CN115664537A - Control system and control method for quantum communication network - Google Patents
Control system and control method for quantum communication network Download PDFInfo
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Abstract
The application provides a control system for a quantum communication network, comprising: a plurality of node control units comprising a first node control unit and a second node control unit, the plurality of node control units coupled by a plurality of quantum channels; a central control unit, coupled to the node control units, respectively, and configured to receive a request sent by the first node control unit to communicate with the second node control unit, select a first quantum channel of the plurality of quantum channels, and send a channel switching instruction to the first node control unit and the second node control unit. According to the control system provided by the invention, the node control units are arranged at each node of the quantum communication network, and the communication efficiency and the communication safety of quantum direct communication are ensured through the cooperative cooperation of the central control unit and each node control unit; meanwhile, the quantum channel is selected through a preset algorithm, so that the attenuation and loss of quantum optical signals in the transmission process are avoided.
Description
Technical Field
The present application relates to the field of quantum direct communication technologies, and in particular, to a control system for a quantum communication network, a method for controlling the quantum communication network using the control system, and a non-transitory computer-readable storage medium.
Background
The quantum direct communication is a technology for information transmission by taking a quantum state as a carrier, and the safety of the quantum direct communication is ensured by a quantum physical principle and has high safety. The application of quantum direct communication network is one of the signs of the development of the internet from the electronic age to the quantum age. Today, quantum computing is increasingly developed, security of a classical cryptosystem based on a mathematical complexity problem faces a great challenge, and quantum direct communication plays an important role in next generation secure communication by virtue of physical principle security. The quantum direct communication is proposed in 2000, more than 20 years of history exist so far, the development of the quantum direct communication goes through four stages, the first stage is 2000-2004, basic concepts and theories are established, and typical quantum direct communication protocols such as an entanglement-based high-efficiency protocol, an entanglement-based two-step protocol and a single photon-based DL04 protocol are proposed. The second stage is 2005-2015, a great number of theoretical protocols are proposed in the development protocol and application exploration stage, and the possible application of quantum direct communication is widely explored. The third stage is 2016-2019, and the stage of principle experiment verification and prototype development. At this stage, quantum direct communication schemes based on entangled quantum direct communication protocols and single photons were experimentally validated. The fourth stage is 2020 to date, and the development and the practicability of products are promoted. The quantum direct communication network realizes interconnection and intercommunication among network users, has the characteristics of long-distance high-speed communication, has the functions of eavesdropping sensing and prevention, and has a real-time eavesdropping alarm function at a user terminal; based on a safe relay technology, a quantum direct communication network can be continuously expanded according to requirements, so that a large-scale quantum network is built, and the power-assisted internet leaps from the electronic era to the quantum era.
In the prior art, the communication network based on the ethernet cannot be applied to quantum secure direct communication for the following reasons:
first, in a network system of quantum secure direct communication, each node is usually connected to a plurality of other nodes, and when an end user on a certain node has a communication requirement, a central control unit of the quantum secure direct communication network needs to send a communication request signal, and then the central control unit issues an optical fiber path switching signal. In the process of communication between the node controller of the node and the central control unit of the quantum secure direct communication network, a terminal user of the node sends transmission data to the quantum secure direct communication equipment through the node controller, the transmission data are exposed in a circuit communicated with the central control unit, data leakage is easily caused, namely, the transmission data can be eavesdropped or intercepted on a path communicated with the node controller or the central control unit, and the significance of secure communication is lost.
Secondly, in a network for quantum secure direct communication, each node needs to be deployed with a terminal device supporting the operation of a quantum communication protocol, and due to the limitation of quantum state modulation, a transmitter and a receiver cannot be multiplexed, and each transmitter/receiver can only perform simplex communication with one receiver/transmitter at the same time.
Thirdly, in the network system of the quantum secure direct communication, it is necessary to perform overall planning on the node controllers of the user access nodes, select quantum channels that do not form a conflict, and perform the quantum secure direct communication.
Fourthly, because the quantum optical signal is a single photon signal or a decoy weak coherent optical pulse signal, the signal intensity is weak, and a relay node needs to be added in the long-distance transmission process to receive, decode, re-encode the transmission signal onto the quantum optical pulse and forward the transmission signal, so that the attenuation and loss of the quantum optical signal in the transmission process are avoided.
