Multi-path quantum noise stream encryption system and method

Abstract

The invention discloses a multi-channel quantum noise stream encryption system and method, and relates to the technical field of quantum secret communication. The system comprises a transmitting end signal generation modulation module, a 1 * P beam splitter and P (P is greater than or equal to 2) receiving end signal detection modules. After a target binary sequence obtained after spectrum spreading and quantum noise stream encryption are carried out on a plurality of initial binary sequences is obtained, a sending end signal generation modulation module can carry out IQ modulation on the target binary sequence, a composite optical signal is generated, and the composite optical signal is transmitted to a 1 * P beam splitter; after receiving the composite optical signal, the 1 * P beam splitter can distribute the composite optical signal to P receiving end signal detection modules; each receiving end signal detection module can perform coherent detection on the received composite optical signal to obtain a beat frequency signal; and the beat frequency signal is decrypted to obtain information in the initial binary sequence.

Description

Technical Field

[0001] The present application relates to the field of quantum secure communication technology, and in particular to a multi-path quantum noise stream encryption system and method. Background Art

[0002] Quantum noise stream encryption is a secure optical network transmission technology that combines traditional encryption with physical-layer security techniques. Its core process involves first encrypting the signal using a key stream and then scrambling it using quantum noise from optoelectronic devices. Because quantum states are imprecisely measurable and noise is randomly distributed, when the signal is drowned out by noise, eavesdroppers struggle to extract valid information. This communication technology, built on these properties, possesses unique physical-layer defenses, effectively resisting quantum computing attacks. It also supports long-distance transmission and is compatible with existing fiber-optic communication systems. This technology holds great promise for high-capacity, high-speed communications, particularly in secure photonic terahertz communications.

[0003] Current research on quantum noise stream encryption is limited to point-to-point secure communication scenarios, and systematic research on point-to-multipoint network deployment has yet to be conducted. Building a point-to-multipoint quantum noise stream encryption system to achieve efficient encrypted information transmission has become a key technical challenge in the field of quantum secure communication. Summary of the Invention

[0004] Based on the above problems, this application provides a multi-channel quantum noise stream encryption system and method to fill the gap in the current field of quantum secure communication technology where there is no point-to-multipoint quantum noise stream encryption system. Based on the quantum noise stream encryption method, efficient encrypted transmission of information from a single point to multiple points can be achieved.

[0005] The embodiments of this application disclose the following technical solutions:

[0006] In a first aspect, the present application discloses a multi-channel quantum noise stream encryption system, the system comprising: a transmitting end signal generation and modulation module, a 1×P beam splitter, and P receiving end signal detection modules; P ≥ 2;

[0007] The transmitting end signal generation and modulation module is connected to the input port of the 1×P beam splitter, the receiving end signal detection module is connected to the output port of the 1×P beam splitter, and the P receiving end signal detection modules correspond one to one to the P output ports of the 1×P beam splitter;

[0008] The transmitting end signal generation and modulation module is used to perform IQ modulation on the target binary sequence to generate a composite optical signal, and send the composite optical signal to the 1×P beam splitter; the target binary sequence is a binary sequence obtained by performing spread spectrum and quantum noise stream encryption on multiple initial binary sequences;

[0009] The 1×P beam splitter is used to distribute the composite optical signal to P receiving-end signal detection modules;

[0010] The receiving end signal detection module is used to perform coherent detection on the composite optical signal to obtain a beat frequency signal; the beat frequency signal is decrypted to obtain information in the initial binary sequence.

[0011] In an optional implementation, the transmitting end signal generation and modulation module includes a first laser transmitter, a first optical isolator, an IQ modulator, an arbitrary waveform generator, and a first variable optical attenuator;

[0012] The output end of the first laser transmitter is connected to the first end of the first optical isolator, the second end of the first optical isolator is connected to the first end of the IQ modulator, the second end of the IQ modulator is connected to the arbitrary waveform generator, the third end of the IQ modulator is connected to the first end of the first variable optical attenuator, and the second end of the first variable optical attenuator is connected to the input port of the 1×P beam splitter.

[0013] In an optional implementation, each of the receiving-end signal detection modules includes a second laser transmitter, a second optical isolator, a coherent detector, and a second variable optical attenuator;

[0014] The output end of the second laser emitter is connected to the first end of the second optical isolator, the second end of the second optical isolator is connected to the first end of the coherent detector, the second end of the coherent detector is connected to the first end of the second variable optical attenuator, and the second end of the second variable optical attenuator is connected to the output port of the beam splitter.

