CN214122643U - Two-photon polarization-path entangled quantum invisible state transfer experimental device - Google Patents
Two-photon polarization-path entangled quantum invisible state transfer experimental device Download PDFInfo
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Abstract
The utility model provides a stealthy biography attitude experimental apparatus of quantum that two photon polarization-route were entangled, wherein measure the Bell attitude and reappear the quantum attitude with the help of Alice end and Bob end respectively. The second polarization beam splitting unit and the third polarization beam splitting unit which have the same structure are arranged at the Alice end, the second polarization beam splitting unit is used for polarization beam splitting of the entangled photons, the entangled photons are subjected to transmission state modulation, the third polarization beam splitting unit is used for enabling the entangled photons to interfere, and interference results are detected so that complete Bell state measurement is achieved. By replacing part of the spatial light devices in the prior art with the second and third polarization beam splitting units, and optimizing the overall optical design accordingly, the cost can be reduced, and the debugging difficulty and the system performance stability can be improved.
Description
Technical Field
The utility model relates to a quantum information science technical field, in particular to stealthy biography attitude experimental apparatus of quantum that two-photon polarization-route were entangled.
Background
Since 1993, Bennett et al proposed the concept of quantum invisible transport states, and since then there have been different groups demonstrating quantum invisible transport experiments based on different material carriers. Since the photons are less affected by the environment, the Martini group in italy demonstrates the quantum stealth state experiment by using the polarization-path entanglement of the photons, and proves that the scheme is equivalent to the scheme proposed by Bennett et al, and the experimental optical path of the scheme is shown in fig. 1.
In the experimental optical path shown in fig. 1, pump light passes through the BBO crystal to generate down-converted entangled photons,
through calcite, photons of the H component enter 2 paths and are sent to Bob, and photons of the V component enter 1 path and are sent to Alice. The state of the photon pair at this time can be described as:
using a polarization controller acting on1And b1On the path photon, any state to be transmitted can be prepared. For polarization-path entanglement, the 4 orthogonal Bell basis vectors used are as follows:
compared with the quantum invisible state entangled by four-photon polarization, Alice in the scheme can complete Bell measurement.
However, the experimental optical paths in the prior art are all constructed by space optical devices, so that the cost is high, the debugging difficulty is high, and the system stability is low.
SUMMERY OF THE UTILITY MODEL
To this problem, the utility model provides a stealthy biography attitude experimental apparatus of quantum that two-photon polarization-route were entangled, wherein carried out the substitution design to partial space optical device to reduce the debugging degree of difficulty in reduce cost, and system performance is more stable.
Specifically, the two-photon polarization-path entangled quantum invisible state transfer experimental device can comprise an entanglement source, an Alice end and a Bob end;
the entanglement source is used for generating entangled photons;
the Bob end is used for receiving the first path of entangled photons and carrying out single photon detection on the first path of entangled photons to reproduce a quantum state;
the Alice end is used for receiving the second path of entangled photons and carrying out initial transmission state preparation and Bell state measurement on the second path of entangled photons; the method is characterized in that:
the Bob end comprises a first polarization beam splitting unit and a single photon detection module;
the first polarization beam splitting unit is arranged to polarizedly split the first path of entangled photons into a first component and a second component;
the single photon detection module is configured to perform single photon detection on the first component and the second component of the first path of entangled photons; and the number of the first and second groups,
the Alice terminal comprises a second polarization beam splitting unit, a first polarization control module, a third polarization beam splitting unit and a Bell state measuring module, wherein,
the second polarization beam splitting unit is arranged to polarizedly split the second path of entangled photons into first and second components and output the first and second components of the second path of entangled photons in parallel with each other;
the first polarization control module is arranged between the second polarization beam splitting unit and the third polarization beam splitting unit and is used for carrying out polarization state modulation on the first component and the second component of the second path of entangled photons to realize initial transmission state preparation;
the third polarization beam splitting unit is configured to receive the first and second components of the second path of entangled photons and deflect the first component of the second path of entangled photons in a direction so as to interfere with the second component of the second path of entangled photons on a polarization beam splitting surface to generate first and second interference signals;
the Bell state measurement module is configured to receive the first and second interference signals and perform single photon detection under four orthogonal Bell basis vectors to achieve Bell state measurements.
