Quantum Entanglement and Quantum Simulation Involving Atomic Nuclei

par Ashutosh Singh (IJClab)

jeudi 18 juin 2026, 14:00 → 15:00 Europe/Paris

100/2-A201 - Salle A201 (IJCLab)

Understanding strongly interacting quantum many-body systems remains a central challenge in nuclear physics, largely due to the exponential growth of the Hilbert space. Quantum computing offers a promising framework to overcome these classical computational limits. In this seminar, I will present my recent research activities at the intersection of nuclear physics and quantum information science, focusing on the development of quantum algorithms to simulate open nuclear systems and analyze nuclear correlations.

I will begin by discussing a hybrid quantum-classical algorithm designed to simulate nuclear resonance states. By applying the Complex Scaling Method (CSM) to the nuclear Hamiltonian, we transform the resonance problem into a non-Hermitian eigenvalue problem, which is then solved using a variational quantum algorithm. I will demonstrate how this method, leveraging Gray code encoding to minimize required qubit resources, has been successfully applied to D- and G-wave resonances in an $\alpha - \alpha$ scattering potential.

Next, I will introduce a quantum-native approach for computing Clebsch-Gordan (CG) coefficients. By reformulating the recursive calculation as a homogeneous linear system, we utilize the Variational Quantum Linear Solver (VQLS) to efficiently encode these essential angular momentum coefficients into the amplitudes of a quantum state. Following this, I will present an application of quantum information theory to nuclear structure, specifically focusing on the quantification of proton-neutron spin entanglement within the deuteron ground state.

To conclude, I will briefly outline my ongoing postdoctoral work here at IJCLab, discussing the theoretical and computational challenges of scaling these approaches to tackle heavier, many-body nuclear systems.