CN104967824A - Image transmission system based on quantum ghost image and singlemode fiber - Google Patents
Image transmission system based on quantum ghost image and singlemode fiber Download PDFInfo
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Abstract
The invention discloses an image transmission system based on a quantum ghost image and a singlemode fiber. According to the invention, due to small perturbation of a fiber channel on photon frequency, long-distance distribution is carried out on two photons with associated frequency in the fiber channel, and the fiber channel is used for long distance image transmission through association freedom conversion. The problem that singlemode fiber channel cannot be used for long distance image transmission, which is caused by the fact that the traditional quantum ghost image based on photon space momentum or space position correlation photons is difficultly transmitted in the singlemode fiber which only supports a single space mode, is solved. Quantum state is used, so that a quantum mechanics physical principle is used to ensure the safety of a quantum image.
Description
Technical field
The invention belongs to quantum information field, more specifically relate to a kind of image delivery system based on quantum ghost image and monomode fiber.
Background technology
Quantum information science technology utilizes quantum-mechanical general principle, can realize the function that conventional information technology is difficult to realize.The imaging that quantum ghost image utilizes Quantum Correlation between photon to realize object a kind ofly in quantum information field has the technology enriching physical principle and application potential.
In quantum ghost image, first utilization sub-light source produces and has space and tangle or two photons of associate feature.One of them photon irradiation object, and the detection of coverlet point probe.Another photon delivers to a single-photon detector array with certain space resolution capability separated with object.Because the space quantum between two photons tangles/associate feature, the position that the position of the photon arrival object of irradiating object and another photon arrive detector is associated together, thus measured by coincidence counting, can single-point detector and have spatial resolving power single-photon detector array meet in result of detection the picture recovering object.The novel part of quantum ghost image is, the detector of record irradiating object photon is that single-point detector does not have spatial discrimination, and do not had irradiating object by the photon with the single-photon detector array detection of certain space resolution capability, but can take the photograph object side not irradiating, the coincidence counting measurement of both utilizations obtains the picture of object.If using specific image as the object for imaging, namely the principle of quantum ghost image can be used for the transmission of image.
Current, Networks of Fiber Communications is laid widely and is utilized, and the optical communication technique by means of Networks of Fiber Communications has also developed very ripe.But, although the principle of quantum ghost image has the potentiality transmitted for quantum image, the tangling of space momentum/position relied on due to traditional quantum ghost image scheme can not keep in monomode fiber, this quantum ghost image principle by means of the realization of the long distance of monomode fiber circuit of extensively having laid, cannot which has limited the application of quantum ghost image principle on long range image tranmission techniques.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is the transmission of the long range image how realized based on quantum ghost image principle.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides the image delivery system based on quantum ghost image and monomode fiber, it is characterized in that, described system comprises:
Quantum light source, for generation of the first photon and second photon of frequency association;
Image sending module, is connected with described quantum light source by monomode fiber, receives described first photon that described quantum light source is launched; Described image sending module comprises the first spatial dispersion element and the first single-photon detector, and described first photon, through described first spatial dispersion element process, is transmitted into different directions according to the difference of frequency, irradiates object; Described first single-photon detector detects described first photon by reflections off objects or transmission, obtains the first detection time;
Image-receptive processing module, be connected with described quantum light source by monomode fiber, be connected with described image sending module by communication channel, receive described second photon of described quantum light source transmitting and described first detection time of described image sending module transmission; Described image-receptive processing module comprises second space dispersion element, single-photon detector array and processor; Described second photon, through the process of described second space dispersion element, is transmitted into different directions according to the difference of frequency, and is detected by a single-photon detector of corresponding position in described single-photon detector array, obtains the second detection time; Multiple described first detection time that described processor obtains according to coincidence measurement, multiple second detection time and measure described multiple second detection time described single-photon detector single-photon detector array in the positional information of corresponding multiple single-photon detectors, obtain the picture of object through according calculation.
Preferably, described image sending module also comprises optical circulator, optical fiber collimator and condenser lens;
Described first photon injects described optical fiber collimator through described optical circulator, injects described first spatial dispersion element after collimation process, and the first photon penetrated by described first spatial dispersion element is irradiated on object after described condenser lens; By described first photon of reflections off objects successively through described condenser lens, the first spatial dispersion element, optical fiber collimator and optical circulator, and inject described first single-photon detector by described optical circulator.
