CN107346086A - The generation device of continuous variable quantum entanglement between quantum channel and quantum nodes - Google Patents
The generation device of continuous variable quantum entanglement between quantum channel and quantum nodes Download PDFInfo
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
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- G—PHYSICS
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/39—Non-linear optics for parametric generation or amplification of light, infrared or ultraviolet waves
- G02F1/392—Parametric amplification
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Abstract
The present invention relates to a kind of generation device of continuous variable quantum entanglement between quantum channel and quantum nodes.What the present invention mainly solved existing quantum channel and quantum nodes tangles that there is the technical problem of several forthright preparations.The technical scheme is that：This generation device, including light source cell, acousto-optic modulation system, optical parametric amplifier, optical beam-splitter, atomic system and tangle measuring system；The light source cell is provided with seed photo-signal aS1、aS2Output end, control optical signal aCOutput end and local oscillations optical signal aL1、aL2Output end；The seed photo-signal aS1、aS2It is connected by acousto-optic modulation system, optical parametric amplifier and optical beam-splitter with atomic system first input end；Control optical signal aCIt is connected by acousto-optic modulation system with the input of atomic system second；Atomic system is connected with tangling measuring system first input end；The output end of optical beam-splitter second is connected with tangling the input of measuring system second；Local oscillations optical signal aL1、aL2It is connected with tangling the input of measuring system the three, the 4th.
Description
Technical field
The present invention relates to a kind of generation device of continuous variable quantum entanglement between quantum channel and quantum nodes, is specifically
A kind of generation device of continuous variable quantum entanglement between light and atomic system, and by optical resonator enhance light and
Degree of entanglement between atomic system.
Background technology
Quantum entanglement not still one of quantum-mechanical important content, and be the core money of quantum-information transmission and processing
Source.Quantum entanglement between light field is experimentally produced, and is applied to a variety of quantum information agreements.Quantum internet
Can be by light and atomic building.Wherein, the just desired transmission carrier of quantum information.Atom can be interacted with light,
As quantum information processing and the node stored.Quantum entanglement between quantum channel and quantum nodes is to realize quantum internet
Important foundation.In addition, optical resonator can effectively strengthen light and atomic interaction, it is implemented for efficient
What quantum stored and prepared light and atomic system tangles source.
In 2005, the Kuzmich professors seminar of georgia ,U.S.A Polytechnics utilized spontaneous Raman scattering process system
For the photon of variables separation and tangling for atomic system, delivered in PRL 95,040405 (2005) entitled
" Entanglement of a Photon and a Collective Atomic Excitation " paper.In 2006,
University of California Institute of Technology Kimble professor seminar using spontaneous Raman scattering process be prepared for variables separation photon and
Atomic system tangles, and the coherence time of atomic system is extended to 21 delicate, is delivered in PRL 97,113603 (2006)
Entitled " Direct Measurement of Decoherence for Entanglement between a Photon
And Stored Atomic Excitation " paper.
Above research work using several forthright light and atomic entanglement for being prepared for variables separation of spontaneous Raman scattering process,
Solve light and atomic system tangles the technical problem of preparation, but also there is the problem of several forthright preparations for the above method.
The content of the invention
Tangle that there is several present invention aim to address the quantum channel of existing preparative separation variable and quantum nodes
The technical problem of forthright preparation, there is provided a kind of favorable expandability, compact-sized, quantum entanglement degree it is high can apply to quantum information
The generation of continuous variable quantum entanglement between quantum channel and quantum nodes that the continuous variable light and atomic system of network tangle
Device.
In order to solve the above technical problems, the technical solution adopted by the present invention is：Utilize two optical parametric amplifiers and light
Learn beam splitter generation continuous variable and tangle light pulse pair, pass through the write-in for the transparent mechanism of electromagnetically induced that optical resonator strengthens
Journey, the quantum state of one of light pulse is expeditiously mapped in atomic system, deterministically establishes light and atomic system
Between quantum entanglement；And in the presence of light is read, by measuring the associate feature of release light pulse and another light pulse,
Verify the Entanglement of light and atomic system.
