CN102339412B - Coincidence counting system for entangled photon detection experiment - Google Patents
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- CN102339412B CN102339412B CN201110170243.6A CN201110170243A CN102339412B CN 102339412 B CN102339412 B CN 102339412B CN 201110170243 A CN201110170243 A CN 201110170243A CN 102339412 B CN102339412 B CN 102339412B
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Abstract
The invention relates to a coincidence counting system for an entangled photon detection experiment. The system comprises an optical signal detection unit for receiving a single-photon signal, wherein the optical signal detection unit is connected with the signal input end of an electric signal adjustment unit; the signal output end of the electric signal adjustment unit is connected with the signal input end of a controller for counting and processing photons; and the controller communicates with a personal computer (PC). The test parameters of the system can be set by testing personnel according to different systems and test requirements, an entangled light source system is tested, and a test result is uploaded to the PC for observation, storage and subsequent data processing. The whole system has high flexibility and practicability and is subjected to full digital control.
Description
Technical field
The present invention relates to a kind of quantum physics and quantum information experimental provision, especially a kind of coincidence counting system for detection experiment of entangled photons.
Background technology
Principle of state superposition is that quantum mechanics is different from one of essential characteristic of classical physics, is also considered to the core of quantum physics simultaneously, its is described be a quantum-mechanical system can be concerned with simultaneously in several diverse states.About the experimental study of the principle of state superposition of single-particle system, namely so-called Young's double slit experiment is extensively carried out in comprising the systems such as photon, electronics, neutron, atom.Yet, it is found that, the quantum state stack of multi-particles System---quantum entanglement has more more interesting character and application more widely.
Quantum entanglement is exactly the coherence stack of multi-particles System quantum state.Quantum entanglement is that Schrodinger found in nineteen thirty-five, and once discovery, quantum entanglement is just used for proving the incomplete of Foundation of Quantum Mechanics by people such as einstein, has from then on started its long-term puzzlement to quantum physicists.In recent years, quantum entanglement is as emerging field---the core resource of quantum information science, in the practical fields such as quantum cryptography, quantum communications, quantum calculation, also brought into play huge effect.In order to utilize easily quantum entangled photons source to carry out related physical experiment, be necessary to research and develop a kind of coincidence counting system for detection experiment of entangled photons.
Summary of the invention
The object of the present invention is to provide and a kind of test parameter can be set, show test results, dirigibility and the practical coincidence counting system for detection experiment of entangled photons.
For achieving the above object, the present invention has adopted following technical scheme: a kind of coincidence counting system for detection experiment of entangled photons, comprise for receiving the optical signal detection unit of single photon signal, optical signal detection unit is connected with the signal input part of electric signal adjustment unit, the signal output part of electric signal adjustment unit with for photon being counted with the signal input part of the controller of processing, be connected, described controller and PC communication.
As shown from the above technical solution, the present invention can allow tester according to different systems, test request, system testing parameter be arranged, complete the test to entangled light source system, and by test result upload to that PC is observed, storage and late time data process.Whole system of the present invention has higher dirigibility and practicality, and realizes system full-digital control.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present invention;
Fig. 2 is the circuit block diagram of optical signal detection unit in the present invention, electric signal adjustment unit and controller.
Embodiment
A kind of coincidence counting system for detection experiment of entangled photons, comprise for receiving the optical signal detection unit of single photon signal, optical signal detection unit is connected with the signal input part of electric signal adjustment unit 3, the signal output part of electric signal adjustment unit 3 with for photon being counted with the signal input part of the controller of processing, be connected, described controller and PC 6 communications, as shown in Figure 1.
As Fig. 1, shown in 2, described optical signal detection unit is by first, two single-photon detectors 1, 2 form, described controller adopts FPGA controller 4, described electric signal adjustment unit 3 is by first, binary signal discriminator circuit, first, two pulse width regulating circuits and first, two time delay Circuit tunings form, the output terminal of described first signal discriminator circuit is connected with the input end of the first pulse width regulating circuit, the output terminal of the first pulse width regulating circuit is connected with the input end of the first time delay Circuit tuning, the output terminal of secondary signal discriminator circuit is connected with the input end of the second pulse width regulating circuit, the output terminal of the second pulse width regulating circuit is connected with the input end of the second time delay Circuit tuning.
As shown in Figure 1, 2, the signal output part of first and second described single-photon detector 1,2 is connected with the input end of first and second signal screening circuit respectively, the signal output part of first and second time delay Circuit tuning is connected with the signal input part of FPGA controller 4 respectively, and the signal output part of FPGA controller 4 is connected with first and second signal screening circuit, first and second pulse width regulating circuit and first and second time delay Circuit tuning respectively.First and second described single-photon detector 1,2 is arranged in stationary platform, first and second described signal screening circuit, first and second pulse width regulating circuit and the welding of first and second time delay Circuit tuning are encapsulated on circuit board, and described FPGA controller 4 welding are encapsulated on circuit board.Described controller is by interface configuration chip 5 and PC 6 communications, between described optical signal detection unit and electric signal adjustment unit 3, by concentric cable, is connected.
