CN104199017A - Real-time range measurement system based on quantum entangled light and implementation method thereof - Google Patents
Real-time range measurement system based on quantum entangled light and implementation method thereof Download PDFInfo
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- CN104199017A CN104199017A CN201410381646.9A CN201410381646A CN104199017A CN 104199017 A CN104199017 A CN 104199017A CN 201410381646 A CN201410381646 A CN 201410381646A CN 104199017 A CN104199017 A CN 104199017A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
- G01S11/12—Systems for determining distance or velocity not using reflection or reradiation using electromagnetic waves other than radio waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
- G01S17/10—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves
- G01S17/14—Systems determining position data of a target for measuring distance only using transmission of interrupted, pulse-modulated waves wherein a voltage or current pulse is initiated and terminated in accordance with the pulse transmission and echo reception respectively, e.g. using counters
Abstract
The invention provides a real-time range measurement system based on quantum entangled light. The real-time range measurement system comprises a light source module and a circuit module, wherein the light source module is used for generating signal light and reference light; the circuit module is used for calculating a distance to be measured based on the input signal light and reference light. The light source module comprises a semiconductor laser, a filter, a one-quarter wave plate, a half-wave plate, a polarizing film, a periodically polarized crystal and a polarization beam splitter, wherein the semiconductor laser is used for generating pump light which is orderly incident into the one-quarter wave plate, the half-wave plate, the polarizing film and the periodically polarized crystal and then filtered out by the filter, and meanwhile, H polarized light and V polarized light are generated; the polarization beam splitter is used for separating out the signal light and the reference light from the H polarized light and the V polarized light. The invention also provides a corresponding method. The anti-jamming characteristic of the real-time range measurement system based on quantum entangled light is improved by use of a second-order association algorithm; besides, the real-time range measurement system is capable of realizing real-time data processing by use of FPGA (Field Programmable Gate Array), and therefore, data acquisition and data processing can be carried out simultaneously.
Description
Technical field
The present invention relates to quantum navigation, particularly, relate to a kind of real time distance system and its implementation based on quantum entanglement light.
Background technology
Along with the development of human civilization, also arise at the historic moment for the demand of ranging technology.Nowadays, ranging technology has been deep into human lives's every field, more has vital effect in the field such as political, economic, military.
Traditional laser ranging technique mainly utilizes the characteristics such as laser direction is strong, brightness is high to find range.Can be divided into continuous wave laser and pulsed laser according to the working method of laser instrument.This distance measuring method mainly swashs reflection of light by reception, thereby calculates the round time, finally extrapolates distance.But this distance measuring method can be subject to the restriction of the shot noise limit, cannot break through this limit, and quantum entanglement is utilized its associate feature, can break through this limit, therefore also become up-to-date research direction.
Quantum entanglement is multiple particles interactive phenomenons in a system, is proposed in the time querying quantum-mechanical completeness by Schrodinger and einstein etc.Along with the development of quantum theory, quantum entanglement is all applied in every field.Uncertainty principle in quantum mechanics has determined that the measurement based on quantum theory can be subject to the restriction of Heisenberg's limit, but the shot noise limit that also can reach considerably beyond traditional measurement.
It is to study at present the most deep a kind of quantum entanglement source technology that two-photon tangles source, mainly utilizes the nonlinear effect of crystal, and under the Spontaneous Parametric of the quasi-phase-matching crystals such as the crystal such as BBO and KDP or PPLN and PPKTP based on second order nonlinear effect, standard is changed.The photon being produced by crystal, to after the transmission on signal road and idle road, uses single-photon detector to survey, and obtains photon poor right time of arrival, finally by calculating distance by coincidence counting algorithm.
Summary of the invention
For defect of the prior art, the object of this invention is to provide a kind of real time distance system and method thereof based on quantum entanglement light.
The real time distance system based on quantum entanglement light providing according to an aspect of the present invention, comprises light source module and circuit module;
Wherein, described light source module is for generation of flashlight and reference light; Described circuit module is for calculating testing distance according to the flashlight of input and reference light.
Preferably, described light source module comprises semiconductor laser, filter plate, four point of one wave plate, 1/2nd wave plates, polaroid, periodic polarized crystal and polarization beam apparatus;
Wherein, semiconductor laser is for generation of pump light, pump light successively after four point of one wave plate of incident, 1/2nd wave plates, polaroid, periodic polarized crystal through filter plate filtering pump light and produce H polarized light and V polarized light;
Polarization beam apparatus is for isolating flashlight and reference light by H polarized light and V polarized light.
