CN107450250A - A kind of polarization-entangled photon pair source selected after nothing - Google Patents
A kind of polarization-entangled photon pair source selected after nothing Download PDFInfo
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- CN107450250A CN107450250A CN201710689826.7A CN201710689826A CN107450250A CN 107450250 A CN107450250 A CN 107450250A CN 201710689826 A CN201710689826 A CN 201710689826A CN 107450250 A CN107450250 A CN 107450250A
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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
- G02F1/3501—Constructional details or arrangements of non-linear optical devices, e.g. shape of non-linear crystals
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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
- G02F1/3526—Non-linear optics using two-photon emission or absorption processes
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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
- G02F1/355—Non-linear optics characterised by the materials used
- G02F1/3551—Crystals
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Abstract
The invention discloses the polarization-entangled photon pair source selected after a kind of nothing, including：Lithium niobate crystal chip, vertical bar optical waveguide, tapered optical waveguide, period polarized structure I, period polarized structure I I, wavelength division multiplexer.The lithium niobate crystal chip is that Z cuts Y biographies or Z cuts X biographies；The vertical bar optical waveguide is that titanium spreads optical waveguide；The tapered optical waveguide is that titanium spreads optical waveguide, serves the effect of patten transformation；The period polarized structure I produces TE polarizations, wavelength X1Photon 11 and TM polarization, wavelength X2Photon 12；The period polarized structure I I produces TE polarizations, wavelength X2Photon 21 and TM polarization, wavelength X1Photon 22；Photon is separated and realizes the generation of polarization-entangled state by the wavelength division multiplexer to 11,12 and 21,22 by wavelength, without using rear selection course of the prior art, can effectively improve the generation efficiency of polarization-entangled photon pair.
Description
Technical field
The present invention relates to the quantum communication technical field such as quantum key distribution, quantum repeater, quantum cryptography, particularly relate to
A kind of and polarization-entangled photon pair source selected after nothing.
Background technology
The technology that Quantum Entangled States are distributed between different location is quantum cryptographic system and increasingly complex
The basis of quantum network, among these it is particularly noticeable be can compatible current fiber optic communication channel quantum entanglement communication
Network.In quantum entanglement communication network, the distribution of Entangled State between parties relies on entangled photons to carry out, and this
Often selection is communication band of the wavelength at 1.55 microns to kind photon.Therefore, compatible light fiber communication wave band, compact and reliable
Entangled photon pairs source for lifted the quantum entanglement communication technology practical value have highly important effect.
In the various methods for producing entangled photon pairs source, interpreter under the Spontaneous Parametric based on nonlinear optical crystal
System is used with its higher photon to the structure of generation efficiency and simplicity by more extensive, particularly high efficiency, height
The entangled photon pairs of brightness can be obtained by integrated optics technique.Each rank light wave under nonlinear interaction is bound by optics
In waveguide, compared with corresponding bulk optical nonlinear crystal, its conversion efficiency can realize the lifting of several orders of magnitude.
Lithium columbate crystal has the waveguide fabrication technique of maturation and is easily achieved the period polarized technique of quasi-phase matched,
It is for producing based on one of the most commonly used material of the polarization-entangled photon pair source changed the mechanism under Spontaneous Parametric.Expanded based on titanium
Generation (a kind of Spontaneous Parametric of the photon pair in identical polarization state can be realized by dissipating the periodically poled lithium niobate crystal of optical waveguide
Lower transformation mechanism) and photon pair in orthogonal polarisation state generation (being changed the mechanism under two class Spontaneous Parametrics).
The technical scheme of the existing polarization-entangled photon pair source based on periodically poled lithium niobate optical waveguide refers to following
Documents and materials：
1.T.Suhara, Laser＆Photon.Rev.3,370-393 (2009)
2.S.Tanzilli, H.De Riedmatten, W.Tittel, H.Zbinden, P.Baldi, M.De Micheli,
D.B.Ostrowsky, and N.Gisin, Electron.Lett.37,26-28 (2001)
3.M.Fiorentino, S.M.Spillane, R.G.Beausoleil, T.D.Roberts, P.Battle, and
M.W.Munro, Opt.Express 15,7479-7488 (2007)
4.A.B.U ' Ren, Ch.Silberhorn, K.Banaszek, andI.A.Walmsley, Phys.Rev.Lett.93
093601(2004).
