High energy density materials (HEDMs) are crucial in explosives and energy storage fields. The conversion of N-N and N=N bonds to NN is associated with substantial energy release, and polymeric nitrogen stands out as a promising HEDMs candidate owing to its abundant N-N and N=N bonds. However, polymeric nitrogen typically exhibits poor stability under ambient conditions. Applying high pressure and introducing coordinating elements are two proven strategies to enhance its stability. Herein, we explored the InN6 compounds via crystal structure prediction approach and identify two dynamically stable phases within the pressure range of 0 - 100 GPa. Notably, the ɑ-P-1-InN6 phase demonstrates exceptional performance, featuring a high volumetric energy density (Ev = 18.33 kJ/cm3), high detonation pressure (Pd = 264.96 GPa), and superior detonation velocity (Vd = 34.57 km/s). These outstanding properties endow ɑ-P-1-InN6 with great application potential in energy storage and explosive manufacturing.
{"title":"Investigation of high energy density InN₆ compounds under high pressure","authors":"Yongju Dang , Xing Sun , Haizhou Wang, Jinyu Liu, Dandan Zhang, Lili Gao, Miao Zhang","doi":"10.1016/j.physleta.2026.131415","DOIUrl":"10.1016/j.physleta.2026.131415","url":null,"abstract":"<div><div>High energy density materials (HEDMs) are crucial in explosives and energy storage fields. The conversion of N-N and N=N bonds to N<img>N is associated with substantial energy release, and polymeric nitrogen stands out as a promising HEDMs candidate owing to its abundant N-N and N=N bonds. However, polymeric nitrogen typically exhibits poor stability under ambient conditions. Applying high pressure and introducing coordinating elements are two proven strategies to enhance its stability. Herein, we explored the InN<sub>6</sub> compounds via crystal structure prediction approach and identify two dynamically stable phases within the pressure range of 0 - 100 GPa. Notably, the ɑ-<em>P</em>-1-InN<sub>6</sub> phase demonstrates exceptional performance, featuring a high volumetric energy density (E<sub>v</sub> = 18.33 kJ/cm<sup>3</sup>), high detonation pressure (P<sub>d</sub> = 264.96 GPa), and superior detonation velocity (V<sub>d</sub> = 34.57 km/s). These outstanding properties endow ɑ-<em>P</em>-1-InN<sub>6</sub> with great application potential in energy storage and explosive manufacturing.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131415"},"PeriodicalIF":2.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-15Epub Date: 2026-01-27DOI: 10.1016/j.physleta.2026.131413
Akhtar Munir , Muqaddar Abbas , Zia Uddin , Shi-Hai Dong , Chunfang Wang
We propose a theoretical study of the Goos-Hänchen (GH) shift in a cavity magnomechanical setup with a yttrium iron garnet (YIG) sphere placed within an optical cavity. The bias magnetic field induces magnon modes in the sphere. These magnons interact with cavity photons through the magnetic dipole interaction and with mechanical vibrations via the magnetostrictive effect. By investigating the hybrid magnon-photon modes, we notice two coupling regimes: level repulsion associated with coherent magnon-photon coupling and level attraction associated with dissipative coupling, which results in the formation of exceptional points. Using a transfer matrix technique, we examine the GH shift of the reflected probe beam and show that level repulsion causes positive lateral shifts, whereas level attraction causes significant negative shifts. The GH shift sign switched via magnon-photon and magnon-phonon couplings, enabling non-Hermitian photonics interfaces and sensitive sensors through level repulsion and attraction.
