KR20160087361A - Dynamic single photon generator based on non-demolition photon counter - Google Patents

Dynamic single photon generator based on non-demolition photon counter Download PDF

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KR20160087361A
KR20160087361A KR1020160004398A KR20160004398A KR20160087361A KR 20160087361 A KR20160087361 A KR 20160087361A KR 1020160004398 A KR1020160004398 A KR 1020160004398A KR 20160004398 A KR20160004398 A KR 20160004398A KR 20160087361 A KR20160087361 A KR 20160087361A
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South Korea
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photon
single photon
light source
destructive
probability
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KR1020160004398A
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Korean (ko)
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KR101833116B1 (en
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이창희
황일평
유상화
계명균
손동협
안승현
문상록
정용준
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한국과학기술원
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/70—Photonic quantum communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/503—Laser transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/508—Pulse generation, e.g. generation of solitons
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0852—Quantum cryptography

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Abstract

A dynamic single photon generator based on a non-demolition photon counter according to an embodiment of the present invention comprises: a photon source for performing the function of a light source; a non-demolition photon counter for detecting the number of photons included in a photon pulse output from the photon source; a voltage-controlled optical attenuator for attenuating the photon pulse output from the photon source to enable the output photon pulse to include a single photon; and a processing unit for calculating an attenuation value of the voltage controlled optical attenuator based on the number of the photons detected by the non-demolition photon counter and controlling the voltage-controlled optical attenuator based on the calculated attenuation value. The dynamic single photon generator of the present invention can increase the single photon generation probability of the photon source.

Description

DYNAMIC SINGLE PHOTON GENERATOR BASED ON NON-DEMOLITION PHOTON COUNTER BACKGROUND OF THE INVENTION < RTI ID = 0.0 > [0001] <

The present invention relates to a dynamic single photon generator based on a state non-demolition photon counter.

Generally, quantum cryptography uses the quantum mechanical properties of a single photon. However, with current technology, it is difficult to generate a light source that transmits a pure single photon, so multiple photons are emitted with a certain probability, which poses a serious threat to security.

The quantum state is guaranteed to be unconditional security through non-cloning theorem rationale. However, if more than one multi-photon is generated from the light source, one of them may be acquired by the eavesdropper and then the information can be extracted therefrom.

Therefore, the light source used for quantum cryptography communication should have a low probability of generating multiple photons.

It is an object of the present invention to provide a dynamic single photon generator based on a state non-destructive photonic number detector that reduces the probability of generating multiple photon pulses of a general photon source and increases the probability of generating a single photon pulse.

It is another object of the present invention to provide a dynamic single photon generator based on a state non-destructive photonic number detector capable of significantly reducing the probability of generating multiple photon pulses using a laser light source.

According to an aspect of the present invention, there is provided a dynamic single photon generator based on a state non-destructive photon number detector, including: a light source for performing a function of a light source; Type non-destructive photonic number detector for detecting the number of photons in the non-destructive photonic number detector, a non-destructive photonic number detector for detecting the number of photons in the non-destructive photonic number detector, a photonic pulse attenuating the photon pulse output from the light source to include a single photon, And a processing unit for calculating the attenuation value of the voltage-controlled optical attenuator based on the number of detected photons and controlling the voltage-controlled optical attenuation based on the calculated attenuation value.

In an embodiment, the light source may include a laser corresponding to a coherent light.

In an embodiment, the light source is configured to generate a weak signal at a level close to a single photon pulse based on the limit of detection of the number of photons of the state non-destructive photon number detector and the probability of generating a single photon pulse of the voltage controlled optical attenuator Can be output.

In an embodiment, the processing unit may calculate an attenuation value such that the photon pulse output from the voltage-controlled optical attenuator includes a single photon based on the number of photons detected by the state non-destructive photon number detector.

The effect of the dynamic single photon generator based on the state non-destructive photon number detector according to the present invention is as follows.

According to at least one of the embodiments of the present invention, the probability of generating multiple photon pulses of a general photon source can be reduced and the probability of generating a single photon pulse can be increased.

Also, according to at least one of the embodiments of the present invention, the probability of generating multiple photon pulses can be significantly reduced using a laser light source.

1 illustrates a dynamic single photon generator based on a state non-destructive photon number detector according to an embodiment of the present invention.
2 is a view illustrating an output of a laser light source to which a dynamic single photon generator based on a state non-destructive photon number detector according to an embodiment of the present invention is applied.
FIG. 3 is a graph illustrating an output of a laser light source using a dynamic single photon generator based on a state non-destructive photonic number detector according to an exemplary embodiment of the present invention. Referring to FIG.
4 is a diagram illustrating an example of comparing an output of a laser light source using a dynamic single photon generator based on a state non-destructive photonic number detector according to an embodiment of the present invention with an output of an LED light source.
FIG. 5 is a diagram illustrating another example in which the output of a laser light source using a dynamic single photon generator based on a state non-destructive photon number detector according to an embodiment of the present invention is compared with an output of an LED light source.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

On the other hand, the sizes and arrangements of the structures shown in the drawings are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. That is, the size and arrangement of each component does not entirely reflect the actual size and the actual arrangement.

