Multi-channel quantum storage device and signal light processing method

Abstract

The present invention provides a multi-channel quantum storage device and a signal light processing method. The device comprises an optical generation module for generating signal light and pump light; an addressing and coding module for performing optical addressing and bit coding processing on the signal light to obtain coded photons, and transmitting the coded photons and pump light to the multi-channel storage module; an electrical generation module for generating an electrical pulse signal corresponding to the signal light according to a preset storage method; and a multi-channel storage module comprising a plurality of independent storage channels, wherein the multi-channel storage module is used to: based on the pump light and electrical pulse signal of the preset storage method, store the coded photons in the storage channels corresponding to the coded photons.

Description

Technical Field

[0001] The present invention relates to the field of quantum information technology, and more specifically, to a multi-channel quantum storage device and a signal light processing method. Background Art

[0002] In the field of optical quantum communication, due to inevitable fiber loss, the number of quantum bits transmitted through optical fiber will decay exponentially with distance, and due to the non-cloning of quantum states, the transmission distance cannot be increased by directly amplifying the signal. Currently, the longest ground-based quantum communication distance is limited to hundreds of kilometers.

[0003] In the process of implementing the concept of the present invention, it is found that there are at least the following problems in the related art: the storage fidelity of the existing quantum memory is poor and is not conducive to integration. Summary of the invention

[0004] In view of this, the present invention provides a multi-channel quantum storage device and a signal light processing method.

[0005] One aspect of the present invention provides a multi-channel quantum storage device, comprising:

[0006] A light generating module, used for generating signal light and pump light;

[0007] An addressing and encoding module, used for performing optical addressing and bit encoding processing on the signal light to obtain encoded photons, and transmitting the encoded photons and the pump light to a multi-channel storage module;

[0008] An electrical generating module, used for generating an electrical pulse signal corresponding to the above-mentioned signal light according to a preset storage method;

[0009] The multi-channel storage module comprises a plurality of independent storage channels, wherein the multi-channel storage module is used for:

[0010] Based on the above-mentioned pump light and the above-mentioned electrical pulse signal in the above-mentioned preset storage mode, the above-mentioned encoded photons are stored in the storage channel corresponding to the above-mentioned encoded photons.

[0011] According to an embodiment of the present invention, the light generating module comprises:

[0012] A laser for generating laser light;

[0013] A first modulator, used to modulate the laser to obtain the pump light;

[0014] The second modulator is used to modulate the laser to obtain the signal light.

[0015] According to an embodiment of the present invention, the multi-channel quantum storage device further includes:

[0016] The input optical fiber array is used to transmit the encoded photons output by the addressing encoding module and the pump light to the plurality of storage channels.

[0017] According to an embodiment of the present invention, the multi-channel storage module comprises:

[0018] Optical waveguide arrays;

[0019] At least two tapered waveguide arrays are formed on a first side and a second side opposite to the optical waveguide array, respectively.

[0020] According to an embodiment of the present invention, the multi-channel storage module further includes:

[0021] A surface electrode array is formed on a third side of the optical waveguide array, the surface electrode array is connected to the electrical generating module, wherein the surface electrode array includes a plurality of independent electrical waveguides;

[0022] Wherein, the above-mentioned multi-channel quantum storage device further includes:

[0023] The detection module is used to detect the quantum state of the encoded photons stored in the storage channel to implement a reading operation of the stored encoded photons.

[0024] According to an embodiment of the present invention, the optical waveguide array comprises:

[0025] Rare earth doped crystals;

[0026] A plurality of independent optical waveguides are arranged in an array on the rare earth doped crystal, wherein one of the independent optical waveguides is one of the storage channels;

[0027] According to an embodiment of the present invention, the tapered waveguide array comprises:

[0028] glass, disposed on one side of the rare earth-doped crystal;

[0029] A plurality of tapered waveguides are arranged in an array on the glass.