5.G.Fujii, N.Namekata, M.Motoya, S.Kurimura, and S.Inoue, Opt.Express 15,
12769-12776(2007).
6.A.Martin, A.Issautier, H.Herrmann, W.Sohler, D.B.Ostrowsky, O.Alibart,
And S.Tanzilli, New J.Phys.12,103005 (2010)
7.T.Suhara, H.Okabe, and M.Fujimura, IEEE Photon.Technol.Lett.19,1093-
1096(2007).
8.S.Tanzilli, A.Martin, F.Kaiser, M.P.De Micheli, O.Alibart, and
D.B.Ostrowsky, Laser＆Photonics Reviews 6,115-143 (2011)
9.F.Kaiser, A.Issautier, L.A.Ngah, O.Dnil, H.Herrmann, W.Sohler, A.Martin,
And S.Tanzilli, New J.Phys.14,085015 (2012)
Fig. 1 is shown based on the polarization-entangled photon changed the mechanism under two class Spontaneous Parametrics to producing principle schematic.Niobium
Vertical bar optical waveguide 3-1 and period polarized structure 2 in sour lithium chip 1, i.e., period polarized optical waveguide, polarized available for producing
Entangled photon pairs 4, wherein label H represent the photon of TE polarization states, and label V represents the photon of TM polarization states.The beam splitting of beam splitter 5
Ratio is 50: 50, and the reflection to photon can be achieved or transmit and accordingly arrive at single-photon detector 7-1 or 7-2.
The cross-polarization photon resulted from period polarized optical waveguide is represented by 4 wave function | ψ>=| H>|V>,
Wherein | H>The wave function of the photon of TE polarization states is represented, | V>Represent the wave function of the photon of TM polarization states.When photon arrives to 4
When beam splitting ratio is 50: 50 beam splitter 5, after beam splitting acts on, the ripple of single-photon detector 7-1 and 7-2 photon pair is arrived at
Function is represented by | ψ>=1/2 (| H>1|V>2+|V>1|H>2+|HV>1|0>2+|0>1|HV>2), in formula | H>1(|V>1) represent TE
(TM) photon of polarization state has arrived at single-photon detector 7-1, | H>2(|V>2) represent that the photon of TE (TM) polarization state has arrived at list
Photon detector 7-2, in formula | 0>1Or | 0>2Indicate that no photon arrives at single-photon detector.
As can be seen here, the generation mechanism of existing polarization-entangled photon pair be there are problems that as follows：Beam splitting ratio is 50: 50
The use of beam splitter 5 so that only half quantity, photon pair in orthogonal polarisation state, i.e., | H>1|V>2With | V>1|H>2Can
To be exported respectively from the two of beam splitter output end and arrive at single-photon detector 7-1 and 7-2 respectively, thus can produce effectively
Polarization-entangled stateAnd the photon of second half quantity is right | HV>1|0>2With | 0>1|HV
>2Then simultaneously it can arrive at single-photon detector 7-1 or single-photon detecting simultaneously from the either end output of two output ends of beam splitter simultaneously
Device 7-2 is surveyed, thus the generation to polarization-entangled state does not provide any contribution.
Therefore, the polarization-entangled photon that prior art uses is to producing scheme, it has to increases when detectable signal is handled
The process of " rear selection ", by effective polarization-entangled photon to, to being chosen in distribution, being obtained from all possible photon
Wave function isPolarization-entangled photon pair.The use of " rear selection " process, is reduced
The generation efficiency of polarization-entangled photon pair, the technical difficulty for meeting technology signal transacting is added, reduce quantum entanglement secrecy system
The noise and error of system, thus limit engineer applied of this polarization-entangled photon pair source in quantum communications field.
