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Detecting quantum phase transitions of photons through a defect cavity

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Published 31 August 2011 Published under licence by IOP Publishing Ltd
, , Citation Jiun-Yi Lien et al 2011 New J. Phys. 13 083036DOI 10.1088/1367-2630/13/8/083036

1367-2630/13/8/083036

Abstract

The quantum phase transition of photons between the Mott-insulating and superfluid states can take place in a periodic array of nanocavities, where the photons are strongly coupled to a two-level system inside each cavity. Here we consider a defect cavity inside the array structure and examine the dynamics of the corresponding photons using the non-equilibrium formalism. The global signatures of the phase transition, such as the compressibility and order parameter, are revealed in the defect-cavity photon number. Furthermore, an open electron transport device (a transport qubit) can be embedded in the defect cavity for the detection of the quantum phase transition.

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