When in close contact, plasmonic resonances interact and become strongly correlated. In this work we develop a quantum mechanical model for an array of coupled particle plasmons. This model predicts that when the coupling strength between plasmons approaches or surpasses the local dissipation, a sizable amount of entanglement is stored in the collective modes of the array. We also prove that entanglement manifests itself in far-field images of the plasmonic modes, through the statistics of the quadratures of the field, in what constitutes a novel family of entanglement witnesses. Finally, we estimate the amount of entanglement, the coupling strength and the correlation properties for a system that consists of two or more coupled nanospheres of silver, showing evidence that our predictions could be tested using present-day state-of-the-art technology. © 2014 American Physical Society.
CITATION STYLE
Del Pino, J., Feist, J., García-Vidal, F. J., & García-Ripoll, J. J. (2014). Entanglement detection in coupled particle plasmons. Physical Review Letters, 112(21). https://doi.org/10.1103/PhysRevLett.112.216805
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