CN206135936U - Quantum key dispensing apparatus's automatic configuration system - Google Patents
Quantum key dispensing apparatus's automatic configuration system Download PDFInfo
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- CN206135936U CN206135936U CN201620837784.8U CN201620837784U CN206135936U CN 206135936 U CN206135936 U CN 206135936U CN 201620837784 U CN201620837784 U CN 201620837784U CN 206135936 U CN206135936 U CN 206135936U
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Abstract
The utility model discloses a quantum key dispensing apparatus's automatic configuration system, transmitting terminal include quantum light laser instrument, an optical attenuator, encoder, close solely ware, the 2nd optical attenuator and synchronous light laser instrument, the receiving terminal includes spectrometer, decoder, synchronous light detector, delay timer and single -photon detector, the spectrometer is used for with together two way light signals separately, synchronous light detector is used for receiving the synchronous light pulse after surveying separately to output synchronization clock signal, the synchronized clock signal is used for triggering single -photon detector after the delay timer time delay, the decoder is used for the single photon horizontally quantum photodissociation sign indicating number after paring, single -photon detector is used for surveying single photon horizontally quantum light of being decoded. The utility model discloses has simplified the configuration process of equipment in actual circuit, has reduced the professional requirement of equipment to personnel, simultaneously greatly reduced the maintenance cost of network.
Description
Technical field
This utility model belongs to Quantum Secure Communication field, is related to be used in fact in quantum-key distribution (QKD) system
The automatic configuration of existing quantum-key distribution equipment, more particularly to a kind of automatic configuration system of quantum-key distribution equipment.
Background technology
Quantum secret communication combines quantum physics principle and modern communication technology.Quantum secret communication passes through quantum physics
Principle ensures the safety of strange land cipher key agreement process and result, is combined with " one-time pad " encryption technology, it is possible to achieve disobey
The secret communication of bad algorithm complex.The basis of quantum secret communication is quantum-key distribution (QKD), and quantum-key distribution is utilized
Principle of quantum mechanics, achievable communicating pair consults the key of unconditional security, and will not be by unauthorized third party
Eavesdropping.
Quantum Secure Communication has moved towards practical application from laboratory.Build all over the world or construction amount
Sub- secure communication network：U.S. DARPA in 2007 is illustrated and is built the quantum secret communication network planning for covering the whole nation；12, Europe
Country has built up the quantum secret communication network of 5 nodes in October, 2008 in Vienna, thereafter nodes is expanded to into 8；
Japan built up Tokyo quantum cryptography networks in 2010；China built up first " quantum E-gov Network " in 2009 in Wuhu；
" the Beijing-Shanghai quantum secure main line " more than 1000 kilometers will be built up within 2016；The application of Quantum Secure Communication has been opened up
Open.
The network level structure of these quantum secret communication nets is generally divided into three layers, and ground floor is quantum-key distribution layer,
It is made up of quantum-key distribution equipment and quantum route exchange device, for distributing quantum key between each user；The second layer
Be quantum key management and service layer, for realize key management and to user provide cipher key service；Third layer is that quantum is close
Key application layer, is made up of various cipher application equipment, such as various encryption equipments, VPN etc., and these cipher application equipment receive second
The key that layer is provided, and the information to be transmitted is encrypted, so as to realize secret communication.
In quantum secret communication network, quantum-key distribution equipment needs to be deployed on each communication node, to meet
Secret communication demand between each node.And the actual track environment (distance and Line Attenuation between node etc.) between each node
It is more complicated, in order to be able to make quantum-key distribution equipment working properly, need to configure device parameter according to the practical situation of circuit.
If circuit changes, device parameter needs corresponding adjustment.This problem causes equipment to have to be matched somebody with somebody in erecting bed
Put and debug, and equipment is before dispatching from the factory from can also carry out parameter configuration, the parameter being configured so that may because of with actual rings
Border does not meet and changes.In addition, during subsequent use, if the line environment of network is changed, equipment is needed also exist for
Readjust parameter.
