization beam splitter PBS3, the fourth polarization beam splitter PBS4 and the waveguide constitute a third interferometer;

[0062] The second beam splitter BS2, the fifth polarization beam splitter PBS5, the fourth polarization beam splitter PBS4 and the waveguide constitute a fourth interferometer;

[0063] The third beam splitter BS3, the fifth polarization beam splitter PBS5, the sixth polarization beam splitter PBS6 and the waveguide constitute a fifth interferometer;

[0064] The fourth beam splitter BS4, the sixth polarization beam splitter PBS6, the seventh polarization beam splitter PBS7 and the waveguide constitute a sixth interferometer.

[0065] Preferably, the post-processing method is a Toeplitz matrix algorithm based on fast Fourier transform.

[0066] Preferably, the security chip can run cryptographic algorithms such as ASE and SM2.

[0067] Compared with the prior art, the present invention has the following beneficial effects:

[0068] The present invention proposes a quantum security video surveillance device, which integrates a quantum random number chip and uses a quantum key to encrypt video data to ensure the security of the device. By sharing the interferometer long delay waveguide in the optical quantum entropy source chip, the space occupied by the delay waveguide is reduced. Compared with the traditional MZ interferometer solution, more interferometers can be integrated under the same chip size, which improves the chip integration and random number generation rate. In addition, the random number post-processing function and the video data encoding function are integrated on a SOC chip, which further improves the integration and security of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Figure 1 This is a principle block diagram of the quantum security video monitoring device of the present invention;

[0070] Figure 2 This is a principle block diagram of a first embodiment of a quantum security video monitoring device of the present invention;

[0071] Figure 3 This is a block diagram of the second embodiment of the quantum security video monitoring device of the present invention;

[0072] Figure 4 This is a principle block diagram of the third embodiment of the quantum security video monitoring device of the present invention. DETAILED DESCRIPTION

[0073] The present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0074] like Figure 1 As shown, a quantum security video monitoring device includes a video acquisition module, an image processing module ISP, an optical quantum entropy source chip, an analog-to-digital conversion module ADC, a processing chip SOC, a key pool and a security chip.

[0075] The video acquisition module is used to convert the received optical signal into an electrical signal, and perform image acquisition to obtain original image data;

[0076] The image processing module ISP is used to process the original image data into real image data through the image signal processing algorithm;

[0077] The photon entropy source chip is used to convert the laser phase quantum noise into a light intensity fluctuation signal through an unequal-arm interferometer, and then convert it into an electrical signal;

[0078] The number of the unequal-arm interferometers is at least 2; all unequal-arm interferometers share one long-delay waveguide; the delay difference between the long and short arms of the unequal-arm interferometers is equal to n / f, where n is a positive integer;

[0079] The analog-to-digital conversion module ADC is used to convert the electrical signal generated by the photon entropy source chip into a digital signal to generate an original random number;

[0080] The processing chip SOC is used to perform video encoding on real image data to obtain video data; it is also used to extract randomness from the original random number through a post-processing algorithm to obtain a quantum true random number;

[0081] The key pool is used to store quantum true random numbers;

[0082] The security chip is used to call the quantum true random number in the key pool and convert it into a quantum key, encrypt the video data, and output the encrypted video data.

[0083] The specific working principle is as follows:

[0084] The video acquisition module generally includes a lens and a CMOS sensor, which can convert the received light signal into an electrical signal, and acquire the original image data by capturing the monitored scene.

[0085] The original image data is processed into real image data by the image processing module ISP using the image signal processing algorithm, and then input into the SOC chip for video encoding to obtain video data.

[0086] The optical quantum entropy source chip uses the random phase noise of laser spontaneous radiation as the entropy source of quantum random numbers, specifically through a hybrid integrated pulse laser chip, a photodetector chip, and a PLC waveguide chip containing an unequal-arm interferometer. A pulsed laser with a repetition frequency of f generates light pulses that enter the unequal-arm interferometer, and the delay difference between the long and short arms of the interferometer is set to n / f (n is a positive integer) so that different light pulses interfere with each other. Since different light pulses come from different spontaneous radiation processes, the phase difference is random, and the interference results are also random. The random light intensity signal is converted into an electrical signal for output through a photodetector.

