Quantum teleportation and optical communication system common fiber transmission device and method

Abstract

The invention discloses a common-fiber transmission device of a quantum teleportation and optical communication system, which is characterized in that an optical communication transmitting device and a quantum information transmitting device are connected with a first wavelength division multiplexer, and the first wavelength division multiplexer, a second wavelength division multiplexer, a third wavelength division multiplexer and a fourth wavelength division multiplexer are connected in sequence; the second wavelength division multiplexer and the third wavelength division multiplexer are respectively connected with the Bell state detection device, the optical communication receiving device is connected with the fourth wavelength division multiplexer, the quantum entanglement light source is respectively connected with the fourth wavelength division multiplexer and the quantum information receiving device, and the Bell state detection device sends a measurement result to the quantum information receiving device through a channel. And the quantum state information to be transmitted is demodulated. The wavelength division multiplexer is used for completing uploading and downloading of classical / quantum signals, and high-speed classical optical communication and quantum teleportation are completed at the same time under the condition that one optical fiber transmits the classical and quantum signals at the same time.

Description

Technical Field

[0001] The present invention belongs to the field of quantum information science and relates to a quantum teleportation and optical communication system co-fiber transmission device and method. Background Art

[0002] With the help of quantum physics resources, quantum information technology can provide people with information acquisition, transmission and processing technologies that go beyond classical physics. Its ultimate development goal is to establish a quantum Internet, or quantum network. One of the key tasks to achieve the quantum Internet is to complete the transmission of quantum information between different quantum nodes. With the help of quantum entanglement resources, with the assistance of quantum projection measurement and classical communication, quantum teleportation can "transmit unknown quantum information away from the object".

[0003] Compared with free-space channels, fiber channels have the advantages of being unaffected by external environmental interference and being able to work around the clock. Researchers have achieved metropolitan-scale quantum teleportation in optical fibers, but the above achievements have all been achieved in dedicated fiber channels. From a practical point of view, the bandwidth capacity of existing optical communication infrastructure is far from saturation, and the co-fiber transmission of quantum and classical signals is conducive to the large-scale application of quantum Internet. Although the co-fiber transmission of quantum and classical signals has made many advances in the fields of quantum key distribution and quantum entanglement distribution, research schemes for the coexistence of quantum teleportation and optical communication systems have not yet been reported. Therefore, it is urgent to develop a method and device that enables high-speed classical optical communication and quantum teleportation to be transmitted on the same fiber. Summary of the invention

[0004] (I) Purpose of the invention

[0005] The purpose of the present invention is to provide a quantum teleportation and optical communication system co-fiber transmission device and method in view of the limited existing quantum Internet dedicated optical fiber resources.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a quantum teleportation and optical communication system co-fiber transmission device, which includes: an optical communication transmitting device 1, a quantum information transmitting device 2, a first wavelength division multiplexer 3, a second wavelength division multiplexer 4, a third wavelength division multiplexer 5, a fourth wavelength division multiplexer 6, a Bell state detection device 7, an optical communication receiving device 8, a quantum entangled light source 9 and a quantum information receiving device 10; the optical communication transmitting device 1 and the quantum information transmitting device 2 are connected to the first wavelength division multiplexer 3, the first wavelength division multiplexer 3, the second wavelength division multiplexer 4, the third wavelength division multiplexer 5 and the fourth wavelength division multiplexer 6 are connected in sequence, the second wavelength division multiplexer 4 and the third wavelength division multiplexer 5 are respectively connected to the Bell state detection device 7, the optical communication receiving device 8 is connected to the fourth wavelength division multiplexer 6, the quantum entangled light source 9 is respectively connected to the fourth wavelength division multiplexer 6 and the quantum information receiving device 10, and the Bell state detection device 7 sends the measurement result to the quantum information receiving device 10 through a channel, and then demodulates the quantum state information to be transmitted.

[0008] The optical communication transmitting device 1 is a continuous laser or a pulsed laser, which is any one of a solid laser, a gas laser, a semiconductor laser and a dye laser.

