CN105049202A - Method and device for dynamically adjusting defector drift in quantum key distribution system - Google Patents
Method and device for dynamically adjusting defector drift in quantum key distribution system Download PDFInfo
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Abstract
The invention discloses a method for dynamically adjusting defector drift in a quantum key distribution system. The method comprises the following steps: reading the photon count and the systematic error rate of a single-photon detector in real time to dynamically calculate detection efficiency, in order to monitor the change of the detection efficiency of the single-photon detector in the working process in real time; performing ex-factory parameter calibration on the single-photon detector, calibrating the detection efficiency, and at the set detection efficiency, recording dark count Tc at corresponding detection efficiency without light input and a detection photon count draw value Tf in case of quantum light input; and if the fluctuation of the Tf exceeds a set threshold delta T, starting a self-calibration process. The invention also discloses a device for dynamically adjusting defector drift in the quantum key distribution system. According to the method and the device for dynamically adjusting defector drift in the quantum key distribution system, the defector drift is dynamically adjusted to enable the detector to return a stable operating state, and therefore, the influence of environmental change on the system is overcome.
Description
Technical field
The present invention relates to the method for adjustment of the detector drift in a kind of quantum key dispatching system, particularly relate to method and the device of the dynamic conditioning detector drift in a kind of quantum key dispatching system.
Background technology
Quantum key dispatching system-also claims detector operation principle block diagram in QKD-as shown in Figure 1, time detector does factory-designed, demarcate dark counting and VDC and the VTH value under each detection efficient of detection APD pipe in advance, these values are cured on memory.Owing to detecting in the course of the work, along with the change of ambient temperature, the efficiency of detector can be drifted about, if environmental change amplitude is very large, detection efficient can offset a lot.Although we can carry out temperature control to detector, temperature controlled scope and effect may not meet the demands.The way of conventional detectors is that detection efficient is demarcated parameter when dispatching from the factory, and no longer revises in later stage work process, if operational environment differs greatly with environment when demarcating, these parameters of demarcating in advance will be not suitable for.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, the method providing the dynamic conditioning detector in a kind of quantum key dispatching system to drift about and device, the value of demarcating time detector dispatches from the factory by this method is worth use by default, the change of Real-Time Monitoring detection efficient, system is had an impact when environment acute variation, when causing detection efficient to change, dynamic conditioning is done to detector, by the value after adjustment as new quiescent potential value, this dynamic conditioning detector drift, detector is made to get back to the state of steady operation, overcome environmental change to impact system.
For solving the problems of the technologies described above, the technical scheme that the present invention takes is: the dynamic conditioning detector bleach-out process in quantum key dispatching system, is characterized in that:
Real-time reading single-photon detector photometry number and error rate of system dynamic calculation detection efficient, with the change of Real-Time Monitoring single-photon detector detection efficient in the course of the work;
Before dispatching from the factory, carry out single-photon detector parameter calibration, demarcate detection efficient, under the detection efficient of setting, secret mark number Tc when recording unglazed input under corresponding detection efficient and the detection photometry number draw value Tf under quantum light input condition;
If Tf fluctuation has exceeded setting threshold Δ T, then start self-calibration flow process; The flow process of described self-calibration comprises the following steps:
(1) stop QKD running, close the quantum light laser of QKD transmitting terminal, make detector be in unglazed input;
(2) set threshold voltage VTH is maximum, then the numerical value of threshold V T H is progressively reduced, the threshold voltage value VTHi of correspondence and secret mark numerical value Ti is recorded, until threshold voltage value VTHi is reduced to minimum, then from the secret mark numerical value Ti of record, find the secret mark numerical value Ti closest to secret mark number Tc value, threshold V T H is set as the threshold voltage value VTHi corresponding with this secret mark numerical value Ti;
(3) the quantum light laser of QKD transmitting terminal is opened;
(4) setting bias voltage VDC is maximum, then progressively reduces the bias voltage numerical value VDCi of bias voltage VDC, records, the bias voltage numerical value VDCi of correspondence and photometry numerical value Ti until bias voltage VDC is reduced to minimum; After from the photometry number Ti value of record, find photometry numerical value Ti closest to photometry number average T f value; If | Tf-Ti|< Δ T, is set as the VDCi value corresponding with this Ti by VDC; Numerical value due to VDC is crossed conference and is punctured avalanche photodide APD, and the maximum of described bias voltage VDC is no more than presetting value, and described presetting value refers to the bias voltage maximum that avalanche optoelectronic two pole APD itself is intrinsic;
(5) if | Tf-Ti|> Δ T, progressively adjusting threshold voltage VTH up and down, again repeat the 4th step in flow process, if still had | Tf-Ti|> Δ T, and threshold V T H be reduced to downwards minimum and upwards increased maximum, then abandon self-regulation, QKD system provides and cannot self-regulation point out simultaneously;
(6), after finding the threshold V T H satisfied condition and bias voltage VDC, using the value of the value of threshold V T H that satisfies condition and bias voltage VDC as operational voltage value, start QKD, enter normal operating conditions.
