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Abstract

In the previous chapter the atom-light interaction for a single atom was assumed to describe the behaviour of a macroscopic sample, calculating the susceptibility of a uniform gas with density \(\rho \) using the single atom density matrix. This description is valid providing the atoms are both independent and identical. In some circumstances the atoms behave independently but the overall response of the system depends on the sum over all atoms. This is known as collective behaviour. An example is spin-echo, where each atom dephases at a different rate but reversing the phase leads to a restoration of the initial state, resulting in a collective emission.

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Notes

  1. 1.

    Comparison of \(\fancyscript{H}_{\mathrm{ dd} }\) to \(D_{12}\) in Eq. (9) of [6] yields \(D_{12}\equiv 2\,{\mathrm{ i} }\fancyscript{H}_{\mathrm{ dd} }/\hbar \Gamma \).

  2. 2.

    The Hadamard product defines element-wise multiplication of matrices \(A\) and \(B\) such that \([A\circ B]_{i,j}=[A]_{i,j}\cdot [B]_{i,j}\) (see e.g.[39], p. 205).

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Correspondence to Jonathan D. Pritchard .

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Pritchard, J.D. (2012). Cooperative Phenomena. In: Cooperative Optical Non-Linearity in a Blockaded Rydberg Ensemble. Springer Theses. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-29712-0_5

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  • DOI: https://doi.org/10.1007/978-3-642-29712-0_5

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