Higher excitation reduces entanglement but preserves coherence

What the study found: Under the Hawking effect in Schwarzschild spacetime, increasing the excitation number q reduces quantum entanglement and mutual information, while enhancing quantum coherence.
Why the authors say this matters: The authors suggest that, in gravitational settings, lower q is favorable for maintaining entanglement, while higher q may be useful for tasks that depend on quantum coherence in relativistic quantum information processing.
What the researchers tested: The study examined arbitrary q-th excited states, rather than only the vacuum state |0⟩ and first excited state |1⟩, in multipartite quantum systems. It analyzed how the Hawking effect influences quantum entanglement and coherence in Schwarzschild spacetime.
What worked and what didn't: The results show that increasing q weakens quantum correlations as measured by entanglement and mutual information. At the same time, higher q strengthens quantum coherence, so the two resources respond in opposite ways.
What to keep in mind: The abstract does not describe detailed limitations or broader scope constraints beyond the focus on multipartite states in Schwarzschild spacetime.

Key points

• Increasing the excitation number q reduces quantum entanglement under the Hawking effect.
• Increasing q also reduces mutual information, a measure of shared information between parts of a system.
• Higher q enhances quantum coherence in the studied multipartite states.
• The authors suggest lower q helps preserve entanglement in gravitational settings.
• The study focuses on arbitrary q-th excited states in Schwarzschild spacetime.