{"title":"Exceptional-point control of the Goos-Hänchen shift in a cavity magnomechanics","authors":"Akhtar Munir , Muqaddar Abbas , Zia Uddin , Shi-Hai Dong , Chunfang Wang","doi":"10.1016/j.physleta.2026.131413","DOIUrl":"10.1016/j.physleta.2026.131413","url":null,"abstract":"<div><div>We propose a theoretical study of the Goos-Hänchen (GH) shift in a cavity magnomechanical setup with a yttrium iron garnet (YIG) sphere placed within an optical cavity. The bias magnetic field induces magnon modes in the sphere. These magnons interact with cavity photons through the magnetic dipole interaction and with mechanical vibrations via the magnetostrictive effect. By investigating the hybrid magnon-photon modes, we notice two coupling regimes: level repulsion associated with coherent magnon-photon coupling and level attraction associated with dissipative coupling, which results in the formation of exceptional points. Using a transfer matrix technique, we examine the GH shift of the reflected probe beam and show that level repulsion causes positive lateral shifts, whereas level attraction causes significant negative shifts. The GH shift sign switched via magnon-photon and magnon-phonon couplings, enabling non-Hermitian photonics interfaces and sensitive sensors through level repulsion and attraction.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131413"},"PeriodicalIF":2.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081206","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-15Epub Date: 2026-01-27DOI: 10.1016/j.physleta.2026.131397
Dongming Liu , Dexin Xia , Tingting Lv , Jian Han , Bing Yu , Jinhui Shi
Integrating switchable and multiple functionalities into a single metasurface is crucial in optical anti-counterfeiting, information multiplexing, and augmented/virtual reality. However, most efforts have focused on functional diversification, making it challenging to balance bandwidth and efficiency. Here, we demonstrate a full-space hybrid metasurface that may implement versatile polarization manipulation by controlling the Fermi level of graphene. The bianisotropic metasurface exhibits high-efficiency dual-broadband asymmetric transmission. Both the preservation and conversion of handedness are simultaneously achieved in adjacent broadband regimes. The underlying physical mechanisms are elucidated through Fabry-Perot-like resonance and near-field distribution. Furthermore, the angular dependence of multiple polarization properties is investigated. The proposed hybrid metasurface enables full-space, high-efficiency and broadband manipulation of circularly polarized waves, facilitating advances in information multiplexing, polarization-sensitive imaging, and encryption.
{"title":"Versatile terahertz metasurface integrated graphene with dual-polarization asymmetric transmission and reflective dual-broadband polarization manipulation of circularly polarized waves","authors":"Dongming Liu , Dexin Xia , Tingting Lv , Jian Han , Bing Yu , Jinhui Shi","doi":"10.1016/j.physleta.2026.131397","DOIUrl":"10.1016/j.physleta.2026.131397","url":null,"abstract":"<div><div>Integrating switchable and multiple functionalities into a single metasurface is crucial in optical anti-counterfeiting, information multiplexing, and augmented/virtual reality. However, most efforts have focused on functional diversification, making it challenging to balance bandwidth and efficiency. Here, we demonstrate a full-space hybrid metasurface that may implement versatile polarization manipulation by controlling the Fermi level of graphene. The bianisotropic metasurface exhibits high-efficiency dual-broadband asymmetric transmission. Both the preservation and conversion of handedness are simultaneously achieved in adjacent broadband regimes. The underlying physical mechanisms are elucidated through Fabry-Perot-like resonance and near-field distribution. Furthermore, the angular dependence of multiple polarization properties is investigated. The proposed hybrid metasurface enables full-space, high-efficiency and broadband manipulation of circularly polarized waves, facilitating advances in information multiplexing, polarization-sensitive imaging, and encryption.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131397"},"PeriodicalIF":2.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-15Epub Date: 2026-01-24DOI: 10.1016/j.physleta.2026.131414
Qing Zeng , Wenhui Xu , Hang Xu , Hui Li , Jianquan Yao
Dynamically reconfigurable metasurfaces for terahertz (THz) wavefront control are highly desirable for advanced communication, imaging, and sensing systems. Here, we propose a cascaded all-dielectric metasurface that enables continuously tunable beam steering through a Moiré phase-superposition mechanism. Two closely stacked 2-bit silicon coding layers generate programmable composite phase profiles under relative mechanical rotation. Counter-rotation produces a one-dimensional effective phase gradient, allowing continuous single-beam steering within ±50° at the design frequency in the yoz plane, whereas only single-layer rotation produces coupled x-y phase gradients, thereby enabling two-dimensional steering with an azimuthal tuning range of ±45°. The simulated steering characteristics exhibit excellent agreement with analytical predictions, with consistently high transmission efficiency and stable main-lobe amplitude across the full tuning range. This compact and reconfigurable cascaded architecture provides an efficient route toward wide-range, continuous, and high-performance THz beam manipulation via simple mechanical actuation.
