Moving Atom-Field Interactions: Quantum Motional Decoherence and Relaxation

Details Moving Atom-Field Interactions: Quantum Motional Decoherence and Relaxation Moving Atom-Field Interactions: Quantum Motional Decoherence and Relaxation

2003-01-31

arxiv.org/abs/quant-ph/0301180v3

Phys. Rev. A 68, 012110 (2003)

Physics

Quantum Physics

9 pages, 1 figure, minor changes

Scientific paper

10.1103/PhysRevA.68.012110

The reduced dynamics of an atomic qubit coupled both to its own quantized center of mass motion through the spatial mode functions of the electromagnetic field, as well as the vacuum modes, is calculated in the influence functional formalism. The formalism chosen can describe the entangled non-Markovian evolution of the system with a full account of the coherent back-action of the environment on the qubit. We find a slight increase in the decoherence due to the quantized center of mass motion and give a condition on the mass and qubit resonant frequency for which the effect is important. In optically resonant alkali-metal atom systems, we find the effect to be negligibly small. The framework presented here can nevertheless be used for general considerations of the coherent evolution of qubits in moving atoms in an electromagnetic field.

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