For realizing above-mentioned technical purpose, the another kind of technical scheme that the present invention takes is: the dynamic conditioning detector shift in quantum key dispatching system, is characterized in that:
Comprise efficiency detecting module, described efficiency detecting module is used for reading single-photon detector photometry number and error rate of system dynamic calculation detection efficient in real time, with the change of Real-Time Monitoring single-photon detector detection efficient in the course of the work;
Also comprise secret mark number and detection photometry number draw value record device; Described secret mark number and detection photometry number draw value record device are used for carrying out single-photon detector parameter calibration before dispatching from the factory, demarcate detection efficient, under presetting detection efficient, secret mark number Tc when recording unglazed input under corresponding detection efficient and the detection photometry number draw value Tf under quantum light input condition;
Also comprise for the drift of dynamic conditioning detector, make detector get back to the self-calibration module of the state of steady operation.
Further, when detection photometry number draw value Tf fluctuation has exceeded setting threshold Δ T, self-calibration module starts.
Further, described self-calibration module stops QKD running, and closes the quantum light laser of QKD transmitting terminal, makes detector be in unglazed input; Set threshold voltage VTH is maximum, then the numerical value of threshold V T H is progressively reduced, the threshold voltage value VTHi of correspondence and secret mark numerical value Ti is recorded, until threshold voltage value VTHi is reduced to minimum, then from the secret mark numerical value Ti of record, find the secret mark numerical value Ti closest to secret mark number Tc value, threshold V T H is set as the threshold voltage value VTHi corresponding with this secret mark numerical value Ti; Open the quantum light laser of QKD transmitting terminal; Setting bias voltage VDC is maximum, then progressively reduces the bias voltage numerical value VDCi of bias voltage VDC, records, the bias voltage numerical value VDCi of correspondence and photometry numerical value Ti until bias voltage VDC is reduced to minimum; After from the photometry number Ti value of record, find photometry numerical value Ti closest to photometry number average T f value; If | Tf-Ti|< Δ T, is set as the VDCi value corresponding with this Ti by VDC; Numerical value due to VDC is crossed conference and is punctured avalanche photodide APD, and the maximum of described bias voltage VDC is no more than presetting value, and described presetting value refers to the bias voltage maximum that avalanche optoelectronic two pole APD itself is intrinsic; If | Tf-Ti|> Δ T, progressively adjusting threshold voltage VTH up and down, again repeat the 4th step in flow process, if still had | Tf-Ti|> Δ T, and threshold V T H be reduced to downwards minimum and upwards increased maximum, then abandon self-regulation, QKD system provides and cannot self-regulation point out simultaneously; After finding the threshold V T H and bias voltage VDC satisfied condition, using the value of the value of threshold V T H that satisfies condition and bias voltage VDC as operational voltage value, start QKD, enter normal operating conditions.