{"title":"Moiré-enabled continuously tunable beam steering in cascaded all-dielectric terahertz metasurfaces","authors":"Qing Zeng , Wenhui Xu , Hang Xu , Hui Li , Jianquan Yao","doi":"10.1016/j.physleta.2026.131414","DOIUrl":"10.1016/j.physleta.2026.131414","url":null,"abstract":"<div><div>Dynamically reconfigurable metasurfaces for terahertz (THz) wavefront control are highly desirable for advanced communication, imaging, and sensing systems. Here, we propose a cascaded all-dielectric metasurface that enables continuously tunable beam steering through a Moiré phase-superposition mechanism. Two closely stacked 2-bit silicon coding layers generate programmable composite phase profiles under relative mechanical rotation. Counter-rotation produces a one-dimensional effective phase gradient, allowing continuous single-beam steering within ±50° at the design frequency in the <em>yoz</em> plane, whereas only single-layer rotation produces coupled <em>x</em>-<em>y</em> phase gradients, thereby enabling two-dimensional steering with an azimuthal tuning range of ±45°. The simulated steering characteristics exhibit excellent agreement with analytical predictions, with consistently high transmission efficiency and stable main-lobe amplitude across the full tuning range. This compact and reconfigurable cascaded architecture provides an efficient route toward wide-range, continuous, and high-performance THz beam manipulation via simple mechanical actuation.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131414"},"PeriodicalIF":2.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-15Epub Date: 2026-01-20DOI: 10.1016/j.physleta.2026.131377
Zhen Liu , Xiaohui Song , Zinan Ma , Rui He , Suicai Zhang , Leiming Yu , Yurong Jiang , Congxin Xia
Van der Waals vertical heterostructures provide an ideal platform for polarization-sensitive photodetection via tailorable interlayer transitions and anisotropic light-matter interactions. However, conventional metal top electrodes fundamentally constrain device performance by inducing optical shadowing that attenuates polarization-dependent photon flux and introducing interfacial Fermi-level pinning that mask intrinsic material anisotropy. In this study, we propose a graphene-engineered ReS2/WSe2 vertical photodiode that employs graphene as an optically transparent electrode. Utilizing ReS2’s in-plane crystalline anisotropy and type-II band alignment with WSe2, the device exhibits barrier-free electrical transport with rectification ratios exceeding 105 at ±1 V bias while achieving self-powered broadband response with on/off ratios of 106 under 405 nm illumination and 103 at 1064 nm. It simultaneously delivers a responsivity of 0.72 A W-1 combined with specific detectivity reaching 2.8 × 1010 cm Hz1/2 mW-1, accompanied by rapid response times with a 138 μs rise and a 128 μs fall. Notably, it achieves polarization-discriminative operation with a photocurrent anisotropy ratio of 1.82 under 405 nm polarized illumination. This design realizes a high-performance self-driven photodetector that integrates broadband response, polarization sensitivity, and filter-free operation within a single vertical architecture, paving a technological pathway toward compact, high-efficiency multifunctional optoelectronics.
范德华垂直异质结构通过可定制的层间跃迁和各向异性光-物质相互作用为偏振敏感光探测提供了理想的平台。然而，传统的金属顶部电极从根本上限制了器件的性能，因为它会产生光学阴影，从而衰减偏振相关的光子通量，并引入界面费米能级钉住，从而掩盖材料的本征各向异性。在这项研究中，我们提出了一种采用石墨烯作为光学透明电极的石墨烯工程ReS2/WSe2垂直光电二极管。利用ReS2的面内晶体各向异性和与WSe2的ii型波段取向，该器件在±1 V偏置下具有无障碍电输运，整流比超过105，同时在405 nm照明下实现自供电宽带响应，开关比为106，在1064 nm照明下为103。同时提供了0.72 a W-1的响应率，比探测率达到2.8 × 1010 cm Hz1/2 mW-1，并伴随着138 μs上升和128 μs下降的快速响应时间。值得注意的是，在405 nm偏振光照射下，光电流各向异性比为1.82，实现了偏振判别操作。本设计实现了一种高性能的自驱动光电探测器，它将宽带响应、极化灵敏度和无滤波器操作集成在一个单一的垂直结构中，为紧凑、高效的多功能光电子技术铺平了技术道路。