The generation device of continuous variable quantum entanglement between quantum channel and quantum nodes, including light source cell, five sets of sound
Light modulation system, two optical parametric amplifiers, 50：50 optical beam-splitters, atomic system and tangle measuring system；The light source
Unit is provided with two beam seed photo-signal aS1、aS2Output end, control optical signal aCOutput end and two beam local oscillations optical signal aL1、
aL2Output end；The two beams seed photo-signal aS1、aS2Output end is connected with second, third acousto-optic modulation system input respectively,
Second, third acousto-optic modulation system output is connected with two optical parametric amplifier inputs respectively, and two optical parameters are put
Big device output end be connected with the 4th, fifth sound light modulation system input respectively, the 4th, fifth sound light modulation system output end and
50：Two inputs connection of 50 optical beam-splitters, 50：50 the first output ends of optical beam-splitter and atomic system first input end
Connection；Control optical signal aCOutput end is connected with the first acousto-optic modulation system input, the first acousto-optic modulation system output with
The input of atomic system second connects；Atomic system output end is connected with tangling measuring system first input end；50：50 optics point
The output end of beam device second is connected with tangling the input of measuring system second；Two beam local oscillations optical signal aL1、aL2Output end is distinguished
It is connected with tangling the input of measuring system the three, the 4th.
The light source cell is by tunable laser, single mode 1x4 fiber couplers, single mode 1x2 fiber couplers and a set of
Acousto-optic modulation system forms.Tunable laser output end is connected with single mode 1x4 fiber coupler inputs, single mode 1x4 optical fiber
The output end of coupler first is connected with single mode 1x2 fiber coupler inputs, and single mode 1x2 fiber couplers export two beams and locally shaken
Swing optical signal aL1、aL2, single mode 1x4 the second output ends of fiber coupler are connected with acousto-optic modulation system input, acousto-optic modulation system
Unite output control optical signal aC, two beam seed photo-signal a of the output end of single mode 1x4 fiber couplers the three, the 4th outputS1、aS2.Institute
Tunable laser is stated using low noise, narrow linewidth, tunable ti sapphire laser.
The atomic system is made up of atomic components and optical resonator.The optical resonator is by three flat hysteroscopes, two
Set focal length is respectively 550mm, -500mm lens group composition；Optical resonator uses three mirror ring cavity structures, and its chamber is a length of
705mm；For the first flat hysteroscope as input and output coupling mirror, the transmitance to probe light is 15%；Second, third flat hysteroscope
It is high to probe light anti-；Second flat hysteroscope is fixed on piezoelectric ceramics.
Described two optical parametric amplifiers are operated in the anti-magnifying state of parameter, produce orthogonal amplitude squeezed light；Described 50：
The two-arm intervention phase difference of 50 optical beam-splitters is controlled at 90 degree.
Present invention employs above-mentioned technical proposal, the quantum that continuous variable EPR is tangled to preparation and the chamber enhancing of light stores
It is combined, deterministically prepares the quantum entanglement of continuous variable light and atomic system.Optical parametric amplifier is non-classical optical state
One of effective preparation means.The quantum that the transparent mechanism of electromagnetically induced is applied to non-classical optical state stores.Above-mentioned technology is mutually tied
Close, the quantum entanglement of continuous variable light and atomic system can be prepared.Meanwhile light and atom system can be strengthened by optical resonator
The interaction of system, improve the degree of entanglement of light and atomic system.Therefore, compared with background technology, the present invention has certainty system
The advantages of standby and measurement, while enhance by optical resonator the quantum entanglement degree of light and atomic system.What the present invention designed
The generation device that light and atomic system tangle has following beneficial effect：
1st, the write-in effect of the electromagnetically induced clearing process for the optical resonator enhancing that the present invention is utilized, it is continuous by one
The quantum state that variable EPR tangles light pulse is expeditiously mapped in an atomic system, deterministically establishes light and atom system
The quantum entanglement of system.
2nd, the optical resonator that the present invention is utilized can strengthen the phase of light and atomic system in electromagnetically induced clearing process
Interaction, improves continuous variable quantum storage efficiency, and the final degree of entanglement for causing light and atomic system uprises.
3rd, the reading effect of the electromagnetically induced clearing process for the optical resonator enhancing that the present invention is utilized, by atomic system
Quantum state be mapped in release light pulse, can be true by measuring release light and another tangles the correlated noise of light pulse
The quantum entanglement of qualitative checking light and atomic system.
4th, the autgmentability that has had of the present invention, can using it is multiple tangle light pulse and stored with multiple highly effective quantums mutually tie
Close, the Quantum Correlation established between multiple quantum channels and multiple quantum nodes, the quantum information network for future.Pass through frequency
Rate converts, and the quantum state frequency of one of quantum channel can match with optical fiber transmission window, for quantum communications；By with
Matter interaction, one of quantum channel can carry out quantum information processing；By quantum entanglement transfer, one of amount
Subchannel can connect with other quantum networks, realize quantum internet.