The content of the invention
The problem of existing for prior art, the present invention propose the polarization-entangled photon pair source selected after a kind of nothing, wrap
Include：Lithium niobate crystal chip 1, vertical bar optical waveguide 3-1, tapered optical waveguide 3-2, period polarized structure I, period polarized structure I I,
Wavelength division multiplexer 6.
The lithium niobate crystal chip 1 is optical grade lithium niobate body material wafers, and crystal tangentially cuts Y biographies for Z or Z cuts X biographies, chip
Thickness is 0.1mm to 1mm.
The vertical bar optical waveguide 3-1 is that titanium spreads optical waveguide, is made in lithium niobate crystal chip 1, waveguide length exists
10mm to 60mm, for making vertical bar optical waveguide 3-1 titanium bar width at 5 to 7 μm.
The tapered optical waveguide 3-2 is that titanium spreads optical waveguide, is made in lithium niobate crystal chip 1, the tapered optical
Waveguide 3-2 length is linearly changed in 10mm to 20mm, the titanium bar width for making tapered optical waveguide 3-2 from 1 μm
Vertical bar optical waveguide 3-1 titanium bar width.
The period polarized structure I and period polarized structure I I are made on vertical bar optical waveguide 3-1, are in for producing
The photon of orthogonal polarisation state is to 11,12,21,22.
The polarization cycle Λ of the period polarized structure I1With period polarized structure I I polarization cycle Λ2Differ as 0.5 μm
To 1 μm.
Photon caused by the period polarized structure I to including：
● photon 11 (TE polarization states, wavelength λ1)；
● photon 12 (TM polarization states, wavelength λ2)。
Photon caused by the period polarized structure I I to including：
● photon 21 (TE polarization states, wavelength λ2),
● photon 22 (TM polarization states, wavelength λ1)。
It is λ that the wavelength division multiplexer 6, which has wavelength,1It is λ with wavelength2Two output ports, for being λ by wavelength1And wavelength
For λ2Photon separate.
In the output port λ of wavelength division multiplexer 61Obtained photon to including：
● result from photon 11 (TE polarization states, the wavelength λ of period polarized structure I1)；
● result from period polarized structure I I photon 22 (TM polarization states, wavelength λ1)。
In the output port λ of wavelength division multiplexer 62Obtained photon to including：
● result from photon 12 (TM polarization states, the wavelength λ of period polarized structure I2)；
● result from period polarized structure I I photon 21 (TE polarization states, wavelength λ2)。
As can be seen here, as the output port λ of wavelength division multiplexer 61With output port λ2Respectively with single-photon detector 7-1
When being connected with single-photon detector 7-2 and carrying out coincidence counting measurement, the output port λ of wavelength division multiplexer 6 is connected1Monochromatic light
It is photon 11 or photon 22 that sub- detector 7-1, which will be unable to tell counted photon,.Likewise, connection wavelength division multiplexer
6 output port λ2Single-photon detector 7-2 to will be unable to tell counted photon be photon 12 or photon 21.Cause
This, when photon arrives at single-photon detector 7-1 and 7-2 simultaneously to 11 and 22,12 and 21, i.e., is in polarization-entangled stateNeed not be that polarization-entangled state can be achieved using rear selection course of the prior art
Produce.
Compared with prior art, the method have the benefit that：Polarization-entangled photon pair source proposed by the invention,
It need not be that the generation of polarization-entangled state can be achieved using rear selection course needed in the art, polarization can be effectively improved
The generation efficiency of entangled photon pairs, reduce coincidence counting signal transacting difficulty, reduce quantum entanglement secrecy system noise and
Error, lifting polarization-entangled photon pair source is in the quantum communication technical field such as quantum key distribution, quantum repeater, quantum cryptography
In engineering application value.