Preferably, described image sending module also comprises optical fiber collimator, condenser lens and optical fiber collecting device;
Described first photon injects described optical fiber collimator, injects described first spatial dispersion element after collimation process, and the first photon penetrated by described first spatial dispersion element is irradiated on object after described condenser lens; Described first photon of object transmission injects described first single-photon detector by after described optical fiber collecting device collection.
Preferably, described image-receptive processing module also comprises optical fiber collimator, and described second photon, after the process of described optical fiber collimator collimation, injects described second space dispersion compensation module.
Preferably, described quantum light source comprises pump light source and is encouraged by described pump light source and produce the nonlinear optical element of described first photon and the second photon.
Preferably, described nonlinear optical element is the crystal of transition effects or the non-linear optical waveguide of the generation three spontaneous four-wave mixing effects in rank under generation two-stage parametric.
Preferably, under described generation two-stage parametric, the crystal of transition effects is the nonlinear optical crystal of various non-centrosymmetry lattice structure, periodically poled lithium niobate crystal, periodically poled lithium niobate waveguide, GaAs and indium phosphide etc. have the semi-conducting material of non-centrosymmetry lattice structure.
The non-linear optical waveguide of the spontaneous four-wave mixing effect in described generation three rank is silica fiber, chalcogenide glass optical fiber, silicon waveguide or gallium nitride waveguide;
Described pump light source is pulse pump light source or continuous pump light source.
Preferably, described second space dispersion element is diffraction grating, balzed grating, prism or spatial light modulator;
Described first single-photon detector is the single-photon detector of single-photon detector based on avalanche diode or based superconductive nano wire;
Described single-photon detector array is silicon single-photon detector array, indium phosphorus/InGaAsP single-photon detector array, electron multiplying charge coupler or superconducting nano-wire single-photon detector array.
Preferably, described image-receptive processing module image-receptive delay process module is replaced;
Described image-receptive delay process module is connected with described quantum light source by monomode fiber, be connected with described image sending module by communication channel, receive described second photon of described quantum light source transmitting and described first detection time of described image sending module transmission; Described image-receptive delay process module comprises time dispersive element, the second single-photon detector and processor; Described second photon, through the process of described time dispersive element, injects described second single-photon detector after carrying out the time delay of different time according to the difference of frequency, and obtains described second detection time by described second single-photon detector detection; For the first detection time described in each, second detection time corresponding with it determined by described processor; The multiple delayed datas produced by described time dispersive element determined by described processor according to multiple described first detection time and corresponding multiple described second detection time, utilize described multiple delayed data, cross the picture that according calculation obtains object.
Preferably, described single-photon detector is the single-photon detector of single-photon detector based on avalanche diode or based superconductive nano wire;
Described time dispersive element is have the monomode fiber of group velocity dispersion, long-period gratings or diffraction grating pair.
(3) beneficial effect
The invention provides a kind of image delivery system based on quantum ghost image and monomode fiber, the feature that the present invention utilizes fiber channel little to photon frequency disturbance, in fiber channel, distance distribution is grown to the two-photon of frequency association, and realize utilizing the long distance of the image of fiber channel to transmit by the conversion of the association degree of freedom.Solve the quantum ghost image that tradition tangled/associated photon based on photon space momentum or locus to be difficult to transmit in the monomode fiber only supporting single spatial model, the problem that monomode fiber channel thus cannot be utilized to realize long range image transmit.In addition, owing to make use of quantum state, quantum mechanics physical principle thus can be utilized to guarantee the fail safe of quantum image.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the image delivery system based on quantum ghost image and monomode fiber of the present invention;
Fig. 2 is the structural representation of the image sending module of a preferred embodiment in the present invention;
Fig. 3 is the structural representation of the image sending module of another preferred embodiment in the present invention;
Fig. 4 is the structural representation of the image-receptive processing module of a preferred embodiment in the present invention;
Fig. 5 is the structural representation of the image-receptive delay process module of another preferred embodiment in the present invention;
Fig. 6 a is the image utilizing system of the present invention to carry out the original objects of quantum ghost image transmission;
Fig. 6 b is the middle measurement result schematic diagram utilizing system of the present invention to carry out the transmission of quantum ghost image;
Fig. 6 c utilizes system of the present invention to carry out quantum ghost image to transmit coincidence measurement and recover the image that obtains.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Following examples for illustration of the present invention, but can not be used for limiting the scope of the invention.