[0009] Among them, the quantum information transmitting device 2 is any one of a weak coherent single photon source, a propagation single photon source and a quantum dot single photon source.

[0010] The first wavelength division multiplexer 3, the second wavelength division multiplexer 4, the third wavelength division multiplexer 5 and the fourth wavelength division multiplexer 6 are any one of arrayed waveguide gratings, dense wavelength division multiplexers and tunable bandpass filters.

[0011] The Bell state detection device 7 may adopt either a linear optical scheme or a nonlinear optical scheme.

[0012] The optical communication receiving device 8 is any one of a photodiode, a PIN diode and an avalanche diode.

[0013] The quantum entangled light source 9 is any one of spontaneous four-wave mixing and spontaneous parametric down-conversion.

[0014] The quantum information receiving device 10 uses any one of a photomultiplier tube, an avalanche diode or a superconducting nanowire detector.

[0015] Among them, the optical communication transmitting device 1 uses a PPCL300 continuous semiconductor laser with a line width of 10kHz and a pump wavelength set to 1540.56nm; the quantum information transmitting device 2 uses a weak coherent single photon source, encoded by a time slice method, with a wavelength of 1549.16nm; the first wavelength division multiplexer 3, the second wavelength division multiplexer 4, the third wavelength division multiplexer 5 and the fourth wavelength division multiplexer 6 use dense wavelength division multiplexers with a 3dB bandwidth of 100GHz and an insertion loss of 1.5dB; the Bell state detection device 7 uses a linear optical scheme to project the quantum state onto |ψ with a probability of 1 / 4 - >; The optical communication receiving device 8 uses an S155C indium gallium arsenide photodiode with a wavelength response range of 800-1700nm and an optical power detection range of 1nW-20mW; the quantum entangled light source 9 uses a periodically polarized lithium niobate waveguide to generate a quantum entangled light source with a bandwidth of 10GHz through spontaneous parametric down-conversion and filtering, wherein the central wavelength of the signal photon is 1531.87nm and the central wavelength of the idler photon is 1549.16nm; the quantum information receiving device 10 uses a P-CS-16 superconducting nanowire detector with a single photon detection efficiency ≥85%, a dark count ≤50Hz, and a saturation count rate ≥3MHz.

[0016] The present invention also provides a method for co-fiber transmission of quantum teleportation and optical communication system, which comprises the following steps:

[0017] S1: using the optical communication transmitting device 1 to transmit a classical optical communication signal;

[0018] S2: The quantum information transmitting device 2 generates the quantum state to be transmitted, and uses a weak coherent state single photon source or a declared single photon source for encoding, and the encoding degree of freedom is polarization / time slice / path dimension;

[0019] S3: The classical optical signal and the quantum state signal are combined by the first wavelength division multiplexer 3, and after long-distance optical fiber transmission, the two signals are downloaded by the first wavelength division multiplexer 4, wherein the quantum signal is transmitted to the first wavelength division multiplexer 5 through the optical fiber and downloaded by the first wavelength division multiplexer 6, and then the classical optical communication transmission and reception is completed by the optical communication receiving device 8 of the first wavelength division multiplexer 6;

[0020] S4: After the entangled photon pair is generated by the quantum entangled light source 9, the signal photon is sent to the quantum information receiving device 10, and the idler photon passes through the first wavelength division multiplexer 6, passes through the long-distance optical fiber, and then passes through the first wavelength division multiplexer 5 to complete the quantum signal download, and completes the Bell state detection with the quantum signal downloaded by the first wavelength division multiplexer 4. The detection result is sent to the quantum information receiving device 10 to complete the quantum teleportation.

[0021] (III) Beneficial effects

[0022] The quantum teleportation and optical communication system co-fiber transmission device and method provided by the above technical solution have the following beneficial effects:

[0023] (1) The optical communication transmitting device transmits classical optical signals, and the quantum information transmitting device generates quantum signals. The signals are uploaded through a wavelength division multiplexer, and after long-distance optical fiber transmission, they are downloaded through a wavelength division multiplexer to complete classical optical communication detection. At the same time, the entangled photons prepared by the quantum entangled light source are uploaded and downloaded through a wavelength division multiplexer to complete Bell state detection, and after transmission, quantum state demodulation is completed.