[0015] A second aspect of the present application discloses a multi-channel quantum noise stream encryption method, which is applied to the multi-channel quantum noise stream encryption system of the first aspect. The method includes:

[0016] Obtaining a target binary sequence; the target binary sequence is a binary sequence obtained by performing spread spectrum and quantum noise stream encryption on multiple initial binary sequences;

[0017] The target binary sequence is processed by the multi-channel quantum noise stream encryption system to obtain P beat frequency signals; the P beat frequency signals respectively correspond to P information receiving points;

[0018] The beat frequency signal is decrypted to obtain the initial binary sequence.

[0019] In an optional implementation, the processing of the target binary sequence by the multi-channel quantum noise stream encryption system to obtain P beat frequency signals includes:

[0020] Processing the target binary sequence through an arbitrary waveform generator to generate multiple orthogonal amplitude modulated coherent state signals, and using the multiple orthogonal amplitude modulated coherent state signals as composite electrical signals;

[0021] The composite electrical signal is modulated onto the phase and amplitude of a first light beam by an IQ modulator to generate a composite optical signal containing multi-channel orthogonal amplitude modulation information; the first light beam is the light beam output by the first laser transmitter;

[0022] Distributing the composite optical signal to P receiving-end signal detector modules through a 1×P beam splitter;

[0023] The composite optical signal and the second light beam are coherently detected by the coherent detector in each of the receiving end signal detector modules to generate the P beat frequency signals; the second light beam is the light beam emitted by the laser transmitter of the receiving end signal detector module.

[0024] In an optional implementation, obtaining the target binary sequence includes:

[0025] After obtaining a plurality of initial binary sequences, each of the initial binary sequences is spread spectrum-spread based on a spreading code to obtain a spread spectrum signal corresponding to each channel of orthogonal amplitude modulated coherent state signal;

[0026] Adding the spread spectrum signals corresponding to the multiple channels of the orthogonal amplitude modulated coherent state signals in the time domain to obtain a first multi-ary sequence;

[0027] Converting the first multi-base sequence into a second binary sequence;

[0028] The quantum noise stream encryption is performed on the second binary sequence to obtain the target binary sequence.

[0029] In an optional implementation, the target binary sequence is composed of y ′ a and y ′ b The method of performing the quantum noise stream encryption on the second binary sequence to obtain the target binary sequence comprises:

[0030] Get the random binary sequence R generated by the random number generator a and R b ; the R a Including R a1 ,R a2 ; the R b Including R b1 ,R b2 ; the R a1 and R a2The length of R b1 and R b2 The length of are all m;

[0031] By y ′ a =(y a ⊕R a1 ,R a2 ), y ′ b =(y b ⊕R b1 ,R b2 ) encrypt the second binary sequence to obtain the target binary sequence; wherein, y a and y b is a sequence of length x in the second binary sequence.

[0032] In an optional implementation, the spreading codes corresponding to each channel of the orthogonal amplitude modulated coherent state signal are different.

[0033] In an optional implementation, decrypting the beat signal to obtain the initial binary sequence includes:

[0034] Perform maximum cross-correlation phase estimation on the beat frequency signal to obtain the target binary sequence; the target binary sequence is composed of y ′ a and y ′ b composition;

[0035] Get the random binary sequence R generated by the random number generator a and R b ; the R a Including R a1 ,R a2 ; the R b Including R b1 ,R b2 ; the R a1 and R a2 The length of R b1 and R b2 The length of are all m;

[0036] Based on the random binary sequence R a and R b decrypting the target binary sequence to obtain a second binary sequence;

[0037] Restoring the second binary sequence into a first multi-ary sequence in the time domain;

[0038] The spread spectrum signal corresponding to the quadrature amplitude modulation coherent state signal in the first multi-ary sequence is processed based on the spread spectrum code corresponding to the quadrature amplitude modulation coherent state signal to obtain an initial binary sequence corresponding to the quadrature amplitude modulation coherent state signal.