Further, the first polarization beam splitting unit comprises a polarization beam splitter, and the single photon detection module comprises a first single photon detection unit and a second single photon detection unit;
the first single-photon detection unit comprises a first coupler and a first single-photon detector, wherein the first coupler is used for collecting a first component of the first path of entangled photons and inputting the first component of the first path of entangled photons into the first single-photon detector through a transmission optical fiber;
the second single-photon detection unit comprises a second coupler and a second single-photon detector, wherein the second coupler is used for collecting a second component of the first path of entangled photons and inputting the second component of the first path of entangled photons into the second single-photon detector through a transmission optical fiber.
Further, the first polarization beam splitting unit includes an optical fiber type polarization maintaining polarization beam splitter; the single photon detection module comprises a first single photon detector and a second single photon detector; and the first single-photon detector and the second single-photon detector are respectively connected with two output ends of the optical fiber type polarization-maintaining polarization beam splitter through transmission optical fibers.
Further, the second polarization beam splitting unit includes a polarization beam splitter portion and a mirror portion integrated as one body, and a reflection surface of the mirror portion is parallel to a polarization beam splitting surface of the polarization beam splitter portion; and, the third polarization beam splitting unit includes a polarization beam splitter portion and a mirror portion integrated as one body, and a reflection surface of the mirror portion is parallel to a polarization beam splitting surface of the polarization beam splitter portion.
Further, the first polarization control module is further configured to flip one of the first and second components of the second path of entangled photons by 90 degrees. The first polarization control module may include a first polarization control unit for implementing 90-degree inversion of the polarization state, and a second polarization control unit for implementing preparation of the initial transmission state.
Optionally, the first polarization control unit comprises a polarization controller or a wave plate; the second polarization control unit includes a polarization controller or a wave plate.
Preferably, the first polarization control unit is a wave plate with a wavelength of 1/4; the second polarization control unit includes a quarter-wave plate and a half-wave plate.
Furthermore, the Bell state measuring module comprises a third polarization control unit, a fourth polarization beam splitting unit, a fourth polarization control unit, a fifth polarization beam splitting unit and third to sixth single photon detection units; the third polarization control unit is arranged for polarization control of the first interference signal; the fourth polarization beam splitting unit is arranged to receive the polarization-controlled first interference signal and to split its polarization into first and second components; the third and fourth single-photon detection units are respectively arranged for single-photon detection of the first and second components of the first interference signal; the fourth polarization control unit is configured to perform polarization control on the second interference signal; the fifth polarization beam splitting unit is arranged to receive the polarization-controlled second interference signal and to split its polarization into a third and a fourth component; the fifth and sixth single photon detection units are respectively arranged for single photon detection of the third and fourth quantums.
Still further, the third polarization control unit is configured to effect one of-45 degree and 45 degree polarization state rotation, and the fourth polarization control unit is configured to effect the other of-45 degree and 45 degree polarization state rotation.
Further, the third polarization control unit comprises a polarization controller or a wave plate, or is realized by rotating the optical axis alignment angle; and/or the fourth polarization control unit comprises a polarization controller or a wave plate, or is realized by rotating the optical axis alignment angle.
Furthermore, the fourth polarization beam splitting unit comprises a double-pigtail polarization beam splitting coupler, and the double-pigtail polarization beam splitting coupler is connected with the third and fourth single photon detection units through optical fibers; and/or the fifth polarization beam splitting unit comprises a double-pigtail polarization beam splitting coupler, and the double-pigtail polarization beam splitting coupler is connected with the fifth single photon detection unit and the sixth single photon detection unit through optical fibers.
