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Published on: June 28, 2016
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Nonlinear Rydberg exciton-polaritons in Cu2O microcavities
Maxim Makhonin1, Anthonin Delphan2, Kok Wee Song3
1Department of Physics and Astronomy, University of Sheffield, Sheffield, S3 7RH, UK. m.makhonin@sheffield.ac.uk.
Light, Science & Applications
|February 6, 2024
Summary
We demonstrate strong optical nonlinearity in polaritons using Rydberg blockade. This phenomenon, observed in copper oxide microresonators, enhances photon-photon interactions for quantum applications.
Area of Science:
- Condensed matter physics
- Quantum optics
Background:
- Rydberg excitons are highly excited electron-hole states with large Bohr radii.
- Exciton interactions and light coupling can lead to strong optical nonlinearity, useful for sensing and quantum information processing.
Purpose of the Study:
- To achieve strong effective photon-photon interactions via Rydberg blockade in a polariton system.
- To investigate the scaling of polariton nonlinearity with principal quantum numbers.
Main Methods:
- Utilizing a Cu2O-filled microresonator to form hybrid excitons and photons (polaritons).
- Employing pulsed resonant excitation and analyzing polariton resonance frequency renormalization.
- Applying theoretical analysis to understand the role of Rydberg blockade.
Main Results:
- Observed strong effective photon-photon interactions (Kerr-like optical nonlinearity) through Rydberg blockade.
- Demonstrated polariton resonance frequency renormalization due to reduced photon-exciton coupling with increasing exciton density.
- Experimentally verified the scaling of the polariton nonlinearity coefficient as ∝ n⁴.⁴±¹·⁸ for principal quantum numbers up to n=7.
Conclusions:
- Rydberg blockade is crucial for achieving high optical nonlinearities in polaritons.
- Studying high principal quantum numbers in polariton systems is essential for quantum optical applications.
- This work opens avenues for fundamental studies of strongly correlated photonic states in solids.
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