[0030] According to an embodiment of the present invention, based on a preset storage mode and the pump light, storing the encoded photons in a storage channel corresponding to the encoded photons includes:

[0031] Based on the preset storage method, the optical absorption band is prepared by using the pump light, and the encoded photons are stored in the storage channel according to the electrical pulse signal.

[0032] According to an embodiment of the present invention, based on the above-mentioned preset storage mode, the above-mentioned pump light is used to prepare an optical absorption band, and the above-mentioned encoded photons are stored in the above-mentioned storage channel according to the above-mentioned electrical pulse signal, including:

[0033] In the case where the preset storage mode is an electrically controlled atomic frequency comb mode, the optical absorption band is an absorption band of a frequency comb structure, and the electrical pulse signal is a pulsed electric field signal;

[0034] In the case where the preset storage mode is the atomic frequency comb mode of spin waves, the optical absorption band is the absorption band of the frequency comb structure, and the electrical pulse signal is a radio frequency magnetic field signal;

[0035] In the case where the preset storage mode is a noise-free photon echo mode, the optical absorption band is an absorption band of an isolated structure, and the electrical pulse signal is a radio frequency magnetic field signal;

[0036] The encoded photons are stored in the storage channel according to the optical absorption band and the electrical pulse signal.

[0037] Another aspect of the present invention provides a method for processing signal light, comprising:

[0038] Generate signal light and pump light using an optical generation module;

[0039] Using the electrical generating module to generate an electrical pulse signal corresponding to the signal light according to a preset storage method;

[0040] Performing optical addressing and bit encoding processing on the signal light by using an addressing and encoding module to obtain encoded photons, and transmitting the encoded photons and the pump light;

[0041] Based on the above-mentioned pump light and the above-mentioned electrical pulse signal of the above-mentioned preset storage method, the above-mentioned encoded photons are stored in the storage channel of the multi-channel storage module corresponding to the above-mentioned encoded photons, wherein the above-mentioned multi-channel storage module includes a plurality of storage channels independent of each other.

[0042] According to an embodiment of the present invention, the signal light processing method further includes:

[0043] The detection module is used to detect the quantum state of the encoded photons stored in the storage channel to implement a reading operation of the stored encoded photons.

[0044] According to an embodiment of the present invention, the multi-channel integrable solid-state quantum storage device of the present invention adopts a high-fidelity storage solution, can realize multi-channel quantum storage, can be used for high-fidelity storage based on path-coded quantum bits, or storage of high-dimensional path-coded quantum bits, and uses an integrated solution, which is convenient for large-scale expansion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0046] Figure 1 A schematic diagram of the structure of a multi-channel quantum storage device according to an embodiment of the present invention is shown;

[0047] Figure 2 A schematic diagram showing a specific structure of a multi-channel quantum storage device according to an embodiment of the present invention is shown;

[0048] Figure 3 A specific structural schematic diagram of a multi-channel storage module according to an embodiment of the present invention is shown;

[0049] Figure 4 A schematic diagram of a time series of an electrically controlled atomic frequency comb solution according to an embodiment of the present invention is shown;

[0050] Figure 5 A time series schematic diagram of a spin wave-based atomic frequency comb scheme according to an embodiment of the present invention is shown;

[0051] Figure 6 A schematic diagram of a time series based on a noise-free photon echo scheme according to an embodiment of the present invention is shown;

[0052] Figure 7 A flow chart of a method for processing signal light according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0053] Below, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present invention. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of embodiments of the present invention. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of concepts of the present invention.

[0054] The terms used herein are only for describing specific embodiments and are not intended to limit the present invention. The terms "comprise", "include", etc. used herein indicate the existence of the features, steps, operations and / or components, but do not exclude the existence or addition of one or more other features, steps, operations or components.

[0055] All terms (including technical and scientific terms) used herein have the meanings commonly understood by those skilled in the art unless otherwise defined. It should be noted that the terms used herein should be interpreted as having a meaning consistent with the context of this specification and should not be interpreted in an idealized or overly rigid manner.

