WO2011102710A1 - Method and apparatus for optical polarization photon generator - Google Patents
Method and apparatus for optical polarization photon generator Download PDFInfo
- Publication number
- WO2011102710A1 WO2011102710A1 PCT/MY2010/000194 MY2010000194W WO2011102710A1 WO 2011102710 A1 WO2011102710 A1 WO 2011102710A1 MY 2010000194 W MY2010000194 W MY 2010000194W WO 2011102710 A1 WO2011102710 A1 WO 2011102710A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polarization states
- optical
- diagonal
- optical pulse
- generate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- 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
Definitions
- the present invention relates generally to a method and apparatus for optical polarization photon generator that is capable of generating at least four polarization states.
- QKD Quantum Cryptography or commonly known as Quantum Key Distribution (QKD) is a solution to create and distribute secret keys for use during encryption. Therefore, a QKD system involves two parties, conventionally known as “Alice” and “Bob", where “Alice” represents an encoder and “Bob” represents a decoder.
- encoded photons propagate from “Alice” and the same is received and detected by "Bob” through a quantum channel that resides over optical fibers or free space medium.
- quantum channel is a dedicated transmission channel for polarized single photon pulse between "Alice” and "Bob”. Therefore, either “Alice” or “Bob” is required to generate the polarized single photon source before "Alice” proceeds with the encoding process in the QKD system.
- QKD system requires single photon optical source to encode light element into various states of polarization.
- the number of polarization states depends on the Quantum protocol.
- the preparation of photon into various states of polarization is a delicate process. For instance, free space four deterministic protocol would require at least four polarization or quantum states.
- Conventional methods to prepare the four polarization states is by using four different laser sources with each require a set of passive polarizer. This apparatus is bulky and financially inefficient.
- the method comprises electronically triggering at least two laser sources to generate at least two optical pulses, polarizing each optical pulse of the at least two optical pulses to have orthogonal polarization states, merging the at least two optical pulses having orthogonal polarization states onto a single optical path and altering the orthogonal polarization states of the single optical path to have secondary orthogonal polarization states.
- the method for optically generating polarized photons further comprises altering the orthogonal polarization states of the single optical path to have secondary orthogonal polarization states to generate horizontal polarization states or anti-diagonal polarization states from the vertical polarization states or diagonal polarization states and vertical polarization states or diagonal polarization states from the horizontal polarization states or anti-diagonal polarization states.
- the apparatus comprises at least two laser sources, an arrangement of passive optical components and an active optical component.
- the at least two laser sources further comprises a first laser source and a second laser source having identical wavelength and a high degree of coherence and chromaticity.
- the arrangement of passive optical components further comprises at least two half wave plates, at least two polarizers, and at least one beam combiner.
- FIG. 1 illustrates a flowchart of a method for optically generating polarized photons.
- FIG. 2 illustrates an arrangement of apparatus for optically generating polarized photons.
- the present invention relates to a method and apparatus for optical polarization photon generator having at least four polarization states.
- this specification will describe the present invention according to the preferred embodiments of the present invention. However, it is to be understood that limiting the description to the preferred embodiments of the invention is merely to facilitate discussion of the present invention and it is envisioned that those skilled in the art may devise various modifications and equivalents without departing from the scope of the appended claims.
- FIG. 1 illustrates a flowchart of a method for optically generating polarized photons.
- FIG. 2 illustrates an arrangement of apparatus for optically generating polarized photons.
- the method according to the present invention for optically generating polarized photons comprises the steps of electronically triggering at least two laser sources to generate at least two optical pulses (102), polarizing each optical pulse of the at least two optical pulses to have orthogonal polarization states (104), merging the at least two optical pulses having orthogonal polarization states onto a single optical path (106) and altering the orthogonal polarization states of the single optical path to have secondary orthogonal polarization states (108).
- the apparatus according to the present invention for optically generating polarized photons comprises at least two laser sources, an arrangement of passive optical components and an active optical component.
- the at least two laser sources further comprises a first laser source (202) and a second laser source (214) having identical wavelength and a high degree of coherence and chromaticity.
- the first laser source (202) and the second laser source (214) are electronically triggered at random to generate a first optical pulse and a second optical pulse.
- the arrangement of passive optical components further comprises at least two half wave plates (206, 218), at least two polarizers (208, 220) and at least one beam combiner (226).
- the first optical pulse is passed through half wave plate (206) and polarizer (208) to generate vertical polarization states or diagonal polarization states.