Fig. 1 is the structural representation of the image delivery system based on quantum ghost image and monomode fiber of the present invention, and described system comprises:
Quantum light source, for generation of the first photon and second photon of frequency association;
Image sending module, is connected with described quantum light source by monomode fiber, receives described first photon that described quantum light source is launched; Described image sending module comprises the first spatial dispersion element and the first single-photon detector, and described first photon, through described first spatial dispersion element process, is transmitted into different directions according to the difference of frequency, irradiates object; Described first single-photon detector detects described first photon by reflections off objects or transmission, obtains the first detection time;
Image-receptive processing module, be connected with described quantum light source by monomode fiber, be connected with described image sending module by communication channel, receive described second photon of described quantum light source transmitting and described first detection time of described image sending module transmission; Described image-receptive processing module comprises second space dispersion element, single-photon detector array and processor; Described second photon, through the process of described second space dispersion element, is transmitted into different directions according to the difference of frequency, and is detected by a single-photon detector of corresponding position in described single-photon detector array, obtains the second detection time; Described processor, according to multiple described first detection time, multiple second detection time and the positional information measuring multiple single-photon detectors corresponding in the described single-photon detector single-photon detector array of described multiple second detection time, obtains the picture of object through according calculation.Described processor determines corresponding described second detection time according to described first detection time, the positional information corresponding according to described second detection time, determine the frequency of the second photon, thus the frequency of the first photon can be obtained, thus determine that the first photon irradiation is to the position on object.
Further, described image sending module also comprises optical circulator, optical fiber collimator and condenser lens;
Described first photon injects described optical fiber collimator through described optical circulator, injects described first spatial dispersion element after collimation process, and the first photon penetrated by described first spatial dispersion element is irradiated on object after described condenser lens; By described first photon of reflections off objects successively through described condenser lens, the first spatial dispersion element, optical fiber collimator and optical circulator, and inject described first single-photon detector by described optical circulator.
Further, described image sending module also comprises optical fiber collimator, condenser lens and optical fiber collecting device;
Described first photon injects described optical fiber collimator, injects described first spatial dispersion element after collimation process, and the first photon penetrated by described first spatial dispersion element is irradiated on object after described condenser lens; Described first photon of object transmission injects described first single-photon detector by after described optical fiber collecting device collection.
Further, described image-receptive processing module also comprises optical fiber collimator, and described second photon, after the process of described optical fiber collimator collimation, injects described second space dispersion compensation module.
Further, described quantum light source comprises pump light source and is encouraged by described pump light source and produce the nonlinear optical element of described first photon and the second photon.
Further, described nonlinear optical element is the crystal of transition effects or the non-linear optical waveguide of the generation three spontaneous four-wave mixing effects in rank under generation two-stage parametric.
Further, under described generation two-stage parametric, the crystal of transition effects is the nonlinear optical crystal of various non-centrosymmetry lattice structure, periodically poled lithium niobate crystal, periodically poled lithium niobate waveguide, GaAs and indium phosphide etc. have the semi-conducting material of non-centrosymmetry lattice structure.
The non-linear optical waveguide of the spontaneous four-wave mixing effect in described generation three rank is silica fiber, chalcogenide glass optical fiber, silicon waveguide or gallium nitride waveguide;
Described pump light source is pulse pump light source or continuous pump light source.
Further, described second space dispersion element is diffraction grating, balzed grating, prism or spatial light modulator;
Described first single-photon detector is the single-photon detector of single-photon detector based on avalanche diode or based superconductive nano wire;
Described single-photon detector array is silicon single-photon detector array, indium phosphorus/InGaAsP single-photon detector array, electron multiplying charge coupler or superconducting nano-wire single-photon detector array.