{"title":"Graphene-engineered WSe2/ReS2 vertical photodiode for self-powered polarization-sensitive broadband photodetection","authors":"Zhen Liu , Xiaohui Song , Zinan Ma , Rui He , Suicai Zhang , Leiming Yu , Yurong Jiang , Congxin Xia","doi":"10.1016/j.physleta.2026.131377","DOIUrl":"10.1016/j.physleta.2026.131377","url":null,"abstract":"<div><div>Van der Waals vertical heterostructures provide an ideal platform for polarization-sensitive photodetection via tailorable interlayer transitions and anisotropic light-matter interactions. However, conventional metal top electrodes fundamentally constrain device performance by inducing optical shadowing that attenuates polarization-dependent photon flux and introducing interfacial Fermi-level pinning that mask intrinsic material anisotropy. In this study, we propose a graphene-engineered ReS<sub>2</sub>/WSe<sub>2</sub> vertical photodiode that employs graphene as an optically transparent electrode. Utilizing ReS<sub>2</sub>’s in-plane crystalline anisotropy and type-II band alignment with WSe<sub>2</sub>, the device exhibits barrier-free electrical transport with rectification ratios exceeding 10<sup>5</sup> at ±1 V bias while achieving self-powered broadband response with on/off ratios of 10<sup>6</sup> under 405 nm illumination and 10<sup>3</sup> at 1064 nm. It simultaneously delivers a responsivity of 0.72 A W<sup>-1</sup> combined with specific detectivity reaching 2.8 × 10<sup>10</sup> cm Hz<sup>1/2</sup> mW<sup>-1</sup>, accompanied by rapid response times with a 138 μs rise and a 128 μs fall. Notably, it achieves polarization-discriminative operation with a photocurrent anisotropy ratio of 1.82 under 405 nm polarized illumination. This design realizes a high-performance self-driven photodetector that integrates broadband response, polarization sensitivity, and filter-free operation within a single vertical architecture, paving a technological pathway toward compact, high-efficiency multifunctional optoelectronics.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131377"},"PeriodicalIF":2.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081009","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-15Epub Date: 2026-01-22DOI: 10.1016/j.physleta.2026.131408
Thameur Dammak, Kawthar Abid, Abir Kessentini
This work reports on the photophysical properties of organic inorganic naturally self-assembled material bis (2-aminobenzimidazole) tetraiodocadmate (C7H8N3)2CdI4. The crystal structure consists of isolated CdI4 tetrahedra surrounded by 2-aminobenzimidazole cations. The two organic and inorganic units building this material are optically active, giving rise to optical properties involving the competition and the interaction of two inorganic and organic luminescent molecules. When excited by ultraviolet light irradiation, this hybrid material exhibits a strong greenish emission centered at 500 nm that can be seen even with the naked eye at room temperature, which can be attributed to the organic molecule. A decrease in temperature leads to the appearance of new emission bands at 550, 575 and 600 nm, which shift the chromaticity toward warmer regions of the visible spectrum. This emission at low temperature is supposed to be due to excitonic recombination involving a resonant energy transfer (RET) mechanism in which CdI4 tetrahedra act as a donor and (2-aminobenzimidazole) molecule acts as an acceptor. This assignment is supported by theoretical band structure calculations in terms of density functional theory (DFT). The emergence of additional low-temperature emission bands highlights a fascinating competition between Frenkel-type excitons localized on the organic molecule and Wannier-type excitons associated with the CdI4 tetrahedra, suggesting complex excitonic interactions within the hybrid system.
