Macroscopic displaced thermal field as the entanglement catalyst

TL;DR

This paper demonstrates that a macroscopic displaced thermal field can serve as an effective entanglement catalyst for multiple atoms, with entanglement generation unaffected by high photon numbers, even approaching infinity.

Contribution

It introduces a novel mechanism where a displaced thermal field acts as a catalyst for atomic entanglement, independent of photon-number size.

Findings

Entanglement can be generated via a displaced thermal field with large photon numbers.

The cavity field remains disentangled after the process.

Entanglement speed is unaffected by the thermal state's photon number.

Abstract

We show that entanglement of multiple atoms can arise via resonant interaction with a displaced thermal field with a macroscopic photon-number. The cavity field acts as the catalyst, which is disentangled with the atomic system after the operation. Remarkably, the entanglement speed does not decrease as the average photon-number of the mixed thermal state increases. The atoms may evolve to a highly entangled state even when the photon-number of the cavity mode approaches infinity.