New technologies based on quantum mechanics such as Quantum Computer and Quantum Key Distribution are attracting attention because quantum technology is a next generation technology that boasts high performance comparable to physically presented limits .

And, a single photon generator is a basic configuration that is frequently applied to this quantum technology. A single photon is used as a quantum state, which is the basic unit of quantum technology, and a single photon generator is important because it is a device that stably generates such a single photon.

In this regard, the present invention proposes a technique for reducing the probability of generating multiple photon pulses of a general light source and increasing the probability of generating a single photon

1 illustrates a dynamic single photon generator based on a state non-destructive photon number detector according to an embodiment of the present invention.

1, a dynamic single photon generator based on a state non-destructive photon number detector includes a photon source 101, a non-demolition photon counter 102, a processing unit 103, a voltage- A fast voltage controlled optical attenuator 104, and an output 105.

First, the photon source 101 is preferably a laser, which is configured to perform the function of a light source of a dynamic single photon generator based on a state non-destructive photon number detector according to the present invention, but a coherent light source such as a laser light, LED, and the like.

 Generally, a photon source can be classified into a laser and a light emitting diode (LED). However, such a general photon source generates a multi-photon pulse, and the generated multi-photon pulse acts as an error or a defect in the quantum system.

On the other hand, an ideal single photon generator means a device which has no multi-photon pulses and emits only a single photon pulse at a uniform time interval. The dynamic single photon generator based on the state non-destructive photon number detector according to the present invention, Even if a laser, which is a photon source, is used, the probability of occurrence of a multiple photon pulse can be reduced and the probability of occurrence of a single photon pulse can be increased.

The photon source 101 included in the present invention limits the photon number detection limit of the state non-destructive photon number detector 102 and the limit of the photon number detection of the voltage-controlled optical attenuator 104 Considering the probability of generating a single photon pulse, it is desirable to emit a weak signal at a level close to a single photon pulse.

State non-destructive photonic number detector 102 can detect the number of photons included in the photon pulse output from the light source 101. [ Then, the number of detected photons can be transmitted to the processing unit 103. [

The processing unit 103 receives the number of photons included in the photon pulse output from the light source 101 from the state non-destructive photon number detector 102 and outputs the attenuation value of the voltage-controlled light attenuator 104 to the number of photons And the voltage-controlled optical attenuator 104 can be controlled based on the calculated attenuation value.

The voltage-controlled optical attenuator 104 receives the control signal transmitted from the processing section 103 and appropriately attenuates the photon pulse output from the light source 101 in response to the received control signal, And output it through the output unit 105. The output unit 105 outputs the single photon pulse.

That is, based on the above-described configuration, the dynamic single photon generator based on the state non-destructive photon number detector according to the present invention can be used as a single photon pulse generator in which the output photon pulse becomes a single photon pulse The probability of occurrence can be increased.

The result of applying the present invention and outputting the photon pulse as a single photon pulse will be described concretely with reference to the following drawings.

2 is a view illustrating an output of a laser light source to which a dynamic single photon generator based on a state non-destructive photon number detector according to an embodiment of the present invention is applied.

Referring to FIG. 2, a photon pulse 202 output from a dynamic single photon generator based on a state non-destructive photon number detector using a laser photon pulse 201 and a laser as a light source can be identified.

For reference, the x-axis represents the number of photons and the y-axis represents the probability that a single photon pulse is generated.

First, when we look at the probability 211 that the photon pulse 201 of the laser contains a single photon, it can be confirmed that it has a probability of about 22.5%.

And, looking at the probability 212 that the photon pulse 202 output from the dynamic single photon generator based on the state non-destructive photon number detector using a laser as a light source according to the present invention includes a single photon, a probability of about 36.8% As shown in Fig.

As a result, a dynamic single photon generator based on a state non-destructive photon number detector using a laser as a light source according to the present invention has a probability of about 44% greater than the probability of generating a single photon pulse in the laser itself (about 24.5%, 211) (About 36.8%, 212) to generate a single photon pulse.

On the other hand, in a dynamic single photon generator based on a state non-destructive photon number detector using a laser as a light source according to the present invention, the probability 220 of generating multiple photon pulses in the laser itself is about 5.33% The probability of occurrence is about 0% which is significantly reduced from 5.33%.

That is, according to the present invention, by using a laser as a light source, the probability of generating a single photon pulse can be increased and the probability of generating a multiple photon pulse at the same time can be significantly reduced.

Further, according to the present invention, when the light source is a laser, it can be confirmed that almost no multi-photon pulses are generated to the extent that the multi-photon pulses can be removed.

FIG. 3 is a graph illustrating an output of a laser light source using a dynamic single photon generator based on a state non-destructive photonic number detector according to an exemplary embodiment of the present invention. Referring to FIG.

