CN102436117B - Generation device for continuous variable quantum entanglement source - Google Patents
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- CN102436117B CN102436117B CN2011103129788A CN201110312978A CN102436117B CN 102436117 B CN102436117 B CN 102436117B CN 2011103129788 A CN2011103129788 A CN 2011103129788A CN 201110312978 A CN201110312978 A CN 201110312978A CN 102436117 B CN102436117 B CN 102436117B
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Abstract
The invention provides a generation device for a continuous variable quantum entanglement state light field. The generation device comprises a single-frequency laser (1), an optical parameter amplifier (2), a Bell state direct detection system (3), a bottom plate (4) and an optical parameter amplifier locking system (5); the used optical components are fixed on the bottom plate (4);the optical parameter amplifier locking system (5) is formed by a scanning unit (11), a locking threshold value setting unit (12), a comparison unit (13) and a locking unit (14), therefore, automatic locking for the optical parameter amplifier is achieved, and problems of bad operability and reliability of the conventional continuous variable quantum entanglement source can be solved. The generation device has the advantages of stability, reliability, simpleness in operation and the like and is applicable to volume production.
Description
Technical field
The present invention relates to the generation device of the non-classical light field of a kind of continuous variable, specifically a kind of continuous variable Quantum Entangled States light field generation device.
Background technology
Quantum information science is that information science and quantum mechanics combine and the emerging cross discipline that forms, mainly comprises quantum calculation and quantum communications.Quantum communications comprise mainly that again quantum passes state, quantum cryptography and quantum dense coding etc. from thing.Due to the peculiar property of quantum entangled source, make quantum information improve arithmetic speed, guarantee information security, increase the ability that the aspects such as information capacity and raising accuracy of detection have the existing classical information system limits of breakthrough.
Quantum entangled source is the core of quantum communications and quantum calculation, realizes that the most important key of continuous variable quantum information and difficult point are the continuous variable Quantum Entangled States light sources for preparing stability and high efficiency.
So far, producing the most general method of continuous variable quantum entangled source is with single-frequency laser pump optical parametric oscillator, through non-linear process, produces non-classical light field.1992, the Kimble group of the U.S. nonlinear medium of the ktp crystal of II class phase matching as optics parametric oscillator (opo), by non-merger optical parameter amplification process, obtained compressed state optical field---the entangled light of two bundle polarized orthogonals.1998, they utilized the following degeneracy optical parameter of threshold value process to produce the quadrature phase squeezing light of two bundle frequencies into degenerations, by 50% beam splitter coupling, have obtained continuous variable quantum entanglement light beam.2000, photoelectricity research institute of University Of Shanxi adopts the Nd:YAP/KTP laser pumping of the single-frequency dual wavelength optical parametric amplifier of the ktp crystal of II class phase matching as nonlinear medium, when optical parametric amplifier runs on magnifying state, obtain the bright entangled light of orthogonal amplitude positive association, quadrature position phase anticorrelation.
But above-mentioned work all is in laboratory stage.So far, not relevant model machine and business-like continuous variable quantum entanglement product-derived.Its main cause is that the continuous variable quantum entangled source is to the having relatively high expectations of control system, and such as processes such as frequency stabilization of the locking of tangling optics parametric oscillator (opo) in origin system, pumping single-frequency laser used etc., all needs manually-operated.Therefore, above-mentioned continuous variable quantum entangled source does not possess ease for operation and reliability.Restrict the continuous variable quantum entangled source and from laboratory, moved towards reliable and stable product.
Summary of the invention
The object of the present invention is to provide a kind of simple to operate, reliable and stable generation device for continuous variable quantum entanglement source.