Preferably,, also comprise photon coupler, signal light path and reference path, described signal light path connects the optical fiber of unknown lengths, and described reference path connects the optical fiber of known length;
Described flashlight is inputted described signal light path by described photon coupler; Described reference light is inputted described reference path by described photon coupler.
Preferably,, circuit module comprises the first single photon detector, the second single photon detector, analog-to-digital conversion device and data processing module;
Wherein, the first single photon detector is for being converted into the first electric signal by the light signal of flashlight;
The second single photon detector is for being converted into the second electric signal with reference to the light signal of light;
Analog to digital converter is for being converted to digital signal by the first electric signal and the second electric signal by simulating signal;
Data processing module will be for carrying out photon judgement time of arrival, coincidence counting and computation and measurement distance according to described digital signal.
Preferably,, also comprise the first attenuator and the second attenuator, described the first attenuator described the first electric signal that is used for decaying; Described the second attenuator described the second electric signal that is used for decaying.
Preferably,, described data processing module adopts FPGA; Described analog-to-digital conversion device adopts high-speed digital-analog converter, and sampling rate is 2.5G, and quantized interval is 0.5mV.
The implementation method of the real time distance system based on quantum entanglement light providing according to another aspect of the present invention,, comprise the steps:
Step 1: signal light path and reference path are carried out respectively inputting data processing module after analog to digital conversion;
Step 2: respectively the sampled value of signal light path and reference path is carried out to photon and arrive threshold determination and calculate photon time of arrival;
Step 3: by coincidence counting obtain photon to and record poor and photon logarithm photon right time of arrival;
Step 4: in the time that timer arrives setting value, obtain average time of arrival poor, and then obtain the mistiming of signal light path and reference path;
Step 5: according to the mistiming computation and measurement distance of group index and signal light path and reference path.
Preferably, the calculating of photon time of arrival comprises the steps:
Step 1: set photon according to the output of single photon counter and arrive decision threshold T1 and photon due in threshold value T2,
Step 2: when continuous two signals that collect exceed T1, confirm as photon and arrive;
Step 3: the blank signal collecting according to former and later two is extrapolated the moment of single photon counter output arrival T2, the moment that photon arrives.
According to the flow chart of data processing based on FPGA provided by the invention, compared with prior art, the present invention has following beneficial effect:
1, the present invention adopts double velocity correlation algorithm to improve noiseproof feature;
2, the present invention uses FPGA to carry out real-time data processing, and data acquisition and data processing are carried out simultaneously;
3, the present invention is simple in structure, is easy to assembling.
Brief description of the drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is the structural representation block diagram of the real time distance system based on quantum entanglement light in the present invention;
Fig. 2 is the process flow diagram of the implementation method of the real time distance system based on quantum entanglement light in the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art further to understand the present invention, but not limit in any form the present invention.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
As shown in Figure 1, in the present embodiment, the real time distance system based on quantum entanglement light provided by the invention comprises light source portion and circuit part, and wherein, described light source module is for generation of flashlight and reference light; Described circuit module is for calculating testing distance according to the flashlight of input and reference light.
Light source module comprises semiconductor laser, filter plate, four point of one wave plate, 1/2nd wave plates, polaroid, periodic polarized crystal (PPKTP crystal), polarization beam apparatus and photon coupler;
The pump light that semiconductor laser is 405nm for generation of wavelength, incident periodic polarized crystal after occurred level polarization after polaroid, then wave plate filtering pump light after filtration, produce the light of H polarization and V polarization, finally isolating wavelength by polarization beam apparatus is the flashlight of 810nm and the reference light of 810nm.
The pump light that laser instrument sends passes through quarter-wave plate and 1/2nd wave plates successively, and the polarization direction of pump light is adjusted into horizontal polarization, then obtains the laser of horizontal polarization by polaroid.Signal road and reference arm light signal after transmission, need to be coupled to light signal in single-photon detector by photon coupler respectively in optical fiber, then carry out coincidence measurement.
Circuit part comprises the first single photon detector, the second single photon detector, analog-to-digital conversion device and data processing module.Wherein, the first single photon counter is for being converted into the first electric signal by the light signal of flashlight; The second single photon detector is for being converted into the second electric signal with reference to the light signal of light; Analog to digital converter is for being converted to digital signal by the first electric signal and the second electric signal by simulating signal; Data processing module will be for carrying out photon judgement time of arrival, coincidence counting and computation and measurement distance according to described digital signal.