The quantum entanglement of continuous variable quantum channel and quantum nodes caused by the present invention, is suitably applied comprising atom
Quantum information network, the transmission tangled with quantum state particularly established between quantum information network node.
Brief description of the drawings
Fig. 1 the structural representation of present invention；
The structural representation of Fig. 2 light source cells of the present invention；
The energy level schematic diagram of Fig. 3 atomic systems of the present invention；
The control sequential figure of Fig. 4 optical signals of the present invention；
The structural representation of Fig. 5 atomic systems of the present invention；
The structural representation of Fig. 6 measuring systems of the present invention.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.
As shown in figure 1, between a kind of quantum channel and quantum nodes in the present embodiment continuous variable quantum entanglement production
Generating apparatus, including 1, five set of acousto-optic modulation system 21-25 of light source cell, two optical parametric amplifier 31-32,50：50 optics
Beam splitter 4, atomic system 5 and tangle measuring system 6；The light source cell 1 is provided with two beam seed photo-signal aS1、aS2Output end,
Control optical signal aCOutput end and two beam local oscillations optical signal aL1、aL2Output end；The two beams seed photo-signal aS1、aS2It is defeated
Go out end to be connected with second, third acousto-optic modulation system 22,23 inputs respectively, the output of second, third acousto-optic modulation system 22,23
End be connected respectively with two optical parametric amplifiers 31,32 inputs, two optical parametric amplifiers 31,32 output ends respectively with
4th, fifth sound light modulation system 24,25 inputs connection, the 4th, fifth sound light modulation system 24,25 output ends and 50：50
Two inputs connection of optical beam-splitter 4,50：The output end of 50 optical beam-splitter 4 first connects with the first input end of atomic system 5
Connect；Control optical signal aCOutput end is connected with the input of the first acousto-optic modulation system 21, the output end of the first acousto-optic modulation system 21
It is connected with the input of atomic system 5 second, the output end of atomic system 5 is connected with tangling the first input end of measuring system 6；50：50
The output end of optical beam-splitter 4 second is connected with tangling the input of measuring system 6 second；Two beam local oscillations optical signal aL1、aL2It is defeated
Go out end to be connected with tangling the input of measuring system 6 the three, the 4th respectively.
As shown in Fig. 2 the light source cell is by tunable laser 11, single mode 1x4 fiber couplers 12, single mode 1x2 light
Fine coupler 13 and a set of acousto-optic modulation system 14 form.The output end of tunable laser 11 and single mode 1x4 fiber couplers 12
Input is connected, and the output end of single mode 1x4 fiber couplers 12 first is connected with the input of single mode 1x2 fiber couplers 13, single mode
1x2 fiber couplers 13 export two beam local oscillations optical signal aL1、aL2, the output end of single mode 1x4 fiber couplers 12 second and sound
The input of light modulation system 14 connects, the output control optical signal a of acousto-optic modulation system 14C, single mode 1x4 fiber couplers 12
3rd, the 4th output end exports two beam seed photo-signal aS1、aS2.The tunable laser 11 using low noise, narrow linewidth, can
Ti sapphire laser is tuned, ti sapphire laser exports 795nm laser, corresponding to the D1 Absorption Lines of the atom of rubidium 87.Acousto-optic is adjusted
System 14 processed is made up of two sets of double 1.7GHz passed through acousto-optic modulator, for realizing frequency displacement, acquisition and seed photo-signal
Frequency phase-difference 6.8GHz control optical signal aC。
As shown in figure 3, the atomic system 5 is using the 5 of the atom of rubidium 872S1/2F=1 and F=2 and 52P1/2F '=1
Hyperfine energy level.Using the shift frequency characteristic of the tuning characteristic harmony light modulation system 14 of ti sapphire laser 11, obtain corresponding
The optical signal of wavelength.Control optical signal aCFrequency and 52S1/2F=1 to 52P1/2F '=1 transition absorption line have Δ=
700MHz single photon off resonance；Seed light aSWith local oscillations light aLFrequency it is identical, the frequency and 52S1/2F=2 to 52P1/2
The transition absorption line of F '=1 have Δ=700MHz single photon off resonance and δ=0.5MHz two-photon mismatching angle.