A kind of generation device for continuous variable quantum entanglement source of the present invention's design, comprise that single-frequency laser, optical parametric amplifier, Bel's state direct detection system, base plate and optical parametric amplifier locking system form; The described source generating device optical element used that tangles all is fixed on base plate, and base plate is served as by the less material of deformation coefficient, and this design has alleviated environmental change to tangling the impact in source, has improved stability and the reliability in the source of tangling; Described optical parametric amplifier locking system is set, compares, is locked four unit by scanning, lock threshold and forms, wherein scanning element is comprised of signal source, counter, digital regulation resistance and high voltage direct current amplifier, the lock threshold setup unit is comprised of voltage reference, waver, the first voltage follower, potentiometer and second voltage follower, and lock cell is comprised of PID circuit and high voltage direct current amplifier; In described optical parametric amplifier locking system, the output terminal of scanning element is connected with the piezoelectric ceramics on optical parametric amplifier through high-voltage amplifier, the light signal of optical parametric amplifier output incides in photodetector, and the direct current signal of photodetector output is connected with the positive input of comparing unit through the tertiary voltage follower; The output terminal of scanning element is connected with the positive input of comparing unit; In described optical parametric amplifier locking system, the output terminal of lock threshold setup unit is connected with the negative input of comparing unit; In described optical parametric amplifier locking system, the output terminal of comparing unit is connected with lock cell through the second electronic switch.
Scanning element is searched for the resonance point of optical parametric amplifier by the piezoelectric ceramics on the driving optical parametric amplifier.More near resonance point, the light signal of optical parametric amplifier output is stronger, and during away from resonance point, the light signal of optical parametric amplifier output dies down.The output light of optical parametric amplifier is converted to electric signal after photodetector, the electric signal of photodetector output and lock threshold are set to comparison, decides next step action of locking system.When photo detector signal was set less than lock threshold, scanning element continued scanning, and lock cell is in scanning mode.When this photo detector signal was set greater than lock threshold, scanning element stopped scanning, and lock cell automatically switches to lock-out state.Tangle the final stage of origin system debugging, regulate according to the photoelectric transformation efficiency of the size of optical parametric amplifier injected optical power and photodetector the size of lock threshold setting value.According to the height of comparer output level, control the duty of electronic switch, by electronic switch, determined the duty of PID circuit.When the photodetector output signal during less than the setting value of lock threshold, the comparer output low level, electronic switch Control PID circuit working is at monitored state.When the photodetector output signal during greater than the setting value of lock threshold, comparer output high level, electronic switch Control PID circuit working is at lock-out state.
Nonlinear medium in described optical parametric amplifier is the nonlinear crystal of II class noncritical phase matching.Utilize the frequency doubled light of single-frequency laser output as pumping source, fundamental frequency light is as injecting seed light, and pumping runs on the following optical parametric amplifier of threshold value, obtains frequencies into degeneration, the bimodulus compressed state optical field of polarization orthogonal.After the polarization beam apparatus beam splitting, can directly obtain entangled light source.
The described source base plate that tangles is by the moulding of precise numerical control machine time processing.This design has reduced machining error to tangling the impact of source Entanglement, for the commercialization of continuous variable quantum entangled source, batch production provide condition.
In described scanning element, the output terminal of signal source is connected with the input end of the first electronic switch, the output terminal of the first electronic switch is connected with the clock end of counter and digital regulation resistance respectively, the output terminal of counter is connected with the control end of digital regulation resistance, the output terminal of digital regulation resistance is connected with the bias input end of high-voltage amplifier, the logic control end of the first electronic switch and the output terminal of comparing unit be connected.The effect of signal source is to provide clock signal, and clock signal is supplied with counter and digital regulation resistance via electronic switch.During at scanning mode, electronic switch is connected when system works, and signal source offers counter and digital regulation resistance clock signal; During at lock-out state, electronic switch disconnects when system works, and digital regulation resistance is remained fixing output voltage.Often receive a clock signal, the output level of digital regulation resistance changes a step-length, and the increase and decrease of output level is determined by the output signal of counter.
In described lock threshold setup unit, fixing voltage reference is connected with waver, and the moving plate of waver is connected with potentiometer by the first voltage follower, and the center tap of potentiometer is connected with the forward input of comparing unit through the second voltage follower.Waver is used for selecting the lock threshold that separates point, and potentiometer is used for accurately setting the lock threshold point.
