A non-reciprocal quantum entangled holographic imaging device

Abstract

The application provides a non-reciprocal quantum entanglement holographic imaging device, comprising a metasurface structure, a polarization entangled photon pair generator, a magneto-optical modulator and a single-photon detection imaging assembly, idle frequency photons generated by the polarization entangled photon pair generator are transmitted to the magneto-optical modulator through an idle frequency photon channel, and the magneto-optical modulator modulates the polarization state of the idle frequency photons; signal photons generated by the polarization entangled photon pair generator are transmitted to the metasurface structure through a signal photon channel, the metasurface structure interacts with the signal photons; the single-photon detection imaging assembly acquires a non-reciprocal entanglement holographic image from the magneto-optical modulator and the metasurface structure; one-way imaging is realized by breaking time reversal symmetry to suppress backscatter noise, so that the quality of holographic imaging is improved.

Description

Technical Field

[0001] This invention relates to the field of micro-nano optics technology, and in particular to a non-reciprocal quantum entanglement holographic imaging device. Background Technology

[0002] Since its inception, holographic imaging technology has revolutionized the way light wavefronts are recorded and reconstructed, supporting numerous applications including microscopic imaging, interferometry, data storage, and information security. Extending this concept to the quantum realm, the construction of quantum holography makes the reconstruction of entangled wave functions possible and demonstrates enormous potential in high-dimensional quantum information processing.

[0003] However, traditional quantum holography relies on discrete, bulky optical components (such as polarizers, lenses, and spatial light modulators), which suffer from stringent alignment requirements, poor scalability, and difficulty in chip integration. In recent years, the effective combination of metasurfaces and quantum optics has provided a planar, multifunctional ideal platform for the development of quantum technologies. The emergence of metasurfaces offers a transformative approach to overcoming these limitations, enabling scalable, high-dimensional, and noise-resistant quantum entangled holography.

[0004] Despite these considerable advances, the inherent time-reversal symmetry of quantum information transmission leads to reciprocity—meaning that the optical path is inherently reversible. This creates a fundamental conflict: emerging quantum technologies such as quantum-secure communication and quantum networks require non-reciprocity to enable unidirectional information flow, thereby blocking noise and preventing information leakage. Existing quantum metasurfaces have attempted to address this issue but remain limited to achieving certain non-reciprocal quantum effects, including unidirectional single-photon blocking and non-reciprocal quantum entanglement sources. Integrating non-reciprocity into the core technology of quantum metasurface holographic platforms has not yet been achieved. Therefore, researching and developing new entangled holographic techniques to improve the quality and security of holographic images is of particular significance. Summary of the Invention

[0005] This invention provides a non-reciprocal quantum entanglement holographic imaging device, the purpose of which is to improve the quality of holographic imaging.

[0006] To achieve the above objectives, the present invention provides a non-reciprocal quantum entanglement holographic imaging device, comprising a metasurface structure, a polarization entangled photon pair generator, a magneto-optical modulator, and a single-photon detection imaging component. A signal photon channel and an idler photon channel are formed between the polarization entangled photon pair generator and the single-photon detection imaging component; The metasurface structure is set in the signal photon channel; The magneto-optical modulator is placed in the idler photon channel; The idler photons generated by the polarization entangled photon pair generator are transmitted to the magneto-optical modulator through the idler photon channel, and the magneto-optical modulator modulates the polarization state of the idler photons; Signal photons generated by the polarization entangled photon pair generator are transmitted to the metasurface structure through the signal photon channel, and the metasurface structure interacts with the signal photons. The single-photon detection imaging component acquires non-reciprocal entangled holographic images from magneto-optical modulators and metasurface structures.

[0007] Furthermore, the metasurface structure comprises multiple metasurface units arranged in an array, each metasurface unit including a substrate and a nanopillar, with the nanopillar standing upright in the center of the substrate.

[0008] Furthermore, the substrate of the metasurface building blocks is quartz glass, and the nanopillars of the metasurface building blocks are made of polycrystalline silicon.

[0009] Furthermore, the fabrication process of metasurface structures includes: Step 1: Acquire the target holographic image and use the holographic image phase retrieval algorithm to calculate the phase distribution map of the orthogonal polarization channels in the target holographic image; Step 2: The optical field transmission characteristics of nanopillars with different geometric dimensions are numerically calculated using the finite-difference time-domain method, and the structural parameters of the metasurface constituent units are determined based on the optical field transmission characteristics. Step 3: By scanning the images of amplitude and phase changes with the size of the nanopillars using structural parameters, phase maps and amplitude maps are obtained; Step 4: Based on the phase distribution map, phase map, and amplitude map of the signal photon channel, find the metasurface constituent units that meet the structural size conditions pixel by pixel; Step 5: Generate a fabrication pattern based on the structural dimensions of each metasurface unit, and fabricate the metasurface using the fabrication pattern and micro / nano fabrication technology to obtain the metasurface structure.