Utility model content
Technical problem to be solved in the utility model is the deficiency for above-mentioned existing quantum key distributing equipment, there is provided
A kind of automatic configuration system of quantum-key distribution equipment, the automatic configuration simple system of this quantum-key distribution equipment has
Effect, can in real time configure three important parameters related to line environment in equipment or system, realize equipment or system to circuit ring
The self adaptation in border and automatically configure, simplify equipment or system installation and debugging process and use during maintenance, drop significantly
The low quantum network operation cost in later stage.
To solve above-mentioned technical problem, the technical scheme that this utility model is taken is：
The automatic configuration system of quantum-key distribution equipment, including transmitting terminal and receiving terminal；It is characterized in that：
Transmitting terminal includes quantum light laser, the first optical attenuator, encoder, splicer, the second optical attenuator and synchronization
Light laser；
Quantum light laser is used to send laser pulse；First optical attenuator is used to for laser pulse to decay to single photon water
It is flat, form the quantum light of single photon level；Encoder is used to encode the quantum light of single photon level；Encoder is by phase modulation
Device and interference ring are constituted；Synchronous light laser is used to send synchronizable optical；Second optical attenuator is used for synchronous optical attenuation, to produce
Synchronous light pulse；Splicer is used to be combined the quantum light of synchronous light pulse and single photon level, into common signal channel, leads to
Cross after common signal channel and reach receiving terminal；
Receiving terminal includes beam splitter, decoder, synchronous photo-detector, chronotron and single-photon detector；
Beam splitter is used to separate the two ways of optical signals being combined；Synchronous photo-detector is used to receive after detection separately
Synchronous light pulse, and export synchronizing clock signals；The synchronizing clock signals are used for triggering single photon after chronotron time delay
Detector；Decoder is used for the quantum light decoding of the single photon level after separating；Single-photon detector is decoded for detection
Single photon level quantum light.
Used as the further improved technical scheme of this utility model, encoder is by phase converter and interferes ring group
Into；By loading different voltages to phase converter, different phase places can be modulated.
Used as the further improved technical scheme of this utility model, common signal channel is optical fiber or free space.
In quantum secret communication network, quantum-key distribution equipment needs to be deployed on each communication node, to meet
Secret communication demand between each node.And the actual track environment (distance and Line Attenuation between node etc.) between each node
It is more complicated, in order to be able to make quantum-key distribution equipment working properly, need to configure device parameter according to the practical situation of circuit.
If circuit changes, device parameter needs corresponding adjustment.This problem causes equipment to have to be matched somebody with somebody in erecting bed
Put and debug, and equipment is before dispatching from the factory from can also carry out parameter configuration, the parameter being configured so that may because of with actual rings
Border does not meet and changes.In addition, during subsequent use, if the line environment of network is changed, equipment is needed also exist for
Readjust parameter.
This utility model is directed to the automatic of the quantum-key distribution equipment of the BB84 based on phase code (or B92) agreement
Change configuration system, be capable of achieving equipment or system to the self adaptation of line environment and automatically configure, simplify the reality of equipment or system
Border installation process, reduces the requirement of equipment or system to professional, while greatly reducing the maintenance cost of network.
Description of the drawings
Fig. 1 is structural representation of the present utility model.
