Figure 5

Time-dependent coherence g⁽¹⁾(t) for correlated N00N state, \(|\psi (0)\rangle =(|N,0\rangle +|0,N\rangle )/\sqrt{2}\), with (a–c) N = 2 and (d–f) N = 5. Blue and red show the real and imaginary part of the optomechanical coherence g⁽¹⁾(t) respectively. Solid and dashed lines correspond to Lindblad master equation and non-Hermitian Hamiltonian evolution, in that order. Surprisingly, the coherence is maximum at the exceptional point.