[0039] In an optional implementation, the beat frequency signal is represented by (X j +iP j ), where X j is the real part of the beat signal, P j is the imaginary part of the beat signal; the target binary sequence is composed of y ′ a and y ′ b composition;

[0040] The performing maximum cross-correlation phase estimation on the beat frequency signal to obtain the target binary sequence includes:

[0041] When θ0 takes different values, calculate The cross-correlation function value of the real part and imaginary part of the original sequence corresponding to the beat frequency signal;

[0042] The θ0 corresponding to the maximum value of the cross-correlation function is used as the drift phase;

[0043] Substitute the drift signal into X=y ′ a cosθ-y ′ b sinθ,P=y ′ a cosθ+y ′ b From sinθ, we get y ′ a and y ′ b The numerical value of ; the θ is the drift phase.

[0044] In an optional implementation, the method further includes:

[0045] Calculating performance parameters of each channel of the orthogonal amplitude modulation coherent state signal; the performance parameters of the orthogonal amplitude modulation coherent state signal include noise, signal-to-noise ratio, number of masks and detection failure probability;

[0046] Determine whether the performance parameters of the orthogonal amplitude modulation coherent state signals of each channel meet the preset parameter standards.

[0047] Compared with the existing technology, this application has the following beneficial effects:

[0048] The multi-channel quantum noise stream encryption system disclosed in the present application includes a transmitting end signal generation and modulation module, a 1×P beam splitter, and P (P≥2) receiving end signal detection modules. After obtaining a target binary sequence obtained by performing spread spectrum and quantum noise stream encryption on multiple initial binary sequences, the transmitting end signal generation and modulation module can perform IQ modulation on the target binary sequence to generate a composite optical signal, and transmit the composite optical signal to the 1×P beam splitter; after receiving the above composite optical signal, the 1×P beam splitter can distribute the composite optical signal to P receiving end signal detection modules; each receiving end signal detection module can perform coherent detection on the received composite optical signal to obtain a beat frequency signal; after the beat frequency signal is decrypted, the information in the initial binary sequence is obtained. In this way, through the multi-channel quantum noise stream encryption system disclosed in the present application, efficient encrypted transmission of information from a single point to multiple points can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0050] Figure 1 A schematic diagram of the structure of a multi-channel quantum noise stream encryption system provided in an embodiment of the present application;

[0051] Figure 2 This is a flowchart of a multi-channel quantum noise stream encryption method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to help those skilled in the art better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0053] Figure 1 A multi-channel quantum noise stream encryption system is provided in the embodiment of the present application. Figure 1 As shown, the multi-channel quantum noise stream encryption system includes a transmitter signal generation and modulation module, a 1×P beam splitter and P receiver signal detection modules; P ≥ 2.

[0054] Among them, the transmitting end signal generation and modulation module is connected to the input port of the beam splitter, and the receiving end signal detection module is connected to the output port of the beam splitter; the P receiving end signal detection modules correspond one to one to the P output ports of the beam splitter.

[0055] The specific functions of each module in the multi-channel quantum noise stream encryption system are:

[0056] A transmitting-end signal generation and modulation module is configured to perform IQ modulation on a target binary sequence to generate a composite optical signal, and transmit the composite optical signal to the 1×P beam splitter; the target binary sequence is a binary sequence obtained by performing spread spectrum and quantum noise stream encryption on multiple initial binary sequences;

[0057] 1×P beam splitter, used to distribute the composite optical signal to P receiving end signal detection modules;

[0058] The receiving end signal detection module is used to perform coherent detection on the composite optical signal to obtain a beat frequency signal; after the beat frequency signal is decrypted, the information in the initial binary sequence is obtained.

[0059] Combine Figure 1 As shown, the transmitting end signal generation and modulation module includes a first laser transmitter, a first optical isolator, an IQ modulator, an arbitrary waveform generator and a first variable optical attenuator.

[0060] The output end of the first laser transmitter is connected to the first end of the first optical isolator, the second end of the first optical isolator is connected to the first end of the IQ modulator, the second end of the IQ modulator is connected to the arbitrary waveform generator, the third end of the IQ modulator is connected to the first end of the first variable optical attenuator, and the second end of the first variable optical attenuator is connected to the input port of the beam splitter.