Disclosure of Invention
In view of at least one of the deficiencies of the prior art, the present invention provides a control system for a quantum communication network, comprising:
a plurality of node control units comprising a first node control unit and a second node control unit, the plurality of node control units coupled by a plurality of quantum channels;
a central control unit, coupled to the node control units, respectively, and configured to receive a request sent by the first node control unit to communicate with the second node control unit, select a first quantum channel of the plurality of quantum channels, and send a channel switching instruction to the first node control unit and the second node control unit.
According to an aspect of the invention, wherein the plurality of node control units further comprises a third node control unit, the first quantum channel is coupled with the first node control unit, the second node control unit via the third node control unit, the central control unit is further configured to:
and sending a channel switching instruction to the third node control unit.
According to an aspect of the invention, wherein the central control unit is further configured to:
and selecting the first quantum channel by adopting a preset algorithm according to the topological structure of the quantum communication network and the occupation conditions of the plurality of quantum channels.
According to an aspect of the invention, wherein the node control unit is provided at a user access node or a relay node.
According to an aspect of the present invention, wherein the node control unit is coupled to the QSDC quantum direct communication device and the user terminal located at the same user access node, respectively, the node control unit is configured to:
forwarding the data to be transmitted sent by the user terminal to the quantum direct communication equipment; and/or
And forwarding the transmission data received by the quantum direct communication equipment to the user terminal.
According to an aspect of the invention, the control system further comprises: a channel switching component, disposed at a user access node or a relay node, and coupled to the node control unit located at the same node, where the node control unit is further configured to:
and responding to the channel switching instruction, and controlling the channel switching components located at the same node to switch to the corresponding quantum channels.
According to an aspect of the invention, wherein the node control unit is further configured to:
after the channel switching component is switched to the corresponding quantum channel, a channel switching completion instruction is sent to the central control unit;
the central control unit is further configured to:
and responding to the channel switching completion instruction sent by the first node control unit, the second node control unit and the third node control unit, and sending a channel initialization instruction to the first node control unit, the second node control unit and the third node control unit.
According to an aspect of the invention, wherein the central control unit is further configured to:
responding to a channel initialization completion instruction sent by the first node control unit, the second node control unit and the third node control unit, and sending a communication start instruction to the first node control unit, the second node control unit and the third node control unit;
and responding to an ending request instruction sent by the first node control unit or the second node control unit, and sending an ending communication instruction to a passively ended node control unit.
The present invention also provides a method of controlling a quantum communication network using a control system as described above, comprising:
and receiving, by the central control unit, a request sent by the first node control unit to communicate with the second node control unit, selecting a first quantum channel of the plurality of quantum channels, and sending a channel switching instruction to the first node control unit and the second node control unit.
According to an aspect of the invention, wherein the plurality of node control units further comprises a third node control unit, the first quantum channel is coupled with the first node control unit, the second node control unit via the third node control unit, the method further comprising:
and sending a channel switching instruction to the third node control unit through the central control unit.
The present invention also provides a non-transitory computer readable storage medium having stored thereon computer readable instructions which, when executed by a processor, cause the processor to perform a method as described above.
The invention provides a control system and a control method for a quantum communication network, wherein each node of the quantum communication network is provided with a node control unit, the central control unit is used for overall planning each node control unit, the central control unit responds to a communication request instruction sent by each node control unit, selects a proper quantum channel, sends a channel switching instruction, responds to a channel switching completion instruction, a channel initialization completion instruction and an end request instruction sent by each node control unit, respectively sends a channel initialization instruction, a communication start instruction and an end communication instruction, and ensures the communication efficiency and the communication safety of quantum direct communication equipment through the cooperative cooperation of the central control unit and each node control unit, and simultaneously selects the quantum channel through a preset algorithm to avoid the attenuation and loss of quantum optical signals in the transmission process.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without exceeding the protection scope of the present application.