[0056] When using expressions such as "at least one of A, B, and C, etc.", they should generally be interpreted according to the meaning of the expression commonly understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0057] In the process of realizing the concept of the present invention, it was found through research that quantum memory based on rare earth doped crystals has the advantages of high fidelity, large storage bandwidth, high multi-mode potential, and ultra-long storage life. In addition, due to the solid-state properties of rare earth doped crystals, it is very conducive to the preparation of integrated devices. Integration is conducive to expanding channel capacity and reducing device volume. Direct docking with optical fiber networks is also convenient for combination with other integrated optical devices. Multi-channel integrable quantum memory, on the one hand, can provide larger storage capacity, realize multi-mode quantum storage, and improve entanglement distribution efficiency; on the other hand, it can realize integrable storage of high-dimensional quantum states, which has important application value in the field of quantum information. In summary, the multi-channel integrable solid-state quantum storage device can be docked with an optical fiber network, and is a core device of an integrable multi-channel quantum repeater for practical development.

[0058] In view of this, the present invention provides a multi-channel quantum storage device and a signal light processing method, the device includes an optical generation module, which is used to generate signal light and pump light; an addressing and coding module, which is used to perform optical addressing and bit coding processing on the signal light to obtain coded photons, and transmit the coded photons and pump light to the multi-channel storage module; an electrical generation module, which is used to generate an electrical pulse signal corresponding to the signal light according to a preset storage method; and a multi-channel storage module, which includes multiple independent storage channels, wherein the multi-channel storage module is used to: based on the pump light and electrical pulse signal of the preset storage method, store the coded photons in the storage channel corresponding to the coded photons.

[0059] Figure 1FIG. 4 is a schematic structural diagram of a multi-channel quantum storage device according to an embodiment of the present invention.

[0060] like Figure 1 As shown, the multi-channel quantum storage device comprises:

[0061] A light generating module 12, used for generating signal light and pump light;

[0062] An addressing and encoding module 13, used for performing optical addressing and bit encoding processing on the signal light to obtain encoded photons, and transmitting the encoded photons and the pump light to a multi-channel storage module;

[0063] An electrical generating module 14, used for generating an electrical pulse signal corresponding to the signal light according to a preset storage method;

[0064] The multi-channel storage module 11 includes a plurality of independent storage channels, wherein the multi-channel storage module 11 is used for:

[0065] Based on the pump light and the electrical pulse signal of the preset storage mode, the encoded photons are stored in a storage channel corresponding to the encoded photons.

[0066] According to an embodiment of the present invention, the addressing and encoding module 13 may be a laser addressing and encoding module, and its bit encoding method may include path, Time-bin, etc.

[0067] According to an embodiment of the present invention, the preset storage method should support high-fidelity, on-demand, and integrable quantum bit storage, such as electrically controlled atomic frequency comb method, spin wave atomic frequency comb method, and noise-free photon echo method.

[0068] According to an embodiment of the present invention, the electrical generating module 14 may be an arbitrary waveform generator or a vector microwave signal source, which is used to generate the electrical pulse signal required by the multi-channel storage module 11 based on multiple independent storage channels.

[0069] According to an embodiment of the present invention, the optical generating module 12 generates the pump light required by the multi-channel storage module 11 based on multiple independent storage channels, and simultaneously generates the signal light to be optically addressed and encoded, and transmits the pump light and the signal light to the addressing and encoding module 13.

[0070] According to an embodiment of the present invention, the addressing encoding module 13 transmits the pump light to each storage channel of the multi-channel storage module 11 based on multiple independent storage channels, bit-encodes the signal light, and transmits the encoded photons to the multi-channel storage module 11. The electrical generating module 14 generates the electrical pulse signal required by the multi-channel storage module 11, and outputs the electrical pulse signal to the multi-channel storage module 11.

[0071] According to an embodiment of the present invention, the multi-channel storage module 11 can be prepared on a structure composed of glass-rare earth doped crystal-glass, and the structure can be efficiently coupled with the optical fiber array, so that the multi-channel storage module 11 can use the pump light to store the encoded photons in the storage channel corresponding to the encoded photons according to a preset storage method.

