IL320669A - Quantum key distribution free space optical communication - Google Patents
Quantum key distribution free space optical communicationInfo
- Publication number
- IL320669A IL320669A IL320669A IL32066925A IL320669A IL 320669 A IL320669 A IL 320669A IL 320669 A IL320669 A IL 320669A IL 32066925 A IL32066925 A IL 32066925A IL 320669 A IL320669 A IL 320669A
- Authority
- IL
- Israel
- Prior art keywords
- bin
- time
- arms
- interferometer
- imbalanced interferometer
- Prior art date
Links
Classifications
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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
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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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
-
- 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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/112—Line-of-sight transmission over an extended range
-
- 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
- H04B10/25—Arrangements specific to fibre transmission
-
- 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
- H04B10/516—Details of coding or modulation
- H04B10/532—Polarisation modulation
-
- 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
- H04B10/516—Details of coding or modulation
- H04B10/54—Intensity modulation
-
- 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
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
-
- 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
Landscapes
- 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)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Communication System (AREA)
- Instruments For Measurement Of Length By Optical Means (AREA)
Claims (27)
1. A photon state converter comprising an imbalanced interferometer, characterized in that said imbalanced interferometer comprising a non-polarizing beam combiner configured to combine optical pulse signals from short and long arms of said imbalanced interferometer to thereby generate the following three observable optical signal pulses responsive to time-bin and phase states encoded photons received by said imbalanced interferometer: (i) a first optical pulse signal responsive to a first time-bin of said time-bin and phase states encoded photon reaching said non-polarizing beam combiner from the short arm of said imbalanced interferometer; (ii) a second optical pulse signal responsive to an interference pattern between said first time-bin reaching said non-polarizing beam combiner from the long arm of said imbalanced interferometer and a second time-bin of said time-bin and phase states encoded photon reaching said non-polarizing beam combiner from said short arm of said imbalanced interferometer; and (iii) a third optical pulse signal responsive to said second time-bin reaching said non-polarizing beam combiner from the long arm of said imbalanced interferometer; and said photon state converter comprising at least one polarization orientation manipulating device configured to affect orthogonal polarization orientations to light components of said imbalanced interferometer and thereby convert said time-bin and phase states encoded photons into hybrid time-bin and polarization states encoded photons.
2. The photon state converter of claim 1 comprising two polarization arms optically coupled to the imbalanced interferometer and configured for generating the two orthogonally polarized optical signals.
3. The photon state converter of claim 2 wherein each one of the polarization arms comprises a respective polarization orientation manipulating device.
4. The photon state converter of claim 2 comprising a half wavelength phase retarder in one of the polarization arms.
5. The photon state converter of claim 1 wherein the time-bin and phase states encoded photons have a defined linear polarization orientation, and wherein said photon state converter comprises a half wavelength phase retarder in one of the arms of the imbalanced interferometer. - 44 -
6. The photon state converter of claim 1 wherein the time-bin and phase states encoded photons have a defined diagonal polarization orientation, and wherein said photon state converter comprises a half wavelength phase retarder in one of the arms of the imbalanced interferometer and a polarizing beam splitter for transmitting said time-bin and phase states encoded photons into the long and short arms of the imbalanced interferometer.
7. The photon state converter of claim 1 wherein the time-bin and phase states encoded photons have a defined linear polarization orientation, and wherein said photon state converter comprises a half wavelength phase retarder in one of the arms of the imbalanced interferometer and a polarizing beam combiner for combining optical signals from the long and short arms of the imbalanced interferometer.
8. A photon state converter comprising: an imbalanced interferometer having at least one polarization orientation manipulating device configured to affect orthogonal polarization orientations to light components passing through a long or a short arm thereof, and a polarizing beam combiner for combining optical signals from the long and short arms of the imbalanced interferometer; and either an optical switch device configured to selectively transmit time-bin signals of time-bin and phase states encoded photons into said long or short arms of the imbalanced interferometer, or an intensity modulator in each of said long and short arms to selectively block passage of time-bin signals of said time-bin and phase states encoded photons through at least one of said arms of the imbalanced interferometer, so as to convert one or more of said time-bin and phase states encoded photons into hybrid time-bin and polarization states encoded photons.
9. The photon state converter of claim 8 comprising respective driver units configured to operate the intensity modulators to periodically block the passage of the one or more of the time-bin signals through the short or long arms arm of the imbalanced interferometer.
10. A photon state converter comprising: an imbalanced interferometer having at least one polarization orientation manipulating device configured to affect orthogonal polarization orientations to light components passing through a long or a short arm thereof, and a polarizing beam combiner for combining optical signals from the long and short arms of the imbalanced interferometer; and an intensity modulator configured to selectively block passage of time-bin and phase states encoded photons obtained from an output of said imbalanced interferometer, so as to convert one or more of said time-bin and phase states encoded photons into hybrid time-bin and polarization states encoded photons.