Specific embodiment
Embodiment 1
Referring to Fig. 1, the automatic configuration system of this quantum-key distribution equipment, including transmitting terminal and receiving terminal；Transmitting terminal
Including quantum light laser, the first optical attenuator, encoder, the second optical attenuator, splicer, the second optical attenuator and synchronizable optical
Laser instrument；Quantum light laser is used for the laser pulse for sending；First optical attenuator is used to for laser pulse to decay to single photon
Level, forms the quantum light of single photon level；Encoder is used to encode the quantum light of single photon level；Encoder is by adjusting
Phase device and interference ring are constituted；Synchronous light laser is used to send synchronizable optical；Second optical attenuator is used for synchronous optical attenuation, to produce
Raw synchronization light pulse；Splicer is used to be combined the quantum light of synchronous light pulse and single photon level, into common signal channel,
Receiving terminal is reached after common signal channel；Receiving terminal includes beam splitter, decoder, synchronous photo-detector, chronotron and single photon
Detector；Beam splitter is used to separate the two ways of optical signals being combined；Synchronous photo-detector is used to receive after detection separately
Synchronous light pulse, and export synchronizing clock signals；The synchronizing clock signals are used for triggering single-photon detector；Decoder is used for
By the quantum light decoding of the single photon level after separating；Single-photon detector is used for the quantum of the single photon level that detection is decoded
Light.Encoder is constituted by phase converter and interference ring；By loading different voltages to phase converter, can modulate not
Same phase place.Common signal channel is optical fiber or free space.Other parts are same as Example 1, no longer describe in detail.
BB84 (or B92) agreement of this utility model based on phase code, such as Fig. 1.The quantum light laser of transmitting terminal is sent out
The laser pulse for going out, Jing after the optical attenuator of light first decays to single photon level, is encoded into encoder.Encoder is by phase modulation
Device and interference ring are constituted.Different voltages are loaded to phase converter, different phase places can be modulated.Simultaneously transmitting terminal also has one together
Step light laser, Jing after the decay of the optical attenuator of light second, produces synchronous light pulse, then passes through with the quantum light of single photon level
Splicer is combined, into common signal channel.Common signal channel can be optical fiber, or free space.Here it is with optical fiber
Example description.Receiving terminal is reached after common signal channel, receiving terminal beam splitter separates two ways of optical signals.Synchronous light pulse is same
Step photo-detector is received after detection, synchronizing clock signals is exported, for triggering single-photon detector.The quantum light of single photon level
It is decoded into decoder.Decoder is typically made up of phase converter and interference ring.The quantum light being decoded is finally by single-photon detecting
Survey device detection.In this system, three parameters need to be adjusted according to the practical situation of common signal channel.First is synchronous
The light intensity of light.Synchronous photo-detector output is synchronizing clock signals, and mistake can not occur in synchronizing clock signals, it is therefore necessary to
After step of seeking common ground light pulse is decayed by common signal channel, still can be detected by synchronous photo-detector.When the minimum of synchronous photo-detector
The timing of detection of optical power one, the decay of common signal channel is bigger, then require that the light intensity of synchronizable optical is bigger.Second is single-photon detector
Door triggered time window.When common signal channel is optical fiber, the single-photon detector for being used typically triggers pattern using door, i.e.,
Single-photon detector can detect single photon signal within the time that door is triggered, and single photon letter cannot be detected when triggering without door
Number.At this moment require that single photon signal reaches the time window of single-photon detector and must fall in the time window of door triggering, it is single
Photon detector could effectively detect single photon signal.After single photon signal sends from transmitting terminal laser instrument, through the first light decay
Subtract the time delay of device and encoder, the time delay of common signal channel reaches receiving terminal, then through the time delay of decoder, finally reaches monochromatic light
Sub- detector.Door trigger is that the synchronizing clock signals exported by synchronous photo-detector are produced.And the spy of synchronous photo-detector
It is the synchronous light pulse sent by transmitting terminal synchronization light laser to survey output, through the time delay of the second optical attenuator, common signal channel
Time delay, reach receiving terminal after be detected.Delay inequality of the common signal channel to two-way light, can be with the length of common signal channel difference
It is different.The time delay of the door triggered time window of regulation single-photon detector is so accomplished by, a position for triggered time window is made
Change as the length of common signal channel is different, ensure that single photon signal reaches single-photon detector time window and falls in door triggering
Time window in.3rd is the phase modulation voltage of the phase converter in codec.Need during encoding and decoding different to phase converter loading
Phase modulation voltage, so as to obtain different phase modulation results.And the phase modulation result of this phase converter is typically related to the polarization state of light.
