Comment on Some Implications of the Quantum Nature of Laser Fields for Quantum Computations
Wayne M. Itano
A recent discussion of quantum limitations to the Fidelity with which superpositions of internal atomic energy levels can be generated by an applied laser pulse is shown to be in error. This discussion incorrectly assumed the validity of Jaynes-Cummings dynamics for an atom interacting with a laser field in free space, leading to entanglement of the atom and field systems and effective decoherence of the atomic system. If the field of the laser pulse is a multimode coherent state, then there is no decoherence of the atomic state, beyond that which can be attributed to spontaneous emission.
Physical Review A (Atomic, Molecular and Optical Physics)
Comment on Some Implications of the Quantum Nature of Laser Fields for Quantum Computations, Physical Review A (Atomic, Molecular and Optical Physics), [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=841699
(Accessed October 28, 2021)