In described lock cell, the error signal of PID circuit provides after by the ac output end of photodetector and modulation signal mixing, error signal is connected with the input end of PID circuit through the second electronic switch, and the output terminal of PID circuit is connected with the gain signal input end of high-voltage amplifier.The output of high-voltage amplifier drives and is fixed on piezoelectric ceramics on optical parametric amplifier to control the chamber of optical parametric amplifier long.The error signal of optical parametric amplifier is extracted through mirror field, incides in photodetector.The ac signal demodulation of photodetector output feeds back on piezoelectric ceramics by the gain signal input end of PID circuit and high-voltage amplifier, realizes the locking of optical parametric amplifier.Relatively, the value that obtains is as the logical signal of controlling the optical parametric amplifier duty for the signal of the direct current signal of photodetector output and the output of lock threshold setup unit.When the direct current signal of the photodetector output setting value less than the lock threshold setup unit, the second electronic switch Control PID circuit working is at lock-out state, and the first electronic switch control counter stops counting simultaneously, and digital regulation resistance is remained current working point.When the direct current signal of the photodetector output setting value greater than the lock threshold setup unit, the second electronic switch Control PID circuit working is at unlocking condition, the first electronic switch is connected simultaneously, digital regulation resistance output scanning signal, the chamber of scanning optical parameter amplifier is long, the resonance point of search optical parametric amplifier, until the direct current signal of photodetector output is less than the setting value of lock threshold setup unit.
Compared with prior art a kind of generation device for continuous variable quantum entanglement source of the present invention's design has the following advantages:
The present invention adopts optical parametric amplifier automatic search locking system, easy operation is arranged, after steady operation, losing lock, automatically lock for a long time again, the advantages such as easy commercialization.
The present invention will tangle source optical element used and be fixed on a monoblock base plate, reduce environmental change to tangling the impact in source, improve stability and the reliability in the source of tangling.
The source of the tangling base plate of the present invention's design adopts the moulding of precise numerical control machine time processing, has reduced machining error to tangling the impact of source Entanglement, has the advantages such as easy commercialization and batch production.
In a word, a kind of generation device for continuous variable quantum entanglement source of the present invention's design has the advantages such as simple to operate, reliable and stable, suitable batch production, has important using value.
The accompanying drawing explanation
Fig. 1 is the theory diagram of a kind of generation device for continuous variable quantum entanglement source of the present invention; Wherein: 1-single-frequency laser, 2-optical parametric amplifier, 3-Bel state direct detection system, 4-base plate, 5-optical parametric amplifier locking system, 11-scanning element, 12-lock threshold setup unit, the 13-comparing unit, 14-lock cell, 34-photodetector.
Fig. 2 is the light path schematic diagram of a kind of generation device for continuous variable quantum entanglement source of the present invention; Wherein: 35-electro-optic phase modulator, 40-nonlinear crystal, 50-540nm optoisolator, 51-1080nm optoisolator.
Fig. 3 is the conspectus of optical parametric amplifier locking system in a kind of generation device for continuous variable quantum entanglement source of the present invention; Wherein: 21-resistance, 22-resistance, 23-waver, the 24-voltage reference, 25-the first voltage follower, 26-potentiometer, 27-second voltage follower, 28-signal source, 29-the first electronic switch, the 30-counter, 31-digital regulation resistance, 32-PID circuit, the 33-high-voltage amplifier, 36-high-frequency signal source, 37-frequency mixer, 38-tertiary voltage follower, 39-the second electronic switch.
Fig. 4 is the circuit diagram of the PID circuit 32 that uses in the present invention.
Embodiment
The present invention is a kind of generation device for continuous variable quantum entanglement source, as Figure 1-4.
