CN210005836U - Compact single crystal thin cavity and entangled photon source system using the same - Google Patents
Compact single crystal thin cavity and entangled photon source system using the same Download PDFInfo
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Abstract
The utility model relates to a laser technology, nonlinear optics physics technique, quantum optics and quantum communication technical field especially relate to the thin chamber of compact monocrystal and the entanglement photon source system who utilizes this thin chamber, the free spectral range FSR and the linewidth Δ υ in the thin chamber of compact monocrystal satisfy formula down respectively:
and
the utility model discloses an adopt very thin nonlinear crystal single chamber structure, have small and control simply to through selecting suitable chamber length l and coating film parameter, wherein the transmittance T is adjusted to the coating film parameter, only need satisfy formula (2) can be free the required photon line width of design. And because the resonance effect of the compact single crystal thin cavity greatly enhances the spectral brightness of the generated photons relative to the spectral brightness in a single pass, the theoretical calculation surface shows that the enhancement factor of the spectral brightness of the photon pair generated by the compact single crystal thin cavity relative to the normal brightness in the single pass is proportional to the square of the fineness (F) of the compact single crystal thin cavity2)。
Description
Technical Field
The utility model relates to a laser technology, nonlinear optics physics technique, quantum optics and quantum communication technical field especially relate to kinds of compact single crystal thin chambers and the entanglement photon source system who utilizes this thin chamber.
Background
In addition, , the remote quantum communication needs to use a quantum repeater, the core of the quantum repeater is a quantum memory, and the effective photon line width of the quantum memory is within GHz, so the photon pair with narrow line width and high brightness is an essential key component for realizing the remote quantum communication.
SUMMERY OF THE UTILITY MODEL
In order to overcome the deficiencies in the prior art, the utility model provides a compact single crystal thin cavity and an entanglement photon source system using the same.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the compact single crystal thin cavity comprises a cavity body and a single crystal arranged in the cavity body, and the free spectral path FSR and the line width Delnu of the compact single crystal thin cavity respectively satisfy the following formula of :
where l is the cavity length of the compact single crystal thin cavity and n isyAnd nzRespectively, the refractive indices of the crystal in the y-axis and z-axis, where Fa＝2π/γa(a＝y,z)，γyAnd gammazRepresents the dissipation of photons in the y-axis and z-axis of the cavity, where gammaaConsists of transmittance T of output end face coating film and absorption and dissipation in the cavity, and the absorption loss of the crystal in the communication waveband can be ignored, so that gamma can be obtaineda＝TaAnd c is the speed of light, constant.
, the compact single crystal thin cavity output is divided into vertically polarized photons and horizontally polarized photons by a polarization beam splitter, the vertically polarized photons are set as signal photons, the horizontally polarized photons are set as idler photons, and the cluster frequency interval of the vertically polarized photons and the horizontally polarized photons is defined as:
the spontaneous radiation bandwidth of the crystal is determined by a phase matching function, namely the phase matching function is set as follows:
sin c2(Δkl/2) (4)
assuming that the full width at half maximum of the phase matching function is Δ Ω, the compact single crystal thin cavity satisfies:
ΔΩc＞ΔΩ (5)
where Δ k is the phase mismatch, and Δ k ═ kp-ks-ki+2 π/Λ, where kp、ks、kiRespectively representing the wave vectors, FSR, of the pump, signal and idler photonssAnd FSRiRepresenting the free spectral paths, k, of signal and idler photons, respectivelyp、ks、kiAll conform to formula kb＝2πnb/λb(b ═ p, s, i) where n isbIn order to correspond to the refractive index of light, λbIn order to correspond to the wavelength of light, lambda is the polarization period of the single crystal, pump light and signal photons are set to move along the y axis of the optical axis of the crystal, idler photons move along the Z axis of the optical axis of the crystal, the y axis of the optical axis of the crystal is the length direction of the crystal, and the Z axis is the height direction of the crystal after being placed.
, the single crystal is phase-matched type periodically poled potassium hydrogen phosphate PPKTP.