Fig. 1 shows a network topology of a quantum direct communication network;
FIG. 2 illustrates a control system for a quantum communication network provided by an embodiment of the present invention;
fig. 3 illustrates a control process of a control system for a quantum communication network provided by an embodiment of the present invention;
FIG. 4 illustrates a node control unit in a control system for a quantum communication network provided by an embodiment of the invention;
fig. 5 illustrates a method for controlling a quantum communication network according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the description of the embodiments is only intended to facilitate the understanding of the methods and their core concepts of the present application. Meanwhile, a person skilled in the art should, according to the idea of the present application, change or modify the embodiments and applications of the present application based on the scope of the present application. In view of the above, the description should not be taken as limiting the application.
The present invention provides a control system 100 for a direct quantum communication network, as shown in fig. 1, the direct quantum communication network may have a plurality of different topologies, and the direct quantum communication networks with different topologies are all suitable for the control system 100 provided in the present invention. The quantum direct communication network comprises a plurality of nodes including a plurality of access nodes and at least one relay node, wherein a QSDC quantum direct communication device (QSDC quantum direct communication transceiver) is arranged at the plurality of nodes, and quantum direct communication between the nodes is carried out through the QSDC quantum direct communication device arranged at each node. And for the channel selection, the uploading and downloading of data, the sending and the response of the instruction are finished by the cooperation of the node control unit and the central control unit which are arranged at each node. The control system 100 of the quantum direct communication network provided by the invention improves the operation efficiency of the quantum direct communication network and ensures the communication safety of the quantum direct communication.
According to an embodiment of the present invention, as shown in fig. 2, the present invention provides a control system 100 of a quantum communication network, including a plurality of node control units 110 and a central control unit 120. Wherein: the plurality of node control units 110 are connected to each other through a plurality of quantum channels.
The node control unit 110 is provided in the user access node or the relay node. The node control units 110 of two subscriber access nodes communicating with each other may be connected by a quantum wire (for example, a piece of optical fiber), or may be connected by a plurality of quantum wires via one or more other node control units 110. The quantum wire or wires connecting two subscriber access nodes in communication with each other are called a quantum channel.
Wherein the length of a quantum wire (e.g., a length of optical fiber) connecting two node control units 110 is less than the maximum distance of direct quantum communication. Because the quantum direct communication adopts single photon or decoy weak coherent light as an information carrier, the intensity of a quantum optical signal is extremely weak, and the quantum optical signal is attenuated and lost in the process of quantum channel transmission, the length of a quantum line connecting two node control units 110 needs to be set to be smaller than the maximum distance of the quantum direct communication, and the maximum distance of the quantum direct communication is determined according to the attenuation condition of the quantum optical signal in the quantum channel transmission.
For two user access nodes with a relatively long physical distance, if a quantum line (e.g. a section of optical fiber) is used to directly connect the node control units 110 of the two user access nodes, the quantum optical signal carrying valid information is attenuated to a level that cannot be effectively measured and read during the transmission of the quantum line. Therefore, a relay node needs to be provided between the two user access nodes.
According to one embodiment of the invention, in a quantum direct communication network, a user access node and a relay node are both provided with quantum direct communication equipment (quantum direct communication transceiver), the two user access nodes which are communicated with each other comprise an information sending party and an information receiving party, the relay node receives and forwards a quantum optical signal which is sent by the information sending party and carries effective information, and the quantum optical signal finally reaches the information receiving party after being received and forwarded by one or more relay nodes, so that the loss of the effective information caused by the attenuation and loss of the quantum optical signal is avoided.
According to one embodiment of the invention, in a quantum communication network, a user access node is used as a node for accessing a user terminal into the quantum communication network and is used for sending/receiving quantum optical signals carrying effective information; and the relay node also serves as a relay node and provides relay for the access node of other users to send/receive effective information.
According to an embodiment of the present invention, a QSDC quantum direct communication device (QSDC quantum direct communication transceiver) provided to a user access node or a relay node is configured to:
coding effective information on a quantum state, preparing a quantum light pulse (a single photon pulse or a decoy state weak coherent light pulse) and emitting; and
and receiving the quantum light pulse and measuring the quantum state of the quantum light pulse to obtain the data information carried by the quantum light pulse.
QSDC quantum direct communication equipment and a node control unit 110 which are arranged in the same user access node or a relay node may also be connected through a line (for example, an optical fiber) for transmitting a quantum optical signal, and the QSDC quantum direct communication equipment prepares a quantum optical pulse, and transmits the quantum optical pulse through the node control unit 110 located in the same user access node or the relay node; after receiving the quantum optical pulse, the node control unit 110 also outputs the quantum optical pulse to the QSDC quantum direct communication device located in the same user access node or relay node to measure and read the quantum state.
