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General structure of two-photon S matrix in waveguide quantum electrodynamics systems containing a local quantum system with multiple ground states

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arxiv 1610.01727 v1 pith:ZV66FZAA submitted 2016-10-06 quant-ph

classification quant-ph
keywords quantumgroundmatrixmultiplestatessystemtwo-photongeneral
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We present the general structure of two-photon S matrix for a waveguide coupled to a local quantum system that supports multiple ground states. The presence of the multiple ground states results in a non-commutative aspect of the system with respect to the exchange of the orders of photons. Consequently, the two-photon S matrix significantly differs from the standard form as described by the cluster decomposition principle in the quantum field theory.

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