[0087] Then the analog-to-digital conversion module ADC converts the electrical signal generated by the optical quantum entropy source chip into a digital signal to generate an original random number; the processing chip SOC extracts the randomness of the original random number through a post-processing algorithm to obtain a quantum true random number. The generated quantum true random number enters the key pool for storage, and the security chip calls the quantum true random number in the key pool and converts it into a quantum key to encrypt the video data and output the encrypted video data.

[0088] In order to provide enough quantum random numbers for video encryption, the optical quantum entropy source chip can integrate multiple light sources, interferometers and photodetectors into an array, where the number of unequal-arm interferometers is at least 2, and each of the unequal-arm interferometers shares a long delay waveguide, which can improve the integration of the PLC chip while increasing the quantum entropy source content.

[0089] like Figure 2 As shown, the first embodiment of the photon entropy source chip:

[0090] The optical quantum entropy source chip includes a first laser LD1, a second laser LD2, a first photodetector PD1, a second photodetector PD2, and a PLC waveguide.

[0091] The lasers are all the same and are used to generate optical pulse signals with a repetition frequency of f and random phases;

[0092] The photoelectric detectors are all the same and are used to detect the interference light intensity of the interferometer;

[0093] A laser and a photodetector are connected to two ports of an interferometer through lenses respectively;

[0094] The PLC waveguide includes a first beam splitter BS1, a second beam splitter BS2, a first polarization beam splitter PBS1, and a second polarization beam splitter PBS2;

[0095] The first laser LD1 and the first photodetector PD1 are respectively connected to two input ports of the first beam splitter BS1;

[0096] The second laser LD2 and the second photodetector PD2 are respectively connected to two input ports of the second beam splitter BS2;

[0097] Two output ports of the first beam splitter BS1 are respectively connected to an input port of the first polarization beam splitter PBS1 and an input port of the second polarization beam splitter PBS2 through waveguides of equal length;

[0098] Two output ports of the second beam splitter BS2 are connected to another input port of the first polarization beam splitter PBS1 and another input port of the second polarization beam splitter PBS2 through waveguides of equal length;

[0099] Two output ports of the first polarization beam splitter PBS1 are connected via long-delay waveguides respectively;

[0100] Two output ports of the second polarization beam splitter PBS2 are connected via short-delay waveguides respectively;

[0101] The time difference between the propagation of the optical pulse in the long delay waveguide and the short delay waveguide is equal to n / f, where n is a positive integer;

[0102] The first beam splitter BS1, the first polarization beam splitter PBS1, the second polarization beam splitter PBS2 and the waveguide constitute a first interferometer;

[0103] The second beam splitter BS2, the first polarization beam splitter PBS1, the second polarization beam splitter PBS2 and the waveguide constitute a second interferometer.

[0104] The specific working principle is as follows:

[0105] The first laser LD1 emits a light pulse with a repetition frequency of f, which is coupled to an input port of the first beam splitter BS1 through a lens or a pattern spot conversion module, and is split into a first sub-pulse and a second sub-pulse, both of which are polarized in the TE mode in the waveguide. Among them, the first sub-pulse enters an input port of the first polarization beam splitter PBS1 and is directly transmitted, propagates in a clockwise direction in the long-delay waveguide, and the polarization is still in the TE mode. When it returns to the first polarization beam splitter PBS1 again, it still exits from the port where it was incident, and the polarization changes to the TM mode. The second sub-pulse enters an input port of the second polarization beam splitter PBS2 and is directly transmitted, propagates in a clockwise direction in the short-delay waveguide, and the polarization is still in the TE mode. When it returns to the second polarization beam splitter PBS2 again, it still exits from the port where it was incident, and the polarization changes to the TM mode.

[0106] The delay difference between the long delay waveguide and the short delay waveguide is n / f, so the first sub-pulse of the i-th light pulse and the second sub-pulse of the i+n-th light pulse arrive at the first beam splitter BS1 at the same time, and the two have the same polarization and can interfere. Since the two belong to different pulses and have completely random phases, a completely random interference result can be obtained. One of the interference results is coupled to the first photodetector PD1 through a lens or a pattern spot conversion module for light intensity detection to obtain a random electrical signal.