Further, described image-receptive processing module image-receptive delay process module is replaced;
Described image-receptive delay process module is connected with described quantum light source by monomode fiber, be connected with described image sending module by communication channel, receive described second photon of described quantum light source transmitting and described first detection time of described image sending module transmission; Described image-receptive delay process module comprises time dispersive element, the second single-photon detector and processor; Described second photon, through the process of described time dispersive element, injects described second single-photon detector after carrying out the time delay of different time according to the difference of frequency, and obtains described second detection time by described second single-photon detector detection; For the first detection time described in each, second detection time corresponding with it determined by described processor; The multiple delayed datas produced by described time dispersive element determined by described processor according to multiple described first detection time and corresponding multiple described second detection time, utilize described multiple delayed data, cross the picture that according calculation obtains object.
Further, described single-photon detector is the single-photon detector of single-photon detector based on avalanche diode or based superconductive nano wire;
Described time dispersive element is have the monomode fiber of group velocity dispersion, long-period gratings or diffraction grating pair.
According to delayed data, obtain the frequency of described second photon, obtain the frequency of the first photon according to the frequency of described second photon, obtain by the position of described first photon irradiation to object according to the frequency of described first photon, thus generate the picture of object.
Core concept of the present invention is: the feature that can effectively keep after utilizing the frequency degree of freedom information of photon to carry out long range propagation in telecommunication optical fiber channel, use fiber channel to the photon of frequency association to the distribution growing distance, can well keep in the associate feature of two photons at a distance of two remote places in the frequency degree of freedom after distribution.At two places of distribution, the photon of different frequency is projected the diverse location of different spatial direction irradiating objects by one place by spatial dispersion element, collect the single photon of reflection or transmission and utilize single-point single-photon detector to detect, the due in information of record photon.The photon of different frequency can be projected by spatial dispersion element the single-photon detector An arrayed recording photon that different spatial directions and then utilization have a certain space resolution capability and arrive information, the temporal information that also photon of different frequency can be arrived by sending into single-point single-photon detector record photon after time dispersive element by another place.Like this frequency association characteristic of two photons is transformed into space-space correlation or space-time association.By measuring the coincidence counting of two place's single photon events, the information of object can be recovered.The detector recording irradiating object photon is in this course that single-point detector does not have spatial discrimination.And do not had irradiating object by the photon with the single-photon detector array detection of certain space resolution capability.The recovery of object information must be obtained by both coincidence counting measurements.Therefore the function of quantum ghost image is achieved.The present invention utilizes optical fiber two photons can be delivered to apart from two remote places, achieves the function imagery exploitation quantum ghost image principle at a place being sent to another place by the long distance of fiber channel.
Embodiment:
As shown in Figure 1, the image delivery system based on quantum ghost image and monomode fiber of the present embodiment specifically comprises as lower part: the quantum light source 1 of the generation frequency association two-photon (the first photon and the second photon) of wide range; To two of frequency association monomode fibers that photon is distributed 4,5 in fiber channel; The transmit leg 2 (image sending module) of image and the recipient 3 (image-receptive processing module) of image.Wherein, the transmit leg 2 of image holds object to be imaged, and receives a photon of distribution by monomode fiber channel 4.The transmit leg 2 of image utilizes spatial dispersion element that the single photon of different frequency is irradiated to the different locus of object, collect the photon of detection reflection or transmission, and the temporal information of the single photon event received is sent to the recipient 3 of image by overt channel (transmit leg of image is believed to the communication of the recipient of image) 6.The recipient 3 of image leads to another photon of the monomode fiber channel 5 reception distribution photon centering of long-distance, and by spatial dispersion element, the photon of arrival is projected different directions according to the difference of frequency, and by there is the single-photon detector array detection of spatial resolving power and the corresponding positional information of record photon.The recipient 3 of image also can lead to another photon of the monomode fiber channel 5 reception distribution of long-distance, and be the time delay that the photon arrived introduces a frequency dependence by time dispersive element, utilize single-point single-photon detector (the second single-photon detector) to detect the temporal information of record photo-event.The spatial information of the single photon event that the recipient 3 of image detects according to oneself or temporal information and the temporal information of the single photon event of image transmit leg 2 received realize coincidence measurement, the result of coincidence measurement reflects the image-forming information of object, thus the recipient 3 of image can in spatial domain or time domain to image objects, the long distance of image realized based on quantum ghost image principle transmits.