[0072] According to an embodiment of the present invention, the multi-channel integrable solid-state quantum storage device of the present invention adopts a high-fidelity storage solution, can realize multi-channel quantum storage, can be used for high-fidelity storage based on path-coded quantum bits, or storage of high-dimensional path-coded quantum bits, and uses an integrated solution, which is convenient for large-scale expansion and application.

[0073] Figure 2 A specific structural schematic diagram of a multi-channel quantum storage device according to an embodiment of the present invention is shown.

[0074] like Figure 2 As shown in (a), the light generating module 12 includes:

[0075] A laser 121, used to generate a laser with a line width within a specified range, wherein the specified range may refer to a line width below 10 kHz;

[0076] A first modulator 122, used for modulating the laser to obtain the pump light;

[0077] The second modulator 123 is used to modulate the laser to obtain the signal light.

[0078] According to an embodiment of the present invention, the first modulator 122 may be an acousto-optic modulator with a center frequency of 200 MHz. The second modulator 123 may be an acousto-optic modulator with a center frequency of 200 MHz.

[0079] According to an embodiment of the present invention, the first modulator 122 modulates the laser to generate the pump light required by the multi-channel storage module 11 based on multiple independent storage channels, and outputs the pump light to the addressing and coding module 13; the second modulator 123 modulates the laser to generate the signal light to be addressed and encoded, and outputs the signal light to the addressing and coding module 13.

[0080] like Figure 2 As shown in (a), the multi-channel quantum storage device also includes:

[0081] The input optical fiber array 132 is used to transmit the encoded photons output by the addressing encoding module 13 and the pump light to the multiple storage channels.

[0082] According to an embodiment of the present invention, the addressing and encoding module 13 outputs the pump light to each storage channel of the multi-channel storage module 11, and at the same time encodes the signal light generated by the light generating module 12, and outputs the encoded photons to the multi-channel storage module 11. The addressing and encoding module 13 is composed of an acousto-optic deflector, and the acousto-optic deflector with a center frequency of 85 MHz can be selected.

[0083] According to an embodiment of the present invention, the specific process of pump light addressing is as follows: by changing the frequency of the RF signal applied to the acousto-optic deflector, the deflection direction of the output light can be changed, corresponding to different output channels, so that the pump light is transmitted to each storage channel of the multi-channel storage module 11. In addition, RF pulses of multiple frequencies can be superimposed to achieve simultaneous addressing of multiple storage channels.

[0084] According to an embodiment of the present invention, the specific process of signal light path encoding is: by applying radio frequency signals of different frequencies and phases to the acousto-optic deflector, the signal light can be prepared into photons with different path encodings, such as the path quantum state P 116 , P 118 , P 120 , P 116 +P 118 , P 116 +iP 118 , P 116 +P 118 +P 120 wait.

[0085] According to an embodiment of the present invention, the input optical fiber array 132 connects the addressing encoding module 13 and each storage channel of the multi-channel storage module 11 .

[0086] like Figure 2 As shown, the multi-channel storage module 11 includes:

[0087] Optical waveguide array 111;

[0088] At least two tapered waveguide arrays 112 are formed on a first side and a second side opposite to each other of the optical waveguide array 111 .

[0089] According to an embodiment of the present invention, the tapered optical waveguide array 111 includes a plurality of independent tapered optical waveguides arranged in parallel. The number of tapered waveguide arrays 112 of the present invention is 2, which are respectively located on both sides of the optical waveguide array 111. One is used to adiabatically convert the output light mode field of the addressing coding module 13 through the input optical fiber array 132 into the mode field of the optical waveguide array 111, and the other is used to adiabatically convert the output mode field of the optical waveguide array 111 into the mode field of the output optical fiber array, so as to facilitate detection by the detection module 15.