Real-Time Monitoring detector efficiency change of the present invention; After detection efficient change, demarcate secret mark numerical value Tc according to pre-, and photometry numerical value Tf, rescan operating voltage; With the secret mark numerical value Tc demarcated in advance and photometry numerical value Tf for reference data, scan new VDC and VTH up and down; Self-protection system mechanism, does not allow the numerical value of VDC more than the voltage breakdown value of APD; After self-calibration terminates, system enters operating state automatically.The invention solves when environment acute variation has an impact to system time, if detection efficient changes, dynamic conditioning is done to detector, by the value after adjustment as working point numerical value, dynamic conditioning detector drifts about, make detector get back to the state of steady operation, overcome environmental change and system is impacted.
Accompanying drawing explanation
Fig. 1 is the operation principle block diagram of detector in prior art.
Fig. 2 is self-calibration schematic flow sheet of the present invention.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described further.
Embodiment
Embodiment 1
See Fig. 2, the dynamic conditioning detector bleach-out process in this quantum key dispatching system, comprises the following steps:
Real-time reading single-photon detector photometry number and error rate of system dynamic calculation detection efficient, with the change of Real-Time Monitoring single-photon detector detection efficient in the course of the work; Before dispatching from the factory, carry out single-photon detector parameter calibration, demarcate detection efficient, under the detection efficient of setting, secret mark number Tc when recording unglazed input under corresponding detection efficient and the detection photometry number draw value Tf under quantum light input condition; If Tf fluctuation has exceeded setting threshold Δ T, then start self-calibration flow process; The flow process stating self-calibration comprises the following steps:
(1) stop QKD running, close the quantum light laser of QKD transmitting terminal, make detector be in unglazed input;
(2) set threshold voltage VTH is maximum, then the numerical value of threshold V T H is progressively reduced, the threshold voltage value VTHi of correspondence and secret mark numerical value Ti is recorded, until threshold voltage value VTHi is reduced to minimum, then from the secret mark numerical value Ti of record, find the secret mark numerical value Ti closest to secret mark number Tc value, threshold V T H is set as the threshold voltage value VTHi corresponding with this secret mark numerical value Ti;
(3) the quantum light laser of QKD transmitting terminal is opened;
(4) setting bias voltage VDC is maximum, then progressively reduces the bias voltage numerical value VDCi of bias voltage VDC, records, the bias voltage numerical value VDCi of correspondence and photometry numerical value Ti until bias voltage VDC is reduced to minimum; After from the photometry number Ti value of record, find photometry numerical value Ti closest to photometry number average T f value; If | Tf-Ti|< Δ T, is set as the VDCi value corresponding with this Ti by VDC; Numerical value due to VDC is crossed conference and is punctured avalanche photodide APD, and the maximum of described bias voltage VDC is no more than presetting value, and described presetting value refers to the bias voltage maximum that avalanche optoelectronic two pole APD itself is intrinsic;
(5) if | Tf-Ti|> Δ T, progressively adjusting threshold voltage VTH up and down, again repeat the 4th step in flow process, if still had | Tf-Ti|> Δ T, and threshold V T H be reduced to downwards minimum and upwards increased maximum, then abandon self-regulation, QKD system provides and cannot self-regulation point out simultaneously;
(6), after finding the threshold V T H satisfied condition and bias voltage VDC, using the value of the value of threshold V T H that satisfies condition and bias voltage VDC as operational voltage value, start QKD, enter normal operating conditions.