Described data processing module adopts FPGA; Described analog-to-digital conversion device adopts high-speed digital-analog converter, and sampling rate is 2.5G, and quantized interval is 0.5mV.
Real time distance system based on quantum entanglement light provided by the invention also comprises signal light path and reference path, and described signal light path connects the optical fiber of unknown lengths, and described reference path connects the optical fiber of known length; Described flashlight is inputted described signal light path; Described reference light is inputted described reference path.
As shown in Figure 2, in the present embodiment, the implementation method of quantum entanglement real time distance system provided by the invention comprises the steps:
Step 1: use digital-to-analogue converter to carry out respectively analog to digital conversion to signal light path and reference path, and the result of conversion is input in FPGA;
Step 2:FPGA carries out to the sampled value of signal light path and reference path that photon arrives threshold determination respectively and by calculating photon time of arrival;
Step 3: by coincidence counting obtain photon to and record poor and photon logarithm photon right time of arrival;
Step 4: in the time that timer arrives one second, obtain average time of arrival poor, and then obtain the mistiming of signal light path and reference path;
Step 5: according to the mistiming computation and measurement distance of group index and signal light path and reference path.
Wherein, the step that step 2 is calculated photon time of arrival is as follows: first set a photon according to the output of the single photon detector using and arrive decision threshold T1 and photon due in threshold value T2, when continuous two signals that collect as FPGA exceed this threshold value T1, think and have photon to arrive; Because the rising edge of the output pulse of single photon counter is similar to straight line, therefore the signal that is spaced apart 400ps (sampling rate is 2.5GHz) collecting according to former and later two is extrapolated single photon counter output and is arrived the moment of T2, and this is thought to the moment that photon arrives.Double velocity correlation algorithm is in the time that signal Lu Youyi photon arrives, check that whether reference arm has photon to arrive in time range T (being coincidence counting gate-width), if had, thinks that this is a photon pair, meeting number increases by one, records the mistiming t that two photons arrive simultaneously.Calculate the mean value of the right mistiming t of all photons every 1 second, extrapolate thus corresponding distance.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (8)
1. the real time distance system based on quantum entanglement light, is characterized in that, comprises light source module and circuit module;
Wherein, described light source module is for generation of flashlight and reference light; Described circuit module is for calculating testing distance according to the flashlight of input and reference light.
2. the real time distance system based on quantum entanglement light according to claim 1, it is characterized in that, described light source module comprises semiconductor laser, filter plate, four point of one wave plate, 1/2nd wave plates, polaroid, periodic polarized crystal and polarization beam apparatus;
Wherein, semiconductor laser is for generation of pump light, pump light successively after four point of one wave plate of incident, 1/2nd wave plates, polaroid, periodic polarized crystal through filter plate filtering pump light and produce H polarized light and V polarized light;
Polarization beam apparatus is for isolating flashlight and reference light by H polarized light and V polarized light.
3. the real time distance system based on quantum entanglement light according to claim 2, it is characterized in that, also comprise photon coupler, signal light path and reference path, described signal light path connects the optical fiber of unknown lengths, and described reference path connects the optical fiber of known length;
Described flashlight is inputted described signal light path by described photon coupler; Described reference light is inputted described reference path by described photon coupler.
4. the real time distance system based on quantum entanglement light according to claim 3, is characterized in that, circuit module comprises the first single photon detector, the second single photon detector, analog-to-digital conversion device and data processing module;
Wherein, the first single photon detector is for being converted into the first electric signal by the light signal of flashlight;
The second single photon detector is for being converted into the second electric signal with reference to the light signal of light;
Analog to digital converter is for being converted to digital signal by the first electric signal and the second electric signal by simulating signal;
Data processing module will be for carrying out photon judgement time of arrival, coincidence counting and computation and measurement distance according to described digital signal.
5. the real time distance system based on quantum entanglement light according to claim 4, is characterized in that, also comprises the first attenuator and the second attenuator, described the first attenuator described the first electric signal that is used for decaying; Described the second attenuator described the second electric signal that is used for decaying.
6. the real time distance system based on quantum entanglement light according to claim 4, is characterized in that, described data processing module adopts FPGA; Described analog-to-digital conversion device adopts high-speed digital-analog converter, and sampling rate is 2.5G, and quantized interval is 0.5mV.