Further, the quantum invisible state experimental device can also comprise a first light collecting unit and a second light collecting unit; wherein the first light collection unit comprises a first coupler and a first transmission fiber, the first coupler being configured to collect and couple the first path of entangled photons into the first transmission fiber for input to the Bob end; the second light collecting unit comprises a second coupler and a second transmission optical fiber, and the second coupler is configured to collect and couple the second path of entangled photons into the second transmission optical fiber to be input to the Alice terminal.
Preferably, the first transmission fiber is a single mode or polarization maintaining fiber; the second transmission fiber is a single mode or polarization maintaining fiber.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 illustrates a quantum invisible propagation experimental optical path of the prior art;
fig. 2 illustrates one embodiment of a two-photon polarization-path entangled quantum stealth state experimental device according to the present invention;
fig. 3 illustrates another embodiment of a two-photon polarization-path entangled quantum stealth state experimental device according to the present invention;
fig. 4 shows yet another embodiment of a two-photon polarization-path entangled quantum stealth state experimental device according to the present invention.
Detailed Description
Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following examples are provided by way of illustration in order to fully convey the spirit of the invention to those skilled in the art. Accordingly, the present invention is not limited to the embodiments disclosed herein.
Fig. 2 shows an embodiment of a two-photon polarization-path entangled quantum invisible state transfer experimental apparatus according to the present invention.
The utility model discloses in, stealthy biography attitude experimental apparatus of quantum can be held including entanglement source, Alice and Bob.
The entanglement source is used to generate polarization-entangled photons, which may be expressed, for example, as
And the Bob end is used for receiving the first path of the entangled photons and carrying out single photon detection on the first path of the entangled photons to reproduce the quantum state.
Specifically, the Bob end may include a first polarization beam splitting unit and a single photon detection module.
The first polarization beam splitting unit is used for carrying out polarization beam splitting on the first path of entangled photons to form a first component and a second component so as to carry out single photon detection by the single photon detection module.
As an example, the single photon detection module may comprise a first single photon detection unit and a second single photon detection unit for receiving and performing single photon detection of the first and second components, respectively.
And the Alice terminal is used for receiving the second path of the entangled photons and carrying out initial transmission state preparation and Bell state measurement on the second path of the entangled photons.
Specifically, the Alice end may include a second polarization beam splitting unit, a first polarization control module, a third polarization beam splitting unit, and a Bell-state measurement module.
The second polarization beam splitting unit is used for receiving the second path of entangled photons, splitting the polarization of the second path of entangled photons into a first component and a second component, and outputting the first component and the second component in parallel with each other.
For example, when the traveling path of the first component acted on by transmission at the polarization beam splitting surface is denoted as L, and the traveling path of the second component acted on by reflection is denoted as R, the second path of entangled photons after acted on by the second polarization beam splitting unit can be expressed as:
the first polarization control module is arranged between the second polarization beam splitting unit and the third polarization beam splitting unit and used for carrying out polarization state modulation on the first component and the second component, and therefore initial transmission state preparation is achieved.
As an example, the first polarization control module may include a first polarization control unit and a second polarization control unit.
The first polarization control unit is used for enabling the polarization state of the first component to be inverted by 90 degrees.
The second polarization control unit is used for carrying out polarization state modulation on the first component and the second component, so that initial transmission state preparation is realized.
For example, the second path of entangled photons modulated in polarization state by the first polarization control module may be expressed as:
in the present invention, the first and second polarization control units may be implemented by means of a polarization controller, or by means of a wave plate. For example, the second polarization control unit may include a quarter-wave plate and a half-wave plate.