The plurality of node control units 110 are connected to each other through a plurality of quantum channels, that is, QSDC quantum direct communication devices located at a plurality of user access nodes or relay nodes are connected to each other through a plurality of quantum channels. And the node control unit 110 located at the same user access node or relay node controls the selection of the quantum channel by the QSDC quantum direct communication device and the data exchange (upload and download) between the QSDC quantum direct communication device and the user terminal.
The central control unit 120 is coupled to a plurality of node control units 110, respectively, wherein the plurality of node control units includes a first node control unit 110-1 and a second node control unit 110-2. The central control unit 120 is configured to:
the method comprises the steps of receiving a request sent by a first node control unit 110-1 to communicate with a second node control unit 110-2, selecting a first quantum channel in a plurality of quantum channels, and sending a channel switching instruction to the first node control unit 110-1 and the second node control unit 110-2.
According to an embodiment of the present invention, the plurality of node control units further includes a third node control unit 110-3, the first quantum channel is connected with the first node control unit 110-1 and the second node control unit 110-2 via the third node control unit 110-3, the central control unit 120 is further configured to:
a channel switching instruction is sent to the third node control unit 110-3.
The central control unit 120 cooperates with the node control unit 110 disposed at each user access node or relay node, and a specific process of controlling the QSDC quantum direct communication device disposed at each user access node or relay node is as follows (as shown in fig. 3):
when a user terminal located at a certain user access node has a communication requirement, the user terminal sends a communication request to a node control unit (not set as the node control unit 110-1) of the user access node, and the node control unit 110-1 analyzes the communication request sent by the user terminal to obtain the routing information and the type of the access terminal equipment of the user terminal.
The node control unit 110-1 transmits a communication request instruction including the routing information of the user terminal and the access terminal device type to the central control unit 120. The node control unit 110-1 simultaneously transmits the access terminal device type of the subscriber terminal to the QSDC quantum direct communication device located at the same subscriber access node.
The central control unit 120 obtains a first quantum channel by using a preset algorithm according to the topology structure of the quantum direct communication network and the currently occupied quantum channel, where the first quantum channel connects the user access node where the user terminal having the communication request is located and the user access node where the user of the requested party is located. Optionally, the first quantum channel is via a relay node. The central control unit 120 sends a channel switching instruction to the node control unit 110-1 that sends the communication request instruction, the node control unit (not set as the node control unit 110-2) of the user access node where the user of the requested party is located, and the other node control units (not set as the node control unit 110-3) through which the first quantum channel passes, where the relay node sets the node control unit 110-3, and the channel switching instruction includes a route allocation packet.
After receiving the channel switching instruction, the node control units 110-1, 110-2 and 110-3 analyze the route distribution data packet to obtain a route lookup table, and determine the quantum channel to be switched according to the route lookup table.
According to an embodiment of the present invention, the control system 100 of the quantum communication network further comprises:
a plurality of channel switching components, which are disposed at a user access node or a relay node, and are communicatively connected to a node control unit 110 disposed at the same user access node or the relay node, where the node control unit 110 is configured to:
and controlling the channel switching component to perform channel switching according to the channel switching instruction sent by the central control unit 120.
After the channel switching is completed, the node control units 110-1, 110-2 and 110-3 send a switching completion instruction to the central control unit 120, and the central control unit 120 updates channel resources and sends a channel initialization instruction in response to the channel switching completion instruction sent by the node control units 110-1, 110-2 and 110-3.
After receiving the channel initialization command, the node control units 110-1, 110-2 and 110-3 control the QSDC quantum direct communication devices located in the same user access node or relay node to perform channel initialization, including channel security detection. Optionally, the plurality of node control units 110 are also connected through a classical channel, and QSDC quantum direct communication devices located at the same user access node or relay node are also connected with the node control unit 110 through a line that can transmit classical information (including electrical signals or optical signals). The channel security detection comprises:
at the same time or after the QSDC quantum direct communication device transmits a part of the quantum optical pulse, the node control unit 110 located at the same user access node or relay node transmits the measurement basis vector and the position information through the classical channel. The quantum light pulse carries the effective information through the quantum state, and if the effective information is intercepted or measured by an eavesdropper midway, the quantum state of the quantum light pulse collapses. The receiver of a part of quantum light pulses receives the measurement basis vector and the position information sent by the classical channel at the same time or later, completes the basis according to the measurement basis vector and the position information, determines the detection error rate, and can determine whether the phenomenon that the quantum light pulses are measured exists in the transmission process, thereby detecting the transmission safety of the quantum channel.
