International Journal of Theoretical Physics最新文献

{"title":"Analysis of (B^0_{(s)}) Meson Decays Into Two Charm Mesons","authors":"Somayeh Khodadad,&nbsp;Behnam Mohammadi,&nbsp;Mehdi Lotfizadeh","doi":"10.1007/s10773-025-06066-7","DOIUrl":"10.1007/s10773-025-06066-7","url":null,"abstract":"<div><p>In this presentation, we have discussed the two body decays of <span>(B^0rightarrow D^{*-}D^{(*)+}_s)</span> within the quantum chromodynamics (QCD) factorization framework. To calculate the branching fraction of <span>(B^0rightarrow D^{*-}D^{*+}_s)</span> decay we have used helicity amplitudes of <span>(mathcal {A}_0,mathcal {A}_+)</span> and <span>(mathcal {A}_-)</span>. To show the contribution of <span>(mathcal {A}_0)</span>, we have calculated the branching ratio using it separately. The results are <span>(mathcal {B}(B^0rightarrow D^{*-}D^{*+}_s)_{mathcal {A}_0,mathcal {A}_pm }={(1.78pm 0.46)times 10^{-2}})</span> and <span>(mathcal {B}(B^0rightarrow D^{*-}D^{*+}_s)_{mathcal {A}_0}={(1.05pm 0.29)times 10^{-2}})</span> and the experimental value is <span>(mathcal {B}(B^0rightarrow D^{*-}D^{*+}_s)=1.77pm 0.14)times 10^{-2})</span>. For the first time, the LHCb collaboration reported the values of all helicity amplitudes and the fraction of longitudinal polarization that is determined to be <span>(f_L(B^0rightarrow D^{*-}D^{*+}_s)=0.587pm 0.010pm 0.011)</span>, in this paper we have obtained <span>(begin{aligned} f_Lend{aligned})</span> <span>(begin{aligned}(B^0rightarrow D^{*-}D^{*+}_s)end{aligned})</span> <span>(begin{aligned} ={0.599pm 0.012}end{aligned})</span> . The most precision measurements of the ratio of branching fractions in the <span>(begin{aligned} mathcal {R}_1=end{aligned})</span><span>(begin{aligned}{[mathcal {B}(B^0rightarrow D^{*-}D^{*+}_s)}end{aligned})</span><span>(begin{aligned} times mathcal {B}(D^{*+}_srightarrow D^+_sgamma )]/mathcal {B}end{aligned})</span> <span>(begin{aligned}(B^0rightarrow D^{*-} D^+_s)end{aligned})</span> have been reported by LHCb collaboration with the value of <span>(2.045pm 0.022pm 0.071)</span> and we have achieved <span>({1.700pm 0.390})</span>. In other words, our calculations are in good agreement with the LHCb collaboration reports, and we have also provided the most updated values of these calculations. In the following, we have investigated the two body decay of <span>(B^0_s)</span> into <span>(D^{*-})</span> and <span>(D^+_s)</span> mesons that its experimental value was reported in 2023 by LHCb group about <span>((3.90pm 0.80)times 10^{-4})</span> and we have obtained <span>((3.96pm 1.21)times 10^{-4})</span>. Also, we have estimated the branching fraction ratio of <span>(mathcal {R}_2=mathcal {B}(B^0_srightarrow D^{*-} D^{+}_s)/mathcal {B}(B^0rightarrow D^{*-} D^+_s))</span> and obtained the numerical result <span>(0.049pm 0.015)</span>, while the LHCb collaboration measured to be <span>(0.049pm 0.006pm 0.003pm 0.002)</span>.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164717","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Quantum Secure Hamming Distance Computation Based on Single-Particle States","authors":"Yi-Hua Zhou,&nbsp;Wei-Yi Pu,&nbsp;Yu-Guang Yang,&nbsp;Wei-Min Shi","doi":"10.1007/s10773-025-06071-w","DOIUrl":"10.1007/s10773-025-06071-w","url":null,"abstract":"<div><p>Secure Hamming distance computation is a critical problem in secure multiparty computation, enabling two parties to compute the Hamming distance between their private data while ensuring confidentiality. The Hamming distance measures the difference between two binary strings of equal length, making it an effective metric for data similarity. It has wide applications in fields such as data error correction (Hamming code), privacy-preserving computation, machine learning, pattern recognition, and so on. In this paper, we propose a quantum protocol for Hamming distance computation. With the assistance of a semi-honest third party (TP), two participants can securely compute the Hamming distance using single-particle states. The protocol requires only the application of the quantum operators <span>(X)</span> and <span>(I)</span> by the participants, with no need to prepare or measure the quantum state, ensuring its practical feasibility. The correctness and fairness analysis demonstrates the viability of the protocol, while the security analysis confirms its resilience to both internal and external attacks.