[0024] (2) Use wavelength division multiplexers to upload and download classical / quantum signals, and simultaneously complete high-speed classical optical communication and quantum teleportation by transmitting classical and quantum signals on one optical fiber.

[0025] (3) All optical devices used in the device of the present invention are mature commercial devices, which is conducive to the assembly and debugging of the system and the development of practical applications.

[0026] (4) The present invention has the advantages of scalability and can be specifically used in quantum Internet fields such as metropolitan quantum teleportation.

[0027] (5) The method and device of the present invention are easy to assemble, highly flexible, and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the co-fiber transmission device of the quantum teleportation and optical communication system of the present invention. DETAILED DESCRIPTION

[0029] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples.

[0030] like Figure 1As shown, the quantum teleportation and optical communication system co-fiber transmission device of this embodiment includes an optical communication transmitting device 1, a quantum information transmitting device 2, a first wavelength division multiplexer 3, a second wavelength division multiplexer 4, a third wavelength division multiplexer 5, a fourth wavelength division multiplexer 6, a Bell state detection device 7, an optical communication receiving device 8, a quantum entangled light source 9 and a quantum information receiving device 10; the optical communication transmitting device 1 and the quantum information transmitting device 2 are connected to the first wavelength division multiplexer 3, the first wavelength division multiplexer 3, the second wavelength division multiplexer 4, the third wavelength division multiplexer 5 and the fourth wavelength division multiplexer 6 are connected in sequence, the second wavelength division multiplexer 4 and the third wavelength division multiplexer 5 are respectively connected to the Bell state detection device 7, the optical communication receiving device 8 is connected to the fourth wavelength division multiplexer 6, the quantum entangled light source 9 is respectively connected to the fourth wavelength division multiplexer 6 and the quantum information receiving device 10, and the Bell state detection device 7 sends the measurement result to the quantum information receiving device 10 through the channel, and then demodulates the quantum state information to be transmitted.

[0031] In the above embodiment, the optical communication transmitting device 1 is a continuous laser or a pulsed laser, which can be any one of a solid laser, a gas laser, a semiconductor laser and a dye laser. This embodiment uses a PPCL300 continuous semiconductor laser with a line width of 10kHz and a pump wavelength set to 1540.56nm.

[0032] The quantum information transmitting device 2 is any one of a weak coherent single photon source, a propagation single photon source and a quantum dot single photon source. This embodiment uses a weak coherent single photon source, encoded by a time slice method, and has a wavelength of 1549.16nm.

[0033] The first wavelength division multiplexer 3, the second wavelength division multiplexer 4, the third wavelength division multiplexer 5 and the fourth wavelength division multiplexer 6 are any one of arrayed waveguide grating, dense wavelength division multiplexer and adjustable bandpass filter. This embodiment uses a dense wavelength division multiplexer with a 3dB bandwidth of 100GHz and an insertion loss of 1.5dB.

[0034] The Bell state detection device 7 can adopt any one of the linear optical scheme or the nonlinear optical scheme. This embodiment uses the linear optical scheme to project the quantum state onto |ψ - >.

[0035] The optical communication receiving device 8 is any one of a photodiode, a PIN diode and an avalanche diode. In this embodiment, an S155C indium gallium arsenide photodiode is used, with a wavelength response range of 800-1700nm and an optical power detection range of 1nW-20mW.

[0036] The quantum entangled light source 9 is any one of spontaneous four-wave mixing and spontaneous parametric down conversion. In this embodiment, a periodically polarized lithium niobate waveguide is used to generate a quantum entangled light source with a bandwidth of 10 GHz by spontaneous parametric down conversion and filtering, wherein the central wavelength of the signal photon is 1531.87 nm and the central wavelength of the idler photon is 1549.16 nm.

