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Quantum Critical Analog of Cloud Chamber | | Jin-Feng Huang
; Yong Li
; Jie-Qiao Liao
; Le-Man Kuang
; C. P. Sun
; | | Date: |
10 Feb 2009 | | Abstract: | The usual cloud chamber is constructed based on the dynamical sensitivity due
to the usual phase transition, in which a microscopic particle to be detected
induces the classical phase transition of the supercooled, supersaturated water
or alcohol vapor. In this paper we proposed a dynamic model for the similar
amplification phenomenon, which results from quantum phase transition (QPT).
Here our cloud chamber-like object is an atomic ensemble interacting with the
quantized light field, which is described by the Dicke model. An extra atom,
coupling with this optical field at large detuning, can behave as a microscopic
particle to be detected by the cloud chamber. When the Dicke model experiences
a QPT, the decoherence of the extra atom, which is initially prepared in a pure
state, will show an explicit sudden change in dynamics. Then the extra atom
plays the similar role to the particle detected in the cloud chamber. We
calculate the Loschmidt Echo in different region around the critical point,
which demonstrates the dynamic sensitivity of the Dicke model. | | Source: | arXiv, 0902.1575 | | Services: | Forum | Review | PDF | Favorites | |
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