[0090] like Figure 2 As shown in (c), the multi-channel storage module 11 further includes:

[0091] A surface electrode array 113 is formed on a third side of the optical waveguide array 111, and the surface electrode array 113 is connected to the electrical generating module 14, wherein the surface electrode array 113 includes a plurality of independent electrical waveguides 1131;

[0092] like Figure 1 As shown, the multi-channel quantum storage device also includes:

[0093] The detection module 15 is used to detect the quantum state of the encoded photons stored in the storage channel to implement a reading operation of the stored encoded photons.

[0094] According to an embodiment of the present invention, the surface electrode array 113 includes a plurality of independent electrical waveguides 1131 arranged in parallel, and the spacing between two adjacent electrical waveguides may be 200-400 um, for generating a local electric field signal covering a single optical waveguide.

[0095] According to an embodiment of the present invention, the detection module 15 includes the above-mentioned output optical fiber array 151 and a photon state detection unit 152 .

[0096] According to an embodiment of the present invention, the output fiber array 151 connects the multi-channel storage module 11 and the photon state detection unit. The photon state detection unit realizes the projection measurement of the photon 1605 after the readout path encoding, and obtains the fidelity of the photon 1605. The photon state detection unit 152 is composed of an acousto-optic deflector, and the acousto-optic deflector with a center frequency of 85 MHz can be selected.

[0097] According to an embodiment of the present invention, the specific path state measurement process of the detection module 15 is: applying radio frequency signals of different frequencies and phases to the acousto-optic deflector to achieve projection measurement of quantum states of different paths, for example, P 116 , P 118 , P 120 , P 116 +P 118 , P 116+iP 118 , P 116 +P 118 +P 120 Etc., and at the same time, it can compensate for the frequency offset of photons in different paths brought by the coded acousto-optic deflector and obtain the photon 1605 fidelity.

[0098] Figure 3 A specific structural schematic diagram of a multi-channel storage module according to an embodiment of the present invention is shown.

[0099] like Figure 2 (b) and Figure 3 As shown, the optical waveguide array 111 includes:

[0100] Rare earth doped crystal 1122;

[0101] A plurality of independent optical waveguides 1124 arranged in parallel are arranged in an array on the rare earth-doped crystal 1122, wherein one independent optical waveguide 1124 is one storage channel, and the spacing between two adjacent independent optical waveguides 1124 can be 200-400um. A single independent optical waveguide 1124 corresponds to a single storage path and binds the photons of the path.

[0102] like Figure 3 As shown, the tapered waveguide array 112 includes:

[0103] Glass 1121, disposed on one side of the rare earth doped crystal 1122;

[0104] A plurality of tapered waveguides 1123 are arranged in an array on the glass 1121 .

[0105] According to an embodiment of the present invention, see Figure 3 The structure of an optical storage channel of the multi-channel storage module 11 is composed of a glass 1121 and a rare-earth-doped crystal 1122, wherein an independent optical waveguide 1124 is processed on the surface of the rare-earth-doped crystal 1122, and a tapered waveguide 1123 is processed on the surface of the glass 1121, which is used to realize the adiabatic conversion of the optical fiber mode field to the mode field of the independent optical waveguide 1124 in the rare-earth-doped crystal 1122.

[0106] According to an embodiment of the present invention, the rare earth doped crystal 1122 can be purified by isotope purification with a concentration of 0.1%. 151 Eu 3+ The doped YSO crystal, 15 mm in length, is used as the storage medium; the glass 1121 uses BK-7 optical glass, 5 mm in length.

[0107] According to an embodiment of the present invention, the independent optical waveguide 1124 is a type III waveguide processed by a femtosecond direct writing device and has a size of 20um. The independent electrical waveguide 1131 is composed of three parallel metal electrodes and is prepared on the surface of the rare earth-doped crystal 1122 by ultraviolet lithography and electron beam evaporation. The spacing between the surface electrode array 113 and the optical waveguide array 111 can be in the range of 20-30um.