Wherein, the quantum light source 1 producing frequency association photon right can be realized by nonlinear optics parametric process.The non-linear element that may be used for realizing this quantum light source comprises the crystal that can produce transition effects under two-stage parametric and the non-linear optical waveguide that can produce the three spontaneous four-wave mixing effects in rank.Can realize the crystal of transition effects under two-stage parametric and comprise various nonlinear optical crystal, periodically poled lithium niobate crystal, periodically poled lithium niobate waveguide, GaAs and indium phosphide etc. have the semi-conducting material of non-centrosymmetry lattice structure.The non-linear optical waveguide that can realize the three spontaneous four-wave mixing effects in rank comprises silica fiber, chalcogenide glass optical fiber, silicon waveguide, gallium nitride waveguide etc.The pump light of excitation non-linear process can be pulse pump light also can be continuous pump light.
The transmit leg 2 of image, according to the needs collecting reverberation or transmitted light, can adopt the structure of the structure of Fig. 2 or Fig. 3 to realize and is irradiated to the diverse location of object according to the frequency of photon and collects the function of detection.
The structure of Fig. 2 comprises optical fiber collimator 7, spatial dispersion element 8, condenser lens 9, image 10 to be sent, optical circulator 11, single-point single-photon detector 12 (the first single-photon detector).Single photon (the first photon) is sent in space through circulator 11 and optical fiber collimator 7, and after spatial dispersion element 8, the light of different frequency is propagated in different spaces direction, focuses on the diverse location of object 10 to be sent after lens 9; Object 10 to be sent has the light reflection of spatial distribution in such an embodiment, and the photon after reflection returns through former road, by after circulator 11 in an one port outgoing, record in feeding single-point single-photon detector 12.
The structure of Fig. 3 comprises, optical fiber collimator 7, spatial dispersion element 8, image 10 to be sent, optical fiber collecting device 13 and condenser lens 9, single-point single-photon detector 12 (the first single-photon detector).Single photon (the first photon) is transmitted into space optical path after optical fiber collimator 7, and after spatial dispersion element 8, the light of different frequency is propagated in different spaces direction, and line focus lens 9 focus on the diverse location of object 10 to be sent; Object 10 to be sent has the Transmission light of spatial distribution in such an embodiment, and the photon after transmission collects single-point single-photon detector 12 record through an optical fiber collecting device 13.
The light path design of the recipient 3 of the image in Fig. 1 can have two kinds of implementation structures, respectively by shown in Fig. 4 and Fig. 5.
In the structure of Fig. 4, comprise optical fiber collimator 14, spatial dispersion element 15 and the single-photon detector array 15 with spatial resolving power.Be distributed to the different frequency photon of the recipient 3 of image through optical fiber, after optical fiber collimator 14, be transmitted into space optical path, after spatial dispersion element 15, the photon of different frequency will be propagated at different direction in spaces.The single-photon detector array 16 with spatial resolving power is utilized to detect and the position of record photon arrival detector.
The structure of Fig. 5 comprises time dispersive element 17 and single-point single-photon detector 18 (the second single-photon detector).Be distributed to the different frequency photon of the recipient 3 of image through optical fiber, after elapsed time dispersion element 17, obtain different time delays.Utilize to have and detect compared with the single-point single-photon detector 18 of high time resolution characteristic, and the temporal information of record photo-event.
Wherein, optical fiber collimator can utilize lens combination, or concave mirror, or the optocoupler propagated in optical fiber synthesis quasi-parallel light is propagated by lenslike medium (comprising the Gradient Refractive Index Materials) etc. in space.
Wherein, the photo emissions of different frequency is comprised diffraction grating, balzed grating, prism, the dispersion elements such as spatial light modulator to the spatial dispersion element 8,15 in different directions.
Wherein, the time dispersive element 17 changing the photon arrival single-point single-photon detector 18 of different frequency comprises the various monomode fiber with group velocity dispersion, long-period gratings, diffraction grating equity.
The single-point single-photon detector 12,18 adopted comprises single-photon detector based on avalanche diode technology and based superconductive nanowire single photon detector.
These row 16 of the single-photon detector with spatial resolving power adopted can be silicon single-photon detector arrays, indium phosphorus/InGaAsP single-photon detector array, electron multiplying charge coupled apparatus (EMCCD), superconducting nano-wire single-photon detector array etc.Also can move by carrying out space to single-point single-photon detector the function that single photon detection is differentiated in implementation space.