[0037] The quantum information receiving device 10 uses any one of a photomultiplier tube, an avalanche diode or a superconducting nanowire detector. This embodiment uses a P-CS-16 superconducting nanowire detector with a single photon detection efficiency of ≥85%, a dark count of ≤50Hz, and a saturation count rate of ≥3MHz.

[0038] Based on the above-mentioned co-fiber transmission device, the co-fiber transmission method of quantum teleportation and optical communication system in this embodiment includes the following steps:

[0039] Transmitting a classical optical communication signal using an optical communication transmitting device 1;

[0040] The quantum information transmitting device 2 generates a quantum state to be transmitted, wherein a weak coherent state single photon source, a declared single photon source, etc. can be used for encoding, and the encoding degree of freedom can be polarization / time slice / path and other dimensions;

[0041] The classical optical signal and the quantum state signal are combined by the first wavelength division multiplexer 3, and after long-distance optical fiber transmission, the two signals are downloaded by the first wavelength division multiplexer 4, wherein the quantum signal is transmitted to the first wavelength division multiplexer 5 through the optical fiber and downloaded by the first wavelength division multiplexer 6, and then the optical communication receiving device 8 of the first wavelength division multiplexer 6 completes the classical optical communication transmission and reception;

[0042] After the entangled photon pair is generated by the quantum entangled light source 9, the signal photon is sent to the quantum information receiving device 10, and the idler photon passes through the first wavelength division multiplexer 6, passes through the long-distance optical fiber, and then passes through the first wavelength division multiplexer 5 to complete the quantum signal download, and completes the Bell state detection with the quantum signal downloaded by the first wavelength division multiplexer 4. The detection result is sent to the quantum information receiving device 10 to complete the quantum teleportation.

[0043] It can be seen from the above technical scheme that the present invention uses a wavelength division multiplexing device to transmit classical / quantum signals on a common fiber, and realizes quantum teleportation while completing classical optical communication. The method and device for co-fiber transmission of quantum teleportation and optical communication system designed by the present invention have the advantages of scalability and low cost, and can be applied to the field of quantum Internet. Moreover, the devices used in the present invention can all adopt existing mature optical fiber communication devices, which have high practicality.

[0044] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A quantum teleportation and optical communication system co-fiber transmission device, characterized in that: include: An optical communication transmitting device (1), a quantum information transmitting device (2), a first wavelength division multiplexer (3), a second wavelength division multiplexer (4), a third wavelength division multiplexer (5), a fourth wavelength division multiplexer (6), a Bell state detection device (7), an optical communication receiving device (8), a quantum entangled light source (9) and a quantum information receiving device (10); the optical communication transmitting device (1) and the quantum information transmitting device (2) are connected to the first wavelength division multiplexer (3); the first wavelength division multiplexer (3), the second wavelength division multiplexer (4), the third wavelength division multiplexer (5), the fourth wavelength division multiplexer (6), a Bell state detection device (7), an optical communication receiving device (8), a quantum entangled light source (9) and a quantum information receiving device (10); The three wavelength division multiplexers (5) and the fourth wavelength division multiplexer (6) are connected in sequence, the second wavelength division multiplexer (4) and the third wavelength division multiplexer (5) are respectively connected to the Bell state detection device (7), the optical communication receiving device (8) is connected to the fourth wavelength division multiplexer (6), the quantum entangled light source (9) is respectively connected to the fourth wavelength division multiplexer (6) and the quantum information receiving device (10), the Bell state detection device (7) sends the measurement result to the quantum information receiving device (10) through the channel, and then demodulates the quantum state information to be transmitted.

2. The quantum teleportation and optical communication system co-fiber transmission device as claimed in claim 1, characterized in that: The optical communication transmitting device (1) is a continuous laser or a pulse laser, and is any one of a solid laser, a gas laser, a semiconductor laser and a dye laser.

3. The quantum teleportation and optical communication system co-fiber transmission device as claimed in claim 2, characterized in that: The quantum information transmitting device (2) is any one of a weak coherent single photon source, a propagation-type single photon source and a quantum dot single photon source.