[0108] According to an embodiment of the present invention, the multi-channel storage module 11 needs to be cooled to a temperature of about 3K to ensure that its optical transition has a long coherence time. Specifically, the multi-channel storage module 11 based on the optical waveguide array 111 can be placed in a low-temperature cavity for operation, and the low-temperature cavity is cooled by a liquid helium compressor to cool the multi-channel storage module 11 to about 3K.

[0109] According to an embodiment of the present invention, based on a preset storage mode and the pump light, storing the encoded photons in a storage channel corresponding to the encoded photons includes:

[0110] Based on the preset storage mode, the pump light is used to prepare an optical absorption band, and the encoded photons are stored in the storage channel according to the electrical pulse signal.

[0111] Figure 4 A time series schematic diagram of an electrically controlled atomic frequency comb scheme according to an embodiment of the present invention is shown. Figure 5 A time series schematic diagram of a spin wave-based atomic frequency comb scheme according to an embodiment of the present invention is shown. Figure 6 A schematic diagram of a time series based on a noise-free photon echo solution according to an embodiment of the present invention is shown.

[0112] According to an embodiment of the present invention, based on the preset storage mode, using the pump light to prepare an optical absorption band, and storing the encoded photons in the storage channel according to the electrical pulse signal, includes:

[0113] In the case where the preset storage mode is an electrically controlled atomic frequency comb mode, the optical absorption band is an absorption band of a frequency comb structure, and the electrical pulse signal is a pulsed electric field signal;

[0114] In the case where the preset storage mode is a spin wave atomic frequency comb mode, the optical absorption band is an absorption band of a frequency comb structure, and the electrical pulse signal is a radio frequency magnetic field signal;

[0115] In the case where the preset storage mode is a noise-free photon echo mode, the optical absorption band is an absorption band of an isolated structure, and the electrical pulse signal is a radio frequency magnetic field signal;

[0116] The encoded photons are stored in the storage channel according to the optical absorption band and the electrical pulse signal.

[0117] According to an embodiment of the present invention, when the electrically controlled atomic frequency comb mode is selected, the time series is stored as follows: Figure 4 The specific operation steps are as follows: the pump light 1601 generated by the optical generation module 12 is output to each storage channel of the multi-channel storage module 11 through the addressing and encoding module 13, and a frequency comb absorption band is prepared in the storage channel; the signal light generated by the optical generation module 12 is encoded by the addressing and encoding module 13, and then the encoded photon 1602 is output to the multi-channel storage module 11; the electrical generation module 14 generates a first electrical pulse signal 1603, and outputs it to the multi-channel storage module 11 at time T / 2; the electrical generation module 14 generates a second electrical pulse signal 1604, and outputs it to the multi-channel storage module 11 at times 3T / 2, 5T / 3..., and photons 1605 can be read out at times 2T, 3T...; the detection module 15 performs quantum state projection measurement on the read photons 1605 and obtains fidelity.

[0118] According to an embodiment of the present invention, when the spin wave atomic frequency comb mode is selected, the time series is stored as follows: Figure 5 The detailed operation steps are as follows: the pump light 1701 generated by the light generating module 12 is output to each storage channel of the multi-channel storage module 11 through the addressing and encoding module 13, and a frequency comb absorption band is prepared in the storage channel; the signal light generated by the light generating module 12 is encoded by the addressing and encoding module 13, and then the encoded photons 1702 are output to the multi-channel storage module 11; the light generating module 12 generates a control light pulse 1703 (i.e., an electrical pulse signal), which is input into the waveguide-based multi-channel storage module 11 to realize the transfer from the optical excited state to the nuclear spin state; the electrical generating module 14 generates a series of radio frequency magnetic field pulses 1704 with a duration of TS, and inputs them into the multi-channel storage module to realize dynamic decoupling; the light generating module 12 generates a control light pulse 1705 and inputs it into the multi-channel storage module 11 to realize the transfer from the nuclear spin state to the optical excited state, and at T+T s The photon 1706 is read out at a certain moment; the detection module 15 performs quantum state projection measurement on the read-out photon 1706 and obtains the fidelity.

