Volume 77, Number 3, February 2007
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||05 February 2007|
Optical signatures of quantum phase transitions in a light-matter system
Centre for Quantum Computation and Department of Physics, Clarendon Laboratory, University of Oxford Oxford, OX1 3PU, UK
Accepted: 29 November 2006
Information about quantum phase transitions in conventional condensed matter systems, must be sought by probing the matter system itself. By contrast, we show that mixed matter-light systems offer a distinct advantage in that the photon field carries clear signatures of the associated quantum critical phenomena. Having derived an accurate, size-consistent Hamiltonian for the photonic field in the well-known Dicke model, we predict striking behavior of the optical squeezing and photon statistics near the phase transition. The corresponding dynamics resemble those of a degenerate parametric amplifier. Possible realizations include atom-cavity, nanostructure-cavity, and nanostructure-photonic-band-gap systems.
PACS: 42.50.Fx – Cooperative phenomena in quantum optical systems / 73.43.Nq – Quantum phase transitions / 32.80.-t – Photon interactions with atoms
© Europhysics Letters Association, 2007
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