Fig. 1 is theory diagram of the present invention, and with single-frequency laser 1 pump optical parameter amplifier 2, the light that tangles of optical parametric amplifier 2 outputs is measured with Bel's state direct detection system 3.In order to improve stability and the reliability of tangling source apparatus, single-frequency laser 1, optical parametric amplifier 2 and Bel's state direct detection system 3 all are fixed on a base plate 4.Optical parametric amplifier locking system 5 is used for autoscan locking optical parametric amplifier 2.
As shown in Figure 2, single-frequency laser 1 is the inner cavity frequency-doubling Nd:YAP/LBO laser instrument of laser diode end-face pump to the concrete index path of continuous variable quantum entanglement source apparatus, and the output wavelength of single-frequency laser 1 is 540nm.Because output coupling mirror is not exclusively launched fundamental frequency light, laser instrument also has a little 1080nm light output.Utilize ring resonator to choose single longitudinal mode, obtain stable single-frequency laser output.Plano-concave mirror and a nonlinear crystal 40 (ktp crystal of a-cutting) that optical parametric amplifier 2 is 50mm by two radius-of-curvature form, and ktp crystal is of a size of 3 * 3 * 10mm, the two antireflective films of two ends plating 1080nm and 540nm.All elements of optical parametric amplifier 2 all are fixed on the shelf of being made by Yin Gang.Ktp crystal carries out temperature control by the high accuracy temperature control instrument, and temperature-controlled precision is 0.01 ℃.A chamber mirror of optical parametric amplifier 2 is bonded on piezoelectric ceramics, for the long ACTIVE CONTROL in optical parametric amplifier 2 chambeies.The 1080nm light of single-frequency laser 1 output after electro-optic phase modulator 35,1080nm optoisolator 51 as flashlight injection optics parameter amplifier 2.The 540nm light of single-frequency laser 1 output after 540nm optoisolator 50 as pump light injection optics parameter amplifier 2.1080nm optoisolator 51 and 540nm optoisolator 50 can prevent that the reflected light of optical parametric amplifier 2 from feeding back to interior its stability that affects of single-frequency laser 1.Electro-optic phase modulator 35 is used for producing sideband in the sideband Locking System.Nonlinear crystal 40 is the ktp crystal of II class noncritical phase matching, and the light beam that participates in nonlinear interaction can be realized the conllinear coupling in this crystal, eliminated walk-off effect, obtains frequencies into degeneration, the bimodulus compressed state optical field of polarization orthogonal.After the polarization beam apparatus beam splitting, can directly obtain entangled light source.In experiment, the temperature of ktp crystal controls to phase matching temperature to 67 ℃.By Bel's state direct detection system 3, measure the Entanglement of optical parametric amplifier 2 output light.Measuring process is as follows, at first with polarization beam splitter prism, the signal mode of optical parametric amplifier 2 outputs is separated with idle mould, then uses 50% beam splitter (being comprised of two polarization beam splitter prisms and a half-wave plate) that two-beam is coupled.The bright light beam of beam splitter output is by two detector direct detections, the photocurrent addition of two detectors outputs, subtracts each other the rear degree of entanglement that spectrum analyzer is measured output light of sending into respectively.
The circuit diagram of optical parametric amplifier locking system 5 as shown in Figure 3, principle of work is as follows: the triangular signal H of scanning element 11 output notch cuttypes sends into the bias input end of high-voltage amplifier 33, the piezoelectric ceramics that signal amplifies on rear drive optical parametric amplifier 2 through high-voltage amplifier 33, the chamber of scanning optical parameter amplifier 2 is long.The chamber of optical parametric amplifier 2 is long more near resonance point, and the mirror field signal that photodetector 34 receives is less; The chamber of optical parametric amplifier 2 is long more away from resonance point, and the mirror field signal that photodetector 34 receives is larger.In scanning element 11, signal source 28 is used for providing pulse signal to counter 30 and digital regulation resistance 31, and clock signal provides and increases/down control signal to digital regulation resistance 31 after counter 30 frequency divisions.The first electronic switch 29 is by the break-make of the logical signal C control wave of comparing unit 13 outputs.When the logical signal C of comparing unit 13 outputs is high level, optical parametric amplifier locking system 5 is in scanning mode, the second electronic switch 39 turn-offs, PID circuit 32 quits work, the first electronic switch 29 is connected, the chamber of scanning optical parameter amplifier 2 is long, until after the signal A of direct current signal DC (being signal B after tertiary voltage follower 38) less than 12 outputs of lock threshold setup unit of photodetector 34 outputs, optical parametric amplifier locking system 5 automatically switches to lock-out state.When the logical signal C of comparing unit 13 outputs is low level, the second electronic switch 39 is connected, PID circuit 32 is started working, long according to the chamber of error signal J locking optical parametric amplifier 2, the first electronic switch 29 turn-offs, the output of digital regulation resistance 31 remains unchanged, and high-voltage amplifier 33 provides constant bias voltage for the piezoelectric ceramics in optical parametric amplifier 2.
