The paper by Ting Yu and J. H. Eberly explores the dynamics of disentanglement in two initially entangled qubits under the influence of vacuum noise. They demonstrate that, contrary to common belief, disentanglement can occur in a finite time, while local decoherence processes take an infinite time. The authors use a model involving two two-level atoms coupled to separate cavities, where the interaction with the environment leads to both local decoherence and nonlocal disentanglement. By analyzing the system's Hamiltonian and the master equation, they show that the disentanglement rate is influenced by the nonlocal coherence of the qubits, which can be significantly faster than the sum of the individual decoherence rates. They provide a specific example where the disentanglement time is given by \(\ln(\frac{2+\sqrt{2}}{2})\) times the usual spontaneous lifetime. This finding highlights the importance of understanding the relationship between decoherence and disentanglement in quantum systems, which has implications for both fundamental quantum mechanics and practical quantum information applications.The paper by Ting Yu and J. H. Eberly explores the dynamics of disentanglement in two initially entangled qubits under the influence of vacuum noise. They demonstrate that, contrary to common belief, disentanglement can occur in a finite time, while local decoherence processes take an infinite time. The authors use a model involving two two-level atoms coupled to separate cavities, where the interaction with the environment leads to both local decoherence and nonlocal disentanglement. By analyzing the system's Hamiltonian and the master equation, they show that the disentanglement rate is influenced by the nonlocal coherence of the qubits, which can be significantly faster than the sum of the individual decoherence rates. They provide a specific example where the disentanglement time is given by \(\ln(\frac{2+\sqrt{2}}{2})\) times the usual spontaneous lifetime. This finding highlights the importance of understanding the relationship between decoherence and disentanglement in quantum systems, which has implications for both fundamental quantum mechanics and practical quantum information applications.