[0107] The second laser LD2 emits a light pulse with a repetition frequency of f, which is coupled to an input port of the second beam splitter BS2 through a lens or a pattern spot conversion module, and is split into a third sub-pulse and a fourth sub-pulse, both of which are polarized in the TE mode in the waveguide. Among them, the third sub-pulse enters another input port of the first polarization beam splitter PBS1, enters the long-delay waveguide and propagates in a clockwise direction, and the polarization changes to the TM mode. When it returns to the second polarization beam splitter PBS2 again, it still exits from the port where it was incident, and the polarization is in the TM mode. The fourth sub-pulse enters an input port of the second polarization beam splitter PBS2, enters the short-delay waveguide and propagates in a clockwise direction, and the polarization changes to the TM mode. When it returns to the second polarization beam splitter PBS2 again, it still exits from the port where it was incident, and the polarization is in the TM mode.

[0108] The delay difference between the long delay waveguide and the short delay waveguide is n / f, then the third sub-pulse of the j-th light pulse and the fourth sub-pulse of the j+n-th light pulse arrive at the second beam splitter BS2 at the same time, and the two have the same polarization and can interfere. Since the two belong to different pulses and have completely random phases, a completely random interference result can be obtained. One of the interference results is coupled to the second photodetector PD2 through a lens or a pattern spot conversion module for light intensity detection to obtain a random electrical signal.

[0109] It can be seen that the first beam splitter BS1, the first polarization beam splitter PBS1, the second polarization beam splitter PBS2 and the waveguide constitute the first interferometer; the second beam splitter BS2, the first polarization beam splitter PBS1, the second polarization beam splitter PBS2 and the waveguide constitute the second interferometer. The two interferometers share the long delay waveguide and the short delay waveguide respectively. The first sub-pulse and the third sub-pulse have the same propagation direction in the long delay waveguide, but their polarizations are perpendicular to each other, and the ports emitted from the first polarization beam splitter PBS1 are also different, so they have no influence on each other.

[0110] like Figure 3 As shown, the second embodiment of the photon entropy source chip:

[0111] The optical quantum entropy source chip includes a first laser LD1, a second laser LD2, a first photodetector PD1, a second photodetector PD2, and a PLC waveguide.

[0112] The lasers are all the same and are used to generate optical pulse signals with a repetition frequency of f and random phases;

[0113] The photoelectric detectors are all the same and are used to detect the interference light intensity of the interferometer;

[0114] A laser and a photodetector are connected to two ports of an interferometer through lenses respectively;

[0115] The optical quantum entropy source chip includes a first laser LD1, a second laser LD2, a first photodetector PD1, a second photodetector PD2, and a PLC waveguide.

[0116] The PLC waveguide includes a first beam splitter BS1, a second beam splitter BS2, a third polarization beam splitter PBS3, a fourth polarization beam splitter PBS4, and a fifth polarization beam splitter PBS5;

[0117] The first laser LD1 and the first photodetector PD1 are respectively connected to two input ports of the first beam splitter BS1;

[0118] The second laser LD2 and the second photodetector PD2 are respectively connected to two input ports of the second beam splitter BS2;

[0119] Two output ports of the first beam splitter BS1 are respectively connected to an input port of the third polarization beam splitter PBS3 and an input port of the fourth polarization beam splitter PBS4 through waveguides of equal length;

[0120] Two output ports of the second beam splitter BS2 are connected to another input port of the fourth polarization beam splitter PBS4 and one input port of the fifth polarization beam splitter PBS5 through waveguides of equal length;

[0121] Two output ports of the fourth polarization beam splitter PBS4 are connected via long delay waveguides respectively;

[0122] Two output ports of the third polarization beam splitter PBS3 are respectively connected through the first short delay waveguide;

[0123] The two output ports of the fifth polarization beam splitter PBS5 are respectively connected through the second short delay waveguide;

[0124] The time difference between the propagation of the optical pulse in the long delay waveguide and the two short delay waveguides is equal to n / f, where n is a positive integer;

[0125] The first beam splitter BS1, the third polarization beam splitter PBS3, the fourth polarization beam splitter PBS4 and the waveguide constitute a third interferometer;

[0126] The second beam splitter BS2, the fifth polarization beam splitter PBS5, the fourth polarization beam splitter PBS4 and the waveguide constitute a fourth interferometer.