In lock threshold setup unit 12, voltage reference 24 provides constant Voltage-output, when waver 23 is positioned at different contacts, through dividing potential drop, can obtain the magnitude of voltage of a series of separation.These magnitudes of voltage, after the first voltage follower 25, can be set the size of output voltage continuously by potentiometer 26, and second voltage follower 27 can prevent the interference of back circuit to the lock threshold setup unit.Lock threshold point be set in system debug the time set as the case may be, in scanning process, the maximal value of tracer signal B, generally be made as signal A peaked 20% by the size of lock threshold setup unit 12 output signal B.
Comparing unit 13 is used for the size of comparing signals A and signal B, and the signal C of output controls the duty (scanning or locking) of optical parametric amplifier locking system 5 by the logical relation of controlling the first electronic switch 29 and the second electronic switch 39.The error signal J of the signal of the AC signal of photodetector 34 outputs and high-frequency signal source 36 outputs conduct locking after frequency mixer 37 mixing.When the second electronic switch 39 is connected, error signal J sends into PID circuit 32, the output signal F of PID circuit 32 connects the gain input end of high-voltage amplifier 33, and the output signal E of high-voltage amplifier controls the piezoelectric ceramics on optical parametric amplifier 2, realizes the locking of optical parametric amplifier 2.
32 application of PID circuit are comparatively general, and as shown in Figure 4, error signal is from input end (In) input of PID circuit 32 for the PID circuit that the present invention uses, and control signal is from output terminal (Out) output of PID circuit 32.Signal K is connected with the input end (In) of PID circuit 32, and the output terminal of PID circuit 32 (Out) is connected with terminal F.
The components and parts that the embodiment of the present invention adopts, comparator circuit operational amplifier used adopts LM358, voltage follower operational amplifier used all adopts LM358, the model of the first electronic switch 29 is the DG418 that MAXIM company produces, the model of the second electronic switch 39 is the DG417 that MAXIM company produces, waver 23 adopts upper Neptunian satellite to interrogate the KXM-CX that electronics is produced, the BOURNS 3590S-2-10 that potentiometer 26 all adopts Mexico to produce, and maximum can be regulated 10 circles.Signal source 28 adopts Nanjing to contain the F80 of general production, the HEF4060B that counter 30 adopts PHILIPS company to produce, the MAX5481 that digital regulation resistance adopts MAXIM company to produce.
In the present invention, all generation device for continuous variable quantum entanglement sources all are fixed on a base plate 4, have improved the reliability of system; Tangle source base plate 4 by the moulding of precision machine tool time processing, make to tangle source and be easier to produce in batches and do not change the performance parameter of every; The optical parametric amplifier locking system 5 of design is easier to the operation in the source of tangling, and has improved the stability of optical parametric amplifier 2 locking processes.The acquisition of this device helps the continuous variable quantum entangled source to walk out laboratory, is widely used in the every field of national economy.