Embodiment 2
See Fig. 2, dynamic conditioning detector shift in this quantum key dispatching system, comprise efficiency detecting module, described efficiency detecting module is used for reading single-photon detector photometry number and error rate of system dynamic calculation detection efficient in real time, with the change of Real-Time Monitoring single-photon detector detection efficient in the course of the work; Also comprise secret mark number and detection photometry number draw value record device; Described secret mark number and detection photometry number draw value record device are used for carrying out single-photon detector parameter calibration before dispatching from the factory, demarcate detection efficient, under presetting detection efficient, secret mark number Tc when recording unglazed input under corresponding detection efficient and the detection photometry number draw value Tf under quantum light input condition; Also comprise for the drift of dynamic conditioning detector, make detector get back to the self-calibration module of the state of steady operation.Preferably, when detection photometry number draw value Tf fluctuation has exceeded setting threshold Δ T, self-calibration module starts.Described self-calibration module stops QKD running, and closes the quantum light laser of QKD transmitting terminal, makes detector be in unglazed input; Set threshold voltage VTH is maximum, then the numerical value of threshold V T H is progressively reduced, the threshold voltage value VTHi of correspondence and secret mark numerical value Ti is recorded, until threshold voltage value VTHi is reduced to minimum, then from the secret mark numerical value Ti of record, find the secret mark numerical value Ti closest to secret mark number Tc value, threshold V T H is set as the threshold voltage value VTHi corresponding with this secret mark numerical value Ti; Open the quantum light laser of QKD transmitting terminal; Setting bias voltage VDC is maximum, then progressively reduces the bias voltage numerical value VDCi of bias voltage VDC, records, the bias voltage numerical value VDCi of correspondence and photometry numerical value Ti until bias voltage VDC is reduced to minimum; After from the photometry number Ti value of record, find photometry numerical value Ti closest to photometry number average T f value; If | Tf-Ti|< Δ T, is set as the VDCi value corresponding with this Ti by VDC; Numerical value due to VDC is crossed conference and is punctured avalanche photodide APD, and the maximum of described bias voltage VDC is no more than presetting value, and described presetting value refers to the bias voltage maximum that avalanche optoelectronic two pole APD itself is intrinsic; If | Tf-Ti|> Δ T, progressively adjusting threshold voltage VTH up and down, again repeat the 4th step in flow process, if still had | Tf-Ti|> Δ T, and threshold V T H be reduced to downwards minimum and upwards increased maximum, then abandon self-regulation, QKD system provides and cannot self-regulation point out simultaneously; After finding the threshold V T H and bias voltage VDC satisfied condition, using the value of the value of threshold V T H that satisfies condition and bias voltage VDC as operational voltage value, start QKD, enter normal operating conditions.
Claims (4)
1. the dynamic conditioning detector bleach-out process in quantum key dispatching system, is characterized in that:
Real-time reading single-photon detector photometry number and error rate of system dynamic calculation detection efficient, with the change of Real-Time Monitoring single-photon detector detection efficient in the course of the work;
Before dispatching from the factory, carry out single-photon detector parameter calibration, demarcate detection efficient, under presetting detection efficient, secret mark number Tc when recording unglazed input under corresponding detection efficient and the detection photometry number draw value Tf under quantum light input condition;
If detection photometry number draw value Tf fluctuation has exceeded setting threshold Δ T, then start self-calibration flow process; The flow process stating self-calibration comprises the following steps:
(1) stop QKD running, close the quantum light laser of QKD transmitting terminal, make detector be in unglazed input;
(2) set threshold voltage VTH is maximum, then the numerical value of threshold V T H is progressively reduced, the threshold voltage value VTHi of correspondence and secret mark numerical value Ti is recorded, until threshold voltage value VTHi is reduced to minimum, then from the secret mark numerical value Ti of record, find the secret mark numerical value Ti closest to secret mark number Tc value, threshold V T H is set as the threshold voltage value VTHi corresponding with this secret mark numerical value Ti;
(3) the quantum light laser of QKD transmitting terminal is opened;
(4) setting bias voltage VDC is maximum, then progressively reduces the bias voltage numerical value VDCi of bias voltage VDC, records, the bias voltage numerical value VDCi of correspondence and photometry numerical value Ti until bias voltage VDC is reduced to minimum; After from the photometry number Ti value of record, find photometry numerical value Ti closest to photometry number average T f value; If | Tf-Ti|< Δ T, is set as the VDCi value corresponding with this Ti by VDC; Numerical value due to VDC is crossed conference and is punctured avalanche photodide APD, and the maximum of described bias voltage VDC is no more than presetting value, and described presetting value refers to the bias voltage maximum that avalanche optoelectronic two pole APD itself is intrinsic;
(5) if | Tf-Ti|> Δ T, progressively adjusting threshold voltage VTH up and down, again repeat the 4th step in flow process, if still had | Tf-Ti|> Δ T, and threshold V T H be reduced to downwards minimum and upwards increased maximum, then abandon self-regulation, QKD system provides and cannot self-regulation point out simultaneously;
(6), after finding the threshold V T H satisfied condition and bias voltage VDC, using the value of the value of threshold V T H that satisfies condition and bias voltage VDC as operational voltage value, start QKD, enter normal operating conditions.