[0061] The functions of each component in the transmitter signal generation and modulation module are:

[0062] A first laser emitter, configured to output a first light beam;

[0063] a first optical isolator, configured to block the reflected light in the signal generation and modulation module at the transmitting end from being transmitted back to the first laser, and to send the first light beam to the IQ modulator;

[0064] An arbitrary waveform generator is used to generate a composite electrical signal and send the composite electrical signal to an IQ modulator; the composite electrical signal is composed of P-channel orthogonal amplitude modulated coherent state electrical signals;

[0065] an IQ modulator, configured to optically modulate the composite electrical signal using a first light beam to generate a composite optical signal, and send the composite optical signal to a first variable optical attenuator;

[0066] The first variable optical attenuator is used to adjust the optical power of the composite optical signal to a first target power, and transmit the composite optical signal of the first target power to the beam splitter.

[0067] Combine Figure 1 As shown, the signal detection module includes a second laser transmitter, a second optical isolator, a coherent detector and a second variable optical attenuator.

[0068] The output end of the second laser emitter is connected to the first end of the second optical isolator, the second end of the second optical isolator is connected to the first end of the coherent detector, the second end of the coherent detector is connected to the first end of the second variable optical attenuator, and the second end of the second variable optical attenuator is connected to the output port of the beam splitter.

[0069] The functions of each component in the receiving end signal detection module are:

[0070] a second laser emitter, configured to emit a second light beam;

[0071] A second optical isolator is used to block the reflected light in the signal detection module at the receiving end from being transmitted back to the second laser, and send the second light beam to the coherent detector;

[0072] a second variable optical attenuator, configured to receive the composite optical signal of the second target power output by the beam splitter, adjust the power of the composite optical signal of the second target power to a third target power, and transmit the composite optical signal of the third target power to the coherent detector;

[0073] The coherent detector is used to perform coherent frequency mixing detection based on the composite optical signal of the second light beam and the third target power to obtain a beat frequency signal.

[0074] Figure 2 This is a flowchart of a multi-channel quantum noise stream encryption method provided in an embodiment of the present application.

[0075] Combine Figure 2 As shown, the multi-channel quantum noise stream encryption method in this application includes:

[0076] S201, obtaining a target binary sequence.

[0077] The target binary sequence is a binary sequence obtained by performing spread spectrum and quantum noise stream encryption on multiple initial binary sequences.

[0078] In an optional implementation, the steps of obtaining the target binary sequence are:

[0079] A1. After obtaining multiple initial binary sequences, each of the initial binary sequences is spread based on a spread spectrum code to obtain a spread spectrum signal corresponding to each channel of orthogonal amplitude modulated coherent state signal.

[0080] For example, the kth initial binary sequence consists of a k and b k The kth initial binary sequence corresponds to the spreading code c k ; The expression of the k-th orthogonal amplitude modulated coherent state signal is y ak (t) = c k ×a k (t);y bk (t) = c k ×b k (t); In this way, the spread spectrum signal corresponding to each channel of orthogonal amplitude modulation coherent state signal can be obtained. Among them, a k and b k are all binary sequences with 1 row and M columns; c k It is a binary sequence of n rows and 1 column; t is time; k = 1, 2…, n.

[0081] It should be emphasized that in the present application, the spreading codes of the multiple orthogonal amplitude modulated coherent state signals are different from each other, so as to separate the multi-path signals in the code domain.

[0082] A2: Add the spread spectrum signals corresponding to the multiple initial binary sequences in the time domain to obtain a first multi-ary sequence.

[0083] For example, the expression of the first multi-ary sequence is: a (t) = y a1 (t)+y a2 (t)+…+y an (t);y b (t) = y b1 (t)+y b2 (t)+…+y bn (t). Where n = 2 x -1, x is an integer; y a (t) and y b (t) is a sequence of n rows and m columns.

[0084] A3: Convert the first multi-base sequence into a second binary sequence.

[0085] Specifically, y a (t) Concatenate columns to form a 1-row n×M-column matrix y a ; y b (t) Concatenate columns to form a 1-row n×M-column matrix y b ; y a and y b as the second binary sequence.

[0086] in,

[0087] A4. Perform the quantum noise stream encryption on the second binary sequence to obtain the target binary sequence.

[0088] Get the random binary sequence R generated by the random number generator a and R b ; through y ′ a =(y a-x ⊕R a1 ,R a2 ), y ′ b =(y b-x ⊕R b1 ,R b2 ) Encrypt the second binary sequence to obtain a target binary sequence.

[0089] Among them, R a Including R a1 ,R a2 ; R b Including R b1 ,R b2 ; R a1 and R a2 The length of R is x; b1 and R b2 The length of y is m; a-x and y b-x is a sequence of length x in the second binary sequence; y ′ a ,y ′ b The length of each is m+x.