4. The quantum teleportation and optical communication system co-fiber transmission device as claimed in claim 3, characterized in that: The first wavelength division multiplexer (3), the second wavelength division multiplexer (4), the third wavelength division multiplexer (5) and the fourth wavelength division multiplexer (6) are any one of an arrayed waveguide grating, a dense wavelength division multiplexer and an adjustable bandpass filter.

5. The quantum teleportation and optical communication system co-fiber transmission device as claimed in claim 4, characterized in that: The Bell state detection device (7) can adopt either a linear optical scheme or a nonlinear optical scheme.

6. The quantum teleportation and optical communication system co-fiber transmission device as claimed in claim 5, characterized in that: The optical communication receiving device (8) is any one of a photodiode, a PIN diode and an avalanche diode.

7. The quantum teleportation and optical communication system co-fiber transmission device as claimed in claim 6, characterized in that: The quantum entangled light source (9) is any one of spontaneous four-wave mixing and spontaneous parametric down conversion.

8. The quantum teleportation and optical communication system co-fiber transmission device as claimed in claim 7, characterized in that: The quantum information receiving device (10) adopts any one of a photomultiplier tube, an avalanche diode or a superconducting nanowire detector.

9. The quantum teleportation and optical communication system co-fiber transmission device as claimed in claim 8, characterized in that: The optical communication transmitting device (1) uses a PPCL300 continuous semiconductor laser with a line width of 10 kHz and a pump wavelength of 1540.56 nm. The quantum information transmitting device (2) uses a weak coherent single photon source encoded by a time slice method with a wavelength of 1549.16 nm. The first wavelength division multiplexer (3), the second wavelength division multiplexer (4), the third wavelength division multiplexer (5) and the fourth wavelength division multiplexer (6) use dense wavelength division multiplexers with a 3 dB bandwidth of 100 GHz and an insertion loss of 1.5 dB. The Bell state detection device (7) uses a linear optical scheme to project the quantum state onto |ψ with a probability of 1 / 4. - >; The optical communication receiving device (8) uses an S155C indium gallium arsenide photodiode with a wavelength response range of 800-1700nm and an optical power detection range of 1nW-20mW; the quantum entangled light source (9) uses a periodically polarized lithium niobate waveguide to generate a quantum entangled light source with a bandwidth of 10GHz through spontaneous parametric down-conversion and filtering, wherein the central wavelength of the signal photon is 1531.87nm and the central wavelength of the idler photon is 1549.16nm; the quantum information receiving device (10) uses a P-CS-16 superconducting nanowire detector with a single photon detection efficiency ≥85%, a dark count ≤50Hz, and a saturation count rate ≥3MHz.

10. A method for quantum teleportation and optical communication system co-fiber transmission based on the co-fiber transmission device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1: transmitting a classical optical communication signal using an optical communication transmitting device (1); S2: The quantum information transmitting device (2) generates the quantum state to be transmitted, and uses a weak coherent state single photon source or a declared single photon source for encoding, and the encoding degree of freedom is polarization / time slice / path dimension; S3: The classical optical signal and the quantum state signal are combined by the first wavelength division multiplexer (3), and after long-distance optical fiber transmission, the two signals are downloaded by the first wavelength division multiplexer (4), wherein the quantum signal is transmitted to the first wavelength division multiplexer (5) through the optical fiber and downloaded by the first wavelength division multiplexer (6), and then the classical optical communication transmission and reception is completed by the optical communication receiving device (8) of the first wavelength division multiplexer (6); S4: After using the quantum entangled light source (9) to generate an entangled photon pair, the signal photon is sent to the quantum information receiving device (10), and the idler photon passes through the first wavelength division multiplexer (6), passes through the long-distance optical fiber, and then passes through the first wavelength division multiplexer (5) to complete the quantum signal download, and the Bell state detection is completed with the quantum signal downloaded by the first wavelength division multiplexer (4). The detection result is sent to the quantum information receiving device (10) to complete quantum teleportation.

Images