WO2018045491A1

WO2018045491A1 - Device and system for generating single photon, method for fixing single-photon source

Info

Publication number: WO2018045491A1
Application number: PCT/CN2016/098245
Authority: WO
Inventors: 耿巍; 张臣雄
Original assignee: 华为技术有限公司
Priority date: 2016-09-06
Filing date: 2016-09-06
Publication date: 2018-03-15
Also published as: CN109196397A; CN109196397B

Abstract

A device and a system for generating a single photon, and a method for fixing a single-photon source; the device for generating a single photon comprises: a waveguide; a resonant cavity located above the waveguide; a thermosensitive polymer located above the waveguide which is provided with the resonant cavity; the thermosensitive polymer is hydrophilic in a condition of being lower than a temperature threshold, and hydrophobic in a condition of not being lower than the temperature threshold. The device for generating a single photon has a simple structure and is easy to manufacture, which may simplify the manufacturing process of devices for use in generating single photons.

Description

Device and system for generating single photon, fixed single photon source method

Technical field

The present invention relates to the field of quantum information device technologies, and in particular, to a device and system for generating single photons, and a method for fixing a single photon source.

Background technique

Quantum information science is a combination of quantum mechanics and information science and technology, including quantum cryptography, quantum communication, quantum computing, quantum measurement, etc. In recent years, important breakthroughs have been made in both theory and experiment. Whether it is quantum communication or quantum computing, a stable, high-rate single photon source is a key device that must be addressed. A single photon source is a light source that emits only one photon at a time.

In the prior art, in order to generate a single photon, a luminescent material indium arsenide (InAs) and an aluminum indium arsenide (AlGaAs) quantum dot are generally coupled into a nanowire of a lattice structure similarly during growth. After the luminescent material is then excited, it produces spontaneous radiation due to photoluminescence, releasing a single photon stream equivalent to the forbidden band energy. These photons have a specific direction of illumination and a distribution of luminescence fields due to being bound in nanowires similar to optical waveguides.

In the above scheme, the growth of InAs and AlGaAs quantum dots into nanowires requires higher processing levels and more complicated fabrication processes.

Summary of the invention

Embodiments of the present invention provide a device and system for generating single photons, and a method for fixing a single photon source for simplifying a fabrication process of a device for generating a single photon, and generating a single photon by a simple method.

In a first aspect, an embodiment of the present invention provides a device for generating a single photon, comprising: a waveguide; a resonant cavity located above the waveguide; and a heat sensitive polymer located above the waveguide provided with the resonant cavity; Wherein the thermosensitive polymer is hydrophilic under conditions less than a temperature threshold and hydrophobic under conditions not less than a temperature threshold. It can be seen that the device for generating single photons has a simple structure, and Easy to manufacture, simplifying the fabrication process for devices that generate single photons.

Optionally, the resonant cavity is a surface plasmon resonant cavity. In this way, the light intensity of a single photon located in the resonant cavity can be further increased. Optionally, the resonant cavity is composed of two metal pieces. In this way, the light intensity of a single photon located in the resonant cavity can be further increased. Optionally, the resonant cavity is formed by any one of the following forms: formed by a predetermined distance between two apex angles respectively located on two triangular metal members; formed by a predetermined distance of bimetal nanowires; The balls are formed by a predetermined distance. In this way, on the one hand, the single photon located in the resonant cavity can be better fixed, and on the other hand, the light intensity of the single photon located in the resonant cavity can be increased.

Optionally, the means for generating a single photon further comprises an antenna. An antenna is located above the waveguide below the thermosensitive polymer; wherein the resonant cavity is located at a feed assembly of the antenna. As such, a single photon generated at the cavity of the device for generating a single photon can propagate in a particular direction at the feed assembly of the antenna, thereby well controlling the direction of the resulting single photon. Further, placing the resonant cavity at the feed assembly of the antenna enhances the intensity of the photons generated at the resonant cavity. In a third aspect, since the antenna is placed over the waveguide, the antenna can produce a diagonally downward light field that enters the waveguide, thereby better coupling a single photon generated at the resonant cavity into the waveguide. Optionally, the antenna is a Yagi antenna. In this way, it is possible to better control the single photon to propagate in a specific direction.