Referring to FIG. 3, in the situation where the mu (u) value is 0.37, the laser outputs 301a and 301b according to the single photon generation probability and the multiple photon generation probability and the outputs 302a and 302b of the single photon generator according to the present invention ) Can be confirmed.

2, when a laser is used as a light source, the single photon generator according to the present invention generates a single photon pulse with a probability (36.8%) increased by about 44.3% from the laser itself (25.5%) .

In addition, as to the probability of generating multiple photons, when a single photon generator according to the present invention uses a laser as a light source, multiple photon pulses are generated with a probability (0%) that is significantly reduced from the laser itself (5.3% .

4 is a diagram illustrating an example of comparing an output of a laser light source using a dynamic single photon generator based on a state non-destructive photonic number detector according to an exemplary embodiment of the present invention with an output of an LED light source.

Referring to FIG. 4, the laser output 401a and 401b according to the single photon generation probability and the multiple photon generation probability in the case where the mode is 1 and the mu (u) value is 0.25, (402a, 402b) and the outputs (403a, 403b) of the light emitting diodes.

If a single photon generator employing the present invention uses a laser as the light source, it can generate a single photon pulse with a probability (25%) increased by about 28.2% than the laser itself (19.5%).

It can be seen that this probability (25%) corresponds to a probability of about 53.2% greater than the probability of generating a single photon pulse in a light emitting diode (16%).

In addition, as to the probability of generating multiple photons, if a single photon generator according to the present invention uses a laser as a light source, multiple photon pulses are generated with a probability (0%) that is significantly reduced from the laser itself (2.7% .

It can be seen that this probability (0%) corresponds to a probability that the probability of generating multiple photon pulses in a light emitting diode is significantly reduced (4.0%).

FIG. 5 is a diagram illustrating another example in which the output of a laser light source using a dynamic single photon generator based on a state non-destructive photon number detector according to an embodiment of the present invention is compared with an output of an LED light source.

Referring to FIG. 5, laser output 501a and 501b according to a single photon generation probability and a multi-photon generation probability in the case where the mode is 3 and the mu (u) value is 0.32, the output of the single photon generator according to the present invention (502a, 502b) and the output (503a, 503b) of the light emitting diode.

If a single photon generator according to the present invention uses a laser as a light source, it can generate a single photon pulse with a probability of about 37.2% (31.7%) higher than the laser itself (23.1%).

It can be seen that this probability (31.7%) corresponds to a probability of about 73.2% greater than the probability of generating a single photon pulse (18.2%) in a light emitting diode.

In addition, as to the probability of generating multiple photons, when a single photon generator according to the present invention uses a laser as a light source, a multiphoton pulse is generated with a probability (0%) that is significantly reduced from the laser itself (4.1% .

It can be seen that this probability (0%) corresponds to the probability of being significantly reduced even when compared with the probability (5.8%) that the multi-photon pulse is generated in the light emitting diode.

As a result, the dynamic single photon generator based on the state non-destructive photonic number detector according to the present invention can reduce the probability of occurrence of multiple photon pulses of a general photon source, increase the probability of generating a single photon pulse, The probability of generating multiple photon pulses can be significantly reduced.

Accordingly, the foregoing detailed description should not be construed in any way as limiting and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (4)

A light source that performs a function of a light source;
A state non-destructive photonic number detector for detecting the number of photons included in photon pulses output from the light source;
A voltage-controlled optical attenuator for attenuating a photon pulse output from the light source to include a single photon; And
And a processor for calculating the attenuation value of the voltage-controlled optical attenuator based on the number of photons detected by the state non-destructive photon number detector and controlling the voltage-controlled light attenuation based on the calculated attenuation value. Dynamic Single Photon Generator Based on Photon Count Detector.
The method according to claim 1,
Wherein the light source comprises:
A dynamic single photon generator based on a state non-destructive photonic count detector, wherein the coherent light comprises a corresponding laser.
The method according to claim 1,
Wherein the light source comprises:
A state non-destructive photonic number detector for outputting a weak signal at a level close to a single photon pulse based on the limit of detection of the number of photons of the state non-destructive photonic number detector and the probability of generation of a single photon pulse of the voltage- Based single photon generator.
The method according to claim 1,
Wherein,
Based on the number of photons detected by the state non-destructive photonic number detector, a dynamic single photon based on a state non-destructive photonic number detector that calculates an attenuation value such that the photon pulse output from the voltage- controlled optical attenuator includes a single photon, generator.
KR1020160004398A 2015-01-13 2016-01-13 Dynamic single photon generator based on non-demolition photon counter KR101833116B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109239765A (en) * 2018-08-28 2019-01-18 南昌大学 A kind of imitative core pulse generation device and method

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JP2008259084A (en) * 2007-04-09 2008-10-23 Nec Corp Method for setting intensity of light in optical communication system, and optical communication apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109239765A (en) * 2018-08-28 2019-01-18 南昌大学 A kind of imitative core pulse generation device and method
CN109239765B (en) * 2018-08-28 2022-10-11 南昌大学 Nuclear-like pulse generation device and method

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