[0127] The specific working principle is as follows:

[0128] The first laser LD1 emits a light pulse with a repetition frequency of f, which is coupled to an input port of the first beam splitter BS1 through a lens or a pattern spot conversion module, and is split into a first sub-pulse and a second sub-pulse, both of which are polarized in the TE mode in the waveguide. Among them, the first sub-pulse enters an input port of the fourth polarization beam splitter PBS4 and is directly transmitted, propagates in a clockwise direction in the long-delay waveguide, and the polarization is still in the TE mode. When it returns to the fourth polarization beam splitter PBS4 again, it still exits from the port where it was incident, and the polarization changes to the TM mode. The second sub-pulse enters an input port of the third polarization beam splitter PBS3 and is directly transmitted, propagates in a clockwise direction in the first short-delay waveguide, and the polarization is still in the TE mode. When it returns to the third polarization beam splitter PBS3 again, it still exits from the port where it was incident, and the polarization changes to the TM mode.

[0129] The delay difference between the long delay waveguide and the first short delay waveguide is n / f, so the first sub-pulse of the i-th light pulse and the second sub-pulse of the i+n-th light pulse arrive at the first beam splitter BS1 at the same time, and the two have the same polarization and can interfere. Since the two belong to different pulses and have completely random phases, a completely random interference result can be obtained. One of the interference results is coupled to the first photodetector PD1 through a lens or a pattern spot conversion module for light intensity detection to obtain a random electrical signal.

[0130] The second laser LD2 emits a light pulse with a repetition frequency of f, which is coupled to an input port of the second beam splitter BS2 through a lens or a pattern spot conversion module, and is split into a third sub-pulse and a fourth sub-pulse, both of which are polarized in the TE mode in the waveguide. Among them, the third sub-pulse enters another input port of the fourth polarization beam splitter PBS4, enters the long-delay waveguide and propagates in a clockwise direction, and the polarization changes to the TM mode. When it returns to the fourth polarization beam splitter PBS4 again, it still exits from the port where it was incident, and the polarization is in the TM mode. The fourth sub-pulse enters an input port of the fifth polarization beam splitter PBS5, enters the short-delay waveguide and propagates in a clockwise direction, and the polarization changes to the TM mode. When it returns to the fifth polarization beam splitter PBS5 again, it still exits from the port where it was incident, and the polarization is in the TM mode.

[0131] The delay difference between the long delay waveguide and the second short delay waveguide is n / f, so the third sub-pulse of the jth light pulse and the fourth sub-pulse of the j+nth light pulse arrive at BS2 at the same time, and the two have the same polarization and can interfere. Since the two belong to different pulses and have completely random phases, a completely random interference result can be obtained. One of the interference results is coupled to the second photodetector PD2 through a lens or a pattern spot conversion module for light intensity detection to obtain a random electrical signal.

[0132] It can be seen that the first beam splitter BS1, the third polarization beam splitter PBS3, the fourth polarization beam splitter PBS4 and the waveguide constitute the third interferometer; the second beam splitter BS2, the fourth polarization beam splitter PBS4, the fifth polarization beam splitter PBS5 and the waveguide constitute the fourth interferometer. The two interferometers share the long delay waveguide, and the first sub-pulse and the third sub-pulse have the same propagation direction in the long delay waveguide, but the polarizations of the two are perpendicular to each other, and the ports emitted from the first polarization beam splitter PBS1 are also different, so there is no influence between them.

[0133] like Figure 4 As shown, the third embodiment of the photon entropy source chip:

[0134] The optical quantum entropy source chip includes a first laser LD1, a second laser LD2, a third laser LD3, a fourth laser LD4, a first photodetector PD1, a second photodetector PD2, a third photodetector PD3, a fourth photodetector PD4, and a PLC waveguide.