As shown in figure 4, using five sets of acousto-optic modulation system 21-25 switching characteristic, each optical signal in light source cell 1 is realized
SECO.Whole controlling cycle takes 1 millisecond.The local oscillations optical signal of balanced homodyne detection system is normally opened, exports strong
Local oscillations optical signal aL1And aL2.In 10 microseconds of light and atomic interaction, second, third acousto-optic modulation system is utilized
22nd, 23 by seed photo-signal aS1、aS2Close, remaining time opens and exports strong simulated light, for amplifying to optical parameter
The locking of optical resonator in device and quantum storage.In probe optical pulse signal and atomic interaction time, using the 4th,
Fifth sound light modulation system 24,25 is by probe optical signal aP1、aP2Opened for 500 nanoseconds, stored for quantum.In probe optical signal
While opening, optical signal a will be controlled using first sound-optic modulator 21C1 microsecond is opened, realizes probe optical signal aP1Quantum
Storage；After the storage time of 100 nanoseconds, it is again turned on controlling optical signal a using first sound-optic modulator 21C, by atom system
The quantum state of system is read.
As shown in figure 1, described two optical parametric amplifiers 31,32 are operated in the anti-magnifying state of parameter, orthogonal shake is produced
Width squeezed light aS1And aS2.Described 50：The two-arm intervention phase difference of 50 optical beam-splitters 4 is controlled at 90 degree.
As shown in figure 5, the atomic system 5 is made up of atomic components and optical resonator.The atomic components are by atom
Air chamber 51, magnetic shielding system and temperature control system 54 are formed, and the magnetic shielding system is made up of magnetic cup wallpaper 52 and magnetic shielding cylinder 53；
The atomic air chamber 51 is coated with laser phase filled with atomic gas and a certain amount of inert buffer gas in the light pass surface of atomic air chamber
Answer the antireflective film of wavelength；The outer layer magnetic screen paper 52 of atomic air chamber 51 wraps up, and is positioned in the magnetic shielding cylinder 53 of metal；
Rubidium atom is heated simultaneously using the temperature control system 54 of heating tape, insulation material and temperature control instrument composition in the outer layer of magnetic shielding cylinder 53
And accurate temperature controlling.The optical resonator by three flat hysteroscopes 55,56,57 and two sets of focal lengths be respectively 550mm, -500mm it is saturating
Microscope group 58,59 forms；Optical resonator uses three mirror ring cavity structures, a length of 705mm of its chamber；The first flat hysteroscope 55 and
Two flat hysteroscopes 56 are located at the both sides of atomic components and are located at probe optical signal aP1Input path on, the 3rd flat hysteroscope 57 is located at spy
Pin optical signal aP1Reflected light path on；First flat hysteroscope 55 is 15% to the transmitance of probe light as input and output coupling mirror；
Second, third flat 56,57 pairs of probe light of hysteroscope is high anti-；Second flat hysteroscope 56 is fixed on piezoelectric ceramics, for realizing optics
The locking of resonator and probe photoresonance；Two sets of focal lengths are respectively that 550mm, -500mm lens group 58,59 are respectively provided at first
It is high to probe light saturating between flat 55 and the 3rd flat hysteroscope 57 of hysteroscope of flat 55 and the 3rd flat hysteroscope 57 and second of hysteroscope, by intracavitary light
Spot amplifies, to increase the region of light and atomic interaction.
As shown in fig. 6, the measuring system 6 of tangling is by two sets of balanced homodyne detection systems 64,65, power adder-subtractor 66
Formed with digital oscilloscope 67 can be stored；First set balanced homodyne detection system 64 is by 50：50 optical beam splitting piece 60a, two it is flat
Homodyne detector 61a, the 62a and power subtracter 63a that weigh is formed, and second set of balanced homodyne detection system 65 is by 50：50 optics point
Beam piece 60b, balanced homodyne detection device two 61b, 62b and power subtracter 63b are formed；Two sets of balanced homodyne detection system difference
Release light pulse signal a ' to atomic system 5P1With probe optical pulse signal aP2Quadrature component measure；Finally by
Power adder-subtractor 66 and digital oscilloscope 67 can be stored their correlated noise is measured, analyzed, verify continuous variable
Light and atomic system tangle, that is, tangling between quantum channel and quantum nodes.