11. A quantum communication system comprising transmitter and receiver systems configured to communicate over a free space medium, said transmitter system comprising a - 45 - quantum transmitter configured to generate time-bin and phase states modulated photons, and the photon state converter of any one of the preceding claims optically coupled said quantum transmitter for converting the time-bin and phase states encoded photons thereby generated into the hybrid time-bin and polarization states encoded photons for transmission to the receiver system over said free space medium.
12. The quantum communication system of claim 11 wherein the quantum transmitter is mounted in a secure location, and wherein the photon state converter is at a relatively remote and insecure location and optically coupled to said quantum transmitter by one or more optical fibers.
13. The quantum communication system of claim 11 or 12 wherein the receiver system comprises a quantum receiver optically coupled to a photon state converter configured to convert hybrid time-bin and polarization states photons received over the free space medium into time-bin and phase states encoded photons.
14. The quantum communication system of claim 13, wherein the quantum receiver is mounted in a secure location, and wherein the photon state converter in at a relatively remote and insecure location and optically coupled to said quantum receiver by one or more optical fibers.
15. The quantum communication system of any one of claims 11 to 14, wherein the receiver system is configured to carry out polarization plane alignment based on first and third observable optical signal pulses.
16. A photon states encoder comprising: a coherent light source of a defined linear polarization orientation; an interferometer optically coupled to said coherent light source and configured with a polarizing beam combiner for combining optical signals from arms of said interferometer; first and second modulators configured to respectively modulate amplitude and phase of optical signals passing through said arms; and a polarization orientation manipulating device configured to shift polarization orientation of optical signals passing through one of said arms.
17. The photon states encoder of claim 16 comprising separate amplitude and phase modulators in each of the arms.
18. The photon states encoder of claim 16 comprising a single intensity modulator in each of the arms configured to modulate both amplitude and phase of the optical signals.
19. A quantum communication system comprising transmitter and receiver systems configured to communicate over free space medium or optical fibers, said transmitter system - 46 - comprising a quantum transmitter comprising the photon states encoder of any one of claims to 18.
20. A method of converting photon state, the method comprising: passing time-bin and phase states encoded photons through an imbalanced interferometer comprising a non-polarizing beam combiner configured to combine optical pulse signals from short and long arms of said imbalanced interferometer to thereby generate the following three observable optical signal pulses: (i) a first optical pulse signal responsive to a first time-bin of said time-bin and phase states encoded photon reaching said non-polarizing beam combiner from the short arm of said imbalanced interferometer; (ii) a second optical pulse signal responsive to an interference pattern between said first time-bin reaching said non-polarizing beam combiner from the long arm of said imbalanced interferometer and a second time-bin of said time-bin and phase states encoded photon reaching said non-polarizing beam combiner from said short arm of the imbalanced interferometer; and (iii) a third optical pulse signal responsive to said second time-bin of said imbalanced interferometer from the long arm of said imbalanced interferometer, and setting orthogonal polarization orientations to light components from said imbalanced interferometer and thereby converting said time-bin and phase states encoded photons into hybrid time-bin and polarization states encoded photons.
21. The method of claim 20 comprising setting one light components from the imbalanced interferometer into a horizontal orientation and another light component therefrom into a vertical polarization orientation.
22. The method of claim 20 comprising applying a half wavelength phase shift to one the light components of the imbalanced interferometer.
23. The method of claim 20 wherein the time-bin and phase states encoded photons have a defined linear polarization orientation, and wherein the method comprising applying a half wavelength phase shift to optical signals passing through one of the arms of the imbalanced interferometer.
24. The method of claim 20 wherein the time-bin and phase states encoded photons have a defined diagonal polarization orientation, and wherein the method comprising splitting the time-bin and phase states encoded photons into orthogonally polarized light components into the long and short arms of the imbalanced interferometer and applying a half wavelength phase shift to optical signals passing through one of the arms of the imbalanced interferometer. - 47 -
25. The method of claim 20 wherein the time-bin and phase states encoded photons have a defined linear polarization orientation, and wherein the method comprising applying a half wavelength phase shift to optical signals passing through one of the arms of the imbalanced interferometer and combining orthogonally polarized optical signals from the long and short arms of the imbalanced interferometer.
26. A method of converting photons states, the method comprising: either selectively transmitting time-bin signals of time-bin and phase state encoded photons into a short or a long arm of an imbalanced interferometer, or selectively blocking passage of time-bin signals of said time-bin and phase states encoded photons through the short or the long arm of said imbalanced interferometer; affecting orthogonal polarization orientations to light components passing through the long or the short arm of said imbalanced interferometer; and combining optical pulse signals from said short and long arms of said imbalanced interferometer by a polarizing beam combiner, to thereby convert one or more of said time-bin and phase states encoded photons into hybrid time-bin and polarization states encoded photons.
