Continuous-variable entanglement in a correlated spontaneous emission laser

Hua Tang Tan*, Shi Yao ZHU, M. Suhail Zubairy

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

115 Citations (Scopus)


We discuss the generation and evolution of entangled light in a correlated spontaneous emission laser. The master equation for the two-mode field in a cavity is derived and solved analytically. The time-dependent characteristic function in the Wigner representation for the two-mode field is obtained. It shows that the two-mode field in the cavity evolves in a two-mode Gaussian state. The entanglement degree of the two-mode field in the cavity increases initially, then decreases, and finally vanishes as the field evolves from an initial vacuum. The period of the entanglement is extended as the intensity of the driving field is increased. It is found that the entanglement still exists even when the two-mode squeezing disappears. During the entanglement period, the intensity of the field is amplified. The entanglement for the initial field being a two-mode squeezed vacuum and the entanglement of the output field are also discussed.

Original languageEnglish
Article number022305
JournalPhysical Review A
Issue number2
Publication statusPublished - Aug 2005

Scopus Subject Areas

  • Atomic and Molecular Physics, and Optics


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