In a second aspect, an embodiment of the present invention provides a method for fixing a single photon source in a device for generating a single photon according to any of the embodiments of the present invention, comprising: at a resonant cavity on a device for generating a single photon Irradiating a laser; flowing a liquid carrying a single photon source on a surface of the thermosensitive polymer; wherein a ligand of the single photon source in the liquid carrying the single photon source is hydrophobic; wherein the laser is used : increasing the temperature within the resonant cavity to convert the thermosensitive polymer from hydrophilic to hydrophobic and attracting the liquid carrying the single photon source to reside within the resonant cavity. It can be seen that the device for generating single photons has a simple structure and is easy to manufacture, and simplifies the fabrication process of a device for generating single photons.

Optionally, the single photon source in the liquid carrying the single photon source is a colloidal quantum dot or a dye molecule. Thus, on the one hand, the single photon source used in the embodiments of the present invention does not require harsh environmental requirements, such as requiring extremely low ambient temperature, etc., thereby simplifying the generation process; The liquid of the single photon source flows on the upper surface of the device for generating a single photon provided in the embodiment of the present invention, thereby successfully implementing the solution provided by the embodiment of the present invention.

Optionally, a difference between a local oscillator frequency of the resonant cavity and a local oscillator frequency of the single photon source is less than a resonant frequency threshold; and a local oscillator frequency of the antenna included in the device for generating a single photon A difference from a local oscillator frequency of the single photon source is less than the resonant frequency threshold. In this way, the local oscillator frequency of the resonant cavity is close to the local oscillator frequency of the single photon source, so that resonance can occur under the action of the laser, thereby enhancing the single photon light intensity. Moreover, the local oscillator frequency of the antenna is close to the local oscillator frequency of the single photon source, so resonance can occur under the action of the laser, thereby enhancing the single photon light intensity.

In a third aspect, an embodiment of the present invention provides a single photon generation system, including the device for generating single photons, a laser and a liquid inflow device according to any one of the embodiments of the present invention, wherein: the laser is used for Irradiating a laser at a resonant cavity on the device for generating a single photon; the liquid inflow device for flowing a liquid carrying a single photon source on a surface of the thermosensitive polymer; wherein the single photon source is carried The ligand of the single photon source in the liquid is hydrophobic; wherein the laser is used to: increase the temperature in the cavity to convert the thermosensitive polymer from hydrophilic to hydrophobic And attracting the liquid carrying the single photon source to stay in the resonant cavity, and causing the liquid carrying the single photon source staying in the resonant cavity to emit a single photon under the illumination of the laser, A single photon is coupled to the internal transmission of the waveguide.

In an embodiment of the invention, a device for generating a single photon includes a waveguide; a resonant cavity above the waveguide; a heat sensitive polymer above the waveguide provided with the resonant cavity; wherein the thermal polymerization The substance is hydrophilic under conditions less than the temperature threshold and hydrophobic under conditions not less than the temperature threshold. It can be seen that the device for generating single photons has a simple structure and is easy to manufacture, and simplifies the fabrication process of a device for generating single photons.

Further, when a single photon is generated based on the device for generating a single photon, only a laser is irradiated at a cavity on a device for generating a single photon source; a surface carrying the single photon source flows into the surface of the thermosensitive polymer Liquid can be. The ligand of the single photon source in the liquid carrying the single photon source is hydrophobic. Therefore, irradiating the laser at the resonant cavity can raise the temperature in the resonant cavity, converting the thermosensitive polymer from hydrophilic to hydrophobic, and attracting the liquid carrying the single photon source. Retaining within the resonant cavity, and causing the liquid carrying the single photon source to reside within the resonant cavity to emit a single photon under illumination of the laser, the single photon being coupled to the internal transmission of the waveguide. It can be seen that in the embodiment of the present invention, a single photon is generated by a simple method, and coupling of a single photon and a waveguide is realized.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.