7. an implementation method for the real time distance system based on quantum entanglement light described in claim 1 to 6 any one, is characterized in that, comprises the steps:
Step 1: signal light path and reference path are carried out respectively inputting data processing module after analog to digital conversion;
Step 2: respectively the sampled value of signal light path and reference path is carried out to photon and arrive threshold determination and calculate photon time of arrival;
Step 3: by coincidence counting obtain photon to and record poor and photon logarithm photon right time of arrival;
Step 4: in the time that timer arrives setting value, obtain average time of arrival poor, and then obtain the mistiming of signal light path and reference path;
Step 5: according to the mistiming computation and measurement distance of group index and signal light path and reference path.
8. the implementation method of the real time distance system based on quantum entanglement light according to claim 7, is characterized in that, the calculating of photon time of arrival comprises the steps:
Step 1: set photon according to the output of single photon counter and arrive decision threshold T1 and photon due in threshold value T2,
Step 2: when continuous two signals that collect exceed T1, confirm as photon and arrive;
Step 3: the blank signal collecting according to former and later two is extrapolated the moment of single photon counter output arrival T2, the moment that photon arrives.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597467A (en) * | 2016-11-22 | 2017-04-26 | 北京航天控制仪器研究所 | HOM interference principle-based range finder |
| CN111198363A (en) * | 2018-11-16 | 2020-05-26 | 赫克斯冈技术中心 | Distance measuring device with high signal dynamics and reference optical path matched with same |
| CN111896096A (en) * | 2020-06-30 | 2020-11-06 | 太原理工大学 | Device for accurately measuring mechanical vibration by utilizing photon counter |
| CN112902766A (en) * | 2021-01-22 | 2021-06-04 | 中国科学院西安光学精密机械研究所 | Near-infrared quantum guide target detection system and method capable of resisting information decoy interference |
| CN113408734A (en) * | 2021-06-30 | 2021-09-17 | 武汉理工大学 | Optical adder based on quantum polarization entanglement |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050213107A1 (en) * | 2004-02-12 | 2005-09-29 | Kouichi Ichimura | Microscope using quantum-mechanically entangled photons |
| WO2007050284A2 (en) * | 2005-10-27 | 2007-05-03 | Magiq Technologies, Inc. | Narrow-band single-photon source and qkd system using same |
| CN101620273A (en) * | 2009-08-08 | 2010-01-06 | 桂林电子科技大学 | Method for detecting underwater object by relevance imaging |
| CN102501978A (en) * | 2011-11-02 | 2012-06-20 | 中国科学院西安光学精密机械研究所 | Method and system for realizing all-weather aircraft landing or carrier landing by quantum entangled-state light |
| CN103675801A (en) * | 2013-12-02 | 2014-03-26 | 上海交通大学 | Navigation and distance measurement system on basis of quantum entanglement light and method for implementing navigation and distance measurement system |
-
2014
- 2014-08-05 CN CN201410381646.9A patent/CN104199017B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050213107A1 (en) * | 2004-02-12 | 2005-09-29 | Kouichi Ichimura | Microscope using quantum-mechanically entangled photons |
| WO2007050284A2 (en) * | 2005-10-27 | 2007-05-03 | Magiq Technologies, Inc. | Narrow-band single-photon source and qkd system using same |
| CN101620273A (en) * | 2009-08-08 | 2010-01-06 | 桂林电子科技大学 | Method for detecting underwater object by relevance imaging |
| CN102501978A (en) * | 2011-11-02 | 2012-06-20 | 中国科学院西安光学精密机械研究所 | Method and system for realizing all-weather aircraft landing or carrier landing by quantum entangled-state light |
| CN103675801A (en) * | 2013-12-02 | 2014-03-26 | 上海交通大学 | Navigation and distance measurement system on basis of quantum entanglement light and method for implementing navigation and distance measurement system |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106597467A (en) * | 2016-11-22 | 2017-04-26 | 北京航天控制仪器研究所 | HOM interference principle-based range finder |
| CN106597467B (en) * | 2016-11-22 | 2019-05-24 | 北京航天控制仪器研究所 | A kind of rangefinder based on HOM principle of interference |
| CN111198363A (en) * | 2018-11-16 | 2020-05-26 | 赫克斯冈技术中心 | Distance measuring device with high signal dynamics and reference optical path matched with same |
| CN111896096A (en) * | 2020-06-30 | 2020-11-06 | 太原理工大学 | Device for accurately measuring mechanical vibration by utilizing photon counter |
| CN112902766A (en) * | 2021-01-22 | 2021-06-04 | 中国科学院西安光学精密机械研究所 | Near-infrared quantum guide target detection system and method capable of resisting information decoy interference |
| CN113408734A (en) * | 2021-06-30 | 2021-09-17 | 武汉理工大学 | Optical adder based on quantum polarization entanglement |
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