[0090] For example, y a 011, R a is the random binary sequence 101001 used for encryption, R a1 is 101, R a2 The XOR sequence is 001, 011⊕101=110, and the encrypted sequence is added to get the sequence 110001.

[0091] S202: Process the target binary sequence through the multi-channel quantum noise stream encryption system to obtain P beat frequency signals.

[0092] The specific process is as follows:

[0093] B1, start the multi-channel quantum noise stream encryption system, so that each laser can emit light normally and each electronic device can work normally.

[0094] B2, after the target binary sequence is input into the arbitrary waveform generator of the multi-channel quantum noise stream encryption system, the arbitrary waveform generator processes the target binary sequence (y ′ a 、y ′ b ), generating multiple channels of orthogonal amplitude modulated coherent state signals, and using the multiple channels of orthogonal amplitude modulated coherent state signals as composite electrical signals.

[0095] B3, using an IQ modulator to modulate the composite electrical signal onto the phase and amplitude of the first optical beam, generating a composite optical signal containing multi-channel orthogonal amplitude modulation information (wherein the composite optical signal is a coherent signal and can be represented as two orthogonal components, X and P). The first optical beam is the beam output by the first laser transmitter.

[0096] B4, distributes the composite optical signal to P receiving-end signal detector modules through a 1×P beam splitter.

[0097] B5, through the coherent detector in each receiving-end signal detector module, coherently detects the composite optical signal and the second light beam, generating P beat signals. The P beat signals correspond to the P information receiving points. The second light beam is the light beam emitted by the laser transmitter in the receiving-end signal detector module.

[0098] S203: Decrypt the beat frequency signal to obtain the initial binary sequence.

[0099] C1, performing maximum cross-correlation phase estimation on the beat frequency signal to obtain the target binary sequence.

[0100] It can be understood that X and P are two regular components of the light field. In the initial state, X and P are equal to y ′ a and y ′ b (The target binary sequence is represented by y ′ a and y ′ b During the optical signal transmission process, X and P will have a phase shift θ. ′ a cosθ-y ′ b sinθ,P=y ′ a cosθ+y ′ b sinθ.

[0101] It can be understood that the beat frequency signal can be expressed as (X j +iP j ); where Xj is the real part of the beat frequency signal, P j is the imaginary part of the beat frequency signal.

[0102] The specific process of this step is: first, the coherent state signal (X j +iP j ) are multiplied by get Then, when θ0 takes different values, we calculate The real and imaginary parts of the real part and the real part of the original sequence corresponding to the beat frequency signal a j and the imaginary part b j The cross-correlation function value; the θ0 corresponding to the maximum cross-correlation function value is used as the drift phase θ; the value of the drift signal θ is substituted into X=y ′ a cosθ-y ′ b sinθ,P=y ′ a cosθ+y ′ b From sinθ, we get y ′ a and y ′ b The numerical value of .

[0103] C2, obtain the random binary sequence R generated by the random number generator a and R b .

[0104] Among them, R a Including R a1 ,R a2 ; R b Including R b1 ,R b2 ; R a1 and R a2 The length of R is x; b1 and R b2 The length is m.

[0105] It can be understood that the random binary sequence R in step C2 a and R b , and the random binary sequence R in step A4 a and R b Exactly the same.

[0106] C3, based on the random binary sequence R a and R b The target binary sequence is decrypted to obtain a second binary sequence.

[0107] As mentioned above, the target binary sequence in this application is composed of y ′ a and y ′ b composition.

[0108] From the target binary sequence y ′ a ,y ′ b In the process, a sequence of length m+x is taken out each time; R in the m+x sequence is removed. a2 and R b2 Sequence, get y1,y2 (length is x); then based on the formula y a =y1⊕R a1 ;y b =y2⊕R b1 , calculate y a ,y b (length x), remember to the second binary sequence.

[0109] in,

[0110] C4, restore the second binary sequence to the first multi-ary sequence in the time domain.

[0111] The expression of the first multi-ary sequence is: y a (t) = y a1 (t)+y a2 (t)+…+y an (t);y b (t) = y b1 (t)+y b2 (t)+…+y bn (t). Where n = 2 x -1, x is an integer; y a (t) and y b (t) is a sequence of n rows and m columns.