, the compact single crystal thin cavity is disposed within a crystal temperature controlled furnace.
, the single crystal has an antireflection film for pump light and an optical reflection film for wavelength beam at the entrance end face and an antireflection film for pump light and a partial reflection film for wavelength beam at the exit end face.
entangled photon source system using the compact single crystal thin cavity comprises a light path sequentially arranged
The pump Laser is used for emitting pump light with set wavelength and outputting Laser line width less than 10 MHz;
optical sheet module for adjusting the polarization of pump light and reducing the diameter of light spot;
the dichroic mirror DM is used for separating the pumping wavelength from the th wavelength, reflecting the pumping light to be input into the thin crystal cavity when generating photons, and transmitting the detection laser with the th wavelength when representing the parameters of the cavity;
the second optical sheet component is used for integrating the output photon pair to the set light spot size;
the light splitting transmission component is used for filtering the pump laser and splitting the photon pair with orthogonal polarization into vertically polarized photons and horizontally polarized photons for output;
the two unequal-arm optical fiber interferometers are respectively used for carrying out two-photon Franson interferometry on the generated vertically polarized photons and the generated horizontally polarized photons;
the coincidence counting assembly is used for carrying out time energy entanglement measurement on the two photons output by the two unequal-arm optical fiber interferometers;
the compact single crystal thin cavity is arranged on the light path between the dichroic mirror DM and the second optical sheet assembly.
, the optical sheet module is sequentially arranged on the wave sheet unit and the lens unit on the optical path.
, the light splitting and transmitting assembly includes a second lens unit, a long pass filter LPF, a polarization beam splitter PBS and two optical fiber collimators correspondingly arranged on the two light paths split by the polarization beam splitter PBS.
, the coincidence counting component comprises 2 superconductive single-photon detectors SNSPD which respectively and correspondingly receive photon signals at the output ends of the two unequal-arm optical fiber interferometers, and the output photons of the 2 superconductive single-photon detectors SNSPD are input into the coincidence counting instrument.
A system comprises a correction assembly, the correction assembly comprises a rapid probe PD, an oscilloscope OSC, a detection Laser, a pump Laser, a optical sheet assembly, a dichroic mirror DM, a second optical sheet assembly, a half-wave plate HWP2 and a polarization beam splitter PBS, the pump Laser, the oscilloscope OSC and the detection Laser are sequentially arranged, the compact single crystal thin cavity is arranged on a light path between the dichroic mirror DM and the second optical sheet assembly, the rapid probe PD is arranged on the rear end face of the dichroic mirror DM and receives wavelength light beams, the oscilloscope is used for receiving signals obtained by the rapid probe PD and displaying states, and detection light emitted by the detection Laser reversely passes through the second optical sheet assembly from output ports of the light splitting transmission assembly and enters the compact single crystal thin cavity.
The utility model has the advantages that:
(1) the utility model discloses a very thin nonlinear crystal list chamber structure has small and controls simply to through selecting suitable chamber length l and coating film parameter, wherein the transmittance T is adjusted to the coating film parameter, only need satisfy formula (2) can be free the required photon line width of design. And because the resonance effect of the compact single crystal thin cavity greatly enhances the spectral brightness of the generated photons relative to the spectral brightness in a single pass, the theoretical calculation surface shows that the enhancement factor of the spectral brightness of the photon pair generated by the compact single crystal thin cavity relative to the normal brightness in the single pass is proportional to the square of the fineness (F) of the compact single crystal thin cavity2)。
(2) The compact single crystal thin cavity generates a th wavelength light beam, and due to the resonance effect of the compact single crystal thin cavity, the pump laser generates spontaneous parameters in the compact single crystal thin cavity to generate photon pairs of vertically polarized photons and horizontally polarized photons with wavelength in a down-conversion mode, and the generated photon pairs are reflected back and forth in the cavity to realize resonance enhanced output.