- the second optical pulse is passed through half wave plate (218) and polarizer (220) to generate horizontal polarization states or anti-diagonal polarization states.
- the first optical pulse and the second optical pulse having orthogonal polarization states are passed through the at least one beam combiner (226) to merge the first optical pulse and the second optical pulse having orthogonal polarization states onto a single optical path.
- the beam combiner (226) may be a polarized beam combiner.
- the orthogonal polarization states of the single optical path is passed through the at least one electronically triggered active optical component (236) to generate horizontal polarization states or anti-diagonal polarization states from the vertical polarization states or diagonal polarization states and vertical polarization states or diagonal polarization states from the horizontal polarization states or anti-diagonal polarization states.
- the at least one active optical component (236) may comprise a pockel cell.
- the method and apparatus of the present invention reduces the system complexity and cost through the elimination of redundant laser sources and passive polarizers used in conventional optical polarization photon generators capable of generating four polarization states.
- the method of generating four polarization states begins with the first laser source (202) or the second laser source (214) randomly producing monochromatic first optical pulse (204) and second optical pulse (216) respectively.
- the first optical pulse (204) generated by the first laser source (202) will pass through the arrangement of passive optical components, comprising the half wave plate (206) and polarizer (208), while the second optical pulse (216) generated by the second laser source (214) will pass through half wave plate (218) and polarizer (220).
- the half wave plates (206, 218) are passive and therefore are manually rotated to generate the desired polarization state.
- the polarizers (208, 220) purify the polarization states generated and allow only a single polarization state to pass through it.
- the first optical pulse (204) from the first laser source (202) will generate optical pulse with vertical polarization state (210), while the second optical pulse (216) from the second laser source (214) will generate optical pulse with horizontal polarization state (222).
- the first optical pulse (204) from the first laser source (202) may generate optical pulse with diagonal (+45°) polarization state
- the second optical pulse (216) from the second laser source (214) may generate optical pulse with anti-diagonal (-45°) polarization state.
- the vertical polarized optical pulse (210) will travel on optical path (212) while the horizontal polarized optical pulse (222) will travel on optical path (224).
- the vertical polarized optical pulse (210) and the horizontal polarized optical pulse (222) are merged onto a single optical path (230). Therefore, the resultant output pulse (228) from the beam combiner (226) travels on optical path (230).
- This resultant output pulse (228) comprises optical pulse with vertical polarization state (234) and optical pulse with horizontal polarization state (232), or alternatively optical pulse with +45° polarization state and optical pulse with -45° polarization state.
- the resultant output pulse (228) is then passed through an active optical component (236).
- the active optical component (236) alters the polarization state of any optical pulses that passes through the device when it is switched on or electronically triggered.
- This active optical component (236) is essentially a voltage controlled half wave plate, wherein its characteristics change when an applied voltage is varied.
- the resultant output pulse (228) travelling on optical path (230) will retain its polarization states while passing through the active optical component (236).
- the output optical pulse (238) will be identical to the resultant output pulse (228) that may possibly comprise of optical pulse with vertical polarization state (234) and optical pulse with horizontal polarization state (232), or alternatively optical pulse with +45° polarization state and optical pulse with -45° polarization state.
- the characteristic of the active optical component (236) take off a half wave plate, and is capable of altering the polarization state of the resultant output pulse (228) travelling on optical path (230) that passes through the active optical component (236).
- Optical pulses with vertical polarization states or horizontal polarization states will be altered to have diagonal polarization states or anti-diagonal polarization states, and vice-versa.
- optical pulse with vertical polarization state (234) will be altered to optical pulse with +45° polarization state (242) with reference to a Poincare Sphere, while optical pulse with horizontal polarization state (232) will be altered to optical pulse with -45° polarization state (244) with reference to a Poincare Sphere.
- the number of polarization states may possibly be increased from four to a higher number by using an arrangement of active optical component (236).
- the electronic triggering of the at least two laser sources and the active optical component is controlled by electronic signals from the same electronic system.
- the electronic signals which trigger the first laser source (202) or the second laser source (214) to generate optical pulses are random and synchronized with the electronic signals that trigger a voltage to the active optical component (236).