The third polarization beam splitting unit may have the same structure as the second polarization beam splitting unit, and is configured to receive the first and second components modulated in polarization state and parallel to each other, and deflect the first component by 90 degrees inside thereof (for example, by reflection), so as to interfere with the second component on the polarization beam splitting surface, and generate the first interference signal and the second interference signal. At this time, the second path of entangled photons can be expressed as:
the Bell state measuring module is used for receiving the first interference signal and the second interference signal and carrying out single photon detection under four orthogonal Bell basis vectors so as to realize Bell state measurement.
As an example, the Bell-state measurement module may include a third polarization control unit, a fourth polarization beam splitting unit, a fourth polarization control unit, a fifth polarization beam splitting unit, and third to sixth single-photon detection units.
The third polarization control unit is arranged in front of the fourth polarization beam splitting unit and used for enabling the polarization state of the first interference signal to rotate by-45 degrees, and the fourth polarization beam splitting unit is used for splitting the first interference signal subjected to polarization state rotation into a first component and a second component.
The fourth polarization control unit is arranged before the fifth polarization beam splitting unit and is used for enabling the polarization state of the second interference signal to be rotated by 45 degrees, and the fifth polarization beam splitting unit is used for splitting the second interference signal subjected to polarization state rotation into third and fourth components.
At this time, the second path of entangled photons may be expressed, for example, as:
wherein the first component, the second component, the third component and the fourth component correspond to | H |, respectively>1|R>，|V>1|R>，|H>1|L>，|V>1|L>And performing single-photon detection by the third to sixth single-photon detection units respectively, thereby realizing Bell state measurement.
In the present invention, the third and fourth polarization control units can be realized by means of a polarization controller, also by means of a wave plate, or by means of a rotation optical axis alignment angle.
In the embodiment of fig. 2, the first polarization beam splitting unit 13 in Bob end may include a polarization beam splitter 13.
The first single photon detection unit may comprise a first coupler 14 and a first single photon detector 16, wherein the first coupler 14 is configured to collect the first component output by the polarization beam splitter 13 and input it to the first single photon detector 16 via a transmission fiber for single photon detection of the first component.
The second single photon detection unit may comprise a second coupler 15 and a second single photon detector 17, wherein the second coupler 15 is configured to collect the second component output by the polarization beam splitter 13 and input it to the second single photon detector 17 via the transmission fiber for single photon detection of the second component.
The second polarization beam splitting unit 1 in the Alice terminal may include a polarization beam splitter portion and a mirror portion, wherein a reflection surface of the mirror portion and a polarization beam splitting surface of the polarization beam splitter portion are parallel to each other. Thus, when the second path of entangled photons enters the second polarization beam splitting unit 1, first a first (transmitted) and a second (reflected) component are formed by polarization beam splitting at the polarization beam splitting surface of the polarization beam splitter portion, wherein the first component will leave the second polarization beam splitting unit directly, and the second component leaves the second polarization beam splitting unit 1 by reflection at the mirror portion, thereby achieving that the first and second components leave the second polarization beam splitting unit 1 in parallel with each other.
In the present invention, the polarization beam splitter portion and the mirror portion are integrated, and they may be bonded together by means of an optical adhesive, for example, to form a trapezoidal shape as shown in fig. 2.
The first polarization control unit 2 may comprise a quarter wave plate 2 to provide a polarization state flip of 90 degrees.
The second polarization control unit 3 may comprise a combination of a half wave plate and a quarter wave plate to prepare the desired initial transmission state.
The third polarization beam splitting unit 4 may have the same structure as the second polarization beam splitting unit 1, and is arranged to allow the first component to propagate toward the polarization beam splitter portion thereof after reflection by the mirror portion thereof, and to allow the second component to interfere with the first component at the polarization beam splitter portion thereof, generating first and second interference signals.
The third polarization control unit 5 may comprise a wave plate 5 for providing a polarization state rotation of-45 degrees for the optical signal.