[0112] It should be emphasized that in this application, the uppercase and lowercase forms of the same letter have different meanings. For example, the uppercase letter M and the lowercase letter m have different meanings; this application distinguishes between uppercase and lowercase letters. The meanings of the letters in this step are described in the previous embodiment and will not be repeated here.

[0113] C5. Process the spread spectrum signal corresponding to the quadrature amplitude modulation coherent state signal in the first multi-ary sequence based on the spread spectrum code corresponding to the quadrature amplitude modulation coherent state signal to obtain an initial binary sequence corresponding to the quadrature amplitude modulation coherent state signal.

[0114] Exemplarily, for the kth quadrature amplitude modulation coherent state signal, the corresponding despread signal is: The a k and b k (corresponding letters refer to the introduction in step A1).

[0115] In this way, the initial binary sequence corresponding to each quadrature amplitude modulation coherent state signal can be obtained.

[0116] In an optional implementation, the performance parameters (such as noise, signal-to-noise ratio, mask number, and detection failure probability) of the quadrature amplitude modulation coherent state signals are also calculated in the present application; based on the calculated performance parameters, it is determined whether the performance parameters of the quadrature amplitude modulation coherent state signals reach the preset parameter standard, so as to evaluate whether the security of the encryption scheme is high enough.

[0117] In summary, the present application discloses a multi-point-to-multipoint quantum noise stream encryption system, and based on the principle of code division multiple access (CDMA), a multi-channel quantum noise stream encryption method is constructed. The method realizes the encryption of multi-channel quantum noise stream by spreading and despreading the quantum noise stream with different pseudo-random codes. In the multi-channel quantum noise stream encryption system, the multi-point quantum noise stream encryption method is used to realize efficient multi-user quantum noise stream encryption and transmission.

[0118] The above is only one specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed in the present application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A multi-channel quantum noise stream encryption system, characterized in that: The system includes: a transmitting end signal generation and modulation module, a 1×P beam splitter and P receiving end signal detection modules; P ≥ 2; The transmitting end signal generation and modulation module is connected to the input port of the 1×P beam splitter, the receiving end signal detection module is connected to the output port of the 1×P beam splitter, and the P receiving end signal detection modules correspond one to one to the P output ports of the 1×P beam splitter; The transmitting end signal generation and modulation module is used to perform IQ modulation on the target binary sequence to generate a composite optical signal, and send the composite optical signal to the 1×P beam splitter; the target binary sequence is a binary sequence obtained by performing spread spectrum and quantum noise stream encryption on multiple initial binary sequences; The 1×P beam splitter is used to distribute the composite optical signal to P receiving-end signal detection modules; The receiving end signal detection module is used to perform coherent detection on the composite optical signal to obtain a beat frequency signal; the beat frequency signal is decrypted to obtain information in the initial binary sequence.

2. The multi-channel quantum noise stream encryption system according to claim 1, characterized in that: The transmitting end signal generation and modulation module includes a first laser transmitter, a first optical isolator, an IQ modulator, an arbitrary waveform generator and a first variable optical attenuator; The output end of the first laser transmitter is connected to the first end of the first optical isolator, the second end of the first optical isolator is connected to the first end of the IQ modulator, the second end of the IQ modulator is connected to the arbitrary waveform generator, the third end of the IQ modulator is connected to the first end of the first variable optical attenuator, and the second end of the first variable optical attenuator is connected to the input port of the 1×P beam splitter.

3. The multi-channel quantum stream encryption system according to claim 2, characterized in that: Each of the receiving end signal detection modules includes a second laser transmitter, a second optical isolator, a coherent detector and a second variable optical attenuator; The output end of the second laser emitter is connected to the first end of the second optical isolator, the second end of the second optical isolator is connected to the first end of the coherent detector, the second end of the coherent detector is connected to the first end of the second variable optical attenuator, and the second end of the second variable optical attenuator is connected to the output port of the beam splitter.

4. A multi-channel quantum noise stream encryption method, characterized in that: The method is applied to the multi-channel quantum noise stream encryption system according to claim 3, and the method comprises: Obtaining a target binary sequence; the target binary sequence is a binary sequence obtained by performing spread spectrum and quantum noise stream encryption on multiple initial binary sequences; The target binary sequence is processed by the multi-channel quantum noise stream encryption system to obtain P beat frequency signals; the P beat frequency signals respectively correspond to P information receiving points; The beat frequency signal is decrypted to obtain the initial binary sequence.