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"A Review of Perfect Quantum State Transfer, from One to Two and Three Dimensional Arrays of Qubits","authors":"Marzieh Asoudeh,&nbsp;Vahid Karimipour","doi":"10.1007/s10773-025-06061-y","DOIUrl":"10.1007/s10773-025-06061-y","url":null,"abstract":"<div><p>In the light of recent advances in fabricating single layer quantum chips and a possible road toward development of multi-layer quantum chips, we review, in a detailed way, the subject of quantum state transfer with particular emphasis on perfect quantum state transfer in two and three dimensional lattices. We show how one can route an unknown quantum state from one node in a single layer of a quantum chip to another one on another layer with unit fidelity. Our method of presentation in this review allows the reader with a modest background in quantum mechanics to grasp the essential ideas and methods of this important branch of quantum information theory.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164252","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Strange Quark Stars with Kuchowicz Metric Function in Modified Gravitational Theory","authors":"Meghanil Sinha,&nbsp;S. Surendra Singh","doi":"10.1007/s10773-025-06069-4","DOIUrl":"10.1007/s10773-025-06069-4","url":null,"abstract":"<div><p>This work explores the strange quark stars under the Kuchowicz metric function utilizing the MIT Bag equation of state (EoS) in the context of modified <span>(f(R,L_{m},T))</span> gravitational theory approach. This metric potential is regular and physically plausible. By matching the interior spacetime of the strange star to the exterior Schwarzschild spacetime, we have derived the correct form of the metric potentials. Our analysis includes findings from analytical and numerical approaches which encompasses various physical properties including energy conditions, EoS which are seen to be met within the stellar interior. To account for the stability we have considered the study of adiabetic index, surface redshift and the speed of sound with favourable outcomes. We have also shown that values of the model parameter values have significant influence on all these aspects. Thus, in <span>(f(R,L_{m},T))</span> gravity, our stellar model shows promising results by adhering to the energy conditions, EoS bounds and within the stability range of surface redshift, adiabetic index and speed of sound analysis.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164098","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Open Relativistic Two-body Problem","authors":"Andrew Koshelkin","doi":"10.1007/s10773-025-06059-6","DOIUrl":"10.1007/s10773-025-06059-6","url":null,"abstract":"<div><p>The open relativistic two-body problem, when two interacting particles also are in external potentials, is considered in terms of the principle of the least action. The exact covariant operator equations, which determine the dynamics of either a scalar particle or each components of the 16 component spinor of spin-<span>(varvec{1/2})</span> fermions, depending on the particle type, in (3+1) MInkowskii space-time are derived in the center-mass and relative motion variables, beyond the consideration in the Breit frame only. The class of external and interaction potentials, when the two-body problem can be covariantly reformulated in (3+1) phase space of relative motion variables, uncoupled from the center-mass motion of such a system, is outlined. In the case of fermions the new <span>(gamma)</span>-matrix basis generating the Dirac-like equation for the 16 component spinors in the (3+1) phase space is found. The chosen basis allows us to decouple the derived Dirac-like equation into four independent equations governing the dynamics of the four-component spinors. The developed approach is examined in studying the low-energy positronium states in magnetic fields.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145163472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Deterministic Controlled Teleportation for an Arbitrary Unknown Quantum State of a Qubit","authors":"Jun-Long Zhao,&nbsp;Li Yu,&nbsp;Chui-Ping Yang","doi":"10.1007/s10773-025-06056-9","DOIUrl":"10.1007/s10773-025-06056-9","url":null,"abstract":"<div><p>A protocol is presented for teleporting an unknown arbitrary quantum pure state of a two-state particle from a sender to a distant receiver, via control of multiple players in a network. This protocol operates essentially via a multi-particle entangled state initially shared by the sender, the receiver, and the controlling players in a network. By exploiting this protocol, the success rate of teleportation is 1 and the receiver can restore the original quantum state to be teleported with the help of all controlling players; however, even if one of the controlling players does not cooperate, no information, encoded via amplitude or phase, or both, can be accessed by the receiver.