{"title":"Optical characterization and DFT-based band structure analysis of the zero-dimensional hybrid material (C7H8N3)2CdI4","authors":"Thameur Dammak, Kawthar Abid, Abir Kessentini","doi":"10.1016/j.physleta.2026.131408","DOIUrl":"10.1016/j.physleta.2026.131408","url":null,"abstract":"<div><div>This work reports on the photophysical properties of organic inorganic naturally self-assembled material bis (2-aminobenzimidazole) tetraiodocadmate (C<sub>7</sub>H<sub>8</sub>N<sub>3</sub>)<sub>2</sub>CdI<sub>4</sub>. The crystal structure consists of isolated CdI<sub>4</sub> tetrahedra surrounded by 2-aminobenzimidazole cations. The two organic and inorganic units building this material are optically active, giving rise to optical properties involving the competition and the interaction of two inorganic and organic luminescent molecules. When excited by ultraviolet light irradiation, this hybrid material exhibits a strong greenish emission centered at 500 nm that can be seen even with the naked eye at room temperature, which can be attributed to the organic molecule. A decrease in temperature leads to the appearance of new emission bands at 550, 575 and 600 nm, which shift the chromaticity toward warmer regions of the visible spectrum. This emission at low temperature is supposed to be due to excitonic recombination involving a resonant energy transfer (RET) mechanism in which CdI<sub>4</sub> tetrahedra act as a donor and (2-aminobenzimidazole) molecule acts as an acceptor. This assignment is supported by theoretical band structure calculations in terms of density functional theory (DFT). The emergence of additional low-temperature emission bands highlights a fascinating competition between Frenkel-type excitons localized on the organic molecule and Wannier-type excitons associated with the CdI<sub>4</sub> tetrahedra, suggesting complex excitonic interactions within the hybrid system.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131408"},"PeriodicalIF":2.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146170959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-15Epub Date: 2026-01-22DOI: 10.1016/j.physleta.2026.131392
Avinash Khare , Avadh Saxena
A symmetric model has recently attracted attention due to its usefulness in studying tunable phase transitions. We analyze the behavior of this model for the entire range of parameters and obtain its kink and pulse solutions. For completeness, we also present several periodic solutions of this model. Furthermore, we present a generalized symmetric model where and obtain its kink and pulse solutions for arbitrary n.
{"title":"Solitons of the symmetric ϕ4−ϕ2|ϕ|−ϕ2 triple well model","authors":"Avinash Khare , Avadh Saxena","doi":"10.1016/j.physleta.2026.131392","DOIUrl":"10.1016/j.physleta.2026.131392","url":null,"abstract":"<div><div>A symmetric <span><math><mrow><msup><mi>ϕ</mi><mn>4</mn></msup><mspace></mspace><mo>−</mo><mspace></mspace><msup><mi>ϕ</mi><mn>2</mn></msup><mrow><mo>|</mo><mi>ϕ</mi><mo>|</mo></mrow><mspace></mspace><mo>−</mo><mspace></mspace><msup><mi>ϕ</mi><mn>2</mn></msup></mrow></math></span> model has recently attracted attention due to its usefulness in studying tunable phase transitions. We analyze the behavior of this model for the entire range of parameters and obtain its kink and pulse solutions. For completeness, we also present several periodic solutions of this model. Furthermore, we present a generalized symmetric <span><math><mrow><msup><mi>ϕ</mi><mrow><mn>4</mn><mi>n</mi></mrow></msup><mspace></mspace><mo>−</mo><mspace></mspace><msup><mi>ϕ</mi><mrow><mn>2</mn><mi>n</mi></mrow></msup><mrow><mo>|</mo><mi>ϕ</mi><mo>|</mo></mrow><mspace></mspace><mo>−</mo><mspace></mspace><msup><mi>ϕ</mi><mn>2</mn></msup></mrow></math></span> model where <span><math><mrow><mi>n</mi><mo>=</mo><mn>1</mn><mo>,</mo><mn>2</mn><mo>,</mo><mn>3</mn><mo>,</mo><mo>…</mo></mrow></math></span> and obtain its kink and pulse solutions for arbitrary <em>n</em>.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"575 ","pages":"Article 131392"},"PeriodicalIF":2.6,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146081005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-05Epub Date: 2026-01-18DOI: 10.1016/j.physleta.2026.131382
Ranjit Singh , Alexander E. Teretenkov
We investigate entangled Schrödinger cat-like states (SCLSs) in degenerate and non-degenerate spontaneous parametric down-conversion (SPDC) with a fully quantized, depleted pump. Our fully quantum treatment, visualized via Wigner functions, reveals non-Gaussian features and interference patterns absent in semiclassical models. For degenerate SPDC, we demonstrate significant squeezing (up to 4.04 dB) and robust super-Poissonian statistics in both non-dissipative and dissipative regimes. Extending to non-degenerate SPDC, we confirm that pump quantization also generates non-Gaussian states in all modes and yields a higher-dimensional entanglement structure, evidenced by a larger Schmidt number (K(ND) ≈ 10.38) compared to the degenerate case (K ≈ 1.93). Our approach captures critical dynamics like energy exchange and phase-dependent evolution. These entangled SCLSs, non-Gaussian states realizable in χ(2) media at moderate intensities and offering advantages over χ(3)-based schemes, are promising resources for quantum sensing and information processing.