After completing the channel security detection, the node control units 110-1, 110-2, and 110-3 transmit a channel initialization completion instruction to the central control unit 120, and the central control unit 120 transmits a communication start instruction in response to the channel initialization completion instruction transmitted by the node control units 110-1, 110-2, and 110-3.
The node control units 110-1, 110-2 and 110-3 control QSDC quantum direct communication devices located at the same access node or relay node to start the interactive process of preparation, transmission and reception and measurement of quantum pulses.
The node control unit 110 is configured to upload and download data between the QSDC quantum direct communication device and the user terminal during quantum direct communication. The method specifically comprises the following steps:
transmitting data to be transmitted sent by a user terminal to quantum direct communication equipment for coding (prepared on a quantum pulse) and sending; and/or
And decoding the transmission data received by the quantum direct communication equipment and then forwarding the transmission data to the user terminal.
When any party in mutual communication sends a request for ending communication, a user terminal of a user access node where the node control unit 110-2 is located is not set to send a request for ending communication, the user terminal sends an ending request to the node control unit 110-2 of the user access node where the node control unit is located, the node control unit 110-2 sends an ending request instruction to the central control unit 120, the central control unit 120 sends an ending communication instruction to other node control units 110-1 and 110-3 which are ended passively, quantum channel resources are recycled, and a channel resource list is updated.
The control system for the quantum communication network provided by the invention is characterized in that each node of the quantum communication network is provided with a node control unit, the central control unit is used for overall planning each node control unit, the central control unit responds to a communication request instruction sent by each node control unit, selects a proper quantum channel, sends a channel switching instruction, responds to a channel switching completion instruction, a channel initialization completion instruction and an ending request instruction sent by each node control unit, respectively sends a channel initialization instruction, a communication start instruction and an ending communication instruction, and cooperatively cooperates with each node control unit through the central control unit, so that the communication efficiency and the communication safety of quantum direct communication equipment are ensured, and meanwhile, the quantum channel is selected through a preset algorithm, so that the attenuation and the loss of quantum optical signals in the transmission process are avoided.
The present invention also provides an improvement to the node control unit 110 disposed in the user access node or the relay node, which is introduced as follows:
according to an embodiment of the present invention, as shown in fig. 4, the node control unit 110 includes: at least three ethernet interfaces 111 (111-1, 111-2, 111-3 as shown in the figure), wherein:
the node control unit 110 is connected to the central control unit 120 through a first ethernet interface (111-1 as shown in the figure); the quantum secure direct communication device 200 is connected with a second Ethernet interface (111-2 shown in the figure); connected to the user terminal 300 through a third ethernet interface (111-3 as shown in the figure). The node control unit 110 is configured to:
the data to be transmitted sent by the user terminal 300 is forwarded to the quantum secure direct communication device 120; and/or
Forwarding the transmission data received by the quantum secure direct communication device 120 to the user terminal 300;
wherein the first ethernet interface 111-1 is closed upon data exchange with the user terminal 300 and/or the quantum secure direct communication device 120.
According to an embodiment of the present invention, the at least three ethernet interfaces 111 respectively include an ethernet connector and an ethernet interface circuit, and optionally, the ethernet interface circuit of the first ethernet interface 111-1 is designed as an independent circuit, so that the node control unit 110 can independently control the first ethernet interface 111-1 to be turned on or off, that is, physically isolate a line connected to the central control unit 120 of the quantum secure direct communication network.
According to an embodiment of the present invention, as shown in fig. 4, the control system 100 for a quantum communication network further includes a channel switching component 130 disposed at a user access node or a relay node, where the channel switching component 130 is communicatively connected to the node control unit 110. The node control unit 110 is further configured to:
and receiving a channel switching instruction issued by the quantum central control unit 120, and controlling the channel switching component 130 to switch to the corresponding quantum channel according to the channel switching instruction.