[0010] Furthermore, the structural parameters of the nanopillars include height, major axis, minor axis, in-plane rotation angle, and period.

[0011] Furthermore, the range of variation between the long axis and short axis of the nanopillars is 200nm-500nm.

[0012] Furthermore, the magneto-optical modulator includes a first polarizer, a second polarizer, and a magneto-optical crystal; A magneto-optical crystal is positioned between the first polarizer and the second polarizer; Magneto-optic crystals are surrounded by an external magnetic field, which is used to modulate the polarization state of idler photons.

[0013] Furthermore, the single-photon detection imaging component includes a scanning photocurrent microscope and a single-photon camera; The scanning photocurrent microscope acquires modulated idler photons from the magneto-optical modulator and sends them to the single-photon camera; A single-photon camera can capture signal photons after interaction from a metasurface structure. Non-reciprocal entangled holographic images are obtained based on modulated idler photons and interacting signal photons.

[0014] The above-described solution of the present invention has the following beneficial effects: This invention designs a non-reciprocal quantum entanglement holographic imaging device comprising a metasurface structure, a polarization entanglement photon pair generator, a magneto-optical modulator, and a single-photon detection imaging component. Idle photons generated by the polarization entanglement photon pair generator are transmitted to the magneto-optical modulator through an idler photon channel, where the magneto-optical modulator modulates the polarization state of the idler photons. Signal photons generated by the polarization entanglement photon pair generator are transmitted to the metasurface structure through a signal photon channel, where the metasurface structure interacts with the signal photons. The single-photon detection imaging component acquires a non-reciprocal entanglement holographic image from the magneto-optical modulator and the metasurface structure. Compared with existing technologies, this invention, by modulating the polarization state of the idler photons and pre-setting the polarization-modulated metasurface holographic image, can achieve non-reciprocal entanglement holographic imaging under both forward and reverse incident conditions of entangled photon pairs. By breaking time-reversal symmetry to achieve unidirectional imaging, backscatter noise is suppressed, thereby improving the quality of holographic imaging.

[0015] Other beneficial effects of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the non-reciprocal quantum entanglement holographic imaging device in an embodiment of the present invention; Figure 2 This is a schematic diagram and transport characteristic diagram of the metasurface constituent units in an embodiment of the present invention; Figure 3 This is a holographic entanglement imaging diagram of an embodiment of the present invention under forward and reverse incident conditions.

[0017] Explanation of reference numerals in the attached figures: 1-Polarization entangled photon pair generator; 2-Magneto-optic modulator; 3-Metasurface structure 21-First polarizer; 22-Magneto-optical crystal; 23-Second polarizer 4-Single-photon detection imaging assembly 41-Scanning photocurrent microscope 42-Single-photon camera. Detailed Implementation

[0018] To make the technical problems, solutions, and advantages of this invention clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a locking connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] This invention addresses the existing problems by providing a non-reciprocal quantum entanglement holographic imaging device.

[0023] like Figure 1 As shown, an embodiment of the present invention provides a non-reciprocal quantum entanglement holographic imaging device, including a metasurface structure 3, a polarization entanglement photon pair generator 1, a magneto-optical modulator 2, and a single-photon detection imaging component 4; A signal photon channel and an idler photon channel are formed between the polarization entangled photon pair generator 1 and the single-photon detection imaging component 4; Metasurface structure 3 is disposed in the signal photon channel; Magneto-optic modulator 2 is positioned in the idler photon channel; The idler photons generated by the polarization entangled photon pair generator 1 are transmitted to the magneto-optical modulator 2 through the idler photon channel, and the magneto-optical modulator 2 modulates the polarization state of the idler photons. The signal photons generated by the polarization entangled photon pair generator 1 are transmitted to the metasurface structure 3 through the signal photon channel, and the metasurface structure 3 interacts with the signal photons. The single-photon detection imaging component 4 acquires non-reciprocal entangled holographic images from the magneto-optical modulator 2 and the metasurface structure 3.

[0024] Specifically, such as Figure 2 As shown, the metasurface structure 3 comprises multiple metasurface constituent units arranged in an array. Each metasurface constituent unit includes a substrate and a nanopillar, with the nanopillar standing upright in the center of the substrate. Figure 2 As shown in a(1).

