Quantum systems coupled to a structured reservoir with multiple excitations

@article{Nikolopoulos1999QuantumSC,
  title={Quantum systems coupled to a structured reservoir with multiple excitations},
  author={Georgios M. Nikolopoulos and S{\o}ren Bay and Peter Lambropoulos},
  journal={Physical Review A},
  year={1999},
  volume={60},
  pages={5079-5082}
}
We present a method for dealing with quantum systems coupled to a structured reservoir with any density of modes and with more than one excitation. We apply the method to a two-level atom coupled to the edge of a photonic band gap and a defect mode. Results pertaining to this system provide the solution to the problem of two photons in the reservoir, and a possible generalization is discussed. 
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