According to an embodiment of the invention, the node control unit 110 is further configured to:
when the control system 100 is in a cold start, the node control program is loaded, the initialization of the node control program is completed, the peripheral units are initialized in sequence, and the detection and alarm functions of the peripheral units are realized, wherein the node control unit 110 runs the node control program and includes:
the communication request sent by the user terminal 300 is received, and meanwhile, the data to be transmitted (i.e., the communication data packet) sent by the user terminal 300 is received and stored, and the data to be transmitted is forwarded to the vector secure direct communication device 120.
The communication request sent by the user terminal 300 is analyzed, the routing information and the access terminal device type of the user terminal 300 are obtained, a communication request instruction is sent to the central control unit 120, and the routing information and the access terminal device type of the user terminal 300 are sent to the central control unit 120. The access terminal device type of the user terminal 300 is transmitted to the quantum secure direct communication device 200.
Receiving a channel switching instruction issued by the central control unit 120, where the channel switching instruction includes a route distribution data packet, analyzing the route distribution data packet to obtain a route lookup table, and determining a channel to be switched according to the route lookup table.
The quantum secure direct communication device 200 is controlled for channel initialization.
According to an embodiment of the invention, the node control unit 110 further comprises a storage unit, the node control unit 110 being further configured to:
receiving data to be transmitted sent by the user terminal 300 and storing the data in a storage unit;
after the data to be transmitted stored in the storage unit is forwarded to the quantum secure direct communication device 200, the data to be transmitted in the storage unit is deleted.
According to an embodiment of the present invention, when the node receives transmission data (i.e. communication data packet) sent by another node as a receiving party of both communication parties, the node control unit 110 is further configured to:
receiving the received transmission data sent by the quantum secure direct communication device 200 and storing the transmission data in a storage unit;
after the transmission data stored in the storage unit is forwarded to the user terminal 300, the transmission data in the storage unit is deleted.
According to an embodiment of the invention, the node control unit 110 is further configured to:
controlling the quantum secure direct communication device 200 to start channel initialization and stopping forwarding data to be transmitted, which is sent by the user terminal 300, to the quantum secure direct communication device 200;
after the quantum secure direct communication device 200 completes the channel initialization, the data to be transmitted sent by the user terminal 300 is continuously forwarded to the quantum secure direct communication device 200.
In the process of channel initialization of the quantum secure direct communication device 200, the node control unit 110 stops forwarding data (communication data packets) to be transmitted, after the quantum secure direct communication device 200 completes initialization, optionally, an initialization completion instruction is sent to the node control unit 110, after receiving the initialization completion instruction, the node control unit 110 continues forwarding the data (communication data packets) to be transmitted stored in the storage unit, and the quantum secure direct communication device 200 sends the received data (communication data packets) to be transmitted to the quantum secure direct communication device 200 of the receiver node through a quantum channel (such as a section of optical fiber path or a section of optical fiber path passing through a relay node).
In the control system 100, the channel switching component 130 further includes: level shifters and optical switch arrays. Wherein:
the level shifter is connected to the node control unit 110, and configured to receive the electrical signal sent by the node control unit 110 and convert the electrical signal into a multiplexed output voltage.
The optical switch array is connected to the level shifter at one end and to the multiplexed optical fiber at another end, and is configured to turn on or off one or more optical switches in the optical switch array 132 by the multiplexed output voltage output by the level shifter. The multiple optical fibers are quantum channels for transmitting data, and each optical fiber is connected with another node (a user access node or a relay node) in the quantum secure direct communication network.
The node control unit 110 receives a routing distribution data packet sent by the central control unit 120 of the quantum secure direct communication network, analyzes the routing distribution data packet, and obtains a routing lookup table, where the routing lookup table is determined by the layout of the optical switch array, and the node control unit 110 determines an optical fiber path to be connected according to the routing lookup table.
