Entanglement detection in coupled particle plasmons

Abstract

When in close contact, plasmonic resonances interact and become strongly correlated. In this work we develop a quantum mechanical model, using the language of continuous variables and quantum information, 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. This protocol is so robust that it is indeed independent of whether our own model is correct. 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.

8 pages (6 main text + 2 supplemental), 3 figures

References in corpus (4)

• Entanglement detection
• Quantum Plasmonics
• Entanglement of two qubits mediated by one-dimensional plasmonic waveguides
• Dirac-like plasmons in honeycomb lattices of metallic nanoparticles

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• Entangled microwaves as a resource for entangling spatially separate solid-state qubits: superconducting qubits, NV centers and magnetic molecules
• Coupling, lifetimes and "strong coupling" maps for single molecules at plasmonic interfaces
• Quantization of electromagnetic modes and angular momentum on plasmonic nanowires
• Quantum Metamaterials: Applications in quantum information science