Brief description of the drawings
Fig. 1 show the knot of the prior art based on the polarization-entangled photon pair source changed the mechanism under two class Spontaneous Parametrics
Structure schematic diagram；
Fig. 2 show the structural representation of the polarization-entangled photon pair source of the present invention；
Fig. 3 show the photon of the present invention to caused principle schematic；
Fig. 4 show principle schematic caused by the polarization-entangled state of the present invention；
Fig. 5 show the change of photon that embodiment provides to wavelength with polarization cycle.
In figure, the title corresponding to each mark is respectively：1. lithium niobate crystal chip；2. period polarized structure；3-1. vertical bar
Optical waveguide；3-2. tapered optical waveguides；4. vertical polarization photon pair；5. beam splitter；I. period polarized structure；II. cycle pole
Change structure；6. wavelength division multiplexer；7-1. single-photon detector；7-2. single-photon detector；11. photon 11；12. photon 12；21.
Photon 21；22. photon 22.
Embodiment
Understand for the ease of those of ordinary skill in the art and implement the present invention, below in conjunction with the accompanying drawings and embodiment is to this hair
It is bright to be described in further detail, it will be appreciated that embodiment described herein is merely to illustrate and explain the present invention, and is not had to
It is of the invention in limiting.
3-1, tapered optical waveguide 3-2, period polarized structure I, period polarized structure I I, wavelength division multiplexer 6, single-photon detecting
Survey device 7-1, single-photon detector 7-2.
Lithium niobate crystal chip 1 is optical grade lithium niobate body material wafers, and wafer thickness is 0.1mm to 1mm.For the ease of realizing
The preparation of period polarized structure, the crystal of lithium niobate crystal chip 1 tangentially cuts Y biographies using Z or Z cuts X and passed.
Vertical bar optical waveguide 3-1 be titanium spread optical waveguide, be made in lithium niobate crystal chip 1, waveguide length in 10mm extremely
60mm, for making vertical bar optical waveguide 3-1 titanium bar width at 5 to 7 μm.
Tapered optical waveguide 3-2 is that titanium spreads optical waveguide, is made in lithium niobate crystal chip 1, tapered optical waveguide 3-2's
Length is linearly changed to vertical bar optics ripple from 1 μm in 10mm to 20mm, the titanium bar width for making tapered optical waveguide 3-2
Lead 3-1 titanium bar width.Tapered optical waveguide 3-2 serves the effect of patten transformation, to realize the mould of the photon of pump light source
Matched well under formula and Spontaneous Parametric between the pattern of photon pair caused by transformation mechanism.
Based on the photon changed the mechanism under Spontaneous Parametric to resulting from period polarized vertical bar optical waveguide 3-1.This hair
It is bright that using being changed the mechanism under two class Spontaneous Parametrics, that is, one pump light photon in TE polarization states can produce a photon pair,
One of them is the photon of TE polarization states, and another is the photon of TM polarization states.Transformation mechanism will under efficient Spontaneous Parametric
Conservation of energy condition will not only be met between pump light photon, TE polarization states photon and TM polarization state photons by askingAlso the conservation of momentum, i.e. quasi-phase matched condition β are metp=βTE+βTM+2π/Λ.In quasi- phase
In matching condition, Λ represents the polarization cycle of period polarized optical waveguide.For different polarization cycle Λ, when meeting that energy keeps
Constant condition and quasi-phase matched condition, then it can obtain in different wave length, the photon of different polarization states.
In the present invention, period polarized vertical bar optical waveguide 3-1 includes two polarization cycles, Λ1And Λ2, correspond to respectively
Period polarized structure I and period polarized structure I I, and polarization cycle Λ1With polarization cycle Λ20.5 μm to 1.0 μm of difference.