1 is a schematic structural diagram of a device for generating a single photon according to an embodiment of the present invention;

2 is a schematic diagram of steps of a method for fabricating a device for generating single photons according to an embodiment of the present invention;

3 is a schematic diagram of steps of a method for fabricating a device for generating single photons according to an embodiment of the present invention;

4 is a schematic diagram of steps of a method for fabricating a device for generating single photons according to an embodiment of the present invention;

5 is a schematic diagram of steps of a method for fabricating a device for generating single photons according to an embodiment of the present invention;

6 is a schematic diagram of steps of a method for fabricating a device for generating single photons according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of direction A in FIG. 6 according to an embodiment of the present invention; FIG.

FIG. 8 is a schematic diagram of a method for fixing a single photon source in a device for generating single photons according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic structural diagram of a single photon generation system according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of direction A in FIG. 9 according to an embodiment of the present invention; FIG.

Figure 11 is a schematic illustration of the intensity of a single photon in a resonant cavity and the intensity of light in free space in an embodiment of the invention.

detailed description

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the specific implementation, in many fields, a stable, high-rate single photon source is a key device that must be solved. Specifically, in the field of quantum communication, the generated single photon can be transmitted as a quantum bit in a space or a fiber, wherein the quality of the single photon source has a decisive influence on the key yield and photon coherence. In the field of quantum computing, a large number of parallel operations can be performed using the linear action of a single or entangled photon. Whether a single-photon source can produce an "on-demand" photon is a quantum computing success. One of the premises. In metrology, single-photon can be used for super-diffraction-limited imaging of biological samples, where the brightness, monochromaticity, etc. of individual photons also have a decisive influence on image quality. In terms of basic experiments, the identification of Bell's inequality in quantum mechanics, the search for gravitational waves, etc., single photons also play a huge role.

Based on the above polling, the embodiment of the present invention provides a device and system for generating single photons, and a method for fixing a single photon source, which is used for simplifying the manufacturing process of a device for generating single photons, and is generated by a simple method. Single photon.

FIG. 1 is a schematic structural diagram of a device for generating a single photon according to an embodiment of the present invention. As shown in FIG. 1, the device for generating a single photon includes: a waveguide 102; a resonant cavity 103; Thermosensitive polymer 105.

Wherein the resonant cavity 103 is located above the waveguide; the thermosensitive polymer 105 is located above the waveguide 102 provided with the resonant cavity 103; wherein the thermosensitive polymer 105 is hydrophilic under conditions less than a temperature threshold Sexuality, which is hydrophobic under conditions not less than the temperature threshold. The temperature threshold is a temperature value and can be determined according to the specific operating environment.

Optionally, the resonant cavity is a surface plasmon resonant cavity. Optionally, the resonant cavity is composed of two metal pieces. Optionally, the resonant cavity is composed of two nano-metal pieces. In this way, the light intensity of a single photon located in the resonant cavity can be further increased.

Optionally, the resonant cavity is formed by any one of the following forms: The two apex angles of the member are formed by a predetermined distance; the bimetallic nanowires are formed by a predetermined distance; and the bimetallic nanospheres are formed by a predetermined distance. Specifically, the resonant cavity may be composed of two components, and the two components are separated by a predetermined distance. For example, the two sharp corners of the two triangles are separated by a predetermined distance, and the two components can form a resonant cavity. For details, please refer to the resonant cavity 103 shown in FIG. For example, the top ends of the two bimetallic nanowires are formed by a predetermined distance; for example, the bimetallic nanospheres are formed by a predetermined distance. In this way, on the one hand, the single photon located in the resonant cavity can be better fixed, and on the other hand, the light intensity of the single photon located in the resonant cavity can be increased.