- the embodiments of the present invention is part of the system implementation in QKD protocol with four polarization states at an equatorial planar with reference to a Poincare Sphere that adopt 'weak pulse laser 1 in the absence of a truly single photon laser source.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Lasers (AREA)
Abstract
A method and apparatus for optically generating polarized photons with at least four polarization states is disclosed. The method and apparatus comprises at least two laser sources that are electronically triggered at random to generate at least two optical pulses (102), an arrangement of passive optical components that polarize each optical pulse of the at least two optical pulses to have orthogonal polarization states (104) and merge the at least two optical pulses having orthogonal polarization states onto a single optical path (106) and an active optical component that alters the orthogonal polarization states of the single optical path to have secondary orthogonal polarization states (108).
Description
METHOD AND APPARATUS FOR OPTICAL POLARIZATION PHOTON GENERATOR FIELD OF INVENTION The present invention relates generally to a method and apparatus for optical polarization photon generator that is capable of generating at least four polarization states.
BACKGROUND ART Quantum Cryptography or commonly known as Quantum Key Distribution (QKD) is a solution to create and distribute secret keys for use during encryption. Therefore, a QKD system involves two parties, conventionally known as "Alice" and "Bob", where "Alice" represents an encoder and "Bob" represents a decoder. In practice of a QKD system, encoded photons propagate from "Alice" and the same is received and detected by "Bob" through a quantum channel that resides over optical fibers or free space medium. In free space medium, quantum channel is a dedicated transmission channel for polarized single photon pulse between "Alice" and "Bob". Therefore, either "Alice" or "Bob" is required to generate the polarized single photon source before "Alice" proceeds with the encoding process in the QKD system.
In summary, QKD system requires single photon optical source to encode light element into various states of polarization. The number of polarization states depends on the Quantum protocol. The preparation of photon into various states of polarization is a delicate process. For instance, free space four deterministic protocol would require at least four polarization or quantum states. Conventional methods to prepare the four polarization states is by using four different laser sources with each require a set of passive polarizer. This apparatus is bulky and financially inefficient.
SUMMARY OF INVENTION
In one embodiment of the present invention is a method for optically generating polarized photons, the method comprises electronically triggering at least two laser sources to generate at least two optical pulses, polarizing each optical pulse of the at least two optical pulses to have orthogonal polarization states, merging the at least two optical pulses having orthogonal polarization states onto a single optical path and altering the orthogonal polarization states of the single optical path to have secondary orthogonal polarization states.
In a further embodiment of the present invention is the method for optically generating polarized photons, the method further comprises altering the orthogonal polarization states of the single optical path to have secondary orthogonal polarization states to generate horizontal polarization states or anti-diagonal polarization states from the vertical polarization states or diagonal polarization states and vertical polarization states or diagonal polarization states from the horizontal polarization states or anti-diagonal polarization states.
In another embodiment of the present invention is an apparatus for optically generating polarized photons, the apparatus comprises at least two laser sources, an arrangement of passive optical components and an active optical component. The at least two laser sources further comprises a first laser source and a second laser source having identical wavelength and a high degree of coherence and chromaticity. The arrangement of passive optical components further comprises at least two half wave plates, at least two polarizers, and at least one beam combiner.
The present invention consists of features and a combination of parts hereinafter fully described and illustrated in the accompanying drawings, it is being understood that various
changes in the details may be made without departing from the scope of the invention or sacrificing any of the advantages of the present invention.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
To further clarify various aspects of some embodiments of the present invention, a more particular description of the invention will be rendered by references to specific embodiments thereof, which are illustrated, in the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope. The invention will be described and explained with additional specificity and detail through the accompanying drawings in which:
FIG. 1 illustrates a flowchart of a method for optically generating polarized photons.
FIG. 2 illustrates an arrangement of apparatus for optically generating polarized photons.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention relates to a method and apparatus for optical polarization photon generator having at least four polarization states. Hereinafter, this specification will describe the present invention according to the preferred embodiments of the present invention. However, it is to be understood that limiting the description to the preferred embodiments of the invention is merely to facilitate discussion of the present invention and it is envisioned that those skilled in the art may devise various modifications and equivalents without departing from the scope of the appended claims.
The various embodiments of the present invention describe a method and an apparatus for an optical polarization photon generator that is capable of generating four polarization or quantum states. Reference is collectively being made to FIGS. 1 & 2. FIG. 1 illustrates a flowchart of a method for optically generating polarized photons. FIG. 2 illustrates an arrangement of apparatus for optically generating polarized photons.