Photon caused by period polarized structure I to including：
● photon 11 (TE polarization states, wavelength λ1)；
● photon 12 (TM polarization states, wavelength λ2)。
Photon caused by period polarized structure I I to including：
● photon 21 (TE polarization states, wavelength λ2),
● photon 22 (TM polarization states, wavelength λ1)。
Therefore, wavelength λ1Photon include photon 11 and photon 22, wavelength λ2Photon include photon 12 and photon
21。
Fig. 5 show schematic diagram of the photon corresponding to different polarization cycles to wavelength, and wherein slope is positive curve
Represent that the wavelength of the photon in TE polarization states represents inclined in TM with polarization cycle Λ variation tendency, slope for negative curve
The wavelength of the photon of polarization state with polarization cycle Λ variation tendency.By taking schematic diagram shown in Fig. 5 as an example, as polarization cycle Λ1For
At 9.28 μm, the wavelength of photon 11 is 1546nm, and photon 12 is 1575nm.As polarization cycle Λ2For 9.36 μm when, the wavelength of photon 21
For 1575nm, photon 22 is 1546nm.In this two groups of photons pair, photon 11 and photon 21 are in TE polarization states, the He of photon 12
Photon 22 is in TM polarization states.
The above results arrange as shown in table 1：
Caused photon pair, i.e. photon 11 and photon 12, photon 21 and photon 22, ripple is entered by fiber coupling mode
The input port of division multiplexer 6.Wavelength division multiplexer includes λ1And λ2Two wavelength channels, the wavelength of each passage are by scope
± 6.5nm, therefore caused two groups of photons are to the λ that will pass through respectively1Passage and λ2Passage.
In the output port λ of wavelength division multiplexer 61, resulting photon is：
● photon 11 (TE polarization states, results from period polarized structure I)
● photon 22 (TM polarization states, results from period polarized structure I I)
In the output port λ of wavelength division multiplexer 62, resulting photon is：
● photon 12 (TM polarization states, results from period polarized structure I)
● photon 21 (TE polarization states, results from period polarized structure I I)
As the output port λ of wavelength division multiplexer1, output port λ2Respectively with single-photon detector 7-1, single-photon detector
When 7-2 is connected and carried out coincidence counting measurement, the output port λ of wavelength division multiplexer 6 is connected1Single-photon detector 7-1 by nothing
It is photon 11 or photon 22 that method, which tells counted photon, likewise, the output port λ of connection wavelength division multiplexer 62List
It is photon 12 or photon 21 that photon detector 7-2, which will be unable to tell counted photon,.
As can be seen here, entangled photon pairs source structure of the present invention, without using rear selection course of the prior art
The generation of polarization-entangled state can be achieved, that is, when arriving at single-photon detector 7-1 and 7-2, photon has been located to 11,22,12,21
In polarization-entangled stateWherein：
●|H(λ1, Λ1)>Representing photon 11, (TE polarization states, wavelength is λ1, result from period polarized structure I)
●|V(λ1, Λ2)>Representing photon 22, (TM polarization states, wavelength is λ1, result from period polarized structure I I)
●|V(λ2, Λ1)>Representing photon 12, (TM polarization states, wavelength is λ2, result from period polarized structure I)
●|H(λ2, Λ2)>Representing photon 22, (TE polarization states, wavelength is λ2, result from period polarized structure I I)
Described above is only the preferred embodiment of the present invention, it is noted that for the common skill of the art
For art personnel, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as protection scope of the present invention.
Claims (6)
1. the polarization-entangled photon pair source selected after a kind of nothing, including：Lithium niobate crystal chip (1), vertical bar optical waveguide (3-1), cone
Shape optical waveguide (3-2), period polarized structure I, period polarized structure I I, wavelength division multiplexer (6).
2. the polarization-entangled photon pair source selected after a kind of nothing according to claim 1, it is characterised in that the lithium niobate
Chip (1) is optical grade lithium niobate body material wafers, and crystal tangentially cuts Y biographies for Z or Z cuts X biographies, and thickness is 0.1mm to 1mm.
3. the polarization-entangled photon pair source selected after a kind of nothing according to claim 1, it is characterised in that the vertical bar light
It is that titanium spreads optical waveguide to learn waveguide (3-1), is made in lithium niobate crystal chip (1), and waveguide length is straight in 10mm to 60mm, making
The titanium bar width of bar optical waveguide (3-1) is at 5 to 7 μm.