The wide range frequency association photon of the present embodiment produces the spontaneous four-wave mixing effect of use femtosecond pulse pumped nonlinear silicon nanowire waveguide excitation, and the size of the silicon nanowire waveguide cross-section of use is 450x 220nm, and length is about 11mm.Define signal photon (1531 ± 8nm) and the idler photon (1570 ± 8nm) that spectrum width is about 16nm after utilizing the broad fluorescence Spectra of widely used Coarse Wavelength Division Multiplexing device (CWDM) paired pulses pump light pumped nonlinear silicon nanowire generation in optical communication to carry out filtering, and the frequency of signal photon and idler photon (the first photon and the second photon) is associated together.Signal photon (the first photon) in two photons of frequency association is sent to image transmit leg after one section of short fiber transmission, optical fiber collimator is utilized to convert spatial light emission to, line frequency of the going forward side by side degree of freedom is to the conversion of spatial degrees of freedom, and structure as shown in Figure 2.The spatial dispersion element wherein used is a balzed grating, and figure body to be imaged as shown in Figure 6 a.Object to be imaged shown in Fig. 6 a has the reflectivity of spatial distribution, and black part is divided and represented that reflectivity is high, and white portion represents that reflectivity is low.Object to be imaged is of a size of 160 μm of x 160 μm.To propagate in different spaces direction and the diverse location of irradiating object to the photon after spatial degrees of freedom conversion through the overfrequency degree of freedom.The one-dimensional grating used due to the present embodiment carries out spatial dispersion, and thus the hot spot of signal photon irradiating object defines a line segment, span about 200 μm, is laterally covering the scope of object to be imaged.
Idler photon (the second photon) utilizes the standard traffic monomode fiber of 50km to be distributed to the recipient of image.In the present embodiment, make use of the GVD (Group Velocity Dispersion) of standard traffic monomode fiber to carry out the conversion of the single photon frequency degree of freedom to the time degree of freedom.The GVD (Group Velocity Dispersion) coefficient of standard traffic monomode fiber is about 17ps/nm/km, is 14ns. according to the wave-packet duration after the broadening that the spectrum width of idler photon is estimated
What adopt the detection of single photon in the present embodiment is indium phosphorus/InGaAsP single-photon detector, and what adopt the time interocclusal record of single photon event is the Single Photon Counting module that resolving accuracy is about 164.6ps.The recipient of image is by the temporal information of the single photon event of the transmit leg of analysis image and the single photon event time information realization time domain coincidence measurement that oneself detects.Time domain coincidence measurement result reflects the reflectivity distribution of the object to be imaged in signal photon range of exposures.Fig. 6 b is a typical coincidence counting result, reflects the reflectivity distribution of the object to be imaged in signal photon range of exposures.
Due at image ground transmit leg, the different photon of frequency scatters and a linear regions of irradiating object at a direction in space through reflection-type balzed grating.The information of an object linear regions internal reflection that what each measurement obtained is.By being arranged on by object in space bit moving stage, mobile object utilizes the linear regions of photon irradiation to scan object to be imaged and duplicate measurements, can realize the transmission of two dimensional image to object.Fig. 6 c is the result of the two dimensional image of the object to be sent that the mode by scanning object to be imaged transmits.Object to be imaged is 10 μm at the moving step length perpendicular to signal photon illuminated line type region direction.The result of the present embodiment describes the long distance transmission that two system of the present invention can realize realizing in fiber channel based on quantum ghost image principle image.
Above execution mode is only for illustration of the present invention, but not limitation of the present invention.Although with reference to embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, various combination, amendment or equivalent replacement are carried out to technical scheme of the present invention, do not depart from the spirit and scope of technical solution of the present invention, all should be encompassed in the middle of right of the present invention.
