Physics – Quantum Physics
Scientific paper
2002-11-25
Physical Review A 68, 046301 (2003)
Physics
Quantum Physics
v2: 2 pages. Unchanged except for a clarification in the next to last paragraph of the text, v3: 3 pages. Various editing chan
Scientific paper
10.1103/PhysRevA.68.046301
A recent discussion of quantum limitations to the fidelity with which superpositions of internal atomic energy levels can be generated by an applied, quantized, laser pulse is shown to be based on unrealistic physical assumptions. This discussion assumed the validity of Jaynes-Cummings dynamics for an atom interacting with a laser field in free space, that is, when the atom is not surrounded by a resonant cavity. If the laser field is a multimode quantum coherent state, and the Rabi frequency is much greater than the spontaneous decay rate, then the total atomic decoherence rate is on the order of the spontaneous decay rate. With the use of a unitary transformation of the field states due to Mollow, it can be shown that the atomic decoherence rate is the same as if the laser field were treated classically, without any additional contribution due to the quantum nature of the laser field.
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