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161858","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Application of Chaitin’s Incompleteness Theorem to Quantum Gravity","authors":"Mir Faizal,&nbsp;Arshid Shabir,&nbsp;Aatif Kaisar Khan","doi":"10.1007/s10773-025-06065-8","DOIUrl":"10.1007/s10773-025-06065-8","url":null,"abstract":"<div><p>In this paper, we explore the applications of Chaitin’s incompleteness theorem to quantum gravity. Chaitin’s theorem, grounded in the concept of Kolmogorov complexity, asserts that within any formal mathematical system, there exist true statements whose Kolmogorov complexity surpasses the system’s capacity to encode or prove them. Since quantum gravity must be described by a formal mathematical framework, it follows that there are true statements about the universe, arising from quantum gravity, whose Kolmogorov complexity exceeds the computational capabilities of the underlying formal system. Consequently, this implies that the universe or multiverse cannot be the computational outcome of a formal system describing quantum gravity. We discuss an explicit application of this conclusion to the spacetime foam.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"High‑efficient Quantum Co-signature Scheme","authors":"Xingqiang Zhao,&nbsp;Tianlong Chen,&nbsp;Wang Chen","doi":"10.1007/s10773-025-06058-7","DOIUrl":"10.1007/s10773-025-06058-7","url":null,"abstract":"<div><p>Efficiency and security have always been the basic criteria for designing quantum signature schemes. Some existing quantum signature schemes use a large number of quantum entangled states, which not only increases the cost, but also affects the efficiency. A high-efficient quantum co-signature scheme is designed using only the two-particle quantum state and the Bell state, in which the quantum source are reduced and the efficiency is improved. The performance of the proposed scheme is evaluated from the aspects of security and efficiency, and the analysis shows that the new scheme is secure and efficient. Furthermore, the proposed novel high-efficient quantum co-signature scheme can be implemented by existing physical techniques.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Unidirectional and Bidirectional Controlled Assisted Cloning of an Arbitrary m-qudit State","authors":"Yu Lu,&nbsp;Songya Ma,&nbsp;Fangru Li","doi":"10.1007/s10773-025-06057-8","DOIUrl":"10.1007/s10773-025-06057-8","url":null,"abstract":"<div><p>Utilizing the ingeniously selected quantum channel, we first propose a universal protocol to deterministically achieve the assisted clone of an arbitrary <i>m</i>-qudit state. In the first stage of the protocol, controlled teleportation is carrying out to transmit the unknown state from the sender to the receiver under the supervision of a controller. In the second stage, with the aid of the preparer through suitable positive-operator-value measurement and projection measurement, the perfect copy of the initial state can be created at the sender’s location. Then we consider the two-way scenario and design another assisted-clone protocol. Comparing with the previous unidirectional and bidirectional assisted-clone protocols for multi-particle and high-dimensional states, which produce the unknown state and its orthogonal complement state, the proposed protocols create the perfect copy of the unknown state. Furthermore, we discuss the case that the quantum channel is non-maximally entangled.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145161449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}

{"title":"Singularity Avoidance in Gravitational Collapse of an Inhomogeneous Fluid in Rastall Gravity","authors":"Akbar Jahan,&nbsp;Halime Miraghaei,&nbsp;Shayesteh Ghaffari,&nbsp;Amir Hadi Ziaie","doi":"10.1007/s10773-025-06049-8","DOIUrl":"10.1007/s10773-025-06049-8","url":null,"abstract":"<div><p>Various types of inhomogeneous collapse models in general relativity (GR) lead to the formation of spacetime singularities either visible or hidden by a spacetime horizon. Our aim in the present work is to search for nonsingular models in Rastall gravity that arise as the final outcomes of spherically symmetric gravitational collapse of an inhomogeneous matter cloud. We firstly assume linear equations of state (EoS) for radial and tangential pressure profiles, i.e., <span>(p_r=w_rrho )</span> and <span>(p_theta =w_theta rho )</span>, then we set the Rastall parameter in such a way that the effective pressure in radial direction vanishes and examine the conditions under which the spacetime singularity can be avoided. We find exact nonsingular collapse solutions for which the collapsing cloud reaches a minimum physical radius at a finite amount of time and then rebounds to an expanding phase where the matter shells start moving away from each other. The solutions we obtain respect the weak energy condition (WEC) which is important for physical validity of the model.</p></div>","PeriodicalId":597,"journal":{"name":"International Journal of Theoretical Physics","volume":"64 7","pages":""},"PeriodicalIF":1.7,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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}