arXiv subjects

Hadi Sabri

Publications and source records attributed to Hadi Sabri.

5 recordsLinked to original sources

arXiv2026

Isospin-Based Supersymmetry in Neutron-Proton Pairing gap of fp-Shell Nuclei

This study presents a systematic investigation of the effects of isospin, including both T=0 and T=/0 components, on nucleon pairing correlations in fp-shell nuclei. To this aim, the interacting boson model-4, which explicitly incorporates isospin and spin degrees of freedom, is employed to examine various mass formulas associated with neutron-proton correlations in atomic nuclei. Within this framework, neutron-proton pairing gaps are derived for the first time, providing a unified description of pairing correlations in even-even, odd-A, and odd-odd systems. Furthermore, to achieve a more realistic representation of local nuclear dynamics, effective asymmetric weighting coefficients are introduced into the conventional pairing-gap expressions, motivated by physical considerations related to shell structure, blocking effects, and isospin symmetry. These coefficients are determined through a fit to experimental binding-energy data and lead to a significant improvement in the agreement between theoretical predictions and observed systematic. Additionally, the results support the central assumption regarding the supersymmetry of the first fp-shell nuclei, highlighting the essential role of isospin-dependent effects in shaping neutron-proton pairing collectivity.

nucl-th↗

arXiv2025

Variations of two-neutron separation energies and thermal-neutron capture cross sections versus the pairing gap

In this work, we investigate the experimental correlation between the pairing gap values and two important observables in the study of nuclear structure (two neutron separation energies and thermal-neutron capture cross-sections). To this aim, we focused on the even-even nuclei in the vicinity of Z=50 and Z = 82 closed proton shells, for which the quantum phase transition phenomena are reported. The results show a significant correlation between the pairing gap and the well-known signatures of quantum phase transitions in the nuclei, which are the candidates for E(5) and X(5) critical points. Also, we have explained the special relation between the pairing gap and the cross-section of thermal neutrons in the considered isotopic chains.

nucl-th↗

arXiv2025

Pairing gap as a new observable for critical points in the region of A=100

This study used the pairing gap to identify nuclei as candidates for critical point symmetry around Z=40 and A=100. Nuclei around A = 100 display complex shape evolution and configuration crossing patterns. We utilized the experimental and algebraic frameworks of the interacting boson model and the newly developed interacting boson-fermion model to study the isotopes of Mo and Ru. The results show significant variations in these quantities across nuclei located at the E(5) and X(5) critical points, analyzed through different observables. We also examined another region that is suitable for a shape phase transition. Furthermore, our findings suggest new candidates for critical points in other phase transitional regions for different isotopic chains.

nucl-th↗

arXiv2025

Secure Quantum Relay Networks Using Distributed Entanglement without Classical Authentication

Current quantum communication protocols rely heavily on classical authentication for message origin verification, leaving them vulnerable to evolving attacks that exploit classical trust assumptions. In this work, we propose a novel framework for secure quantum relay networks that completely avoids classical authentication. Instead, we leverage pre-distributed entanglement graphs and non-classical correlation-assisted decoding to enable exclusive message retrieval by designated nodes without broadcasting any key or handshake. The system routes messages across multiple relay nodes, yet ensures that no intermediate node can access the message unless it possesses the entangled state partner. We demonstrate that even in multi-path scenarios with asynchronous entanglement distribution, the protocol guarantees quantum-forward secrecy and end-to-end origin integrity without trusted intermediaries. Simulation results confirm both functionality and robustness under entanglement loss and imperfect detection. This architecture paves the way for scalable quantum communication systems where physical quantum states replace classical authentication mechanisms entirely.

quant-ph↗

arXiv2025

Hybrid Quantum Cryptosystems: Integration of Entanglement-Assisted Decryption and Physical Phase Obfuscation

This study introduces a hybrid cryptographic framework for quantum communication that integrates entanglement-assisted decryption with phase-based physical obfuscation. While conventional quantum protocols often rely on explicit transmission of decryption keys or phase parameters, such models expose critical vulnerabilities to eavesdropping. To address this challenge, we propose a two-stage encryption-decryption mechanism. The first stage employs randomized phase modulation protected by active electromagnetic shielding to conceal the quantum signal from unauthorized interception. The second stage enables legitimate receivers to retrieve encrypted phase data using entangled quantum states, eliminating the need for classical key transfer. A formal mathematical framework is developed to describe the two-stage encoding and decryption process, including phase-modulated entangled states and their transformation under nonlocal correlation and adversarial noise. Simulation metrics confirm that the hybrid system preserves quantum coherence with visibility above 94% and entanglement negativity of 0.86, even under dynamic shielding and transmission noise. Simulation results demonstrate that the combined protocol enhances anti-eavesdropping resilience while maintaining quantum coherence. This architecture is suitable for large-scale secure quantum networks, where multi-layered defense strategies are essential against classical and quantum threats.

quant-ph↗