Below in conjunction with Fig. 1,2 the present invention is further illustrated.
When test, the photon that two route entangled light sources produce enters into native system by fiber coupler and carries out coincidence counting measurement;
First two-way photon is input to respectively first by optical fiber, two single-photon detectors 1, in 2, survey, and provide electric signal according to result of detection, first, two single-photon detectors 1, the electric signal of 2 outputs is input to first by concentric cable respectively, binary signal discriminator circuit, first, binary signal discriminator circuit according to the examination voltage arranging to first, two single-photon detectors 1, 2 signals that provide are screened, by screening the setting of voltage, can reduce passing through of single-photon detector secret mark number, first, binary signal discriminator circuit outputs to respectively first by the signal that meets examination requirement by plate upward wiring, two pulse width regulating circuits,
First and second pulse width regulating circuit is adjusted to fixed width output according to the pulse width arranging by the signal of first and second signal screening circuit input, by the resolution that can change system that arranges of pulse width, can reduce the probability of misdescription number, the signal after adjusting by pulse width outputs to first and second time delay Circuit tuning;
First and second time delay Circuit tuning changes the relative time delay between two paths of signals according to the amount of delay arranging, by the setting of amount of delay, can reduce the impact of noise, and can make system applies in different entangled photons origin systems, the signal after adjusting by time delay outputs to FPGA controller 4;
In a word, the present invention can allow tester according to different systems and test request, system testing parameter be arranged, and completes the test to entangled light source system, and by test result upload to that PC 6 is observed, storage and late time data process.
Claims (4)
1. the coincidence counting system for detection experiment of entangled photons, it is characterized in that: comprise for receiving the optical signal detection unit of single photon signal, optical signal detection unit is connected with the signal input part of electric signal adjustment unit (3), the signal output part of electric signal adjustment unit (3) with for photon being counted with the signal input part of the controller of processing, be connected, described controller and PC (6) communication, described optical signal detection unit is by first, two single-photon detectors (1, 2) form, described controller adopts FPGA controller (4), described electric signal adjustment unit (3) is by first, binary signal discriminator circuit, first, two pulse width regulating circuits and first, two time delay Circuit tunings form, the output terminal of described first signal discriminator circuit is connected with the input end of the first pulse width regulating circuit, the output terminal of the first pulse width regulating circuit is connected with the input end of the first time delay Circuit tuning, the output terminal of secondary signal discriminator circuit is connected with the input end of the second pulse width regulating circuit, the output terminal of the second pulse width regulating circuit is connected with the input end of the second time delay Circuit tuning, the signal output part of first and second described single-photon detector (1,2) is connected with the input end of first and second signal screening circuit respectively, the signal output part of first and second time delay Circuit tuning is connected with the signal input part of FPGA controller (4) respectively, and the signal output part of FPGA controller (4) is connected with first and second signal screening circuit, first and second pulse width regulating circuit and first and second time delay Circuit tuning respectively, FPGA controller (4) carries out the two paths of signals after time delay adjustment ' with ' operation, when result is that high hour counter adds one, when result is that low hour counter does not carry out any operation.
2. the coincidence counting system for detection experiment of entangled photons according to claim 1, is characterized in that: described controller is by interface configuration chip (5) and PC (6) communication.
3. the coincidence counting system for detection experiment of entangled photons according to claim 1, is characterized in that: between described optical signal detection unit and electric signal adjustment unit (3), by concentric cable, be connected.
4. the coincidence counting system for detection experiment of entangled photons according to claim 1, it is characterized in that: first and second described single-photon detector (1,2) is arranged in stationary platform, first and second described signal screening circuit, first and second pulse width regulating circuit and the welding of first and second time delay Circuit tuning are encapsulated on circuit board, and described FPGA controller (4) welding is encapsulated on circuit board.
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| CN108469673B (en) * | 2018-01-16 | 2019-10-29 | 南昌大学 | The quantum imaging device and method of entangled photon pairs time and position coincidence detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1932859A (en) * | 2005-07-21 | 2007-03-21 | 华南师范大学 | Photon counter based on programmable logic |
| CN101860358A (en) * | 2010-06-12 | 2010-10-13 | 中国科学技术大学 | Single-photon counting system and counting method |
| CN202102484U (en) * | 2011-06-23 | 2012-01-04 | 安徽量子通信技术有限公司 | Coincidence counting system for detection experiment of entangled photons |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1932859A (en) * | 2005-07-21 | 2007-03-21 | 华南师范大学 | Photon counter based on programmable logic |
| CN101860358A (en) * | 2010-06-12 | 2010-10-13 | 中国科学技术大学 | Single-photon counting system and counting method |
| CN202102484U (en) * | 2011-06-23 | 2012-01-04 | 安徽量子通信技术有限公司 | Coincidence counting system for detection experiment of entangled photons |
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