Photonic Spectral Density of Coupled Optical Cavities¹

K. Ziegler

Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany

e-mail: klaus.ziegler@physik.uni-augsburg.de

Received July 26, 2011; in final form August 4, 2011; published online November 28, 2011

Abstract—We study a pair of anharmonic optical cavities that is connected by an optical fiber. The photonic
spectral density characterizes the evolution of the coupled cavities after the system has been prepared in a Fock
or N00N state. We evaluate the photonic spectral density within the recursive projection method and find that
the anharmonicity leads to a collapse of the low-energy spectrum. The level spacing of the remaining spectrum
agrees quite well with that of the harmonic cavities, whereas the spectral weights are strongly affected by the
anharmonicity.

DOI: 10.1134/S1054660X1201032X

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