In the embodiment of the invention, under the action of the thermosensitive polymer, a single photon is generated at the cavity and introduced into the inside of the waveguide. It can be seen that the device for generating single photons has a simple structure and is easy to manufacture, and simplifies the fabrication process of a device for generating single photons.

Optionally, in order to better control the direction of the single photon, the device for generating a single photon further includes: an antenna located above the waveguide under the thermosensitive polymer; wherein the resonant cavity is located in the At the feed assembly of the antenna, the resonant cavity is used at the feed assembly of the antenna, that is, the resonant cavity constitutes the feed assembly of the antenna. As such, a single photon generated at the cavity of the device for generating a single photon can propagate in a particular direction at the feed assembly of the antenna, thereby well controlling the direction of the resulting single photon. Further, the use of a resonant cavity structure at the feed assembly of the antenna enhances the intensity of the single photon generated at the resonant cavity. In a third aspect, since the antenna is placed over the waveguide, the antenna can produce a diagonally downward light field that enters the waveguide, thereby better coupling a single photon generated at the resonant cavity into the waveguide.

Alternatively, the antenna type may be various, as long as the single photon can be controlled to propagate in a specific direction. Preferably, the antenna is an Yagi antenna.

Based on the above description, embodiments of the present invention provide a method of fabricating the above-described device for generating a single photon, and FIGS. 2, 3, 4, 5, and 6 illustrate the preparation of the above device for generating a single photon. Schematic diagram of method steps:

First, as shown in Figure 2, the substrate 101 is prepared first;

Second, a layer of waveguide 102 is prepared on the substrate 101, as shown in FIG.

Third, as shown in FIG. 4, a resonant cavity 103 is fabricated on the waveguide 102, optionally, complementary a metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS for short) process to prepare the resonant cavity 103;

Fourth, optionally, as shown in FIG. 5, an antenna 104 is fabricated over the waveguide 102. Alternatively, the antenna 104 can be fabricated using a CMOS process. The resonant cavity 103 is located at the feed assembly of the antenna 104. That is, replacing the feed assembly of the antenna 104 with the resonant cavity 103;

Fifth, the surface of the structure is covered with a layer of thermosensitive polymer 105, as shown in FIG. The thermosensitive polymer is hydrophilic under conditions less than a temperature threshold and hydrophobic under conditions not less than a temperature threshold. In particular, the thermosensitive polymer 105 is available in a variety of materials, such as poly N-isopropyl acrylamide (PNIPAM), which changes from hydrophilic to higher than a certain temperature (e.g., 32 ° C). Hydrophobic.

FIG. 7 exemplarily shows a schematic view of the direction A in FIG. 6 provided by the embodiment of the present invention. As shown in FIG. 7, the resonant cavity 103 is a butterfly shape, that is, separated by two sharp corners of two triangular metal members. The preset distance is formed. The antenna shown in Fig. 7 is a Yagi antenna.

Based on the above, FIG. 8 exemplarily shows a method for fixing a single photon source in a device for generating single photons, as shown in FIG. 8 , including:

Step 801, irradiating a laser at a resonant cavity on a device for generating a single photon;

Step 802, flowing a liquid carrying a single photon source on the surface of the thermosensitive polymer; wherein the ligand of the quantum dot in the liquid carrying the single photon source is hydrophobic; wherein the laser is used to: be in the resonant cavity The increase in temperature causes the thermosensitive polymer to change from hydrophilic to hydrophobic and attracts a liquid carrying a single photon source to reside in the cavity.

It can be seen that the single photon source can be fixed at the resonant cavity through the

above steps

801 and 802, which solves the problem that the prior art cannot fix the single photon source, and further provides a basis for controlling the direction of the single photon.