(3) The pump laser passes through the thin cavity formed by pieces of two-type phase matching PPKTP crystals once, because of the spontaneous parameter down-conversion process, pairs of photons with orthogonal polarization are generated in the cavity at the same time, the generated pairs of photons can be output from the rear end face of the thin cavity by designing the coating parameters of the crystals, and only the photons resonant with the thin cavity can be output from the thin cavity.
(4) The utility model discloses in use crystal control by temperature change stove, make the crystal keep in the temperature range who sets for to influence the refracting index of monocrystal and change the phase place matching condition.
(5) The utility model discloses thereby the difference of the setting of well single crystal both ends membrane can be adjusted linewidth delta upsilona。
(6) The utility model provides an entanglement photon source system carries out two-photon Franson interferometry respectively through two unequal arm interferometers with vertical polarization photon and horizontal polarization photon thereby characterization time energy entanglement characteristic, thereby the vertical polarization photon and the horizontal polarization photon of production are respectively through the unequal arm interferometer of two arm difference delay appearance, select after going on the time window that two-photon accords with like this, accord with the measurement on middle window, it sends the time delay of the short arm and the long arm of unequal arm interferometer simultaneously to vertical polarization photon and horizontal polarization photon and leads when , can not distinguish in the window of being accorded with, therefore the two-photon time energy entanglement attitude that produces can be write into
(7) The wave plate unit adjusts the pump light to be horizontally polarized, and the th lens unit is used for reducing the diameter of the light spot.
(8) The second lens unit is used for enabling the output photons to reach the set light spot size in a whole mode, the LPF is used for filtering pump laser, the polarization beam splitter enables the output photons to be divided into vertical polarization photons and horizontal polarization photons, and the vertical polarization photons and the horizontal polarization photons are transmitted to the corresponding unequal-arm optical fiber interferometer through the optical fibers after passing through the corresponding optical fiber collimators respectively.
(9) The utility model discloses a quick probe PD, oscilloscope OSC, detect the laser instrument and correct the effect in the thin chamber of compact monocrystal, can follow entire system and demolish after finishing detecting, owing to can produce horizontal polarization photon and vertical polarization photon behind the thin chamber of compact monocrystal, in order to use quick probe PD and oscilloscope OSC, replace half waveplate HWP2 with the long pass filter LPF, switch to horizontal polarization photon and vertical polarization photon detects, after detecting kind of photon, rotate half waveplate HWP2 90 degrees and be obtained the state that detects another kind of photon.
Drawings
Fig. 1 is a schematic diagram of the optical path structure of the entangled photon source system of the present invention.
Fig. 2 is a representation structure diagram of the chamber of the present invention.
Fig. 3 shows the transmission spectra of the H-polarization and V-polarization of a single cavity crystal used in the present invention.
Fig. 4 is a graph of the single-pass count and coincidence count of photons with pump power in the present invention.
Fig. 5 is a graph of the ratio CAR of coincidence counts to dark coincidences characterizing photons versus power.
Fig. 6 is a two-photon Franson interference curve of time-energy entangled photons according to an embodiment of the present invention.
Detailed Description
Example 1
As shown in fig. 1-2, the compact single crystal thin cavity includes a cavity and a crystal, and the compact single crystal thin cavity output is split into vertically polarized photons and horizontally polarized photons by a polarizing beam splitter. The vertically polarized photons are set as signal photons and the horizontally polarized photons are set as idler photons. The single crystal is periodically polarized potassium hydrogen phosphate PPKTP with the phase matching of the two types, and the compact single crystal thin cavity is arranged in the crystal temperature control furnace. Wherein the working temperature range of the temperature control furnace is 15 to 70 ℃, and the temperature control precision is 2 mK.
In the embodiment, the pump light with the wavelengths of 780nm and 1560nm and the partial reflection film with the wavelength of are taken as examples, namely, the film at the crystal inlet end face comprises the antireflection film with the wavelength of 780nm and the total reflection film with the wavelength of 1560nm, the film at the outlet end face comprises the antireflection film with the wavelength of 780nm and the partial reflection film with the wavelength of 1560nm, the reflectivity of the partial reflection film is 95 percent, namely, the transmittance is 5 percent, and the cavity length l of the compact single crystal thin cavity is 0.85 mm.
