Single-photon nonlinearity at room temperature

Anton V. Zasedatelev (), Anton V. Baranikov, Denis Sannikov, Darius Urbonas, Fabio Scafirimuto, Vladislav Yu. Shishkov, Evgeny S. Andrianov, Yurii E. Lozovik, Ullrich Scherf, Thilo Stöferle, Rainer F. Mahrt and Pavlos G. Lagoudakis ()
Additional contact information
Anton V. Zasedatelev: Skolkovo Institute of Science and Technology
Anton V. Baranikov: Skolkovo Institute of Science and Technology
Denis Sannikov: Skolkovo Institute of Science and Technology
Darius Urbonas: IBM Research Europe - Zurich
Fabio Scafirimuto: IBM Research Europe - Zurich
Vladislav Yu. Shishkov: Skolkovo Institute of Science and Technology
Evgeny S. Andrianov: Skolkovo Institute of Science and Technology
Yurii E. Lozovik: Skolkovo Institute of Science and Technology
Ullrich Scherf: Bergische Universität Wuppertal
Thilo Stöferle: IBM Research Europe - Zurich
Rainer F. Mahrt: IBM Research Europe - Zurich
Pavlos G. Lagoudakis: Skolkovo Institute of Science and Technology

Nature, 2021, vol. 597, issue 7877, 493-497

Abstract: Abstract The recent progress in nanotechnology1,2 and single-molecule spectroscopy3–5 paves the way for emergent cost-effective organic quantum optical technologies with potential applications in useful devices operating at ambient conditions. We harness a π-conjugated ladder-type polymer strongly coupled to a microcavity forming hybrid light–matter states, so-called exciton-polaritons, to create exciton-polariton condensates with quantum fluid properties. Obeying Bose statistics, exciton-polaritons exhibit an extreme nonlinearity when undergoing bosonic stimulation6, which we have managed to trigger at the single-photon level, thereby providing an efficient way for all-optical ultrafast control over the macroscopic condensate wavefunction. Here, we utilize stable excitons dressed with high-energy molecular vibrations, allowing for single-photon nonlinear operation at ambient conditions. This opens new horizons for practical implementations like sub-picosecond switching, amplification and all-optical logic at the fundamental quantum limit.

Date: 2021
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DOI: 10.1038/s41586-021-03866-9

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