Journal
NATURE PHOTONICS
Volume 16, Issue 8, Pages 566-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41566-022-01019-6
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Funding
- Engineering and Physical Sciences Research Council [EP/N031776/1, EP/V026496/1]
- QUANTERA project Interpol [EP/R04385X/1, ANR-QUAN-0003-05]
- Paris Ile-de-France Region
- ERC StG ARQADIA [949730]
- ERC CoG EMERGENTOPO [865151]
- Marie Skodowska-Curie individual fellowship ToPol
- H2020-FETFLAG project PhoQus [820392]
- French RENATECH network
- UK EPSRC New Investigator Award [EP/V00171X/1]
- Labex CEMPI [ANR-11-LABX-0007]
- IRF (project 'Hybrid polaritonics')
- Priority 2030 Federal Academic Leadership Program
- European Research Council (ERC) [949730, 865151] Funding Source: European Research Council (ERC)
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Photonic platforms are ideal for quantum technologies due to weak photon-environment coupling and interactions between photons. This study demonstrates that the required nonlinearity can be achieved using exciton-polaritons in micropillars with embedded quantum wells, and observes the effect of cross-phase modulation.
Photonic platforms are an excellent setting for quantum technologies as weak photon-environment coupling ensures long coherence times. The second key ingredient for quantum photonics is interactions between photons, which can be provided by optical nonlinearities in the form of cross-phase modulation. This approach underpins many proposed applications in quantum optics(1-7) and information processing(8), but achieving its potential requires strong single-photon-level nonlinear phase shifts as well as scalable nonlinear elements. In this work we show that the required nonlinearity can be provided by exciton-polaritons in micropillars with embedded quantum wells. These combine the strong interactions of excitons(9,10) with the scalability of micrometre-sized emitters(11). We observe cross-phase modulation of up to 3 +/- 1 mrad per polariton using laser beams attenuated to below the average intensity of a single photon. With our work serving as a stepping stone, we lay down a route for quantum information processing in polaritonic lattices.
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