27. A method of converting photons states, the method comprising: passing time-bin and phase states encoded photons through an imbalanced interferometer comprising a polarizing beam combiner configured to combine optical pulse signals from short and long arms of said imbalanced interferometer; affecting orthogonal polarization orientations to light components passing through the long or the short arm of said imbalanced interferometer; and selectively blocking passage of pulse signals obtained through an output of the imbalanced interferometer, to thereby convert one or more of said time-bin and phase states encoded photons into hybrid time-bin and polarization states encoded photons.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US202263430145P | 2022-12-05 | 2022-12-05 | |
| US202363542421P | 2023-10-04 | 2023-10-04 | |
| PCT/IL2023/051248 WO2024121850A1 (en) | 2022-12-05 | 2023-12-05 | Quantum key distribution free space optical communication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IL320669A true IL320669A (en) | 2025-07-01 |
Family
ID=89190649
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IL320669A IL320669A (en) | 2022-12-05 | 2023-12-05 | Quantum key distribution free space optical communication |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4631192A1 (en) |
| KR (1) | KR20250117661A (en) |
| IL (1) | IL320669A (en) |
| WO (1) | WO2024121850A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118921124B (en) * | 2024-07-19 | 2025-09-19 | 中国电子科技集团有限公司电子科学研究院 | Quantum state encoding device, method and software-defined quantum communication system |
| CN118971986B (en) * | 2024-07-19 | 2025-09-23 | 中国电子科技集团有限公司电子科学研究院 | Quantum state decoding device, method and software-defined quantum communication system |
| WO2026016196A1 (en) * | 2024-07-19 | 2026-01-22 | 中国电子科技集团有限公司电子科学研究院 | Time-phase encoding apparatus and method, and quantum communication system |
| CN118921123B (en) * | 2024-07-19 | 2025-09-23 | 中国电子科技集团有限公司电子科学研究院 | Quantum state decoding device, method and software-defined quantum communication system |
| CN118921125B (en) * | 2024-07-19 | 2025-09-19 | 中国电子科技集团有限公司电子科学研究院 | Quantum state encoding device, method and software-defined quantum communication system |
| WO2026016199A1 (en) * | 2024-07-19 | 2026-01-22 | 中国电子科技集团有限公司电子科学研究院 | Quantum state encoding and decoding device and method, and software-defined quantum communication system |
| WO2026044790A1 (en) * | 2024-09-02 | 2026-03-05 | 中国电子科技集团有限公司电子科学研究院 | Quantum state encoding apparatus and method, and software-defined quantum communication system |
| CN119182466B (en) * | 2024-09-02 | 2026-01-02 | 中国电子科技集团有限公司电子科学研究院 | Quantum state encoding devices, methods, and software-defined quantum communication systems |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080198437A1 (en) * | 2006-08-18 | 2008-08-21 | Massachusetts Institute Of Technology | Converting optical information encoding |
| JP5003142B2 (en) | 2006-12-22 | 2012-08-15 | 日本電気株式会社 | Polarization coding-phase coding converter and quantum communication system using the same |
| JP5590601B2 (en) | 2010-01-14 | 2014-09-17 | 独立行政法人情報通信研究機構 | Time bin polarization format conversion technology for blurred light sources |
| EP3357177B1 (en) * | 2015-10-02 | 2020-06-17 | Nokia Technologies Oy | Dual rail compensation in phase encoded communication |
| CN107070655A (en) | 2017-05-24 | 2017-08-18 | 中国电子科技集团公司电子科学研究院 | One kind polarization and phase tangle coding method, device and quantum key dispatching system |
| EP3742664A1 (en) | 2019-05-23 | 2020-11-25 | ID Quantique S.A. | System and method for quantum key distribution over hybrid quantum channel |
| GB2607106B (en) * | 2021-05-28 | 2024-04-17 | Toshiba Kk | An emitter, communication system and method |
| CN113810191B (en) | 2021-10-29 | 2023-10-27 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | Quantum key distribution system, encoder, decoder and method based on circularly polarized light |
-
2023
- 2023-12-05 KR KR1020257021209A patent/KR20250117661A/en active Pending
- 2023-12-05 IL IL320669A patent/IL320669A/en unknown
- 2023-12-05 EP EP23822119.6A patent/EP4631192A1/en active Pending
- 2023-12-05 WO PCT/IL2023/051248 patent/WO2024121850A1/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| KR20250117661A (en) | 2025-08-05 |
| EP4631192A1 (en) | 2025-10-15 |
| WO2024121850A1 (en) | 2024-06-13 |
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