The fourth polarization beam splitting unit 6 may comprise a dual pigtail polarization beam splitting coupler 6 for receiving the first interference signal to split its polarization into a first and a second component and to transmit the first and second components to the third and fourth single photon detection units 9, 10, respectively, via transmission fibers.
The fourth polarization control unit 7 may comprise a wave plate 7 for providing a polarization state rotation of 45 degrees for the optical signal.
The fifth polarization beam splitting unit 8 may comprise a double pigtail polarization beam splitting coupler 8 for receiving the second interference signal to split its polarization into a third and a fourth component and to transmit the third and fourth components to the fifth and sixth single photon detection units 11 and 12, respectively, via transmission fibers.
The third single photon detection unit 9 may comprise a single photon detector 9 to perform single photon detection of the first component; the fourth single photon detection unit 10 may comprise a single photon detector 10 to perform single photon detection of the second component; the fifth single-photon detection unit 11 may comprise a single-photon detector 11 to perform single-photon detection on the third component; the sixth single photon detection unit 12 may comprise a single photon detector 12 for single photon detection of the fourth component.
Fig. 3 shows another embodiment of the two-photon polarization-path entangled quantum invisible state transfer experimental apparatus according to the present invention. For the sake of brevity, only the differences from the embodiment shown in fig. 2 will be described below, and the same contents will not be described again.
In this embodiment, the quantum invisible state experimental apparatus may further include a first light collection unit and a second light collection unit. In addition, a first collimator 19 and a second collimator 18 may be respectively disposed at the Bob end and the Alice end.
The first light collecting unit is used for collecting the first path of entangled photons output by the entanglement source and transmitting the first path of entangled photons into the Bob end by means of an optical fiber; the second light collecting unit is used for collecting the second path of entangled photons output by the entanglement source and transmitting the second path of entangled photons into the Alice end by virtue of the optical fiber.
As shown in fig. 3 in particular, the first light collecting unit may include a first coupler 21 and a transmission fiber 23, and the Bob end may further include a first collimator 19, where the first coupler 21 is configured to collect and couple the first channel of entangled photons into the transmission fiber 23, and input the first channel of entangled photons in the transmission fiber 23 into the first polarization beam splitting unit in the Bob end through the first collimator 19.
The second light collecting unit may include a second coupler 20 and a transmission fiber 22, and the Alice end may further include a second collimator 18, where the second coupler 20 is configured to collect and couple the second channel of entangled photons into the transmission fiber 22, and the second channel of entangled photons in the transmission fiber 22 is input into the second polarization beam splitting unit in the Alice end through the second collimator 18.
In a preferred example, a polarization compensation unit (e.g., a polarization controller or a wave plate) may also be provided to rectify polarization changes caused during distribution of entangled photons. For example, a polarization controller may be provided after the transmission fibers 22 and 23, or a wave plate may be provided after the collimators 18 and 19.
The transmission fibers 22 and 23 may be single mode fibers or polarization maintaining fibers. In the example of fig. 3, the transmission fibers 22 and 23 may be in the form of fiber jumpers.
Fig. 4 shows another embodiment of the two-photon polarization-path entangled quantum invisible state transfer experimental apparatus according to the present invention. For the sake of brevity, only the differences from the embodiment shown in fig. 3 will be described below, and the same contents will not be described again.
In this embodiment, as shown in figure 4, in Bob end, the first polarization beam splitting unit may comprise a fiber-type polarization-preserving polarization beam splitter 24, the first single-photon detection unit may comprise a first single-photon detector 16, and the second single-photon detection unit may comprise a second single-photon detector 17. The first and second single photon detectors are respectively connected with two output ends of the optical fiber polarization-maintaining beam splitter 24 through transmission optical fibers.