Optionally, a difference between a local oscillator frequency of the antenna and a local oscillator frequency of the single photon source is less than a resonance frequency threshold, such that a local oscillator frequency of the antenna is closer to a local oscillator frequency of the single photon source, Resonance can occur with a single photon source emitting light, thereby directing single photon emission in one direction. Optionally, a difference between a local oscillator frequency of the resonant cavity and a local oscillator frequency of the single photon source is less than a resonant frequency threshold. Thus, the local oscillator frequency of the resonant cavity is close to the local oscillator frequency of the single photon source, so Resonance can occur under the action of a laser to enhance single-photon light intensity.

In an embodiment of the invention, an alternative method for determining the material of the resonant cavity and the antenna is to determine the resonant cavity and the antenna material according to the wavelength band in which the single photon source is located. For example, when the laser band is in the visible to near-infrared range, the resonator and the antenna can be made of gold, silver, copper or aluminum. When the laser band is in the mid-infrared band, highly resonant semiconductors can also be used for the cavity and antenna. Alternatively, the materials of the resonant cavity and the antenna may be the same or different. When selecting the material of the cavity and the antenna, the resonant cavity, the antenna and the single photon source are resonated as much as possible, even if the single-photon frequency of the single photon emitted by the cavity, the antenna and the single photon source is the same, thereby enhancing the single photon Light intensity. Alternatively, the local oscillator frequency of the antenna can be changed by changing the size of the antenna.

Optionally, further, illuminating the resonant cavity with a laser such that a single photon source in the liquid carrying the single photon source staying within the resonant cavity emits a single photon under illumination of the laser, the single Photons are coupled to the internal transmission of the waveguide.

Optionally, the single photon source in the liquid carrying the single photon source is a colloidal quantum dot or a dye molecule. Or a single photon source in a liquid carrying a single photon source is a single photon source synthesized by other chemical means. Optionally, the colloidal quantum dots are II-VI quantum dots, such as cadmium selenide (CdSe), zinc sulfide (ZnS), and the like. The single photon source in a liquid carrying a single photon source is not limited to Group II-VI quantum dots, but may be other semiconductor quantum dots. Thus, on the one hand, the single photon source used in the embodiments of the present invention does not require harsh environmental requirements, such as requiring extremely low ambient temperature, etc., thereby simplifying the generation process; on the other hand, the liquid carrying the single photon source can be made. The upper surface of the device for generating a single photon provided in the embodiment of the present invention flows to successfully implement the solution provided by the embodiment of the present invention.

In a specific implementation, when the single photon source is a semiconductor quantum dot, since the size of the semiconductor quantum dot is extremely small, the diameter is several nanometers (nm) to more than ten nm, and the wave function of binding electrons in the three-dimensional direction causes it to have in the quantum dot. Discrete energy levels, so semiconductor quantum dots can be used to create a two-level system similar to atoms. The use of pump light of the appropriate wavelength to excite electrons in a semiconductor quantum dot can transition from a low energy level to a high energy level. When electrons return to a low energy level, they release a fixed-energy photon. Therefore, such a semiconductor quantum dot can be used as a "deterministic" single photon source, that is, as long as the irradiation pump The pulse, which releases a single photon.

In the embodiment of the present invention, the ligand of the single photon source included in the liquid state carrying the single photon source can be flexibly changed, for example, the ligand of the single photon source in the liquid carrying the single photon source is set to be hydrophobic. .

Based on the same concept, FIG. 9 exemplarily shows a schematic structural view of a single photon generation system, as shown in FIG. 9, the system includes a device for generating single photons, a laser 110 and a liquid inflow device 111, wherein:

The laser 110 is configured to illuminate a laser 109 at a resonant cavity 103 on the device for generating a single photon; the liquid inflow device 111 is configured to flow a single photon source on a surface of the thermosensitive polymer 105 a liquid 106; wherein the ligand of the single photon source 107 in the liquid 106 carrying the single photon source is hydrophobic; wherein the laser 109 is used to: raise the temperature in the resonant cavity 103 The thermosensitive polymer in the irradiated region of the laser is converted from hydrophilic to hydrophobic, and the liquid 106 carrying the single photon source is attracted to the resonant cavity 103.