The method according to the present invention for optically generating polarized photons comprises the steps of electronically triggering at least two laser sources to generate at least two optical pulses (102), polarizing each optical pulse of the at least two optical pulses to have orthogonal polarization states (104), merging the at least two optical pulses having orthogonal polarization states onto a single optical path (106) and altering the orthogonal polarization states of the single optical path to have secondary orthogonal polarization states (108).
The apparatus according to the present invention for optically generating polarized photons comprises at least two laser sources, an arrangement of passive optical components and an active optical component.
The at least two laser sources further comprises a first laser source (202) and a second laser source (214) having identical wavelength and a high degree of coherence and chromaticity. The first laser source (202) and the second laser source (214) are electronically triggered at random to generate a first optical pulse and a second optical pulse.
The arrangement of passive optical components further comprises at least two half wave plates (206, 218), at least two polarizers (208, 220) and at least one beam combiner (226). The first optical pulse is passed through half wave plate (206) and polarizer (208) to generate vertical polarization states or diagonal polarization states. The second optical pulse is passed through half wave plate (218) and polarizer (220) to generate horizontal polarization states or anti-diagonal polarization states.
The first optical pulse and the second optical pulse having orthogonal polarization states are passed through the at least one beam combiner (226) to merge the first optical pulse and the second optical pulse having orthogonal polarization states onto a single optical path. The beam combiner (226) may be a polarized beam combiner.
The orthogonal polarization states of the single optical path is passed through the at least one electronically triggered active optical component (236) to generate horizontal polarization states or anti-diagonal polarization states from the vertical polarization states or diagonal polarization states and vertical polarization states or diagonal polarization states from the horizontal polarization states or anti-diagonal polarization states. The at least one active optical component (236) may comprise a pockel cell.
The method and apparatus of the present invention reduces the system complexity and cost through the elimination of redundant laser sources and passive polarizers used in
conventional optical polarization photon generators capable of generating four polarization states.
According to one of the embodiments of the present invention, the method of generating four polarization states begins with the first laser source (202) or the second laser source (214) randomly producing monochromatic first optical pulse (204) and second optical pulse (216) respectively. The first optical pulse (204) generated by the first laser source (202) will pass through the arrangement of passive optical components, comprising the half wave plate (206) and polarizer (208), while the second optical pulse (216) generated by the second laser source (214) will pass through half wave plate (218) and polarizer (220).
The half wave plates (206, 218) are passive and therefore are manually rotated to generate the desired polarization state. The polarizers (208, 220) purify the polarization states generated and allow only a single polarization state to pass through it. In one embodiment of the polarizer configuration, the first optical pulse (204) from the first laser source (202) will generate optical pulse with vertical polarization state (210), while the second optical pulse (216) from the second laser source (214) will generate optical pulse with horizontal polarization state (222). Alternatively, the first optical pulse (204) from the first laser source (202) may generate optical pulse with diagonal (+45°) polarization state, while the second optical pulse (216) from the second laser source (214) may generate optical pulse with anti-diagonal (-45°) polarization state. The vertical polarized optical pulse (210) will travel on optical path (212) while the horizontal polarized optical pulse (222) will travel on optical path (224). When passed through another passive optical component, that is the beam combiner (226), the vertical polarized optical
pulse (210) and the horizontal polarized optical pulse (222) are merged onto a single optical path (230). Therefore, the resultant output pulse (228) from the beam combiner (226) travels on optical path (230). This resultant output pulse (228) comprises optical pulse with vertical polarization state (234) and optical pulse with horizontal polarization state (232), or alternatively optical pulse with +45° polarization state and optical pulse with -45° polarization state. The resultant output pulse (228) is then passed through an active optical component (236).
The active optical component (236) alters the polarization state of any optical pulses that passes through the device when it is switched on or electronically triggered. This active optical component (236) is essentially a voltage controlled half wave plate, wherein its characteristics change when an applied voltage is varied.
When no voltage is applied to the active optical component (236), the resultant output pulse (228) travelling on optical path (230) will retain its polarization states while passing through the active optical component (236). In this case, the output optical pulse (238) will be identical to the resultant output pulse (228) that may possibly comprise of optical pulse with vertical polarization state (234) and optical pulse with horizontal polarization state (232), or alternatively optical pulse with +45° polarization state and optical pulse with -45° polarization state.
When a certain voltage is applied to the active optical component (236), the characteristic of the active optical component (236) take off a half wave plate, and is capable of altering the polarization state of the resultant output pulse (228) travelling on optical path (230) that passes through the active optical component (236). Optical pulses with vertical polarization states or horizontal polarization states will be altered to have diagonal polarization states or anti-diagonal polarization states, and vice-versa.