And common signal channel can change the polarization state of light, so as to change the phase modulation result of phase converter.Therefore need to take certain measure, protect
Barrier phase modulation result is not affected by common signal channel.
Analyze based on more than, 1) synchronizable optical Light Intensity Scanning；2) single-photon detector delayed sweep；3) phase converter phase modulation voltage
Scan these three processes correspond to respectively above-mentioned synchronizable optical light intensity, chronotron time delay, three parameters of phase converter phase modulation voltage from
Dynamic configuration.Three above scanning process is completed by combined with hardware realization, and the result for obtaining feeds back to system, and system again will knot
Fruit is allocated to related device or module, so as to realize automatically configuring for parameter.
Claims (3)
1. a kind of automatic configuration system of quantum-key distribution equipment, including transmitting terminal and receiving terminal；It is characterized in that：
Transmitting terminal swashs including quantum light laser, the first optical attenuator, encoder, splicer, the second optical attenuator and synchronizable optical
Light device；
Quantum light laser is used to send laser pulse；First optical attenuator is used to for laser pulse to decay to single photon level,
Form the quantum light of single photon level；Encoder is used to encode the quantum light of single photon level；Encoder is by phase converter
With interference ring composition；Synchronous light laser is used to send synchronizable optical；Second optical attenuator is used for synchronous optical attenuation, same to produce
Step light pulse；Splicer is used to be combined the quantum light of synchronous light pulse and single photon level, into common signal channel, passes through
Receiving terminal is reached after common signal channel；
Receiving terminal includes beam splitter, decoder, synchronous photo-detector, chronotron and single-photon detector；
Beam splitter is used to separate the two ways of optical signals being combined；Synchronous photo-detector is used to receive the synchronization after detection separates
Light pulse, and export synchronizing clock signals；The synchronizing clock signals are used for triggering single photon detection after chronotron time delay
Device；Decoder is used for the quantum light decoding of the single photon level after separating；Single-photon detector is used for the list that detection is decoded
The quantum light of photon level.
2. the automatic configuration system of quantum-key distribution equipment according to claim 1, it is characterised in that：Encoder and
Decoder is constituted by phase converter and interference ring；By loading different voltages to phase converter, different phase places can be modulated.
3. the automatic configuration system of quantum-key distribution equipment according to claim 1 and 2, it is characterised in that：It is public
Channel is optical fiber or free space.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620837784.8U CN206135936U (en) | 2016-08-04 | 2016-08-04 | Quantum key dispensing apparatus's automatic configuration system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196758A (en) * | 2017-06-01 | 2017-09-22 | 浙江九州量子信息技术股份有限公司 | A kind of single photon detection method based on quantum key distribution |
| CN109946551A (en) * | 2019-05-22 | 2019-06-28 | 北京中创为南京量子通信技术有限公司 | It is a kind of for testing laser source, the device of detector and its test method |
| CN113541819A (en) * | 2020-12-30 | 2021-10-22 | 广东国腾量子科技有限公司 | Time synchronization system for quantum key distribution |
-
2016
- 2016-08-04 CN CN201620837784.8U patent/CN206135936U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196758A (en) * | 2017-06-01 | 2017-09-22 | 浙江九州量子信息技术股份有限公司 | A kind of single photon detection method based on quantum key distribution |
| CN109946551A (en) * | 2019-05-22 | 2019-06-28 | 北京中创为南京量子通信技术有限公司 | It is a kind of for testing laser source, the device of detector and its test method |
| CN113541819A (en) * | 2020-12-30 | 2021-10-22 | 广东国腾量子科技有限公司 | Time synchronization system for quantum key distribution |
| CN113541819B (en) * | 2020-12-30 | 2023-12-19 | 广东国腾量子科技有限公司 | Time synchronization system for quantum key distribution |
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