In the control system 100, according to an embodiment of the present invention, the node control unit 110 is further configured to:
transmitting a channel switching completion instruction to the central control unit 120;
after receiving the channel switching completion instruction sent by the multiple node control units 110 on the selected first quantum channel, the central control unit 120 issues a channel initialization instruction;
after receiving the channel initialization instruction, the node control unit 110 controls the quantum secure direct communication device 200 to perform channel initialization. The quantum secure direct communication device 200 performs channel initialization, including: the method comprises the steps of line quantum state preparation, quantum optical pulse signal sending, quantum optical pulse detection data receiving, data screening and basis and error rate index statistics. After channel initialization, statistical index data such as error rate and counting rate meet requirements, and at the moment, quantum secure direct communication equipment of two communication parties reaches a state capable of secure communication, namely secure transmission of communication data can be carried out.
According to an embodiment of the invention, the control system 100 further comprises: a power supply unit and a clock unit.
The power supply unit is configured to provide power to the at least three ethernet interfaces 112, the node control unit 110, and the channel switching component 130;
the clock unit is configured to provide a clock pulse signal for the node control unit 110 to receive the channel switching instruction and the channel initialization instruction in real time.
According to an embodiment of the present invention, in the control system 100, the node control unit 110 may be connected to a plurality of user terminals 300 through a plurality of ethernet interfaces 111, respectively, or may be connected to a plurality of user terminals 300 through a hub or the like, so as to complete quantum secure direct communication between different user terminals of the same user access node.
According to one embodiment of the present invention, the TCP protocol is applied between the node control unit 110 and the central control unit 120, the quantum secure direct communication device 200, and the user terminal 300; the quantum secure direct communication protocol is applicable between quantum secure direct communication devices of a plurality of nodes of the quantum secure direct communication network.
The node control unit provided by the invention is optionally arranged on each node of the quantum secure direct communication network. When a certain user terminal on the node has a communication requirement, a communication request is sent to the node control unit through the corresponding Ethernet interface, and meanwhile, the transmission data is forwarded to the vector safety direct communication equipment through the node control unit. After the node control unit analyzes the communication request, the node control unit sends a communication request instruction comprising the routing information of the terminal user and the type of the terminal equipment to the central control unit through a corresponding Ethernet interface. After receiving the communication request instruction, the central control unit selects a proper quantum channel, and sends a channel switching instruction to the node control units of the two communication parties on the vector subchannel and the node control unit of the relay node, wherein the channel switching instruction comprises a routing data packet, and after receiving the routing data packet, the node control unit determines the quantum channel (such as an optical fiber path) to be connected through a routing lookup table. The node control unit controls the optical switch array through the level shifter, connects the corresponding optical fiber path, and the quantum secure direct communication equipment performs channel initialization (preheating). After the channel initialization is completed, the node control unit continues to forward the communication data packet. The quantum secure direct communication device transmits the transmission data to the next node on the quantum channel through the connected optical fiber path. After one or more times of forwarding, the quantum secure direct communication device of the final node receives the transmission data and forwards the transmission data to the user terminal through the node control unit of the node. The quantum secure direct communication equipment, the user terminal, the central control unit and the node control units of the network nodes are connected through Ethernet cables and are suitable for a TCP (transmission control protocol), and the quantum secure direct communication equipment between every two nodes is connected through a quantum channel (such as optical fiber) through the node control units between every two nodes and is suitable for a quantum secure direct communication protocol.
According to an embodiment of the present invention, as shown in fig. 5, the present invention further provides a method 10 for controlling a quantum communication network using the control system 100 as described above, including steps S101 to S102. Wherein:
in step S101, a request sent by the first node control unit to communicate with the second node control unit is received by the central control unit, a first quantum channel of the multiple quantum channels is selected, and a channel switching instruction is sent to the first node control unit and the second node control unit.
Wherein the plurality of node control units further comprises a third node control unit, and the first quantum channel is coupled with the first node control unit and the second node control unit via the third node control unit.
In step S102, a channel switching instruction is sent to the third node control unit by the central control unit.
According to an embodiment of the invention, the method 10 of controlling a quantum communication network further comprises:
responding to the channel switching completion instruction sent by the first node control unit, the second node control unit and the third node control unit, and sending a channel initialization instruction to the first node control unit, the second node control unit and the third node control unit through the central control unit;
responding to channel initialization completion instructions sent by the first node control unit, the second node control unit and the third node control unit, and sending communication start instructions to the first node control unit, the second node control unit and the third node control unit through the central control unit;
and responding to an ending request instruction sent by the first node control unit or the second node control unit, and sending an ending communication instruction to a passively ended node control unit through the central control unit.
