Universal and Tunable Sudden Freezing of Entanglement Volume

TL;DR

This paper explores the phenomenon of entanglement freezing in quantum systems, generalizing it to N-qubit systems, demonstrating control over freezing parameters, and establishing its universality across different models.

Contribution

It extends the understanding of entanglement freezing from atom-cavity systems to general N-qubit systems and introduces methods to control and achieve permanent freezing.

Findings

Entanglement can be abruptly frozen in diverse quantum systems.

Control over freezing time and value is achievable.

Permanent entanglement freezing is possible and universally occurs in various models.

Abstract

In a system where two identical two-level atoms interact with their common one-mode cavity field, it is shown that entanglement can become abruptly frozen in time, remaining at a constant value for a period of time until it begins to thaw from this value from the entanglement sharing perspective [Ding et al., Phys. Rev. A 103, 032418 (2021)]. We generalize this exotic behavior of entanglement sharing dynamics to more general systems with arbitrary N qubits, instead of restricting to the atom-cavity mode interaction system. We also demonstrate methods to control the entanglement freezing time and freezing value, and we discover a nontrivial dynamics where entanglement is frozen permanently. In addition, we show that this phenomenon is not a coincidence but a universal feature in a variety of systems with a geometric explanation of the mechanisms.