Does relativistic motion really freeze initially maximal entanglement?

• URL: http://arxiv.org/abs/2601.02976v1
• Date: Tue, 06 Jan 2026 12:36:31 GMT
• Title: Does relativistic motion really freeze initially maximal entanglement?
• Authors: Si-Han Li, Hui-Chen Yang, Rui-Yang Xu, Shu-Min Wu,
• Abstract summary: We show that the 1-3 bipartite entanglement of the $CL_4$ state remains strictly maximal for all accelerations, including the infinite-acceleration limit.<n>This result uncovers a previously unexplored phenomenon, namely the complete freezing of initially maximal entanglement" under relativistic motion.
• Score: 3.0567168695825377
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We investigate the relativistic dynamics of quantum entanglement in a four-qubit cluster ($CL_4$) state using a fully operational Unruh-DeWitt detector framework. Contrary to the widely held expectation that the Unruh effect inevitably degrades initially maximal entanglement, we demonstrate that the 1-3 bipartite entanglement of the $CL_4$ state remains strictly maximal for all accelerations, including the infinite-acceleration limit. This result uncovers a previously unexplored phenomenon, namely the ``complete freezing of initially maximal entanglement" under relativistic motion. To the best of our knowledge, this is the first identification and systematic characterization of such a phenomenon within a relativistic framework. These findings overturn the conventional view that acceleration universally diminishes maximal entanglement and establish the $CL_4$ state as a promising resource for quantum information processing in non-inertial or curved-spacetime settings.

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