CN111786784A - Method for distributing and accessing uplink continuous variable quantum key - Google Patents
Method for distributing and accessing uplink continuous variable quantum key Download PDFInfo
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- CN111786784A CN111786784A CN202010663335.7A CN202010663335A CN111786784A CN 111786784 A CN111786784 A CN 111786784A CN 202010663335 A CN202010663335 A CN 202010663335A CN 111786784 A CN111786784 A CN 111786784A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
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Abstract
The invention provides an uplink continuous variable quantum key distribution access network method. In the scheme, a plurality of continuous variable quantum key distribution transmitting terminals simultaneously generate quantum signal light and phase reference light, the quantum signal light and the phase reference light are transmitted to an optical splitter and then coupled into a path of signal, and the signal is measured by one continuous variable quantum key distribution receiving terminal; the continuous variable quantum key distribution receiving end locally generates pulse signals as local oscillation light, and the heterodyne detector is used for detecting the phase reference light and the quantum signal light, so that phase estimation and key distribution are realized. The scheme avoids the transmission of local oscillation light in unsafe channels, greatly improves the spectrum efficiency of an access network, reduces the load of multi-channel signal light during coupling, and obviously reduces the mutual influence among signals. The continuous variable quantum key distribution receiving end provides locally generated local oscillation light for the quantum signal light and the phase reference light from different continuous variable quantum key distribution transmitting ends, and the structure of the continuous variable quantum key distribution transmitting end is further simplified.
Description
Technical Field
The invention relates to the field of continuous variable quantum key distribution, in particular to an uplink continuous variable quantum key distribution access network method.
Background
The continuous variable quantum key distribution can use mature commercial optical devices, and has potential advantages in practical application. At present, outfield tests of continuous variable quantum key distribution have been developed in a plurality of countries, and the continuous variable quantum key distribution technology is rapidly stepping into the application stage. The access network is an important place in network construction as a connection between a backbone network and a user terminal. The uplink access network scheme of the current continuous variable quantum key distribution needs quantum signal light and local oscillator light to be transmitted together, and the structure of a continuous variable quantum key distribution transmitting end serving as a user end is still complex; meanwhile, local oscillator light may be attacked by an eavesdropper in a channel, so that potential safety hazards are brought to a system; aiming at the attacks, an additional monitoring module needs to be added at a continuous variable quantum key distribution receiving end, so that the system becomes more complex; due to the transmission of the local oscillation light, the load of a plurality of paths of signals is increased when the signals are coupled through the optical splitter, and the requirement on signal control is higher; these factors are not favorable for the implementation of the uplink access network for multiple users in practical scenarios.
Disclosure of Invention
Aiming at the defects in the prior art, the patent discloses an uplink continuous variable quantum key distribution access network method. The sending end system structure is simplified, and meanwhile, the attack of an eavesdropper on the local oscillator light in a channel is avoided; because local oscillator light does not need to be transmitted, the frequency spectrum efficiency of the signals can be further improved, and the mutual influence among the signals is reduced. The invention lays a foundation for the large-scale practicability of the continuous variable quantum key distribution access network.
The invention provides an uplink continuous variable quantum key distribution access network method, which is characterized by comprising the following steps:
step 1: n continuous variable quantum key distribution transmitting ends with the same wavelength prepare signal light, wherein the signal light comprises quantum signal light and phase reference light;
the step 1 comprises the following steps:
step 1 a: a continuous variable quantum key distribution sending end prepares a pulse signal by matching a laser or a laser with an intensity modulator;
step 1 b: pulse signals pass through a modulation module, wherein most of the pulse signals are modulated into quantum signal light, and the rest of the pulse signals are modulated into phase reference light;
step 1 c: the signal light passes through an attenuator to enable the quantum signal light to be attenuated to a proper level;
step 2: the n continuous variable quantum key distribution transmitting ends transmit the prepared signal light to corresponding delay lines, and then the signal light is coupled into 1 path of signal light through an optical splitter; the signal light is then sent to a continuous variable quantum key distribution receiving end;
and step 3: the continuous variable quantum key distribution receiving end generates local oscillation light pulses by utilizing a local laser or a local laser matched with an intensity modulator;
and 4, step 4: the local oscillation light pulse compensates the phase through the phase modulator, and then enters the heterodyne detector together with the signal light for detection, so that the extraction of the original key and the estimation of the phase difference are realized.
