Fiber-integrated broadband source of polarization entangled photons in telecom C and L- bands, has type-zero phase-matched zinc indiffused magnesium oxide doped periodically poled lithium niobate ridge waveguide to employ spontaneous parametric down conversion technique to generate broad spectrum
	YADAV V K; GHOSH J
	2023-07-11
专利权人	INDIAN INST TECHNOLOGY DELHI (IITD-C)
申请日期	2023-07-11
专利号	IN202311046589-A
成果简介	NOVELTY - Fiber-integrated broadband source (100) of polarization entangled photons in telecom C- bands and L- bands, has a type-0 phase-matched zinc (Zn) indiffused magnesium oxide (MgO) doped periodically poled lithium niobate (PPLN) ridge waveguide (110) configured to employ a spontaneous parametric down conversion (SPDC) technique to generate a broad spectrum of multiple polarization entangled photons at one or more telecom wavelengths. The one or more telecom wavelengths falls in the standard telecommunication band comprises any or a combination of a C-band and an L-band. The broad spectrum of multiple polarization entangled photons generated is capable to be channelized in an International Telecommunication Union (ITU) grid employing a wavelength-division-multiplexer (WDM) and an arrayed waveguide grating (AWG) to employ in a multi-user quantum key distribution (QKD) network and the quantum communication. USE - Fiber-integrated broadband source of polarization entangled photons in telecom C- bands and L- bands used in wavelength-division-multiplexed (WDM) based quantum key distribution (QKD), communication networks and long-distance quantum communication. ADVANTAGE - The generated polarization-entangled state shows two-photon interference with minimum fringe visibility 86% and raw concurrence ~ 0.83. The quantum fidelity of generated F+ Bell-state is 89%, and it violates CHSH-Bell inequality (S = 2.49 ± 0.017) by ~ 29 standard deviations. The source is employable in wavelength-division-multiplexed (WDM) based quantum key distribution (QKD)/communication networks and long-distance quantum communication. The source is completely fiber integrated so that it is compact, portable and does not require the hassles of free-space optical alignment and is easy to miniaturize. The system and method which is effective in terms of quantum fidelity, concurrence, coincidence-to-accidental ratio (CAR), and two-photon interference visibility. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for generating a broadband source of polarization entangled photons in telecom C- and L- bands by a source, which involves: connecting, a type-0 phase-matched Zn indiffused MgO doped periodically OLED lithium niobate (PPLN) ridge waveguide (110) to with a first fiber polarization beam splitter (FPBS) by employing one or more optical fibers coupled to the waveguide facet forming portion of a Sagnac loop configuration, propagating, a pump photon to the type-0 phase-matched Zn indiffused MgO doped periodically poled lithium niobate (PPLN) ridge waveguide employing a Wavelength-Division Multiplexer (WDM) (106) and the first fiber polarization beam splitter (FPBS) (108-1) by controlling the power of the pump photon by employing an inline variable optical attenuator (VOA) (104), rotating, a horizontal polarization (H-pol) arm of the first FPBS automatically to vertical polarization (V-pol) by a 90-degree twist of optical fibers at the waveguide facet to configure such that a first pump photon and a second pump photon counter-propagating through the type-0 phase-matched Zn indiffused MgO doped periodically poled lithium niobate (PPLN) ridge waveguide are always in vertical polarization state at the waveguide facet, nerating, a signal (S) photon and an idler (I) photon in the vertical polarization and convert the signal (S) photon and the idler (I) photon in the clockwise direction to the horizontal polarization by rotation and maintaining the signal photon and the idler photon in the anti-clockwise direction unchanged from the vertical polarization, generating, a broad spectrum of a multiple polarization entangled photons at one or more telecom wavelengths by recombining the signal (S) photon and the idler (I) photon in the horizontal polarization and the signal (S) photon and the idler (I) photon in the vertical polarization after the first FPBS in the same spatial mode and filtering out the residue of the pump photon employing an inline long pass filter (LPF), and splitting, the broad spectrum of a multiple polarization entangled photons at telecom wavelengths into two halves using a C-L band splitter and transmitting the signal (S) photon through a C-arm and the idler (I) photon through an L-arm and characterizing the entanglement between the signal (S) photon and the idler (I) photon DESCRIPTION OF DRAWING(S) - The drawing shows experimental setup for polarization entangled photon pair generation source. 100Fiber-integrated broadband source 104Inline variable optical attenuator 106Wavelength-Division Multiplexer (WDM) 108-1First fiber polarization beam splitter (FPBS) 110Ridge waveguide
IPC 分类号	A61B-003/10 ; H01L-029/78 ; H04B-010/70 ; H04J-014/02 ; H04L-009/08
国家	印度
专业领域	材料科学
语种	英语
成果类型	专利
文献类型	科技成果
条目标识符	http://119.78.100.226:8889/handle/3KE4DYBR/21330
专题	中国科学院新疆生态与地理研究所
作者单位	INDIAN INST TECHNOLOGY DELHI (IITD-C)
推荐引用方式 GB/T 7714	YADAV V K,GHOSH J. Fiber-integrated broadband source of polarization entangled photons in telecom C and L- bands, has type-zero phase-matched zinc indiffused magnesium oxide doped periodically poled lithium niobate ridge waveguide to employ spontaneous parametric down conversion technique to generate broad spectrum. IN202311046589-A[P]. 2023.

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