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Cavity-mediated collective emission from steady-state subradiance
Kyu-Young Kim1, Jin Hee Lee1, Woong Bae Jeon1
1Department of Physics, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea.
Nature Communications
|July 9, 2025
Summary
Researchers demonstrate steady-state subradiance in quantum dots, a dark state with potential for quantum information technologies. This controlled subradiance shows strong photon bunching and suppressed decay, paving the way for harnessing quantum correlations.
Area of Science:
- Quantum Optics
- Quantum Information Science
- Condensed Matter Physics
Background:
- Cooperative effects in quantum systems, like superradiance and subradiance, stem from interactions among quantum emitters.
- While superradiant states are well-studied, subradiant states are less explored due to their dark nature, despite their potential for quantum resources.
- Subradiance is crucial for advancing quantum information technologies due to its capacity for long-lived and large-scale entanglement.
Purpose of the Study:
- To demonstrate strong collective emission from a cavity-mediated steady-state subradiant state.
- To explore the potential of subradiant states as a quantum resource.
- To investigate the manipulation of collective interactions in a tailored photonic environment.
Main Methods:
- Utilizing two quantum dots coupled to a low-Q cavity in a tailored photonic environment.
- Achieving a steady-state population in a subradiant state through balanced cavity dissipation, emitter-field coupling, and incoherent pumping.
- Characterizing the subradiant state via photon bunching (g(2)(0) > 8) and suppressed single-photon decay (36 ns).
Main Results:
- Demonstrated a steady-state subradiant state in a cavity-mediated system.
- Observed strong photon bunching (g(2)(0) > 8) as a signature of steady-state subradiance.
- Achieved suppressed single-photon decay (36 ns), indicating long-lived quantum correlations.
- Showcased the manipulability of collective interactions by controlling system parameters like detuning and dephasing via numerical simulations.
Conclusions:
- Cavity-mediated subradiance can be achieved and controlled in a system of quantum dots.
- This work provides a pathway for generating and harnessing quantum correlations among quantum emitters through controlled dissipation.
- The demonstrated steady-state subradiance offers a promising avenue for advancing quantum information technologies.
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