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Two-plasmon quantum interference

Fakonas, James S. and Lee, Hyunseok and Kelaita, Yousif A. and Atwater, Harry A. (2014) Two-plasmon quantum interference. Nature Photonics, 8 (4). pp. 317-320. ISSN 1749-4885.

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Surface plasma waves on metals arise from the collective oscillation of many free electrons in unison. These waves are usually quantized by direct analogy to electromagnetic fields in free space, with the surface plasmon, the quantum of the surface plasma wave, playing the same role as the photon. It follows that surface plasmons should exhibit all the same quantum phenomena that photons do. Here, we report a plasmonic version of the Hong–Ou–Mandel experiment, in which we observe unambiguous two-photon quantum interference between plasmons, confirming that surface plasmons faithfully reproduce this effect with the same visibility and mutual coherence time, to within measurement error, as in the photonic case. These properties are important if plasmonic devices are to be employed in quantum information applications, which typically require indistinguishable particles.

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Additional Information:© 2014 Macmillan Publishers Limited. Received 08 October 2013. Accepted 29 January 2014. Published online 02 March 2014. This work was supported by the Air Force Office of Scientific Research under MURI awards FA9550-12-1-0488 (J.S.F.), FA9550-12-1-0024 (H.L.) and FA9550-04-1-0434 (Y.A.K.). The authors thank the Kavli Nanoscience Institute at Caltech for access to and maintenance of fabrication equipment. Additionally, J.S.F. would like to thank R.M. Briggs for fabrication training and advice. The authors declare no competing financial interests. Author contributions: J.S.F. and H.A.A. designed the experiment. J.S.F. and Y.A.K. built and tested the SPDC source. J.S.F. and H.L. built and tested the waveguide-coupling set-up. J.S.F. fabricated the waveguides. H.L. performed the measurements of quantum interference. All authors contributed to writing the manuscript.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0488
Air Force Office of Scientific Research (AFOSR)FA9550-12-1-0024
Air Force Office of Scientific Research (AFOSR) FA9550-04-1-0434
Record Number:CaltechAUTHORS:20140311-083026860
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44235
Deposited By: Ruth Sustaita
Deposited On:12 Mar 2014 15:35
Last Modified:20 Mar 2015 00:12

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