The present invention also provides, according to an embodiment of the present invention, a non-transitory computer readable storage medium having stored thereon computer readable instructions which, when executed by a processor, cause the processor to perform the method 10 of controlling a quantum communication network as described above.
Claims (11)
1. A control system for a quantum communication network, comprising:
a plurality of node control units comprising a first node control unit and a second node control unit, the plurality of node control units coupled by a plurality of quantum channels;
a central control unit, coupled to the node control units, respectively, and configured to receive a request sent by the first node control unit to communicate with the second node control unit, select a first quantum channel of the plurality of quantum channels, and send a channel switching instruction to the first node control unit and the second node control unit.
2. The control system of claim 1, wherein the plurality of node control units further comprises a third node control unit, the first quantum channel coupled with the first node control unit, the second node control unit via the third node control unit, the central control unit further configured to:
and sending a channel switching instruction to the third node control unit.
3. The control system of claim 1 or 2, wherein the central control unit is further configured to:
and selecting the first quantum channel by adopting a preset algorithm according to the topological structure of the quantum communication network and the occupation conditions of the plurality of quantum channels.
4. The control system of claim 2, wherein the node control unit is provided to a user access node or a relay node.
5. The control system of claim 4, wherein the node control unit is coupled to the QSDC quantum direct communication devices and the user terminals, respectively, at the same user access node, the node control unit configured to:
forwarding the data to be transmitted sent by the user terminal to the quantum direct communication equipment; and/or
And forwarding the transmission data received by the quantum direct communication equipment to the user terminal.
6. The control system of claim 4, further comprising: a channel switching component, disposed at a user access node or a relay node, and coupled to the node control unit located at the same node, where the node control unit is further configured to:
and responding to the channel switching instruction, and controlling the channel switching components located in the same node to switch to the corresponding quantum channels.
7. The control system of claim 6, wherein the node control unit is further configured to:
after the channel switching component is switched to the corresponding quantum channel, a channel switching completion instruction is sent to the central control unit;
the central control unit is further configured to:
and responding to the channel switching completion instruction sent by the first node control unit, the second node control unit and the third node control unit, and sending a channel initialization instruction to the first node control unit, the second node control unit and the third node control unit.
8. The control system of claim 7, wherein the central control unit is further configured to:
responding to a channel initialization completion instruction sent by the first node control unit, the second node control unit and the third node control unit, and sending a communication start instruction to the first node control unit, the second node control unit and the third node control unit;
and responding to an ending request instruction sent by the first node control unit or the second node control unit, and sending an ending communication instruction to a passively ended node control unit.
9. A method of controlling a quantum communication network using a control system according to any one of claims 1 to 8, comprising:
and receiving, by the central control unit, a request sent by the first node control unit to communicate with the second node control unit, selecting a first quantum channel of the plurality of quantum channels, and sending a channel switching instruction to the first node control unit and the second node control unit.
10. The method of claim 9, wherein the plurality of node control units further comprises a third node control unit, the first quantum channel coupled with the first node control unit, the second node control unit via the third node control unit, the method further comprising:
and sending a channel switching instruction to the third node control unit through the central control unit.
11. A non-transitory computer readable storage medium having stored thereon computer readable instructions which, when executed by a processor, cause the processor to perform the method of claim 9 or 10.
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| CN202211119683.3A CN115664537A (en) | 2022-09-14 | 2022-09-14 | Control system and control method for quantum communication network |
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Inventor after: Chen Xiuwei Inventor after: Pan Dong Inventor after: Long Guilu Inventor after: Zhang Feihao Inventor after: Niu Penghao Inventor after: Zhang Chunsheng Inventor after: Guo Jianxing Inventor after: Wang Min Inventor after: Zhang Wei Inventor after: Song Xiaotian Inventor before: Long Guilu Inventor before: Pan Dong Inventor before: Chen Xiuwei Inventor before: Zhang Feihao Inventor before: Niu Penghao Inventor before: Zhang Chunsheng Inventor before: Guo Jianxing Inventor before: Wang Min Inventor before: Zhang Wei Inventor before: Song Xiaotian |