[0119] According to an embodiment of the present invention, when the noise-free photon echo storage mode is selected, the storage time series is as follows: Figure 6The detailed operation steps are as follows: the pump light 1801 generated by the light generating module 12 is output to each storage channel of the multi-channel storage module 11 through the addressing and encoding module 13, and an absorption band of an isolated structure is prepared in the storage channel; the signal light generated by the light generating module 12 is encoded by the addressing and encoding module 13, and then the encoded photon 1802 is output to the multi-channel storage module 11; the light generating module 12 generates a control light pulse 1803, which is input into the multi-channel storage module 11 to realize the transfer from the optical excited state to the nuclear spin state; the electrical generating module 14 generates a series of radio frequency magnetic field pulses 1804, which are input into the multi-channel storage module to realize dynamic decoupling; the light generating module 12 generates control light pulses 1805, 1806 and 1807, which are input into the multi-channel storage module 11 to realize the transfer from the nuclear spin state to the optical excited state, and read out the photon 1808; the detection module 15 performs quantum state projection measurement on the read-out photon 1808 and obtains the fidelity.

[0120] Figure 7 A flow chart of a method for processing signal light according to an embodiment of the present invention is shown.

[0121] like Figure 7 As shown, the method for processing signal light includes operations S701 to S704.

[0122] In operation S701, a signal light and a pump light are generated by using a light generating module;

[0123] In operation S702, an electrical pulse signal corresponding to the signal light is generated by using an electrical generating module according to a preset storage method;

[0124] In operation S703, the signal light is optically addressed and bit-encoded by using an addressing and coding module to obtain coded photons, and the coded photons and pump light are transmitted;

[0125] In operation S704, based on the pump light and electrical pulse signal of the preset storage mode, the encoded photons are stored in a storage channel of a multi-channel storage module corresponding to the encoded photons, wherein the multi-channel storage module includes a plurality of independent storage channels.

[0126] According to an embodiment of the present invention, the multi-channel integrable solid-state quantum storage device of the present invention adopts a high-fidelity storage solution, can realize multi-channel quantum storage, can be used for high-fidelity storage based on path-coded quantum bits, or storage of high-dimensional path-coded quantum bits, and uses an integrated solution, which is convenient for large-scale expansion and application.

[0127] According to an embodiment of the present invention, the signal light processing method further includes:

[0128] The detection module is used to detect the quantum state of the encoded photons stored in the storage channel to implement a reading operation of the stored encoded photons.

[0129] It should be noted that the signal light processing method in the embodiment of the present invention corresponds to the multi-channel quantum storage device in the embodiment of the present invention. The description of the signal light processing method specifically refers to the multi-channel quantum storage device part, which will not be repeated here.

[0130] The embodiments of the present invention have been described above. However, these embodiments are only for the purpose of illustration, and are not intended to limit the scope of the present invention. Although each embodiment has been described above, this does not mean that the measures in each embodiment cannot be advantageously used in combination. The scope of the present invention is limited by the attached embodiments and their equivalents. Without departing from the scope of the present invention, those skilled in the art may make various substitutions and modifications, which should all fall within the scope of the present invention.

Claims

1. A multi-channel quantum storage device, characterized in that: include: A light generating module, used for generating signal light and pump light; An addressing and encoding module, used for performing optical addressing and bit encoding processing on the signal light to obtain encoded photons, and transmitting the encoded photons and the pump light to a multi-channel storage module; An electrical generating module, used for generating an electrical pulse signal corresponding to the signal light according to a preset storage method; The multi-channel storage module includes a plurality of independent storage channels, wherein the multi-channel storage module is used for: Based on the pump light and the electrical pulse signal of the preset storage mode, storing the encoded photons in a storage channel corresponding to the encoded photons; Wherein, the multi-channel storage module comprises: An optical waveguide array comprising: Rare earth doped crystals; A plurality of independent optical waveguides are arranged in an array on the rare earth doped crystal, wherein one independent optical waveguide is one storage channel; At least two tapered waveguide arrays are formed on opposite first and second sides of the optical waveguide array, respectively, the tapered waveguide array is used to adiabatically convert the output light mode field of the addressing coding module through the input optical fiber array into the mode field of the optical waveguide array, and is also used to adiabatically convert the output mode field of the optical waveguide array into the mode field of the output optical fiber array, the tapered waveguide array comprises: glass, disposed on one side of the rare earth-doped crystal; A plurality of tapered waveguides are arranged in an array on the glass.