The free spectral range FSR and the line width Deltatnu of the compact monocrystal thin cavity respectively satisfy the following formulas of :
where l is the cavity length of the compact single crystal thin cavity and n isyAnd nzRespectively, the refractive indices of the crystal in the y-axis and z-axis, where Fa＝2π/γa(a＝y,z)，γyAnd gammazRepresents the dissipation of photons in the y-axis and z-axis of the cavity, where gammaaConsists of transmittance T of output end face coating film and absorption and dissipation in the cavity, and the absorption loss of the crystal in the communication waveband can be ignored, so that gamma can be obtaineda＝TaAnd c is the speed of light, constant.
Under the premise of determining the length and coating parameters of a compact single crystal thin cavity, the next step is to determine whether the generated photon pair is in the condition of single longitudinal mode operation, for the intracavity parameters of the two types, the single longitudinal mode operation needs to meet the requirement that the cluster frequency interval of the vertical polarization photon and the horizontal polarization photon of radiation is greater than the half width of the spontaneous radiation gain of the crystal, and specifically, the cluster frequency interval of the vertical polarization photon and the horizontal polarization photon is defined as:
the spontaneous emission bandwidth of the crystal is determined by the following phase matching function:
sin c2(Δkl/2) (4)
assuming that the full width at half maximum of the phase matching function is Δ Ω, the compact single crystal thin cavity satisfies:
ΔΩc＞ΔΩ (5)
where Δ k is the phase mismatch, and Δ k ═ kp-ks-ki+2 π/Λ, where kp、ks、kiRespectively representing the wave vectors, FSR, of pump light, vertically polarized photons, horizontally polarized photonssAnd FSRiRespectively representing signalsFree spectral path, k, of photons and idler photonsp、ks、kiAll conform to formula kb＝2πnb/λb(b ═ p, s, i) where n isbIn order to correspond to the refractive index of light, λbΛ is the polarization period of the single crystal for the wavelength of light. The pump light and the signal photon move along the y axis of the crystal optical axis, the idler photon moves along the Z axis of the crystal optical axis, the y axis of the crystal optical axis is the length direction of the crystal, and the Z axis is the height direction of the crystal after being placed. In the example of the present invention, the frequency cluster interval of the signal photons and the idler photons is 1075.1GHz, which is greater than the spontaneous emission bandwidth 914GHz of the crystal, and thus, the single longitudinal mode operation condition can be satisfied.
The scheme adopts a very thin nonlinear crystal single-cavity structure, has small volume and simple control, and can freely design the required photon line width by selecting proper cavity length and coating parameters. In addition, the core of the design scheme is that the spacing of the frequency clusters of the spontaneous parameter photons is larger than the gain line width of the spontaneous radiation of the crystal, so that the single longitudinal mode output can be ensured. The scheme has the advantages of small volume, simple operation, high spectral brightness, high entanglement quality and freely designed photon line width, and is suitable for related application of a plurality of quantum information technologies.
Example 2
As shown in fig. 1, entangled photon source systems using the compact single crystal thin cavity described in embodiment 1 include a pump Laser, a th optical sheet assembly, a dichroic mirror DM, a second optical sheet assembly, a light splitting and transmitting assembly, two unequal arm fiber interferometers, and a coincidence counting assembly, which are sequentially disposed on an optical path.
Wherein the pump Laser is used for emitting pump light with set wavelength, and the output Laser line width is less than 10 MHz; thereby ensuring a narrow line width, and in this embodiment, pump light having a wavelength of 780nm is selected.
