1203.1458 (Shi-Biao Zheng)

Macroscopic superposition and entanglement for displaced thermal fields
induced by a single atom    [PDF]

Shi-Biao Zheng

We show that a cavity field can evolve from an initial displaced mixed thermal state to a macroscopic superpositions of displaced thermal states via resonant interaction with a two-level atom. As a macroscopic system (meter) is really in a mixed state before coupling with the microscopic system at some temperature, our result is important for studying the quantum measurement problem and decoherence under real conditions. For the two-mode case, entanglement of displaced thermal states between the modes can be obtained.

View original: http://arxiv.org/abs/1203.1458