Claims (10)
1., based on the image delivery system of quantum ghost image and monomode fiber, it is characterized in that, described system comprises:
Quantum light source, for generation of the first photon and second photon of frequency association;
Image sending module, is connected with described quantum light source by monomode fiber, receives described first photon that described quantum light source is launched; Described image sending module comprises the first spatial dispersion element and the first single-photon detector, and described first photon, through described first spatial dispersion element process, is transmitted into different directions according to the difference of frequency, irradiates object; Described first single-photon detector detects described first photon by reflections off objects or transmission, obtains the first detection time;
Image-receptive processing module, be connected with described quantum light source by monomode fiber, be connected with described image sending module by communication channel, receive described second photon of described quantum light source transmitting and described first detection time of described image sending module transmission; Described image-receptive processing module comprises second space dispersion element, single-photon detector array and processor; Described second photon, through the process of described second space dispersion element, is transmitted into different directions according to the difference of frequency, and is detected by a single-photon detector of corresponding position in described single-photon detector array, obtains the second detection time; Described processor, according to multiple described first detection time, multiple second detection time and the positional information measuring multiple single-photon detectors corresponding in the described single-photon detector single-photon detector array of described multiple second detection time, obtains the picture of object through according calculation.
2. system according to claim 1, is characterized in that, described image sending module also comprises optical circulator, optical fiber collimator and condenser lens;
Described first photon injects described optical fiber collimator through described optical circulator, injects described first spatial dispersion element after collimation process, and the first photon penetrated by described first spatial dispersion element is irradiated on object after described condenser lens; By described first photon of reflections off objects successively through described condenser lens, the first spatial dispersion element, optical fiber collimator and optical circulator, and inject described first single-photon detector by described optical circulator.
3. system according to claim 1, is characterized in that, described image sending module also comprises optical fiber collimator, condenser lens and optical fiber collecting device;
Described first photon injects described optical fiber collimator, injects described first spatial dispersion element after collimation process, and the first photon penetrated by described first spatial dispersion element is irradiated on object after described condenser lens; Described first photon of object transmission injects described first single-photon detector by after described optical fiber collecting device collection.
4. system according to claim 1, is characterized in that, described image-receptive processing module also comprises optical fiber collimator, and described second photon, after the process of described optical fiber collimator collimation, injects described second space dispersion compensation module.
5. system according to claim 1, is characterized in that, described quantum light source comprises pump light source and encouraged by described pump light source and produce the nonlinear optical element of described first photon and the second photon.
6. system according to claim 5, is characterized in that, described nonlinear optical element is the crystal of transition effects or the non-linear optical waveguide of the generation three spontaneous four-wave mixing effects in rank under generation two-stage parametric.
7. system according to claim 6, is characterized in that, under described generation two-stage parametric, the crystal of transition effects is the nonlinear optical crystal of non-centrosymmetry lattice structure and has the semi-conducting material of non-centrosymmetry lattice structure;
The non-linear optical waveguide of the spontaneous four-wave mixing effect in described generation three rank is silica fiber, chalcogenide glass optical fiber, silicon waveguide or gallium nitride waveguide;
Described pump light source is pulse pump light source or continuous pump light source.
8. system according to claim 1, is characterized in that, described second space dispersion element is diffraction grating, balzed grating, prism or spatial light modulator;
Described first single-photon detector is the single-photon detector of single-photon detector based on avalanche diode or based superconductive nano wire;
Described single-photon detector array is silicon single-photon detector array, indium phosphorus/InGaAsP single-photon detector array, electron multiplying charge coupler or superconducting nano-wire single-photon detector array.
9. the system according to any one of claim 1 to 8, is characterized in that, described image-receptive processing module image-receptive delay process module is replaced;
Described image-receptive delay process module is connected with described quantum light source by monomode fiber, be connected with described image sending module by communication channel, receive described second photon of described quantum light source transmitting and described first detection time of described image sending module transmission; Described image-receptive delay process module comprises time dispersive element, the second single-photon detector and processor; Described second photon, through the process of described time dispersive element, injects described second single-photon detector after carrying out the time delay of different time according to the difference of frequency, and obtains described second detection time by described second single-photon detector detection; For the first detection time described in each, second detection time corresponding with it determined by described processor; The multiple delayed datas produced by described time dispersive element determined by described processor according to multiple described first detection time and corresponding multiple described second detection time, utilize described multiple delayed data, cross the picture that according calculation obtains object.
10. system according to claim 9, is characterized in that, described second single-photon detector is the single-photon detector of single-photon detector based on avalanche diode or based superconductive nano wire;
Described time dispersive element is have the monomode fiber of group velocity dispersion, long-period gratings or diffraction grating pair.
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