Thermal effects of the quantum states generated from the isomorphs of PPKTP crystal

Jin, Rui-Bo; Chen, Guo-Qun; Laudenbach, Fabian; Zhao, Shengmei; Lu, Peixiang

doi:10.1016/j.optlastec.2018.07.014

Cited by 13 publications

(9 citation statements)

References 53 publications

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“…The theoretical study in this article is based on room temperature. For periodically polarized crystals, temperature is a factor that cannot be ignored [46,[51][52][53]. The variation of temperature affects the refractive indices of the crystals,and thus changes the quasi-phase matching conditions of the crystal.…”

Section: Discussionmentioning

confidence: 99%

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Terahertz waves generation using the isomorphs of PPKTP crystal: a theoretical investigation

Chen,

Zhao,

Wang

et al. 2021

Preprint

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Highly efficient terahertz (THz) wave sources based on difference frequency generation (DFG) process in nonlinear optical crystals play an important role for the applications of THz wave. In order to find more novel nonlinear crystals, here we theoretically investigate the generation of THz wave using the isomorphs of periodically poled KTiOPO 4 (PPKTP), including periodically poled RTP, KTA, RTA and CTA. By solving the cascaded difference frequency coupled wave equations, it is found that the intensities of the THz wave generated from the cascaded difference frequency processes are improved by 5.27, 2.87, 2.82, 3.03, and 2.76 times from the non-cascaded cases for KTP, RTP, KTA, RTA and CTA, respectively. The effects of the crystal absorption, the phase mismatch and the pump intensity are also analyzed in detail. This study might help to provide a stronger THz radiation source based on the nonlinear crystals.

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Section: Discussionmentioning

confidence: 99%

“…Λ is the poling period. pure single photons sources at telecom wavelength [16][17][18] and for mid-infrared single photon generation [19].…”

Section: Introductionmentioning

confidence: 99%

Terahertz waves generation using the isomorphs of PPKTP crystal: a theoretical investigation

Chen,

Zhao,

Wang

et al. 2021

Preprint

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“…Several works have been demonstrated for spectrally uncorrelated biphotons generation using different GVM crystals at different wavelengths. For example, the KDP crystal at 830 nm has a maximal purity of 0.97; 23‐25 11 isomorphs of KDP can also maintain high spectral purity at near‐infrared and telecom wavelengths; 26 the β‐barium borate (BBO) crystal at 1526 nm can achieve a maximal purity of 0.82; 17,27‐29 the periodically poled KTP crystal (PPKTP) at 1584 nm has a maximal purity of 0.82, 30‐39 and this high purity can be kept when the wavelength is tuned from 1400 to 1700 nm; 33 the purity for PPKTP crystals can be further improved from 0.82 to near 1 using the custom poling crystal, 40‐48 or even using a machine‐learning framework; 49 four isomorphs of PPKTP can retain the properties of PPKTP, that is, these isomorphs satisfy the GVM condition and can prepare spectrally uncorrelated biphoton state in the range of 1300 to 2100 nm 50‐52 …”

Section: Introductionmentioning

confidence: 99%

Spectrally uncorrelated biphotons generated from “the family of BBO crystal”

Jin

Cai

Ding

et al. 2020

Quantum Engineering

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Summary Spectrally intrinsically uncorrelated biphoton states generated from nonlinear crystals are very important but rare resources for quantum photonics and quantum information applications. Previously, such biphoton states were generated from several kinds of crystals, however, their wavelength ranges and nonlinear efficiencies were still limited for various applications. In order to explore new crystal for wider wavelength range and higher nonlinear efficiency, here we theoretically study the generation of spectrally uncorrelated biphoton states from 14 crystals in the “BBO family,” including BBO, CLBO, KABO, KBBF, RBBF, CBBF, BABF, BiBO, LBO, CBO, LRB4, LCB, YCOB, and GdCOB. They satisfy three kinds of group‐velocity matching condition from near‐infrared to telecom wavelengths. Furthermore, heralded single photons can be generated with a purity as high as 0.98, which is achieved without any narrow filtering. The indistinguishability of photons from independent sources is examined by the Hong‐Ou‐Mandel interference, which results in a visibility of 98% also without any further filtering, that is, photons from different heralded single‐photon sources are highly indistinguishable. Our study may provide single‐photon sources with good performance for quantum information processing at near‐infrared and telecom wavelengths.

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“…The isomorphs of a KTP crystal, including RTP (RbTiOPO 4 ), KTA (KTiOAsO 4 ), RTA (RbTiOAsO 4 ), and CTA (CsTiOAsO 4 ), have the general form of M TiOXO 4 with {M = K, Rb, Cs} and {X = P, As (for M = Cs only)} [25,26]. It was recently discovered that these four crystals have good performance in the type-II phase-matched CO-SPDC [27][28][29][30]. These crystals still retain the desirable properties of their parent PPKTP crystal and can generate pure photons with high spectral purity (over 0.8) and wide tunability (from 1300 nm to 2100 nm) [27,28].…”

Section: Introductionmentioning

confidence: 99%

Counter-propagating spectrally uncorrelated biphotons at 1550 nm generated from periodically poled MTiOXO4 (M = K, Rb, Cs; X = P, As)

Cai,

Wei,

Wang

et al. 2020

Preprint

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We theoretically investigated spectrally uncorrelated biphotons generated in a counterpropagating spontaneous parametric downconversion (CP-SPDC) from periodically poled M TiOXO4 (M = K, Rb, Cs; X = P, As) crystals. By numerical calculation, it was found that the five crystals from the KTP family can be used to generate heralded single photons with high spectral purity and wide tunability. Under the type-0 phase-matching condition, the purity at 1550 nm was between 0.91 and 0.92, and the purity can be maintained over 0.90 from 1500 nm to 2000 nm wavelength. Under the type-II phase-matching condition, the purity at 1550 nm was 0.96, 0.97, 0.97, 0.98, and 0.98 for PPKTP, PPRTP, PPKTA, PPRTA, and PPCTA, respectively; furthermore, the purity can be kept over 0.96 for more than 600 nm wavelength range. We also simulated the Hong-Ou-Mandel interference between independent photon sources for PPRTP crystals at 1550 nm, and interference visibility was 92% (97%) under type-0 (type-II) phase-matching condition. This study may provide spectrally pure narrowband single-photon sources for quantum memories and quantum networks at telecom wavelengths.

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Thermal effects of the quantum states generated from the isomorphs of PPKTP crystal

Cited by 13 publications

References 53 publications

Terahertz waves generation using the isomorphs of PPKTP crystal: a theoretical investigation

Terahertz waves generation using the isomorphs of PPKTP crystal: a theoretical investigation

Spectrally uncorrelated biphotons generated from “the family of BBO crystal”

Counter-propagating spectrally uncorrelated biphotons at 1550 nm generated from periodically poled MTiOXO4 (M = K, Rb, Cs; X = P, As)

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