The technical points of step 2 are specifically described as follows:
before the n paths of signal light pass through the optical splitter, the time of the signal light reaching the optical splitter is calibrated through the delay line pair respectively, so that the n paths of signal light enter the optical splitter in sequence without overlapping.
The technical points of step 4 are specifically described as follows:
the local oscillator light and the phase reference light simultaneously measure an x component and a p component through a heterodyne detector; calculating the phase difference between the phase reference light and the local oscillator light according to the measurement result; and then compensating the phase of the local oscillation optical pulse through a phase modulator.
The technical points of step 4 are specifically described as follows:
and the local oscillator light and the quantum signal light which are subjected to phase compensation simultaneously measure the x component and the p component through a heterodyne detector.
The invention provides an uplink continuous variable quantum key distribution access network method which is characterized in that a local laser of a continuous variable quantum key distribution receiving end simultaneously provides local oscillator light for signal light of n continuous variable quantum key distribution transmitting ends, and quantum key distribution is realized. The invention realizes a many-to-one uplink quantum access network structure for realizing key distribution by a plurality of continuous variable quantum key distribution transmitting terminals and a continuous variable quantum key distribution receiving terminal by using a local oscillation scheme. Compared with the prior art, the invention does not need to transmit local oscillator light, greatly relieves the load of multi-channel signals when the optical branching devices are coupled, improves the spectral efficiency of quantum signal light, and greatly reduces the mutual influence among the signals; meanwhile, local oscillation light does not need to be generated by a continuous variable quantum key distribution sending end, so that sending end equipment can be further simplified, and actual deployment of an uplink access network is facilitated; the local oscillator light does not need to be transmitted, so that an eavesdropper in a channel is prevented from attacking the local oscillator light; the local oscillator light is locally generated by a continuous variable quantum key distribution receiving end, so that the power of the local oscillator light is ensured, and the detection of the quantum signal light is facilitated.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic structural diagram of a transmitting end for distributing continuous variable quantum keys according to the present invention.
Fig. 3 is a schematic diagram of a structure of a continuous variable quantum key distribution receiving end according to the present invention.
Detailed Description
Specific embodiments of the present invention will be described below with reference to the accompanying drawings. The following examples are provided by way of illustration in order to fully convey the spirit of the invention to those skilled in the art to which the invention pertains. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1, a method for an uplink continuous variable quantum key distribution access network includes the following steps:
1. the access network adopts an uplink structure, that is, the sending end for continuously variable quantum key distribution of n user terminals sends the key to the receiving end for continuously variable quantum key distribution of the network node terminal at the same time, as shown in fig. 1.
2. The schematic structural diagram of the continuous variable quantum key distribution transmitting terminal is shown in fig. 2, and n continuous variable quantum key distribution transmitting terminals with the same wavelength prepare signal light, wherein the signal light includes quantum signal light and phase reference light. A continuous variable quantum key distribution sending end prepares a pulse signal through a laser or a laser and an intensity modulator; pulse signals pass through a modulation module, wherein most of the pulse signals are modulated into quantum signal light, and the rest of the pulse signals are modulated into phase reference light; the signal light, including the quantum signal light and the phase reference light, passes through the attenuator, so that the quantum signal light is attenuated to a proper level, and then is transmitted into the network.
The n continuous variable quantum key distribution transmitting ends transmit the prepared signal light to corresponding delay lines, and then the signal light is coupled into 1 path of signal light through an optical splitter; the signal light is then sent to a continuous variable quantum key distribution receiving end.
4. Fig. 3 shows a schematic structural diagram of a continuous variable quantum key distribution receiving end, where the continuous variable quantum key distribution receiving end generates a local oscillation optical pulse by using a local laser or a local laser in cooperation with an intensity modulator.