Based on the above, in the utility model discloses an invisible biography attitude experimental apparatus of quantum, utilize a pair of trapezoidal polarization beam splitting structure that the integration has polarization beam splitting and reflection function simultaneously to realize entangling the light splitting of photon and close and restraint, it realizes the preparation of transport state to insert the wave plate simultaneously between two trapezoidal polarization beam splitting structures, and combine two tail optical fiber polarization beam splitting couplers to realize the Bell attitude and measure, can reduce the quantity of light device among the Alice end, thereby realize an optical structure compact Alice end, make its structure can miniaturize, it integrates also to be convenient for, and under this kind of optical design, can conveniently realize aiming at and adjusting of light path, and stability is high, the light path debugging degree of difficulty has been reduced. In addition, the optical path of the present invention allows to realize a part of the optical fiber structure, so that the stability of the whole optical path system can be further enhanced.
Although the present invention has been described in connection with the accompanying drawings by way of specific embodiments, those skilled in the art will readily appreciate that the above-described embodiments are illustrative only and are not intended to be limiting, in view of the principles of the present invention, and that various combinations, modifications and equivalents of the above-described embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (14)
1. A quantum invisible state transfer experimental device with two-photon polarization-path entanglement comprises an entanglement source, an Alice end and a Bob end;
the entanglement source is used for generating entangled photons;
the Bob end is used for receiving the first path of entangled photons and carrying out single photon detection on the first path of entangled photons to reproduce a quantum state;
the Alice end is used for receiving the second path of entangled photons and carrying out initial transmission state preparation and Bell state measurement on the second path of entangled photons;
the method is characterized in that:
the Bob end comprises a first polarization beam splitting unit and a single photon detection module;
the first polarization beam splitting unit is arranged to polarizedly split the first path of entangled photons into a first component and a second component;
the single photon detection module is configured to perform single photon detection on the first component and the second component of the first path of entangled photons; and the number of the first and second groups,
the Alice terminal comprises a second polarization beam splitting unit, a first polarization control module, a third polarization beam splitting unit and a Bell state measuring module, wherein,
the second polarization beam splitting unit is arranged to polarizedly split the second path of entangled photons into first and second components and output the first and second components of the second path of entangled photons in parallel with each other;
the first polarization control module is arranged between the second polarization beam splitting unit and the third polarization beam splitting unit and is used for carrying out polarization state modulation on the first component and the second component of the second path of entangled photons to realize initial transmission state preparation;
the third polarization beam splitting unit is configured to receive the first and second components of the second path of entangled photons and deflect the first component of the second path of entangled photons in a direction so as to interfere with the second component of the second path of entangled photons on a polarization beam splitting surface to generate a first interference signal and a second interference signal;
the Bell state measurement module is configured to receive the first and second interference signals and perform single photon detection under four orthogonal Bell basis vectors to achieve Bell state measurements.
2. The quantum invisible state experimental apparatus of claim 1, wherein: the first polarization beam splitting unit comprises a polarization beam splitter, and the single photon detection module comprises a first single photon detection unit and a second single photon detection unit;
the first single-photon detection unit comprises a first coupler and a first single-photon detector, wherein the first coupler is used for collecting a first component of the first path of entangled photons and inputting the first component of the first path of entangled photons into the first single-photon detector through a transmission optical fiber;
the second single-photon detection unit comprises a second coupler and a second single-photon detector, wherein the second coupler is used for collecting a second component of the first path of entangled photons and inputting the second component of the first path of entangled photons into the second single-photon detector through a transmission optical fiber.
3. The quantum invisible state experimental apparatus of claim 1, wherein: the first polarization beam splitting unit comprises an optical fiber type polarization-maintaining polarization beam splitter;
the single photon detection module comprises a first single photon detector and a second single photon detector; and the number of the first and second electrodes,
the first single-photon detector and the second single-photon detector are respectively connected with two output ends of the optical fiber type polarization-maintaining polarization beam splitter through transmission optical fibers.