[0025] The embodiments of the present invention utilize the computational holographic image phase retrieval (GS, Gerchberg-Saxton) algorithm to calculate the phase of the target holographic image, and calculate the final phase distribution map for each orthogonal polarization channel.

[0026] In this embodiment of the invention, the nanopillar can be represented by a Jones matrix to characterize the relationship between the incident and emitted light fields. The expression for the nanopillar is: ; in, Indicates nanopillars, Indicates orientation as The rotation matrix, , These represent the transport phases along the symmetry axis of the nanopillar.

[0027] The embodiments of the present invention combine the transport phase and geometric phase of the nanopillars with the phase distribution map to realize the arrangement of metasurface combination units on arbitrary coordinates in the plane.

[0028] Specifically, the substrate of the metasurface building blocks is quartz glass, and the nanopillars of the metasurface building blocks are made of polycrystalline silicon.

[0029] In this embodiment of the invention, the substrate is selected as quartz glass, but it can also be a chemical material such as silicon dioxide, aluminum oxide or calcium fluoride; the nanopillars are selected as polycrystalline silicon material, and can be silicon, silicon nitride, titanium dioxide or germanium.

[0030] In the embodiments of the present invention, the cross-section of the nanopillar is elliptical or rectangular. When orthogonally linearly polarized light is incident along the axis of symmetry of the nanopillar, different phase values ​​can be obtained. By optimizing its structural parameters, independent control of orthogonal arbitrary polarization states can be achieved. Its phase value is obtained through a holographic iterative algorithm. By selecting the phase value required for a specific structural amplitude, different holographic images can be realized on the imaging plane under different orthogonal linear polarizations (such as x and y linear polarizations or 45 degrees and 135 degrees linear polarizations).

[0031] Specifically, the fabrication process of metasurface structure 3 includes: Step 1: Acquire the target holographic image and use the holographic image phase retrieval algorithm to calculate the phase distribution map of the orthogonal polarization channels in the target holographic image; Step 2: The optical field transmission characteristics of nanopillars with different geometric dimensions are numerically calculated using the finite-difference time-domain method, and the structural parameters of the metasurface constituent units are determined based on the optical field transmission characteristics. Step 3: By scanning the images of amplitude and phase changes with the size of the nanopillars using structural parameters, phase maps and amplitude maps are obtained; Step 4: Based on the phase distribution map, phase map, and amplitude map of the signal photon channel, find the metasurface constituent units that meet the structural size conditions pixel by pixel; Step 5: Generate a fabrication pattern based on the structural dimensions of each metasurface unit, and fabricate the metasurface using the fabrication pattern and micro / nano fabrication technology to obtain metasurface structure 3.

[0032] Specifically, in this embodiment of the invention, for photon pairs with an incident wavelength of 810 nm, the refractive index of the nanopillars used is... Obtained along the structural parameters by scanning shaft and The phases of linearly polarized light along the axial direction are respectively and By adjusting the height of the nanopillars, the phase can be completely covered. The range, while the transmission amplitude and It should be as large as possible, such as Figure 2 As shown in b, c, and d.

[0033] Specifically, the structural parameters of the nanopillars include height, major axis, minor axis, in-plane rotation angle, and period.

[0034] In this embodiment of the invention, the micro-nano fabrication technology includes amorphous silicon coating process, electron beam exposure, and etching methods.

[0035] Specifically, the long and short axes of the nanopillars vary in the range of 200nm-500nm.

[0036] Specifically, the magneto-optical modulator 2 includes a first polarizer 21, a second polarizer 23, and a magneto-optical crystal 22; The magneto-optical crystal 22 is disposed between the first polarizer 21 and the second polarizer 23; The magneto-optical crystal 22 is surrounded by an external magnetic field, which is used to modulate the polarization state of idler photons.

[0037] Specifically, the single-photon detection imaging component 4 includes a single-photon camera 4241 and a single-photon camera; The single-photon camera 4241 acquires modulated idler photons from the magneto-optical modulator 2 and sends them to the single-photon camera; A single-photon camera acquires signal photons after interaction from metasurface structure 3; Non-reciprocal entangled holographic images are obtained based on modulated idler photons and interacting signal photons.

[0038] In this embodiment of the invention, due to the entanglement characteristics of photon pairs, changes in the polarization of idler photons correspondingly alter the polarization characteristics of signal photons. The polarization-modulated metasurface interacts with the signal photons, and a specific holographic image is acquired through a single-photon detection imaging element. Thus, different entangled holographic images can be acquired when entangled photon pairs are incident from the forward and reverse directions, such as... Figure 3 As shown.