In one embodiment of the present invention, optical pulse with vertical polarization state (234) will be altered to optical pulse with +45° polarization state (242) with reference to a Poincare Sphere, while optical pulse with horizontal polarization state (232) will be altered to optical pulse with -45° polarization state (244) with reference to a Poincare Sphere.
The number of polarization states may possibly be increased from four to a higher number by using an arrangement of active optical component (236). The electronic triggering of the at least two laser sources and the active optical component is controlled by electronic signals from the same electronic system.
The electronic signals which trigger the first laser source (202) or the second laser source (214) to generate optical pulses are random and synchronized with the electronic signals that trigger a voltage to the active optical component (236). The embodiments of the present invention is part of the system implementation in QKD protocol with four polarization states at an equatorial planar with reference to a Poincare Sphere that adopt 'weak pulse laser1 in the absence of a truly single photon laser source.
Claims
1. A method for optically generating polarized photons, wherein the method (100) comprises
electronically triggering at least two laser sources to generate at least two optical pulses (102);
polarizing each optical pulse of the at least two optical pulses to have orthogonal polarization states (104);
merging the at least two optical pulses having orthogonal polarization states onto a single optical path (106); and
altering the orthogonal polarization states of the single optical path to have secondary orthogonal polarization states (108).
2. The method according to claim 1 , wherein electronically triggering the at least two laser sources to generate the at least two optical pulses further comprises electronically triggering at random a first laser source and a second laser source to generate a first optical pulse and a second optical pulse.
3. The method according to claim 2, wherein polarizing each optical pulse of the at least two optical pulses to have orthogonal polarization states further comprises
passing the first optical pulse through passive optical component to generate vertical polarization states or diagonal polarization states; and passing the second optical pulse through passive optical component to generate horizontal polarization states or anti-diagonal polarization states.
4. The method according to claim 3, wherein merging the at least two optical pulses having orthogonal polarization states onto a single optical path further comprises passing the at least two optical pulses having orthogonal polarization states through passive optical component to merge the at least two optical pulses having orthogonal polarization states onto a single optical path.
5. The method according to claim 4, wherein altering the orthogonal polarization states of the single optical path to have secondary orthogonal polarization states further comprises passing the orthogonal polarization states of the single optical path through an electronically triggered active optical component to generate
horizontal polarization states or anti-diagonal polarization states from the vertical polarization states or diagonal polarization states; and vertical polarization states or diagonal polarization states from the horizontal polarization states or anti-diagonal polarization states.
The method according to claim 1 , wherein the polarized photons comprises at least four polarization states.
An apparatus for optically generating polarized photons, the apparatus comprises at least two laser sources;
an arrangement of passive optical components; and
an active optical component (236);
characterized in that
the at least two laser sources further comprises a first laser source (202) and a second laser source (214) having identical wavelength and a high degree of coherence and chromaticity; and
the arrangement of passive optical components further comprises at least two half wave plates (206, 218);
at least two polarizers (208, 220); and
at least one beam combiner (226).
8. The apparatus according to claim 7, wherein the first laser source and the second laser source are electronically triggering at random to generate a first optical pulse and a second optical pulse.
9. The apparatus according to claim 8, wherein
the first optical pulse is passed through half wave plate (206) and polarizer (208) to generate vertical polarization states or diagonal polarization states; and
the second optical pulse is passed through half wave plate (218) and polarizer (220) to generate horizontal polarization states or anti-diagonal polarization states.
10. The apparatus according to claim 9, wherein
the first optical pulse and the second optical pulse having orthogonal polarization states are passed through the at least one beam combiner (226) to merge the first optical pulse and the second optical pulse having orthogonal polarization states onto a single optical path.
11. The apparatus according to claim 10, wherein the orthogonal polarization states of the single optical path is passed through the at least one active optical component
(236) electronically triggered to generate
horizontal polarization states or anti-diagonal polarization states from the vertical polarization states or diagonal polarization states; and vertical polarization states or diagonal polarization states from the horizontal polarization states or anti-diagonal polarization states.
