Quantum Simulation of Bound and Resonant Doubly-Bottom Tetraquark

TL;DR

This paper demonstrates the first quantum simulation of doubly-bottom tetraquark states using a quantum computer, revealing bound states consistent with classical models and showcasing quantum computing's potential in exotic hadron research.

Contribution

It introduces a novel quantum simulation framework for multiquark states, mapping a four-quark Hamiltonian onto a 16-qubit system and identifying bound and resonance states.

Findings

Deeply bound states found in the isoscalar 0(1+) channel

Masses and binding energies align with classical predictions

Quantum simulation proves viable for studying exotic multiquark states

Abstract

We present the first quantum-simulation study of bound and resonant doubly-bottom tetraquark states within a QCD-inspired chiral quark model. An effective four-quark Hamiltonian is mapped onto a 16-qubit register, encoding color, spin, and spatial degrees of freedom, and incorporating both meson-meson and diquark-antidiquark configurations with complete color bases. Using a variational quantum eigensolver, we identify bound and resonance states in the low-lying $S$-wave sector. Deeply bound states are found exclusively in the isoscalar $I(J^{P})=0(1^{+})$ channel, dominated by color-singlet meson-meson components with non-negligible hidden-color contributions. The resulting masses and binding energies are consistent with classical chiral quark model predictions, establishing quantum simulation as a viable framework for studying exotic multiquark states beyond the reach of conventional methods.