[0039] This invention presents a non-reciprocal quantum entanglement holographic imaging device comprising a metasurface structure, a polarization entanglement photon pair generator, a magneto-optical modulator, and a single-photon detection imaging component. Idle photons generated by the polarization entanglement photon pair generator are transmitted to the magneto-optical modulator via an idler photon channel, where the modulator modulates the polarization state of the idler photons. Signal photons generated by the polarization entanglement photon pair generator are transmitted to the metasurface structure via a signal photon channel, where the metasurface structure interacts with the signal photons. The single-photon detection imaging component acquires a non-reciprocal entanglement holographic image from the magneto-optical modulator and the metasurface structure. Compared to existing technologies, this invention, by modulating the polarization state of the idler photons and pre-setting a polarization-modulated metasurface holographic image, can achieve non-reciprocal entanglement holographic imaging under both forward and reverse incident conditions of entangled photon pairs. It also suppresses backscatter noise by breaking time-reversal symmetry to achieve unidirectional imaging, thereby improving the quality of holographic imaging.

[0040] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A non-reciprocal quantum entanglement holographic imaging device, characterized in that, This includes metasurface structures, polarization entangled photon pair generators, magneto-optical modulators, and single-photon detection imaging components; A signal photon channel and an idler photon channel are formed between the polarization entangled photon pair generator and the single-photon detection imaging component; The metasurface structure is disposed in the signal photon channel; The magneto-optical modulator is disposed in the idler photonic channel; The idler photons generated by the polarization entangled photon pair generator are transmitted to the magneto-optical modulator through the idler photon channel, and the magneto-optical modulator modulates the polarization state of the idler photons; The signal photons generated by the polarization entangled photon pair generator are transmitted to the metasurface structure through the signal photon channel, and the metasurface structure interacts with the signal photons. The single-photon detection imaging component acquires non-reciprocal entangled holographic images from the magneto-optical modulator and the metasurface structure.

2. The non-reciprocal quantum entanglement holographic imaging device according to claim 1, characterized in that, The metasurface structure comprises multiple metasurface units arranged in an array, each metasurface unit including a substrate and a nanopillar, with the nanopillar positioned upright in the center of the substrate.

3. The non-reciprocal quantum entanglement holographic imaging device according to claim 2, characterized in that, The substrate of the metasurface constituent unit is quartz glass, and the nanopillars of the metasurface constituent unit are made of polycrystalline silicon.

4. The non-reciprocal quantum entanglement holographic imaging device according to claim 2, characterized in that, The fabrication process of the metasurface structure includes: Step 1: Acquire the target holographic image and use the holographic image phase retrieval algorithm to calculate the phase distribution map of the orthogonal polarization channels in the target holographic image; Step 2: The optical field transmission characteristics of nanopillars with different geometric dimensions are numerically calculated using the finite-difference time-domain method, and the structural parameters of the metasurface constituent units are determined based on the optical field transmission characteristics. Step 3: Scan the images of amplitude and phase changes with the size of the nanopillars using the structural parameters to obtain phase and amplitude maps; Step 4: Based on the phase distribution map of the signal photon channel, the phase map, and the amplitude map, find the metasurface constituent units that satisfy the structural size conditions pixel by pixel; Step 5: Generate a fabrication pattern based on the structural dimensions of each metasurface component, and fabricate the metasurface using the fabrication pattern and micro / nano fabrication technology to obtain the metasurface structure.

5. The non-reciprocal quantum entanglement holographic imaging device according to claim 4, characterized in that, The structural parameters of the nanopillars include height, major axis, minor axis, in-plane rotation angle, and period.

6. The non-reciprocal quantum entanglement holographic imaging device according to claim 5, characterized in that, The major and minor axes of the nanopillars vary in the range of 200 nm to 500 nm.

7. The non-reciprocal quantum entanglement holographic imaging device according to claim 1, characterized in that, The magneto-optic modulator includes a first polarizer, a second polarizer, and a magneto-optical crystal; The magneto-optical crystal is disposed between the first polarizer and the second polarizer; The magneto-optical crystal is surrounded by an external magnetic field, which is used to modulate the polarization state of idler photons.

8. The non-reciprocal quantum entanglement holographic imaging device according to claim 7, characterized in that, The single-photon detection and imaging assembly includes a scanning photocurrent microscope and a single-photon camera; The scanning photocurrent microscope acquires modulated idler photons from the magneto-optical modulator and sends them to the single-photon camera; The single-photon camera acquires the interacting signal photons from the metasurface structure; A non-reciprocal entangled holographic image is obtained based on the modulated idler photons and the signal photons after interaction.

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