Light and atomic system Entangled State can be judged according to Duan Luming et al. inseparable criterions proposed.If release
Give out light pulse signal a 'P1With probe optical pulse signal aP2Correlated noise meet such as lower inequality：
<δ2(Xa'P1+XaP2)>+<δ2(Ya'P1-YaP2)>≤4,
So, light pulse signal a ' is dischargedP1With probe optical pulse signal aP2Between exist tangle, also just establish light and
Exist between atomic system and tangle.Wherein, X and Y represents orthogonal amplitude and orthogonal position phase component respectively.
Claims (4)
- A kind of 1. generation device of continuous variable quantum entanglement between quantum channel and quantum nodes, it is characterised in that：Including light Source unit, five sets of acousto-optic modulation systems, two optical parametric amplifiers, 50：50 optical beam-splitters, atomic system and tangle measurement System；The light source cell is provided with two beam seed photo-signal aS1、aS2Output end, control optical signal aCOutput end and two beams locally shake Swing optical signal aL1、aL2Output end；The two beams seed photo-signal aS1、aS2Output end respectively with second, third acousto-optic modulation system Input is connected, and second, third acousto-optic modulation system output is connected with two optical parametric amplifier inputs respectively, two Optical parametric amplifier output end is connected with the 4th, fifth sound light modulation system input respectively, and the 4th, fifth sound light modulation system Output end of uniting and 50：Two inputs connection of 50 optical beam-splitters, 50：50 the first output ends of optical beam-splitter and atomic system First input end connects；Control optical signal aCOutput end is connected with the first acousto-optic modulation system input, the first acousto-optic modulation system System output end is connected with the input of atomic system second；Atomic system output end is connected with tangling measuring system first input end； 50：50 the second output ends of optical beam-splitter are connected with tangling the input of measuring system second；Two beam local oscillations optical signal aL1、 aL2Output end is connected with tangling the input of measuring system the three, the 4th respectively.
- 2. the generation dress of continuous variable quantum entanglement between a kind of quantum channel according to claim 1 and quantum nodes Put, it is characterised in that：The light source cell is by tunable laser, single mode 1x4 fiber couplers, single mode 1x2 fiber couplers Formed with a set of acousto-optic modulation system；Tunable laser output end is connected with single mode 1x4 fiber coupler inputs, single mode The output end of 1x4 fiber couplers first is connected with single mode 1x2 fiber coupler inputs, single mode 1x2 fiber couplers output two Beam local oscillations optical signal aL1、aL2, single mode 1x4 the second output ends of fiber coupler are connected with acousto-optic modulation system input, sound Light modulation system output control optical signal aC, the output end of single mode 1x4 fiber couplers the three, the 4th two beam seed photo-signals of output aS1、aS2。
- 3. the generation dress of continuous variable quantum entanglement between a kind of quantum channel according to claim 1 and quantum nodes Put, it is characterised in that：The atomic system is made up of atomic components and optical resonator；The optical resonator is by three flat chambers Mirror and two sets of focal lengths are respectively 550mm, -500mm lens group composition；Optical resonator uses three mirror ring cavity structures, its chamber A length of 705mm；For the first flat hysteroscope as input and output coupling mirror, the transmitance to probe light is 15%；Second, third is flat Hysteroscope is high to probe light anti-；Second flat hysteroscope is fixed on piezoelectric ceramics.
- 4. the generation dress of continuous variable quantum entanglement between a kind of quantum channel according to claim 1 and quantum nodes Put, it is characterised in that：Described two optical parametric amplifiers are operated in the anti-magnifying state of parameter, produce orthogonal amplitude squeezed light； Described 50：The two-arm intervention phase difference of 50 optical beam-splitters is controlled at 90 degree.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109004990A (en) * | 2018-10-23 | 2018-12-14 | 广西民族大学 | A kind of two-way controllable long-range preparation system of light quantum state |
| CN110658634A (en) * | 2019-08-28 | 2020-01-07 | 西安空间无线电技术研究所 | Processing system and method for continuously variable polarization and orbital angular momentum hybrid entanglement |
| CN113726448A (en) * | 2021-09-01 | 2021-11-30 | 北京理工大学 | Continuous variable strong entanglement coherence enhancing device based on nonlinear beam splitter |
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| CN113726448A (en) * | 2021-09-01 | 2021-11-30 | 北京理工大学 | Continuous variable strong entanglement coherence enhancing device based on nonlinear beam splitter |
| CN113726448B (en) * | 2021-09-01 | 2022-05-24 | 北京理工大学 | Continuous variable strong entanglement coherence enhancing device based on nonlinear beam splitter |
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