2. The device according to claim 1, characterized in that The light generating module comprises: A laser for generating laser light; A first modulator, used for modulating the laser to obtain the pump light; The second modulator is used to modulate the laser to obtain the signal light.

3. The device according to claim 1, characterized in that Also includes, The input optical fiber array is used to transmit the encoded photons output by the addressing encoding module and the pump light to the multiple storage channels.

4. The device according to claim 1, characterized in that The multi-channel storage module also includes: A surface electrode array is formed on a third side of the optical waveguide array, the surface electrode array is connected to the power generating module, wherein the surface electrode array includes a plurality of independent electrical waveguides; Wherein, the multi-channel quantum storage device further comprises: The detection module is used to detect the quantum state of the encoded photons stored in the storage channel to implement a reading operation of the stored encoded photons.

5. The device according to claim 1, characterized in that Based on a preset storage mode and the pump light, storing the encoded photons in a storage channel corresponding to the encoded photons includes: Based on the preset storage mode, the pump light is used to prepare an optical absorption band, and the encoded photons are stored in the storage channel according to the electrical pulse signal.

6. The device according to claim 5, characterized in that Based on the preset storage mode, the pump light is used to prepare an optical absorption band, and the encoded photons are stored in the storage channel according to the electrical pulse signal, including: In the case where the preset storage mode is an electrically controlled atomic frequency comb mode, the optical absorption band is an absorption band of a frequency comb structure, and the electrical pulse signal is a pulsed electric field signal; In the case where the preset storage mode is a spin wave atomic frequency comb mode, the optical absorption band is an absorption band of a frequency comb structure, and the electrical pulse signal is a radio frequency magnetic field signal; In the case where the preset storage mode is a noise-free photon echo mode, the optical absorption band is an absorption band of an isolated structure, and the electrical pulse signal is a radio frequency magnetic field signal; The encoded photons are stored in the storage channel according to the optical absorption band and the electrical pulse signal.

7. A method for processing signal light, characterized in that: include: Generate signal light and pump light using an optical generation module; Using an electrical generating module to generate an electrical pulse signal corresponding to the signal light according to a preset storage method; Performing optical addressing and bit encoding processing on the signal light by using an addressing and encoding module to obtain encoded photons, and transmitting the encoded photons and the pump light; Based on the pump light and the electrical pulse signal of the preset storage mode, storing the encoded photons in a storage channel of a multi-channel storage module corresponding to the encoded photons, wherein the multi-channel storage module includes a plurality of storage channels independent of each other; Wherein, the multi-channel storage module comprises: An optical waveguide array comprising: Rare earth doped crystals; A plurality of independent optical waveguides are arranged in an array on the rare earth doped crystal, wherein one independent optical waveguide is one storage channel; At least two tapered waveguide arrays are formed on opposite first and second sides of the optical waveguide array, respectively, the tapered waveguide array is used to adiabatically convert the output light mode field of the addressing coding module through the input optical fiber array into the mode field of the optical waveguide array, and is also used to adiabatically convert the output mode field of the optical waveguide array into the mode field of the output optical fiber array, the tapered waveguide array comprises: glass, disposed on one side of the rare earth-doped crystal; A plurality of tapered waveguides are arranged in an array on the glass.

8. The method according to claim 7, characterized in that Also includes: The detection module is used to detect the quantum state of the encoded photons stored in the storage channel to implement a reading operation of the stored encoded photons.

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