[0135] The lasers are all the same and are used to generate optical pulse signals with a repetition frequency of f and random phases;

[0136] The photoelectric detectors are all the same and are used to detect the interference light intensity of the interferometer;

[0137] A laser and a photodetector are connected to two ports of an interferometer through lenses respectively;

[0138] The PLC waveguide includes a first beam splitter BS1, a second beam splitter BS2, a third beam splitter BS3, a fourth beam splitter BS4, a third polarization beam splitter PBS3, a fourth polarization beam splitter PBS4, a fifth polarization beam splitter PBS5, a sixth polarization beam splitter PBS6, and a seventh polarization beam splitter PBS7;

[0139] The first laser LD1 and the first photodetector PD1 are respectively connected to two input ports of the first beam splitter BS1;

[0140] The second laser LD2 and the second photodetector PD2 are respectively connected to two input ports of the second beam splitter BS2;

[0141] The third laser LD3 and the third photodetector PD3 are respectively connected to two input ports of the third beam splitter BS3;

[0142] The fourth laser LD4 and the fourth photodetector PD4 are respectively connected to two input ports of the fourth beam splitter BS4;

[0143] Two output ports of the first beam splitter BS1 are respectively connected to an input port of the third polarization beam splitter PBS3 and an input port of the fourth polarization beam splitter PBS4 through waveguides of equal length;

[0144] Two output ports of the second beam splitter BS2 are connected to another input port of the fourth polarization beam splitter PBS4 and one input port of the fifth polarization beam splitter PBS5 through waveguides of equal length;

[0145] Two output ports of the third beam splitter BS3 are respectively connected to another input port of the fifth polarization beam splitter PBS5 and one input port of the sixth polarization beam splitter PBS6 through waveguides of equal length;

[0146] Two output ports of the fourth beam splitter BS4 are respectively connected to another input port of the sixth polarization beam splitter PBS6 and one input port of the seventh polarization beam splitter PBS7 through waveguides of equal length;

[0147] Two output ports of the fourth polarization beam splitter PBS4 are respectively connected through the first long delay waveguide;

[0148] The two output ports of the sixth polarization beam splitter PBS6 are respectively connected through the second long delay waveguide;

[0149] Two output ports of the third polarization beam splitter PBS3 are respectively connected through the first short delay waveguide;

[0150] The two output ports of the fifth polarization beam splitter PBS5 are respectively connected through the second short delay waveguide;

[0151] Two output ports of the seventh polarization beam splitter PBS7 are respectively connected through a third short delay waveguide;

[0152] The time difference between the propagation of the optical pulse in the long delay waveguide and the short delay waveguide is equal to n / f, where n is a positive integer;

[0153] The first beam splitter BS1, the third polarization beam splitter PBS3, the fourth polarization beam splitter PBS4 and the waveguide constitute a third unequal-arm interferometer;

[0154] The second beam splitter BS2, the fifth polarization beam splitter PBS5, the fourth polarization beam splitter PBS4 and the waveguide constitute a fourth unequal-arm interferometer;

[0155] The third beam splitter BS3, the fifth polarization beam splitter PBS5, the sixth polarization beam splitter PBS6 and the waveguide constitute a fifth unequal-arm interferometer;

[0156] The fourth beam splitter BS4, the sixth polarization beam splitter PBS6, the seventh polarization beam splitter PBS7 and the waveguide constitute a sixth unequal-arm interferometer.

[0157] The specific working principle is as follows:

[0158] The first laser LD1 emits a light pulse with a repetition frequency of f, which is coupled to an input port of the first beam splitter BS1 through a lens or a pattern spot conversion module, and is split into a first sub-pulse and a second sub-pulse, both of which are polarized in the TE mode in the waveguide. Among them, the first sub-pulse enters an input port of the fourth polarization beam splitter PBS4 and is directly transmitted, propagates in a clockwise direction in the long-delay waveguide, and the polarization is still in the TE mode. When it returns to the fourth polarization beam splitter PBS4 again, it still exits from the port where it was incident, and the polarization changes to the TM mode. The second sub-pulse enters an input port of the third polarization beam splitter PBS3 and is directly transmitted, propagates in a clockwise direction in the first short-delay waveguide, and the polarization is still in the TE mode. When it returns to the third polarization beam splitter PBS3 again, it still exits from the port where it was incident, and the polarization changes to the TM mode.

