Room-temperature strong coupling in a single-photon emitter-metasurface system

T. Thu Ha Do, Milad Nonahal, Chi Li, Vytautas Valuckas, Hark Hoe Tan, Arseniy I. Kuznetsov, Hai Son Nguyen (), Igor Aharonovich () and Son Tung Ha ()
Additional contact information
T. Thu Ha Do: Technology and Research)
Milad Nonahal: University of Technology Sydney
Chi Li: University of Technology Sydney
Vytautas Valuckas: Technology and Research)
Hark Hoe Tan: The Australian National University
Arseniy I. Kuznetsov: Technology and Research)
Hai Son Nguyen: UMR5270
Igor Aharonovich: University of Technology Sydney
Son Tung Ha: Technology and Research)

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Solid state single-photon sources with high brightness and long coherence time are promising qubit candidates for modern quantum technology. To prevent decoherence processes and preserve the integrity of the qubits, decoupling the emitters from their surrounding environment is essential. To this end, interfacing single photon emitters (SPEs) with high-finesse cavities is required, especially in the strong coupling regime, when the interaction between emitters can be mediated by cavity fields. However, achieving strong coupling at elevated temperatures is challenging due to competing incoherent processes. Here, we address this long-standing problem by using a quantum system, which comprises a class of SPEs in hexagonal boron nitride and a dielectric cavity based on bound states in the continuum (BIC). We experimentally demonstrate, at room temperature, strong coupling of the system with a large Rabi splitting of ~4 meV thanks to the combination of the narrow linewidth and large oscillator strength of the emitters and the efficient photon trapping of the BIC cavity. Our findings unveil opportunities to advance the fundamental understanding of quantum dynamical system in strong coupling regime and to realise scalable quantum devices capable of operating at room temperature.

Date: 2024
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DOI: 10.1038/s41467-024-46544-w

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