5. The local oscillator light and the phase reference light simultaneously measure an x component and a p component through a heterodyne detector; calculating the phase difference between the phase reference light and the local oscillator light according to the measurement result; then compensating the phase of the phase difference through a phase modulator;
6. and the local oscillator light and the quantum signal light which are subjected to phase compensation simultaneously measure the x component and the p component through a heterodyne detector, so that the extraction of the original key is realized.
It can be seen from the above examples that the present invention uses mature commercial optical devices to implement an uplink continuous variable quantum key distribution access network method at room temperature. Compared with the prior art, the invention does not need to transmit local oscillator light, greatly relieves the load of multi-channel signals when the optical branching devices are coupled, improves the spectral efficiency of quantum signal light, and greatly reduces the mutual influence among the signals; meanwhile, local oscillation light does not need to be generated by a continuous variable quantum key distribution sending end, so that sending end equipment can be further simplified, and actual deployment of an uplink access network is facilitated; the local oscillator light does not need to be transmitted, so that an eavesdropper in a channel is prevented from attacking the local oscillator light; the local oscillator light is locally generated by a continuous variable quantum key distribution receiving end, so that the power of the local oscillator light is ensured, and the detection of the quantum signal light is facilitated. The feasibility of the construction of the continuous variable quantum access network is greatly improved.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the protective enclosure of the present invention should be defined by the appended claims.
Claims (5)
1. An access network method for uplink continuous variable quantum key distribution is characterized in that: the method comprises the following steps:
step 1: n continuous variable quantum key distribution transmitting ends with the same wavelength prepare signal light, wherein the signal light comprises quantum signal light and phase reference light;
the step 1 comprises the following steps:
step 1 a: a continuous variable quantum key distribution sending end prepares a pulse signal by matching a laser or a laser with an intensity modulator;
step 1 b: pulse signals pass through a modulation module, wherein most of the pulse signals are modulated into quantum signal light, and the rest of the pulse signals are modulated into phase reference light;
step 1 c: the signal light passes through an attenuator to enable the quantum signal light to be attenuated to a proper level;
step 2: the n continuous variable quantum key distribution transmitting ends transmit the prepared signal light to corresponding delay lines, and then the signal light is coupled into 1 path of signal light through an optical splitter; the signal light is then sent to a continuous variable quantum key distribution receiving end;
and step 3: the continuous variable quantum key distribution receiving end generates local oscillation light by utilizing a local laser or a local laser matched with an intensity modulator;
and 4, step 4: the local oscillator light and the signal light enter a heterodyne detection module together for detection, and the heterodyne detection module comprises 2 homodyne detectors for respectively detecting 2 regular components of the signal light;
and 5: the phase difference is compensated by the phase modulator according to the phase change of the phase reference light.
2. The method according to claim 1, wherein in step 2, the time when the n signal lights reach the optical splitter is respectively calibrated through the delay line before passing through the optical splitter, so that the n signal lights enter the optical splitter without overlapping.
3. The method according to claim 1, wherein in step 3, the local oscillator light may be continuous light or pulsed light.
4. The method for accessing the uplink continuous variable quantum key distribution network according to claim 1, wherein in step 4, quantum signal light and local oscillator light pulses enter a heterodyne detection module for detection, and x component data and p component data are obtained simultaneously; the phase reference light and the local oscillator light pulse are detected by the heterodyne detection module, and the phase change of the phase reference light is calculated according to the detection result.
5. A method for accessing an uplink continuous variable quantum key distribution network is characterized in that a local laser of a continuous variable quantum key distribution receiving end simultaneously provides local oscillator light for signal light of n continuous variable quantum key distribution transmitting ends, and quantum key distribution is achieved.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117914411A (en) * | 2024-03-19 | 2024-04-19 | 济南量子技术研究院 | Phase feedback method for TF-QKD system |
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| WO2018162042A1 (en) * | 2017-03-07 | 2018-09-13 | Huawei Technologies Co., Ltd. | Self-referenced continous-variable quantum key distribution devices, methods and systems |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117914411A (en) * | 2024-03-19 | 2024-04-19 | 济南量子技术研究院 | Phase feedback method for TF-QKD system |
| CN117914411B (en) * | 2024-03-19 | 2024-06-04 | 济南量子技术研究院 | Phase feedback method for TF-QKD system |
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Application publication date: 20201016 |