5. The method according to claim 4, characterized in that The processing of the target binary sequence by the multi-channel quantum noise stream encryption system to obtain P beat frequency signals includes: Processing the target binary sequence through an arbitrary waveform generator to generate multiple orthogonal amplitude modulated coherent state signals, and using the multiple orthogonal amplitude modulated coherent state signals as composite electrical signals; The composite electrical signal is modulated onto the phase and amplitude of a first light beam by an IQ modulator to generate a composite optical signal containing multi-channel orthogonal amplitude modulation information; the first light beam is the light beam output by the first laser transmitter; Distributing the composite optical signal to P receiving-end signal detector modules through a 1×P beam splitter; The composite optical signal and the second light beam are coherently detected by the coherent detector in each of the receiving end signal detector modules to generate the P beat frequency signals; the second light beam is the light beam emitted by the laser transmitter of the receiving end signal detector module.

6. The method according to claim 4, characterized in that The obtaining of the target binary sequence includes: After obtaining a plurality of initial binary sequences, each of the initial binary sequences is spread spectrum-spread based on a spreading code to obtain a spread spectrum signal corresponding to each channel of orthogonal amplitude modulated coherent state signal; Adding the spread spectrum signals corresponding to the multiple channels of the orthogonal amplitude modulated coherent state signals in the time domain to obtain a first multi-ary sequence; Converting the first multi-base sequence into a second binary sequence; The quantum noise stream encryption is performed on the second binary sequence to obtain the target binary sequence.

7. The method according to claim 6, characterized in that The target binary sequence is represented by y ′ a and y ′ b The method of performing the quantum noise stream encryption on the second binary sequence to obtain the target binary sequence comprises: Get the random binary sequence R generated by the random number generator a and R b ; the R a Including R a1 ,R a2 ; the R b Including R b1 ,R b2 ; the R a1 and R a2 The length of R b1 and R b2 The length of are all m; pass Encrypt the second binary sequence to obtain the target binary sequence; wherein y a and y b is a sequence of length x in the second binary sequence.

8. The method according to claim 5, characterized in that The spread spectrum codes corresponding to each channel of the orthogonal amplitude modulated coherent state signals are different from each other.

9. The method according to claim 4, characterized in that The decrypting the beat frequency signal to obtain the initial binary sequence includes: Perform maximum cross-correlation phase estimation on the beat frequency signal to obtain the target binary sequence; the target binary sequence is composed of y ′ a and y ′ b composition; Get the random binary sequence R generated by the random number generator a and R b ; the R a Including R a1 ,R a2 ; the R b Including R b1 ,R b2 ; the R a1 and R a2 The length of R b1 and R b2 The length of are all m; Based on the random binary sequence R a and R b decrypting the target binary sequence to obtain a second binary sequence; Restoring the second binary sequence into a first multi-ary sequence in the time domain; The spread spectrum signal corresponding to the quadrature amplitude modulation coherent state signal in the first multi-ary sequence is processed based on the spread spectrum code corresponding to the quadrature amplitude modulation coherent state signal to obtain an initial binary sequence corresponding to the quadrature amplitude modulation coherent state signal.

10. The method according to claim 9, characterized in that The beat frequency signal is expressed as (X j +iP j ), where X j is the real part of the beat signal, P j is the imaginary part of the beat signal; the target binary sequence is composed of y ′ a and y ′ b composition; The performing maximum cross-correlation phase estimation on the beat frequency signal to obtain the target binary sequence includes: When θ0 takes different values, calculate The cross-correlation function value of the real part and imaginary part of the original sequence corresponding to the beat frequency signal; The θ0 corresponding to the maximum value of the cross-correlation function is used as the drift phase; Substitute the drift signal into X=y ′ a cosθ-y ′ b sinθ,P=y ′ a cosθ+y ′ b From sinθ, we get y ′ a and y ′ b The numerical value of ; the θ is the drift phase.

11. The method according to claim 9, characterized in that The method further comprises: Calculating performance parameters of each channel of the orthogonal amplitude modulation coherent state signal; the performance parameters of the orthogonal amplitude modulation coherent state signal include noise, signal-to-noise ratio, number of masks and detection failure probability; Determine whether the performance parameters of the orthogonal amplitude modulation coherent state signals of each channel meet the preset parameter standards.

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