Data di Pubblicazione:
2005
Citazione:
Atomic correlations and cavity field decoherence in a strongly driven micromaser / F. Casagrande, A. Lulli. - In: JOURNAL OF OPTICS. - ISSN 1464-4266. - 7:12(2005), pp. S437-S444.
Abstract:
In a micromaser where a classical field strongly drives the atoms
while they cross the cavity, remarkable atom-atom correlations show
up at steady-state, which vanish much faster than dissipative decay.
Hence we consider atom pair correlation measurements in which the
detection of the first probe atom prepares a mesoscopic
superposition state of the cavity field, that entangles with a
second probe atom. The conditional probabilities for the latter
atomic detection provide a description of the decoherence of the
superposition state, occurring in an open system in the presence of
pumping, driving, dissipative, and thermal effects. The decoherence
rate scales as the squared interaction time, that sets the
separation in phase space between the superposition components,
whereas the quantum coherence is unaffected by the atomic pumping.
Hence we further investigate the system when the cavity is not
pumped. Starting the correlation measurements from a thermal state,
we can describe the effect of temperature on decoherence. Starting
from a vacuum state, the superposition states are maximally
separated Schrödinger cat states, whose decoherence can be thus
monitored.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Decoherence, cat states, cavity QED, micromaser
Elenco autori:
F. Casagrande, A. Lulli
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