We study the spin-entangled mixed state of a spin-$1/2$ baryon–antibaryon pair produced in the process $e^{+}{e}^{-}\to J/\psi ,{\psi }^{\prime }\to \mathcal{B}\overline{\mathcal{B}}$. We show that the spin entanglement of the system can increase following the decays $\mathcal{B}\to \mathcal{b}+M$ and $\overline{\mathcal{B}}\to \overline{\mathcal{b}}+\overline{M}$, where $\mathcal{b},\overline{\mathcal{b}}$ are spin-$1/2$ baryons and $M,\overline{M}$ are spin-0 mesons. This phenomenon, known as entanglement autodistillation, manifests as a probabilistic amplification of entanglement during the decay process. We analyze the underlying mechanism and show that this phenomenon depends only on the initial state of the $\mathcal{B}\overline{\mathcal{B}}$ system and the decay parameter ${\alpha }_D$, but not on the decay parameter ${\varphi }_D$. This effect only arises when parity is violated in the decay, when ${\alpha }_D\ne 0$.

Close

PrevNext

Reuse & PermissionsView figure in article

• 
• 
• 
• 
• 
• 
• 

• Hadronic decays
• Particle decays
• Phenomenology
• Quantum correlations in quantum information
• Spin
• Group theory