Alternatively, the properties of the thermosensitive polymer that are excited to change include, but are not limited to, physical or chemical properties such as hydrophilicity, chemical bonding, and the like. That is, the thermosensitive polymer changes from hydrophilic to hydrophobic under temperature changes. The thermosensitive polymer may also have other alterable physical or chemical properties and the like. As long as the single photon source can be adsorbed after the properties of the thermosensitive polymer are changed, the single photon source cannot be adsorbed before the property changes.

Further, optionally, when the single photon is generated by using the device for generating single photons, a single photon source fixed at the center of the resonant cavity may be irradiated with laser light having energy greater than the forbidden band energy of the photon source to emit a single photon. The single photon is coupled to the waveguide for internal transmission.

Fig. 10 exemplarily shows a schematic view of the direction A in Fig. 9 in the embodiment of the present invention, which will be described in detail below with reference to Figs. 9 and 10.

As shown in FIG. 9, the laser light 109 emitted from the laser 110 is irradiated over the cavity 103. As shown in FIG. 10, the laser irradiation region 106 covers the cavity 103. Thereafter, the liquid inflow device 111 carries the liquid 106 carrying the single photon source, and the liquid 106 carrying the single photon source carried in the liquid inflow device 111 is poured onto the device for generating a single photon, specifically, poured into the The surface of the thermosensitive polymer 105. Optionally, a liquid 106 carrying a single photon source is poured from the left side of the resonant cavity 103 to carry The single photon source liquid 106 flows through the entire upper surface of the device for generating a single photon and partially flows out from the right side. Alternatively, the single photon source-carrying liquid 106 flowing from the upper surface of the device for generating single photons can be flowed into a recovery tank for re-circulation.

Optionally, the resonant cavity is a surface plasmon resonator, and due to plasmon resonance of the plasma surface, the tip of the nano metal of the resonant cavity will locally enhance. The electrons in the single photon source placed therein produce a Purcell effect (ie, the relaxation time of electrons at high and low energy transitions is greatly reduced), further enhancing the brightness of the single photon source.

Alternatively, the laser light 109 is irradiated above the resonant cavity 103. As shown in FIG. 10, when the laser light 109 is irradiated on the resonant cavity 103, the center of the resonant cavity 103 is increased in a very small space due to the local enhancement of the electric field, thereby causing thermal polymerization in the resonant cavity 103. The substance 105 is converted from hydrophilic to hydrophobic. Since the ligand of the single photon source is also hydrophobic, when a liquid 106 carrying a single photon source flows through the resonant cavity 103, the single photon source therein is adsorbed in the resonant cavity 103. Since the laser heating range is extremely small, and the thermosensitive polymer 105 outside the laser irradiation region 106 is still hydrophilic, the liquid carrying the single photon source flowing through the hydrophilic thermosensitive polymer is used along the generation sheet. The upper surface of the photonic device flows away. Alternatively, the laser irradiation range is small and the resonant cavity is also small, and the number of single photons that are attracted in the resonant cavity may be one. It can be seen that, by the solution provided by the embodiment of the present invention, the position of the single photon source is accurately controlled, that is, it is fixed in the resonant cavity.

Further, in the embodiment of the present invention, optionally, the single photon source fixed in the resonant cavity and the resonant cavity is located at the feeding component of the antenna, and under the laser irradiation, the single photon source generates a single photon, and the single photon acts on the antenna. Down, it travels in a specific direction to achieve the purpose of controlling the single photon propagation direction. As shown in FIG. 10, the single photon 108 will propagate along the right side of the antenna.

Further, since the refractive index of the waveguide 102 is higher than the refractive index of the surrounding medium, a single photon generated from the resonant cavity is bound to the waveguide 102 having a higher refractive index, thereby achieving coupling of a single photon and a waveguide.