The th optical chip component is used for adjusting polarization of pump light and reducing the diameter of a light spot, the th optical chip component is sequentially arranged on a wave plate unit and a th lens unit on a light path, concretely, the th optical chip component comprises a half-wave plate HWP1 and a quarter-wave plate QWP which are sequentially arranged on the light path, and the pump light is adjusted to a horizontal polarization state, so that a spontaneous parameter down-conversion process of the periodically polarized potassium hydrogen oxygen phosphate PPKTP is met, the th lens unit comprises a th lens L1 and a second lens L2 which are sequentially arranged, and the th lens L1 and the second lens L2 are 780nm lenses, and the 780nm pump light is adjusted to be horizontally polarized through the wave plate unit and then is sequentially reduced to a set size through the actions of a lens L1 and a second lens L2.
The dichroscope DM inputs the adjusted pump light into the compact monocrystal thin cavity, and when the cavity is characterized, the detection laser of the reverse input cavity is transmitted from the cavity and then is detected by the rapid probe from the transmission of the dichroscope DM.
The compact single crystal thin cavity is arranged on an optical path between the dichroic mirror DM and the second optical sheet component, the compact single crystal thin cavity generates a th wavelength light beam, the th wavelength in the embodiment is 1560 nm.
The second optical sheet assembly comprises a third lens L3 and a fourth lens L4 which are sequentially arranged on the optical path and used for integrating the output photon pair to the set spot size, so that the output photon pair can be efficiently coupled into a subsequent single-mode fiber SMF.
The optical splitting transmission assembly comprises a second lens unit, a long pass filter LPF and a polarization beam splitter PBS which are sequentially arranged on an optical path, and further comprises a optical fiber collimator FC1 and a second optical fiber collimator FC2 which are correspondingly arranged on two optical paths split by the polarization beam splitter PBS, wherein the optical fiber collimator FC1 and the second optical fiber collimator FC2 are used for effectively collecting shaped photon pairs, namely the shaped photon pairs are output to a corresponding single mode optical fiber SMF through the optical fiber collimator FC1 and the second optical fiber collimator FC2 for subsequent interference and measurement representation.
The two unequal-arm optical fiber interferometers are respectively an th unequal-arm optical fiber interferometer UMI1 and a second unequal-arm optical fiber interferometer UMI2, the coincidence counting assembly comprises 2 superconducting single-photon detectors SNSPD which respectively and correspondingly receive photon signals at the output ends of the th unequal-arm optical fiber interferometer UMI1 and the second unequal-arm optical fiber interferometer UMI2, and output photons of the 2 superconducting single-photon detectors SNSPD are input into the coincidence counting assembly&The anisoarmed optical fiber interferometer UMI1 and the second anisoarmed optical fiber interferometer UMI2 are used for the two-photon nson interference measurement of the generated narrow-linewidth photon pair, the generated horizontal polarized photon and the generated vertical polarized photon respectively pass through the anisoarmed optical fiber interferometer UMI1 and the second anisoarmed optical fiber interferometer UMI2 which are two-arm differential delay samples, so that the selection is carried out after the time window of two-photon coincidence, the coincidence measurement is carried out on the middle window, when the pair of photons simultaneously pass through the anisoarmed differential delay sample, the UMI1 and the UMI2 of the second anisoarmed optical fiber interferometer, the short-arm and the long-arm delay 38 of the anisoarmed optical fiber interferometer UMI1 and the second anisoarmed optical fiber interferometer 2 are coincident, the short-arm and the long-arm delay 38 can be generated, and the time entanglement measurement can be carried out in the two-arm time window, so that the pair of photons can be distinguished into the time entanglement measurement in the two-arm delay window, and the two-arm entanglement measurement can be carried out
Specifically, as shown in fig. 2, the system comprises a correction assembly, wherein the correction assembly comprises a fast probe PD, an oscilloscope OSC and a detection Laser, and further comprises a pump Laser, a optical sheet assembly, a dichroic mirror DM, a second optical sheet assembly, a half-wave plate HWP2 and a polarization beam splitter PBS which are arranged in sequence, the fast probe PD is arranged on the optical path between the dichroic mirror DM and the second optical sheet assembly, the fast probe PD is arranged on the rear end face of the dichroic mirror DM to receive a wavelength beam, the oscilloscope OSC is used for receiving signals acquired by the fast probe PD and displaying the status, detection light emitted by the detection Laser enters the compact single crystal thin film cavity from output ports of the optical splitter transmission assembly through the second optical sheet assembly in the reverse direction, the detection light beam passes through a polarization optical fiber grating LPF 3532 after the photon spectrum of photons of the photon beam passes through a polarization beam grating H, the photon spectrum counter assembly, the photon spectrum counter module is used for detecting the photon width of the reflected light beam passing through the photon spectrum counter 35p 3524, and the photon spectrum counter module, the photon spectrum counter module is used for detecting the photon spectrum counter after the photon spectrum counter curve of the photon spectrum counter is changed from the photon spectrum counter after the photon wavelength of the photon beam cd 2, the photon beam cd counter spectrum counter after the photon counter spectrum counter is detected by the photon counter spectrum counter.