4. The quantum invisible state experimental apparatus of claim 1, wherein:
the second polarization beam splitting unit comprises a polarization beam splitter part and a reflecting mirror part which are integrated into a whole, and the reflecting surface of the reflecting mirror part is parallel to the polarization beam splitting surface of the polarization beam splitter part; and the number of the first and second electrodes,
the third polarization beam splitting unit includes a polarization beam splitter portion and a mirror portion integrated as one body, and a reflection surface of the mirror portion is parallel to a polarization beam splitting surface of the polarization beam splitter portion.
5. The quantum invisible state experimental apparatus of claim 1, wherein: the first polarization control module is further configured to flip one of the first and second components of the second path of entangled photons by 90 degrees.
6. The quantum invisible state experimental apparatus of claim 5, wherein: the first polarization control module includes: the first polarization control unit is used for realizing the 90-degree turnover of the polarization state; and a second polarization control unit for implementing the initial transport state preparation.
7. The quantum invisible state experimental apparatus of claim 6, wherein: the first polarization control unit comprises a polarization controller or a wave plate; the second polarization control unit includes a polarization controller or a wave plate.
8. The quantum invisible state experimental apparatus of claim 6, wherein:
the first polarization control unit is a wave plate with the wavelength of 1/4;
the second polarization control unit includes a quarter-wave plate and a half-wave plate.
9. The quantum invisible state experimental apparatus of claim 1, wherein: the Bell state measuring module comprises a third polarization control unit, a fourth polarization beam splitting unit, a fourth polarization control unit, a fifth polarization beam splitting unit and third to sixth single photon detection units;
the third polarization control unit is arranged for polarization control of the first interference signal;
the fourth polarization beam splitting unit is arranged to receive the polarization-controlled first interference signal and to split its polarization into first and second components;
the third and fourth single-photon detection units are respectively arranged for single-photon detection of the first and second components of the first interference signal;
the fourth polarization control unit is configured to perform polarization control on the second interference signal;
the fifth polarization beam splitting unit is arranged to receive the polarization-controlled second interference signal and to split its polarization into a third and a fourth component;
the fifth and sixth single photon detection units are respectively arranged for single photon detection of the third and fourth quantums.
10. The quantum invisible state experimental apparatus of claim 9, wherein: the third polarization control unit is configured to implement one of-45 degree and 45 degree polarization state rotation, and the fourth polarization control unit is configured to implement the other of-45 degree and 45 degree polarization state rotation.
11. The quantum invisible state experimental apparatus of claim 9, wherein:
the third polarization control unit comprises a polarization controller or a wave plate or is realized by means of rotating the optical axis to align the angle; and/or the like, and/or,
the fourth polarization control unit comprises a polarization controller or a wave plate, or is realized by rotating the optical axis alignment angle.
12. The quantum invisible state experimental apparatus of claim 9, wherein:
the fourth polarization beam splitting unit comprises a double-pigtail polarization beam splitting coupler, and the double-pigtail polarization beam splitting coupler is connected with the third and fourth single photon detection units through optical fibers; and/or the like, and/or,
the fifth polarization beam splitting unit comprises a double-pigtail polarization beam splitting coupler, and the double-pigtail polarization beam splitting coupler is connected with the fifth single photon detection unit and the sixth single photon detection unit through optical fibers.
13. The quantum invisible state experimental device of any one of claims 1-12, further comprising a first light collection unit and a second light collection unit; wherein the content of the first and second substances,
the first light collection unit comprises a first coupler and a first transmission fiber, the first coupler being configured to collect and couple the first path of entangled photons into the first transmission fiber for input to the Bob end;
the second light collecting unit comprises a second coupler and a second transmission optical fiber, and the second coupler is configured to collect and couple the second path of entangled photons into the second transmission optical fiber to be input to the Alice terminal.
14. The quantum invisible state experimental apparatus of claim 13, wherein the first transmission fiber is a single mode or polarization maintaining fiber; the second transmission fiber is a single mode or polarization maintaining fiber.
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| GR01 | Patent grant | ||
| GR01 | Patent grant |