Entanglement dynamics in anti- <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi mathvariant="script">PT</mml:mi></mml:math> -symmetric systems

In the past years, many efforts have been made to study various noteworthy phenomena in both parity-time ($\mathcal{PT}$) and anti-parity-time ($\mathcal{APT}$) symmetric systems. However, entanglement dynamics $\mathcal{APT}$-symmetric systems has not previously investigated theory experiments. Here, we investigate evolution of two qubits an system. unbroken regime, our theoretical simulations demonstrate periodic oscillations when each qubit evolves identically, while nonperiodic differently. particular, near exceptional point there exist sudden vanishing revival. Moreover, rapid decay delayed death provided one broken regime. this work, also perform experiment with a linear optical setup. The experimental results agree well simulation results. Our findings reveal novel system opens new direction for future studies on quantum multiqubit or other non-Hermitian