Two-photon spontaneous emission in atomically thin plasmonic nanostructures

• URL: http://arxiv.org/abs/2006.15219v1
• Date: Fri, 26 Jun 2020 21:31:51 GMT
• Title: Two-photon spontaneous emission in atomically thin plasmonic nanostructures
• Authors: Y. Muniz, A. Manjavacas, C. Farina, D. A. R. Dalvit, and W. J. M. Kort-Kamp
• Abstract summary: Two-photon states are key quantum assets, but achieving them in individual emitters is challenging. We demonstrate that atomically thin plasmonic nanostructures can harness two-photon spontaneous emission. This paves the way to an alternative efficient source of light-matter entanglement for on-chip quantum information processing and free-space quantum communications.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The ability to harness light-matter interactions at the few-photon level plays a pivotal role in quantum technologies. Single photons - the most elementary states of light - can be generated on-demand in atomic and solid state emitters. Two-photon states are also key quantum assets, but achieving them in individual emitters is challenging because their generation rate is much slower than competing one-photon processes. We demonstrate that atomically thin plasmonic nanostructures can harness two-photon spontaneous emission, resulting in giant far-field two-photon production, a wealth of resonant modes enabling tailored photonic and plasmonic entangled states, and plasmon-assisted single-photon creation orders of magnitude more efficient than standard one-photon emission. We unravel the two-photon spontaneous emission channels and show that their spectral line-shapes emerge from an intricate interplay between Fano and Lorentzian resonances. Enhanced two-photon spontaneous emission in two-dimensional nanostructures paves the way to an alternative efficient source of light-matter entanglement for on-chip quantum information processing and free-space quantum communications.

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