In order to characterize the quality of the generated entanglement light source, the following parameters of the entanglement source need to be measured.
First, the relationship between the photon generation rate and the pump power needs to be measured, as shown in FIG. 4, the photon generation rate in this example can reach 2 × 105. It is then necessary to characterize the ratio CAR of the coincidence count to the dark coincidence of the photons as a function of power, as shown in FIG. 5We have found in this example that the ratio CAR can reach 1400 at 100mW pumping, finally at a suitable power, it is necessary to characterize the temporal energy entanglement characteristics of the entangled photons, which are characterized by measuring the Franson interference curve, fixing of which at a phase of 0 or pi/4, varying the phases of the other unequal-arm interferometers and measuring the composite count to obtain two sets of interference curves, as shown in figure 6.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, and all modifications, equivalents, improvements and the like that are made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. The compact single crystal thin cavity is characterized by comprising a cavity body and a single crystal arranged in the cavity body, and the free spectral path FSR and the line width Delnu of the compact single crystal thin cavity respectively satisfy the following formulas of :
where l is the cavity length of the compact single crystal thin cavity and n isyAnd nzRespectively, the refractive indices of the crystal in the y-axis and z-axis, where Fa＝2π/γa(a＝y,z)，γyAnd gammazRepresents the dissipation of photons in the y-axis and z-axis of the cavity, where gammaaConsists of transmittance T of output end face coating film and absorption and dissipation in the cavity, and the absorption loss of the crystal in the communication waveband can be ignored, so that gamma can be obtaineda＝TaAnd c is the speed of light, constant.
2. The compact single crystal thin cavity of claim 1, wherein the compact single crystal thin cavity output is divided into vertically polarized photons and horizontally polarized photons by a polarizing beam splitter, the vertically polarized photons are set as signal photons, the horizontally polarized photons are idler photons, and the cluster frequency spacing of the vertically polarized photons and the horizontally polarized photons is defined as:
the spontaneous radiation bandwidth of the crystal is determined by a phase matching function, namely the phase matching function is set as follows:
sin c2(Δkl/2) (4)
assuming that the full width at half maximum of the phase matching function is Δ Ω, the compact single crystal thin cavity satisfies:
ΔΩc＞ΔΩ (5)
where Δ k is the phase mismatch, and Δ k ═ kp-ks-ki+2 π/Λ, where kp、ks、kiRespectively representing the wave vectors, FSR, of the pump, signal and idler photonssAnd FSRiRepresenting the free spectral paths, k, of signal and idler photons, respectivelyp、ks、kiAll conform to formula kb＝2πnb/λb(b ═ p, s, i) where n isbIn order to correspond to the refractive index of light, λbAnd in order to correspond to the wavelength of light, Λ is the polarization period of the single crystal, the pump light and the signal photon move along the y axis of the optical axis of the crystal, the idler photon moves along the Z axis of the optical axis of the crystal, the y axis of the optical axis of the crystal is the length direction of the crystal, and the Z axis is the height direction of the crystal after being placed.
3. The compact single crystal thin cavity of claim 1, wherein said single crystal is phase matched two-type periodically poled potassium hydrogen phosphate PPKTP.