Claims (3)
1. a generation device for continuous variable quantum entanglement source, comprise single-frequency laser (1), optical parametric amplifier (2), Bel's state direct detection system (3), tangle source base plate (4) and optical parametric amplifier locking system (5), it is characterized in that tangling source generating device optical element used and be fixed on all that to tangle source base plate (4) upper, tangle source base plate (4) and served as by the less material of deformation coefficient, described optical parametric amplifier locking system (5) is by scanning element (11), lock threshold setup unit (12), comparing unit (13), lock cell (14) forms, wherein scanning element (11) is by signal source (28), the first electronic switch (29), counter (30) and digital regulation resistance (31) form, lock threshold setup unit (12) is by voltage reference (24), waver (23), the first voltage follower (25), potentiometer (26) and second voltage follower (27) form, lock cell (14) is comprised of PID circuit (32) and high voltage direct current amplifier (33), in described optical parametric amplifier locking system (5), the output terminal of scanning element (11) is connected with the piezoelectric ceramics on optical parametric amplifier (2) through high voltage direct current amplifier (33), the light signal of optical parametric amplifier (2) output incides in photodetector (34), and the direct current signal of photodetector (34) output is connected with the positive input of comparing unit (13) through tertiary voltage follower (38), in described optical parametric amplifier locking system (5), the output terminal of lock threshold setup unit (12) is connected with the negative input of comparing unit (13), in described optical parametric amplifier locking system (5), the output terminal of comparing unit (13) is connected with lock cell (14) through the second electronic switch (39),
In described scanning element (11), the output terminal of signal source (28) is connected with the input end of the first electronic switch (29), the output terminal of the first electronic switch (29) is connected with the clock end of digital regulation resistance (31) with counter (30) respectively, the output terminal of counter (30) is connected with the control end of digital regulation resistance (31), the output terminal of digital regulation resistance (31) is connected with the bias input end of locking system (14) mesohigh direct current amplifier (33), and the logic control end of the first electronic switch (29) is connected with the output terminal of comparing unit (13);
In described lock threshold setup unit (12), fixing voltage reference (24) is connected with waver (23), the moving plate of waver (23) is connected with potentiometer (26) by the first voltage follower (25), and the center tap of potentiometer (26) is connected with the positive input of comparing unit (13) through second voltage follower (27);
In described lock cell (14), the error signal of PID circuit (32) provides after by the ac output end of photodetector and modulation signal mixing, error signal is connected with the input end of PID circuit (32) through the second electronic switch (39), and the output terminal of PID circuit (32) is connected with the gain signal input end of high voltage direct current amplifier (33).
2. a kind of generation device for continuous variable quantum entanglement source according to claim 1, is characterized in that the nonlinear medium (40) in described optical parametric amplifier (2) is the nonlinear crystal of II class noncritical phase matching.
3. a kind of generation device for continuous variable quantum entanglement source according to claim 1, is characterized in that the described source base plate (4) that tangles is by the moulding of precise numerical control machine time processing.
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| CN112731352A (en) * | 2020-12-29 | 2021-04-30 | 北京环境特性研究所 | Target echo detection system and method based on continuous compression state laser |
| CN113050068B (en) * | 2021-03-31 | 2023-10-03 | 北京环境特性研究所 | Echo detection method and echo detection device for entangled light |
| CN113189768B (en) * | 2021-04-12 | 2022-11-11 | 山西大学 | Device and method for extracting vacuum side die |
| CN114967276B (en) * | 2022-05-07 | 2024-06-25 | 北京大学 | Low-noise on-chip parametric optical amplification device |
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| US7518784B2 (en) * | 2007-05-18 | 2009-04-14 | Wisconsin Alumni Research Foundation | Apparatus and method of producing quantum-entangled, up-converted light beams |
| CN101794961B (en) * | 2010-02-09 | 2011-07-20 | 山西大学 | Vacuum squeezed type light field generator |
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Effective date of registration: 20150325 Address after: Three, A1 District, No. 030000, South Central 401, hi tech Zone, Shanxi, Taiyuan Patentee after: Taiyuan Shanda Yuguang Technological Co., Ltd. Address before: 030006 Taiyuan, Xiaodian District, Shanxi City Road, No. 92 Patentee before: Shanxi Univeristy |