4. the polarization-entangled photon pair source selected after a kind of nothing according to claim 1, it is characterised in that the cone of light
It is that titanium spreads optical waveguide to learn waveguide (3-2), is made in lithium niobate crystal chip (1), the length of the tapered optical waveguide (3-2)
In 10mm to 20mm, the titanium bar width for making tapered optical waveguide (3-2) is linearly changed to vertical bar optical waveguide (3- from 2 μm
1) titanium bar width.
5. the polarization-entangled photon pair source selected after a kind of nothing according to claim 1, it is characterised in that the cycle pole
Change structure I and period polarized structure I I is made in vertical bar optical waveguide (3-1), the polarization cycle Λ of period polarized structure I1With
Period polarized structure I I polarization cycle Λ2Differ as 0.5 μm to 1 μm.Photon centering, photon caused by period polarized structure I
11 be TE polarization states, wavelength λ1, photon 12 is TM polarization states, wavelength λ2.Photon centering caused by period polarized structure I I,
Photon 21 is TE polarization states, wavelength λ2, photon 22 is TM polarization states, wavelength λ1。
6. the polarization-entangled photon pair source selected after a kind of nothing according to claim 1, it is characterised in that the wavelength-division is answered
λ is included with device (6)1And λ2Two wavelength channels, for two groups of photons caused by general to being separated by wavelength.In wavelength division multiplexer
(6) output port λ1With output port λ2, photon is in polarization-entangled state to 11 and 22,12 and 21, without being selected after use
Process is that the generation of polarization-entangled state can be achieved.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761958A (en) * | 2018-04-18 | 2018-11-06 | 中国地质大学（武汉） | It is a kind of generate in infrared Entangled State photon optical waveguide structure and its method |
| CN109976066A (en) * | 2019-04-04 | 2019-07-05 | 山东大学 | A kind of polarization-entangled source system of nondegenerate using periodically poled lithium niobate thin-film waveguide and its working method |
| CN111443548A (en) * | 2020-04-20 | 2020-07-24 | 上海交通大学 | Nonlinear photonic crystal and two-photon frequency and path super-entanglement generation method thereof |
| CN113253538A (en) * | 2021-01-08 | 2021-08-13 | 南京大学 | Wide-frequency tuning path entanglement and frequency entanglement chip based on Mach-Zehnder interferometer |
| CN115390335A (en) * | 2022-11-01 | 2022-11-25 | 济南量子技术研究院 | Compensation device of quantum entanglement source |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108761958A (en) * | 2018-04-18 | 2018-11-06 | 中国地质大学（武汉） | It is a kind of generate in infrared Entangled State photon optical waveguide structure and its method |
| CN109976066A (en) * | 2019-04-04 | 2019-07-05 | 山东大学 | A kind of polarization-entangled source system of nondegenerate using periodically poled lithium niobate thin-film waveguide and its working method |
| CN109976066B (en) * | 2019-04-04 | 2020-06-09 | 山东大学 | Nondegenerate polarization entanglement source system utilizing periodically polarized lithium niobate thin film waveguide and working method thereof |
| CN111443548A (en) * | 2020-04-20 | 2020-07-24 | 上海交通大学 | Nonlinear photonic crystal and two-photon frequency and path super-entanglement generation method thereof |
| CN111443548B (en) * | 2020-04-20 | 2021-05-28 | 上海交通大学 | Nonlinear photonic crystal and two-photon frequency and path super-entanglement generation method thereof |
| CN113253538A (en) * | 2021-01-08 | 2021-08-13 | 南京大学 | Wide-frequency tuning path entanglement and frequency entanglement chip based on Mach-Zehnder interferometer |
| CN115390335A (en) * | 2022-11-01 | 2022-11-25 | 济南量子技术研究院 | Compensation device of quantum entanglement source |
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