2. the dynamic conditioning detector shift in quantum key dispatching system, is characterized in that:
Comprise efficiency detecting module, described efficiency detecting module is used for reading single-photon detector photometry number and error rate of system dynamic calculation detection efficient in real time, with the change of Real-Time Monitoring single-photon detector detection efficient in the course of the work;
Also comprise secret mark number and detection photometry number draw value record device; Described secret mark number and detection photometry number draw value record device are used for carrying out single-photon detector parameter calibration before dispatching from the factory, demarcate detection efficient, under presetting detection efficient, secret mark number Tc when recording unglazed input under corresponding detection efficient and the detection photometry number draw value Tf under quantum light input condition;
Also comprise for the drift of dynamic conditioning detector, make detector get back to the self-calibration module of the state of steady operation.
3. the dynamic conditioning detector shift in quantum key dispatching system according to claim 2, is characterized in that: when detection photometry number draw value Tf fluctuation has exceeded setting threshold Δ T, self-calibration module starts.
4. the dynamic conditioning detector shift in quantum key dispatching system according to claim 3, is characterized in that:
Described self-calibration module stops QKD running, and closes the quantum light laser of QKD transmitting terminal, makes detector be in unglazed input; Set threshold voltage VTH is maximum, then the numerical value of threshold V T H is progressively reduced, the threshold voltage value VTHi of correspondence and secret mark numerical value Ti is recorded, until threshold voltage value VTHi is reduced to minimum, then from the secret mark numerical value Ti of record, find the secret mark numerical value Ti closest to secret mark number Tc value, threshold V T H is set as the threshold voltage value VTHi corresponding with this secret mark numerical value Ti; Open the quantum light laser of QKD transmitting terminal; Setting bias voltage VDC is maximum, then progressively reduces the bias voltage numerical value VDCi of bias voltage VDC, records, the bias voltage numerical value VDCi of correspondence and photometry numerical value Ti until bias voltage VDC is reduced to minimum; After from the photometry number Ti value of record, find photometry numerical value Ti closest to photometry number average T f value; If | Tf-Ti|< Δ T, is set as the VDCi value corresponding with this Ti by VDC; Numerical value due to VDC is crossed conference and is punctured avalanche photodide APD, and the maximum of described bias voltage VDC is no more than presetting value, and described presetting value refers to the bias voltage maximum that avalanche optoelectronic two pole APD itself is intrinsic; If | Tf-Ti|> Δ T, progressively adjusting threshold voltage VTH up and down, again repeat the 4th step in flow process, if still had | Tf-Ti|> Δ T, and threshold V T H be reduced to downwards minimum and upwards increased maximum, then abandon self-regulation, QKD system provides and cannot self-regulation point out simultaneously; After finding the threshold V T H and bias voltage VDC satisfied condition, using the value of the value of threshold V T H that satisfies condition and bias voltage VDC as operational voltage value, start QKD, enter normal operating conditions.
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