[0159] The delay difference between the long delay waveguide and the first short delay waveguide is n / f, so the first sub-pulse of the i-th light pulse and the second sub-pulse of the i+n-th light pulse arrive at the first beam splitter BS1 at the same time, and the two have the same polarization and can interfere. Since the two belong to different pulses and have completely random phases, a completely random interference result can be obtained. One of the interference results is coupled to the first photodetector PD1 through a lens or a pattern spot conversion module for light intensity detection to obtain a random electrical signal.

[0160] The second laser LD2 emits a light pulse with a repetition frequency of f, which is coupled to an input port of the second beam splitter BS2 through a lens or a pattern spot conversion module, and is split into a third sub-pulse and a fourth sub-pulse, both of which are polarized in the TE mode in the waveguide. Among them, the third sub-pulse enters another input port of the fourth polarization beam splitter PBS4, enters the long-delay waveguide and propagates in a clockwise direction, and the polarization changes to the TM mode. When it returns to the fourth polarization beam splitter PBS4 again, it still exits from the port where it was incident, and the polarization is in the TM mode. The fourth sub-pulse enters an input port of the fifth polarization beam splitter PBS5, enters the short-delay waveguide and propagates in a clockwise direction, and the polarization changes to the TM mode. When it returns to the fifth polarization beam splitter PBS5 again, it still exits from the port where it was incident, and the polarization is in the TM mode.

[0161] The delay difference between the long delay waveguide and the second short delay waveguide is n / f, then the third sub-pulse of the j-th light pulse and the fourth sub-pulse of the j+n-th light pulse arrive at the second beam splitter BS2 at the same time, and the two have the same polarization and can interfere. Since the two belong to different pulses and have completely random phases, a completely random interference result can be obtained. One of the interference results is coupled to the second photodetector PD2 through a lens or a pattern spot conversion module for light intensity detection to obtain a random electrical signal.

[0162] The first beam splitter BS1, the third polarization beam splitter PBS3, the fourth polarization beam splitter PBS4 and the waveguide constitute the third interferometer; the second beam splitter BS2, the fourth polarization beam splitter PBS4, the fifth polarization beam splitter PBS5 and the waveguide constitute the fourth interferometer. The two interferometers share the long delay waveguide, and the first sub-pulse and the third sub-pulse have the same propagation direction in the long delay waveguide, but their polarizations are perpendicular to each other, and the ports emitted from the first polarization beam splitter PBS1 are also different, so they have no influence on each other.

[0163] The third beam splitter BS3, the fifth polarization beam splitter PBS5, the sixth polarization beam splitter PBS6 and the waveguide constitute the fifth unequal-arm interferometer; the fourth beam splitter BS4, the sixth polarization beam splitter PBS6, the seventh polarization beam splitter PBS7 and the waveguide constitute the sixth unequal-arm interferometer; the transmission process of the light pulses generated by the third laser LD3 and the fourth laser LD4 in the interferometer is similar to the above process and will not be repeated.

[0164] It can be seen that this embodiment integrates 4 interferometers and only requires 2 long delay waveguides. Figure 1 The number of long-delay waveguides required by existing technologies is the same, so more photon entropy sources can be integrated on a chip of the same size, and the quantum random number generation rate is higher.

[0165] It can be seen from the various embodiments of the present invention that the present invention proposes a quantum security video surveillance device, which integrates a quantum random number chip and uses a quantum key to encrypt video data to ensure the security of the device. By sharing the interferometer long delay waveguide in the optical quantum entropy source chip, the space occupied by the delay waveguide is reduced. Compared with the traditional MZ interferometer solution, more interferometers can be integrated under the same chip size, which improves the chip integration and random number generation rate. In addition, the random number post-processing function and video data encoding functions are integrated on a SOC chip to further improve the integration and security of the device.