{"title":"The formation of entangled Schrödinger cat-like states in the process of spontaneous parametric down-conversion","authors":"Ranjit Singh , Alexander E. Teretenkov","doi":"10.1016/j.physleta.2026.131382","DOIUrl":"10.1016/j.physleta.2026.131382","url":null,"abstract":"<div><div>We investigate entangled Schrödinger cat-like states (SCLSs) in degenerate and non-degenerate spontaneous parametric down-conversion (SPDC) with a fully quantized, depleted pump. Our fully quantum treatment, visualized via Wigner functions, reveals non-Gaussian features and interference patterns absent in semiclassical models. For degenerate SPDC, we demonstrate significant squeezing (up to 4.04 dB) and robust super-Poissonian statistics in both non-dissipative and dissipative regimes. Extending to non-degenerate SPDC, we confirm that pump quantization also generates non-Gaussian states in all modes and yields a higher-dimensional entanglement structure, evidenced by a larger Schmidt number (<em>K</em><sup>(ND)</sup> ≈ 10.38) compared to the degenerate case (<em>K</em> ≈ 1.93). Our approach captures critical dynamics like energy exchange and phase-dependent evolution. These entangled SCLSs, non-Gaussian states realizable in <em>χ</em><sup>(2)</sup> media at moderate intensities and offering advantages over <em>χ</em><sup>(3)</sup>-based schemes, are promising resources for quantum sensing and information processing.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131382"},"PeriodicalIF":2.6,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-05Epub Date: 2026-01-16DOI: 10.1016/j.physleta.2026.131363
F. Aljuaydi , E.K. Jaradat , A. Rahman , A.-B A. Mohamed
We study quantum control of correlations in driven, open multi-qubit systems described by a Hamiltonian with competing Heisenberg, ZZ and DM interactions and a hybrid Ohmic-Markovian environment. We track quantum discord D(ρ), reflected entropy ER(ρ), and a quantum Pearson coefficient to resolve both global and operator-specific correlations. A functional hierarchy emerges: Hybrid control rapidly generates broadband correlations, DD-Seq robustly preserves them as a selective ZZ engineer, while BB control is highly parameter-sensitive, and in a high-frequency regime the undriven Natural evolution can outperform active protocols. Simulations for chains with –6 qubits confirm that this hierarchy and its correlation patterns persist in finite registers. Strong environmental coupling induces a selective decoherence mechanism in which entanglement ER(ρ) decouples dynamically from overall quantumness D(ρ), suggesting new routes to correlation-selective, fault-tolerant quantum control.
{"title":"A hierarchy of quantum control and the dissociation of entanglement from quantum discord","authors":"F. Aljuaydi , E.K. Jaradat , A. Rahman , A.-B A. Mohamed","doi":"10.1016/j.physleta.2026.131363","DOIUrl":"10.1016/j.physleta.2026.131363","url":null,"abstract":"<div><div>We study quantum control of correlations in driven, open multi-qubit systems described by a Hamiltonian with competing Heisenberg, ZZ and DM interactions and a hybrid Ohmic-Markovian environment. We track quantum discord <em>D</em>(<em>ρ</em>), reflected entropy <em>E<sub>R</sub></em>(<em>ρ</em>), and a quantum Pearson coefficient to resolve both global and operator-specific correlations. A functional hierarchy emerges: Hybrid control rapidly generates broadband correlations, DD-Seq robustly preserves them as a selective ZZ engineer, while BB control is highly parameter-sensitive, and in a high-frequency regime the undriven Natural evolution can outperform active protocols. Simulations for chains with <span><math><mrow><mi>N</mi><mo>=</mo><mn>2</mn></mrow></math></span>–6 qubits confirm that this hierarchy and its correlation patterns persist in finite registers. Strong environmental coupling induces a selective decoherence mechanism in which entanglement <em>E<sub>R</sub></em>(<em>ρ</em>) decouples dynamically from overall quantumness <em>D</em>(<em>ρ</em>), suggesting new routes to correlation-selective, fault-tolerant quantum control.</div></div>","PeriodicalId":20172,"journal":{"name":"Physics Letters A","volume":"574 ","pages":"Article 131363"},"PeriodicalIF":2.6,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146026055","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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