12. The apparatus according to claim 7, wherein the polarized photons comprises at least four polarization states.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| MYPI2010000712 | 2010-02-17 | ||
| MYPI2010000712 | 2010-02-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2011102710A1 true WO2011102710A1 (en) | 2011-08-25 |
Family
ID=44483156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/MY2010/000194 Ceased WO2011102710A1 (en) | 2010-02-17 | 2010-09-30 | Method and apparatus for optical polarization photon generator |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2011102710A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109995517A (en) * | 2017-12-29 | 2019-07-09 | 科大国盾量子技术股份有限公司 | A kind of miniaturization light quantum coding device and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6522796B1 (en) * | 2000-10-24 | 2003-02-18 | Jds Uniphase Corporation | Depolarizing polarization mode combiner |
| US20050135627A1 (en) * | 2003-12-22 | 2005-06-23 | Anton Zavriyev | Two-way QKD system with active compensation |
| US20080050126A1 (en) * | 2006-08-28 | 2008-02-28 | Massachusetts Institute Of Technology | Selecting optical waves |
| US7536012B1 (en) * | 2003-08-06 | 2009-05-19 | The United States Of America As Represented By The Secretary Of The Army | Entangled quantum communications and quantum imaging |
-
2010
- 2010-09-30 WO PCT/MY2010/000194 patent/WO2011102710A1/en not_active Ceased
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6522796B1 (en) * | 2000-10-24 | 2003-02-18 | Jds Uniphase Corporation | Depolarizing polarization mode combiner |
| US7536012B1 (en) * | 2003-08-06 | 2009-05-19 | The United States Of America As Represented By The Secretary Of The Army | Entangled quantum communications and quantum imaging |
| US20050135627A1 (en) * | 2003-12-22 | 2005-06-23 | Anton Zavriyev | Two-way QKD system with active compensation |
| US20080050126A1 (en) * | 2006-08-28 | 2008-02-28 | Massachusetts Institute Of Technology | Selecting optical waves |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109995517A (en) * | 2017-12-29 | 2019-07-09 | 科大国盾量子技术股份有限公司 | A kind of miniaturization light quantum coding device and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US11451308B1 (en) | Quantum communications system having pulses divided into time bins and associated methods | |
| CN111130779B (en) | A real-time tracking and compensation OAM entanglement modulation key distribution network system and method | |
| CN106789048B (en) | Quantum key distribution system and method based on two-way single photon detection | |
| CN104092539A (en) | A spin-orbit angular momentum hybrid modulation quantum key distribution method and system | |
| CN104506308A (en) | Method and device for manufacturing external modulation high-speed decoy-state quantum light sources | |
| EP4178123B1 (en) | Quantum communications system having at least one waveplate to alter pulse polarization and associate methods | |
| US8068741B2 (en) | Polarization to phase converter | |
| Pilnyak et al. | Quantum tomography of photon states encoded in polarization and picosecond time bins | |
| CN204334601U (en) | A kind of high speed of external modulation inveigles the device of state quantum light source | |
| CN111917488A (en) | Phase Modulation Polarization Codec Device and Quantum Key Distribution System | |
| CN109120401A (en) | HVDC Modulation quantum key distribution time bit-phase decoding methods, devices and systems of polarized orthogonal rotation | |
| JP2004064513A (en) | Quantum cryptographic communication method, transverse mode separation device, and reception device | |
| CN109039622B (en) | Quantum key distribution time bit-phase decoding method and device and corresponding system | |
| WO2011102710A1 (en) | Method and apparatus for optical polarization photon generator | |
| JP2022182993A (en) | Optical emitter, communication system, and method | |
| Vijayadharan et al. | A Sagnac-based arbitrary time-bin state encoder for quantum communication applications | |
| Wang et al. | Chaos secure communication based on free-running VCSEL system | |
| CN108199840B (en) | Quantum key distribution system | |
| Boyer et al. | Attacks on fixed-apparatus quantum-key-distribution schemes | |
| CN210578572U (en) | Phase modulation polarization encoding and decoding device and quantum key distribution system | |
| Kowalski et al. | Encryption method based on pseudo random spatial light modulation for single-fibre data transmission | |
| Trefilov | Imperfect state preparation in quantum key distribution | |
| CN109039623B (en) | Method and device for decoding direct current modulation quantum key distribution phase and corresponding system | |
| Agnesi et al. | Time-bin Quantum Key Distribution exploiting the iPOGNAC polarization moulator and Qubit4Sync temporal synchronization | |
| CN109039619B (en) | Quantum key distribution time bit-phase decoding method and device and corresponding system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 10846240 Country of ref document: EP Kind code of ref document: A1 |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 10846240 Country of ref document: EP Kind code of ref document: A1 |