Claims

1. A quantum security video surveillance device, characterized in that: include: The video acquisition module is used to convert the received optical signal into an electrical signal and perform image acquisition to obtain the original image data; The image processing module ISP is used to process the original image data into real image data through the image signal processing algorithm; Photon entropy source chip, used to convert laser phase quantum noise into light intensity fluctuation signal through unequal-arm interferometer, and then convert it into electrical signal; The number of the unequal-arm interferometers is at least 2; all unequal-arm interferometers share a long-delay waveguide; the delay difference between the long and short arms of the unequal-arm interferometers is equal to n / f, where n is a positive integer and f is a frequency; The analog-to-digital conversion module ADC is used to convert the electrical signal generated by the photon entropy source chip into a digital signal to generate an original random number; The processing chip SOC is used to perform video encoding on the real image data to obtain video data; It is also used to extract randomness from the original random numbers through post-processing algorithms to obtain quantum true random numbers; Key pool, used to store quantum true random numbers; The security chip is used to call the quantum true random number in the key pool and convert it into a quantum key, encrypt the video data, and output the encrypted video data.

2. The quantum security video surveillance device according to claim 1, characterized in that: The optical quantum entropy source chip includes at least two identical lasers, at least two photodetectors and a PLC waveguide for hybrid integration; The laser is used to generate an optical pulse signal with a repetition frequency of f and a random phase; The PLC waveguide comprises at least two unequal-arm interferometers each having two ports; each of the unequal-arm interferometers shares at least one long-delay waveguide; The photoelectric detectors are all the same and are used to detect the interference light intensity of the unequal-arm interferometer; The number of lasers, photodetectors, and unequal-arm interferometers in the PLC waveguide are equal; A laser and a photodetector are connected to two ports of an unequal-arm interferometer through a lens or a pattern conversion module respectively.

3. The quantum security video surveillance device according to claim 2, characterized in that: The optical quantum entropy source chip includes a first laser LD1, a second laser LD2, a first photodetector PD1, a second photodetector PD2, and a PLC waveguide. The PLC waveguide includes a first beam splitter BS1, a second beam splitter BS2, a polarization beam splitter first polarization beam splitter PBS1, and a second polarization beam splitter PBS2; The first laser LD1 and the first photodetector PD1 are respectively connected to two input ports of the first beam splitter BS1; The second laser LD2 and the second photodetector PD2 are respectively connected to two input ports of the second beam splitter BS2; Two output ports of the first beam splitter BS1 are respectively connected to an input port of the first polarization beam splitter PBS1 and an input port of the second polarization beam splitter PBS2 through waveguides of equal length; Two output ports of the second beam splitter BS2 are connected to another input port of the first polarization beam splitter PBS1 and another input port of the second polarization beam splitter PBS2 through waveguides of equal length; Two output ports of the first polarization beam splitter PBS1 are connected via long-delay waveguides respectively; Two output ports of the second polarization beam splitter PBS2 are connected via short-delay waveguides respectively; The time difference between the propagation of the optical pulse in the long delay waveguide and the short delay waveguide is equal to n / f, where n is a positive integer; The first beam splitter BS1, the first polarization beam splitter PBS1, the second polarization beam splitter PBS2 and the waveguide constitute a first interferometer; The second beam splitter BS2, the first polarization beam splitter PBS1, the second polarization beam splitter PBS2 and the waveguide constitute a second interferometer.

4. The quantum secure video surveillance device according to claim 2, characterized in that: The optical quantum entropy source chip includes a first laser LD1, a second laser LD2, a first photodetector PD1, a second photodetector PD2, and a PLC waveguide. The PLC waveguide includes a first beam splitter BS1, a second beam splitter BS2, a third polarization beam splitter PBS3, a fourth polarization beam splitter PBS4, and a fifth polarization beam splitter PBS5; The first laser LD1 and the first photodetector PD1 are respectively connected to two input ports of the first beam splitter BS1; The second laser LD2 and the second photodetector PD2 are respectively connected to two input ports of the second beam splitter BS2; Two output ports of the first beam splitter BS1 are respectively connected to an input port of the third polarization beam splitter PBS3 and an input port of the fourth polarization beam splitter PBS4 through waveguides of equal length; Two output ports of the second beam splitter BS2 are connected to another input port of the fourth polarization beam splitter PBS4 and one input port of the fifth polarization beam splitter PBS5 through waveguides of equal length; Two output ports of the fourth polarization beam splitter PBS4 are connected via long delay waveguides respectively; Two output ports of the third polarization beam splitter PBS3 are respectively connected through the first short delay waveguide; The two output ports of the fifth polarization beam splitter PBS5 are respectively connected through the second short delay waveguide; The time difference between the propagation of the optical pulse in the long delay waveguide and the two short delay waveguides is equal to n / f, where n is a positive integer; The first beam splitter BS1, the third polarization beam splitter PBS3, the fourth polarization beam splitter PBS4 and the waveguide constitute a third interferometer; The second beam splitter BS2, the fifth polarization beam splitter PBS5, the fourth polarization beam splitter PBS4 and the waveguide constitute a fourth interferometer.

