Photon counting as a probe of superfluidity in a two-band Bose-Hubbard system coupled to a cavity field.
We show that photon number measurement can be used to detect superfluidity for a two-band Bose-Hubbard model coupled to a cavity field. The atom-photon coupling induces transitions between the two internal atomic levels and results in entangled polaritonic states. In the presence of a cavity field, we find different photon numbers in the Mott-insulating versus superfluid phases, providing a method of distinguishing the atomic phases by photon counting. Furthermore, we examine the dynamics of the photon field after a rapid quench to zero atomic hopping by increasing the well depth. We find a robust correlation between the field's quench dynamics and the initial superfluid order parameter, thereby providing a novel and accurate method of determining the order parameter.
The Ohio State University, 191 W. Woodruff Avenue, Columbus, Ohio 43210, USA.
Sara
S
Rajaram
The Ohio State University, 191 W. Woodruff Avenue, Columbus, Ohio 43210, USA.
Nandini
N
Trivedi