Physics – Quantum Physics
Scientific paper
2007-09-19
Physics
Quantum Physics
16 pages, 7 eps figures; improved version as submitted to Phys. Rev. A
Scientific paper
10.1103/PhysRevA.78.013822
Within the framework of exact quantum electrodynamics in dispersing and absorbing media, we have studied the quantum state of the radiation emitted from an initially in the upper state prepared two-level atom in a high-$Q$ cavity, including the regime where the emitted photon belongs to a wave packet that simultaneously covers the areas inside and outside the cavity. For both continuing atom--field interaction and short-term atom--field interaction, we have determined the spatio-temporal shape of the excited outgoing wave packet and calculated the efficiency of the wave packet to carry a one-photon Fock state. Furthermore, we have made contact with quantum noise theories where the intracavity field and the field outside the cavity are regarded as approximately representing independent degrees of freedom such that two separate Hilbert spaces can be introduced.
Fidio Christian Di
Khanbekyan Mikayel
Vogel Werner
Welsch Dirk-Gunnar
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