4. The compact single crystal thin chamber of claim 1, wherein the compact single crystal thin chamber is disposed within a crystal temperature controlled furnace.
5. The compact single crystal thin cavity of claim 1, wherein the single crystal inlet facet is provided with an antireflection film for pump light and an optical reflection film for wavelength beam, and the outlet facet is provided with an antireflection film for pump light and a partial reflection film for wavelength beam.
6, entangled photon source system using the compact single crystal thin cavity of any of claims 1-5 , comprising a plurality of optical detectors sequentially arranged in the optical path
The pump Laser is used for emitting pump light with set wavelength and outputting Laser line width less than 10 MHz;
optical sheet module for adjusting the polarization of pump light and reducing the diameter of light spot;
the dichroic mirror DM reflects and inputs the pump light into the compact single crystal thin cavity, allows -wavelength light to be highly transmitted, and separates the pump light from -wavelength light for parameter measurement of the single crystal thin cavity;
the second optical sheet component is used for integrating the output photon pair to the set light spot size;
the light splitting transmission component is used for filtering the pump laser and splitting the photon pair with orthogonal polarization into vertically polarized photons and horizontally polarized photons for output;
the two unequal-arm optical fiber interferometers are respectively used for carrying out two-photon Franson interferometry on the generated vertically polarized photons and the generated horizontally polarized photons;
the coincidence counting assembly is used for carrying out time energy entanglement measurement on the two photons output by the two unequal-arm optical fiber interferometers;
the compact single crystal thin cavity is arranged on the light path between the dichroic mirror DM and the second optical sheet assembly.
7. An entangled photon source system as claimed in claim 6 wherein the optical sheet assembly is sequentially disposed on the wave sheet unit and the lens unit in the optical path.
8. The entangled-photon source system as claimed in claim 6, wherein the light splitting and transmitting assembly comprises a second lens unit, a long pass filter LPF, a polarization beam splitter PBS, and two fiber collimators respectively disposed on two light paths split by the polarization beam splitter PBS.
9. The entanglement photon source system of claim 6, wherein the coincidence counting assembly comprises 2 superconducting single photon detectors (SNSPD) respectively receiving photon signals at output ends of the two unequal-arm fiber optic interferometers, and output photons of the 2 superconducting single photon detectors (SNSPD) are input into the coincidence counter.
10, A compact single crystal thin cavity entanglement photon source system using the thin cavity of any of claims 1-5, wherein the system comprises a calibration assembly, the calibration assembly comprises a fast probe PD, an oscilloscope OSC, a detection Laser, a pump Laser, a rd optical chip assembly, a dichroic mirror DM, a second optical chip assembly, a half-wave chip HWP2, and a polarization beam splitter PBS, the compact single crystal thin cavity is arranged on the optical path between the dichroic mirror DM and the second optical chip assembly, the fast probe PD is arranged on the rear end face of the dichroic mirror DM to receive the th wavelength light beam, the oscilloscope OSC is used for receiving signals obtained by the fast probe PD and displaying the state, and the detection light emitted by the detection Laser reversely passes through the second optical chip assembly from output ports of the optical splitter transmission assembly and enters the compact single crystal thin cavity.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110187586A (en) * | 2019-05-27 | 2019-08-30 | 青岛鲲腾量子应用技术有限公司 | The thin chamber of compact monocrystal and the entangled photons source system for using the thin chamber |
| RU2820883C1 (en) * | 2023-04-20 | 2024-06-11 | Открытое Акционерное Общество "Российские Железные Дороги" | Method of preparing entangled states of single-photon field and quantum memory for quantum repeaters |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110187586A (en) * | 2019-05-27 | 2019-08-30 | 青岛鲲腾量子应用技术有限公司 | The thin chamber of compact monocrystal and the entangled photons source system for using the thin chamber |
| RU2820883C1 (en) * | 2023-04-20 | 2024-06-11 | Открытое Акционерное Общество "Российские Железные Дороги" | Method of preparing entangled states of single-photon field and quantum memory for quantum repeaters |
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