In the embodiment of the invention, the device for generating single photons has a simple structure and is easy to manufacture, and simplifies the manufacturing process of the device for generating single photons.

Second, the single photon source can be fixed at the resonant cavity by the device for generating a single photon. The purpose of fixing a single photon is now achieved.

Third, the use of lasers with energy greater than the forbidden band energy of the single photon source illuminates the single photon source, which further enhances the intensity of the single photon source due to the Purcell effect of the cavity. FIG. 11 exemplarily shows a light intensity of a single photon in a resonant cavity and a light intensity in a free space in the embodiment of the present invention, as shown in FIG. 11, in the case where the excitation intensity of the laser is constant, a single photon The intensity of light in the cavity is much greater than the intensity of the single photon in free space.

Fourth, under the action of the antenna, the single photon generated by the single photon source is transmitted in a specific direction, achieving the purpose of fixing the single photon direction.

Fifth, the device for generating single photons provided by the embodiments of the present invention can successfully couple a single photon into the waveguide.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of the invention as claimed.

Claims

A device for generating a single photon, comprising:

waveguide;

a resonant cavity located above the waveguide;

a thermosensitive polymer above the waveguide provided with the resonant cavity; wherein the thermosensitive polymer is hydrophilic under conditions less than a temperature threshold and hydrophobic under conditions not less than a temperature threshold.
The device for generating a single photon according to claim 1, further comprising:

An antenna positioned above the waveguide under the thermosensitive polymer; wherein the resonant cavity is located at a feed assembly of the antenna.
The device for generating a single photon according to claim 2, wherein the antenna is a Yagi antenna.
A device for generating single photons according to any one of claims 1 to 3, wherein the resonant cavity is a surface plasmon resonant cavity.
A device for generating a single photon according to any one of claims 1 to 4, wherein the resonant cavity is composed of two metal members.
The device for generating single photons according to any one of claims 1 to 5, wherein the resonant cavity is formed by any one of the following forms:

The two apex angles respectively located on the two triangular metal members are formed by a predetermined distance; the bimetal nanowires are formed by a predetermined distance; and the bimetallic nanospheres are formed by a predetermined distance.
A method for fixing a single photon source in a device for generating a single photon according to any one of claims 1 to 6, characterized in that it comprises:

Irradiating a laser at a resonant cavity on a device for generating a single photon;

Flowing into the liquid carrying the single photon source on the surface of the thermosensitive polymer; wherein the ligand of the single photon source in the liquid carrying the single photon source is hydrophobic;

Wherein the laser is used to: raise a temperature in the resonant cavity to cause the thermal polymerization The composition converts from hydrophilic to hydrophobic and attracts the liquid carrying the single photon source to reside within the resonant cavity.
The method of claim 7 wherein the single photon source in the liquid carrying the single photon source is a colloidal quantum dot or dye molecule.
The method of claim 7 wherein a difference between a local oscillator frequency of said resonant cavity and a local oscillator frequency of said single photon source is less than a resonant frequency threshold;

The difference between the local oscillator frequency of the antenna further included in the device for generating a single photon and the local oscillator frequency of the single photon source is less than the resonant frequency threshold.
A single photon generating system comprising the device for generating a single photon, a laser and a liquid inflow device according to any of claims 1 to 6, wherein:

The laser is configured to illuminate a laser at a resonant cavity on the device for generating a single photon;

The liquid inflow device is configured to flow into a liquid carrying a single photon source on a surface of the thermosensitive polymer; wherein a ligand of the single photon source in the liquid carrying the single photon source is hydrophobic;

Wherein the laser is used to: raise a temperature in the resonant cavity, convert the thermosensitive polymer from hydrophilic to hydrophobic, and attract the liquid carrying the single photon source to stay in the Within the resonant cavity, the liquid carrying the single photon source remaining within the resonant cavity emits a single photon upon illumination of the laser, the single photon being coupled to the internal transmission of the waveguide.