5. The quantum security video surveillance device according to claim 2, characterized in that: The optical quantum entropy source chip includes a first laser LD1, a second laser LD2, a third laser LD3, a fourth laser LD4, a first photodetector PD1, a second photodetector PD2, a third photodetector PD3, a fourth photodetector PD4, and a PLC waveguide. The PLC waveguide includes a first beam splitter BS1, a second beam splitter BS2, a third beam splitter BS3, a fourth beam splitter BS4, a third polarization beam splitter PBS3, a fourth polarization beam splitter PBS4, a fifth polarization beam splitter PBS5, a sixth polarization beam splitter PBS6, and a seventh polarization beam splitter PBS7; The first laser LD1 and the first photodetector PD1 are respectively connected to two input ports of the first beam splitter BS1; The second laser LD2 and the second photodetector PD2 are respectively connected to two input ports of the second beam splitter BS2; The third laser LD3 and the third photodetector PD3 are respectively connected to two input ports of the third beam splitter BS3; The fourth laser LD4 and the fourth photodetector PD4 are respectively connected to two input ports of the fourth beam splitter BS4; Two output ports of the first beam splitter BS1 are respectively connected to an input port of the third polarization beam splitter PBS3 and an input port of the fourth polarization beam splitter PBS4 through waveguides of equal length; Two output ports of the second beam splitter BS2 are connected to another input port of the fourth polarization beam splitter PBS4 and one input port of the fifth polarization beam splitter PBS5 through waveguides of equal length; Two output ports of the third beam splitter BS3 are respectively connected to another input port of the fifth polarization beam splitter PBS5 and one input port of the sixth polarization beam splitter PBS6 through waveguides of equal length; Two output ports of the fourth beam splitter BS4 are respectively connected to another input port of the sixth polarization beam splitter PBS6 and one input port of the seventh polarization beam splitter PBS7 through waveguides of equal length; Two output ports of the fourth polarization beam splitter PBS4 are respectively connected through the first long delay waveguide; The two output ports of the sixth polarization beam splitter PBS6 are respectively connected through the second long delay waveguide; Two output ports of the third polarization beam splitter PBS3 are respectively connected through the first short delay waveguide; The two output ports of the fifth polarization beam splitter PBS5 are respectively connected through the second short delay waveguide; Two output ports of the seventh polarization beam splitter PBS7 are respectively connected through a third short delay waveguide; The time difference between the propagation of the optical pulse in the long delay waveguide and the short delay waveguide is equal to n / f, where n is a positive integer; The first beam splitter BS1, the third polarization beam splitter PBS3, the fourth polarization beam splitter PBS4 and the waveguide constitute a third interferometer; The second beam splitter BS2, the fifth polarization beam splitter PBS5, the fourth polarization beam splitter PBS4 and the waveguide constitute a fourth interferometer; The third beam splitter BS3, the fifth polarization beam splitter PBS5, the sixth polarization beam splitter PBS6 and the waveguide constitute a fifth interferometer; The fourth beam splitter BS4, the sixth polarization beam splitter PBS6, the seventh polarization beam splitter PBS7 and the waveguide constitute a sixth interferometer.

6. The quantum secure video surveillance device according to claim 1, characterized in that: The post-processing algorithm is a Toeplitz matrix algorithm based on fast Fourier transform.

7. The quantum secure video surveillance device according to any one of claims 1 to 6, characterized in that: The security chip can run ASE and SM2 cryptographic algorithms.

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