Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

arXiv:2604.19666

Indistinguishablity from dephased emitters using combined plasmonic-dielectric cavities

Anastasios Fasoulakis, Ross C. Schofield, Rupert F. Oulton, Alex S. Clark

quant-phphysics.opticsSubmitted Apr 21, 2026• Announced Apr 22, 2026
arXivHTMLPDF

Abstract

The concept of cavity funneling has emerged recently as a promising route towards creating indistinguishable photons from highly dephased emitters. So far, all suggested solutions are solely based on dielectric cavities that require extremely high quality factors that are difficult to reach at visible wavelengths. Here we suggest a hybrid funneling architecture where a dephased emitter is coupled to a plasmonic nanoresonator that is enclosed by an outer dielectric cavity. The estimated lower limit of the outer cavity quality factor is found to be $\sim2$ orders of magnitude lower compared to a cascaded cavity system. Furthermore, the surrounding topology of our approach allows for a partial direct coupling between the emitter and the outer cavity which in turn can increase the overall system extraction efficiency $\left(β\right)$ by a factor of 12, boosting the probability of photon collection.

Related papers

Cascaded Cavities Boost the Indistinguishability of Imperfect Quantum Emitters

Hyeongrak Choi, Di Zhu, Yoseob Yoon +1 more

Recently, Grange et al. [Phys. Rev. Lett. 114, 193601 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.193601] showed the possibility of single-photon generation with a high indistinguishability from a quantum emitter despite strong pure dephasing, by "funneling" emission into a photonic cavity. Here, we show that a cascaded two-cavity system can further improve the photon characteristics and greatly reduce the Q factor requirement to levels achievable with present-day technology. Our approach leverages recent advances in nanocavities with an ultrasmall mode volume and does not require ultrafast excitation of the emitter. These results were obtained by numerical and closed-form analytical models with strong emitter dephasing, representing room-temperature quantum emitters.

arXiv:1809.01645•Physical Review Letters•May 10, 2019•47 citations

Cavity-Funneled Generation of Indistinguishable Single Photons from Strongly Dissipative Quantum Emitters

Thomas Grange, Gaston Hornecker, David Hunger +4 more

We investigate theoretically the generation of indistinguishable single photons from a strongly dissipative quantum system placed inside an optical cavity. The degree of indistinguishability of photons emitted by the cavity is calculated as a function of the emitter-cavity coupling strength and the cavity linewidth. For a quantum emitter subject to strong pure dephasing, our calculations reveal that an unconventional regime of high indistinguishability can be reached for moderate emitter-cavity coupling strengths and high-quality factor cavities. In this regime, the broad spectrum of the dissipative quantum system is funneled into the narrow line shape of the cavity. The associated efficiency is found to greatly surpass spectral filtering effects. Our findings open the path towards on-chip scalable indistinguishable-photon-emitting devices operating at room temperature.

arXiv:1501.00931•Physical Review Letters•May 11, 2015•101 citations

Highly Indistinguishable Room Temperature Single Photon Sources with Quantum Emitters in Bad Cavity Regime

Hyeongrak Choi, Di Zhu, Dirk Englund

We propose room temperature indistinguishable single photon sources based on quantum emitters in solid and nanophotonic cavities. Our approach does not require ultrafast pumping as plasmonic approaches and ultra-high quality factor cavity as funneling regime.

Conference on Lasers and Electro-Optics•Jan 1, 2018•1 citation

Feasibility of efficient room-temperature solid-state sources of indistinguishable single photons using ultrasmall mode volume cavities

Stephen C. Wein, Nikolai Lauk, Roohollah Ghobadi +1 more

Highly efficient sources of indistinguishable single photons that can operate at room temperature would be very beneficial for many applications in quantum technology. We show that the implementation of such sources is a realistic goal using solid-state emitters and ultrasmall mode volume cavities. We derive and analyze an expression for photon indistinguishability that accounts for relevant detrimental effects, such as plasmon-induced quenching and pure dephasing. We then provide the general cavity and emitter conditions required to achieve efficient indistinguishable photon emission and also discuss constraints due to phonon sideband emission. Using these conditions, we propose that a nanodiamond negatively charged silicon-vacancy center combined with a plasmonic-Fabry-P\'erot hybrid cavity is an excellent candidate system.

arXiv:1710.03742•Physical review. B./Physical review. B•May 14, 2018•43 citations

Αποδοτική εκπομπή μονοφωτονίων υψηλής μη-διακρισιμότητας χρησιμοποιώντας ισχυρή σύζευξη φωτός-ύλης

Νικόλαος Διαβολίτσης

The goal of this thesis is to explore and develop efficient methods for generating indistinguishable single photons. By examining quantum emitters strongly coupled to either singlemode cavities or plasmonic nanostructures, the dynamics and interactions that lead to single photon efficient generation with high degree of indistinguishability are investigated. This study begins with the theoretical background, introducing the JaynesCummings Hamiltonian and the Lindblad equation, which are essential for understanding the systemreservoir interaction in open quantum systems. Then we show how the photon indistinguishability can be achieved and quantified. Finally, using the quantum regression theorem, the correlation functions which are useful for the calculation of the indistinguishability are derived. This investigation includes both coherent and incoherent coupling regimes, revealing how different parameters, such as coupling strength and cavity decay rate, affect the efficiency and indistinguishability of the emitted photons. Numerical and detailed analytical methods are used to calculate the efficiency and the degree of indistinguishability, providing a comprehensive understanding of the factors that influence photon emission. The obtained results show that high photon indistinguishability and efficiency are achievable under specific conditions. For instance, in the case of a quantum emitter coupled to a plasmonic nanostructure, it is found that under the quasistatic approximation, the system is mathematically identical to the simpler system of a quantum emitter coupled to a leaky cavity. Using the results obtained for the quantum emitter leaky cavity case, it is shown that the more complex, quantum emitter and a plasmonic nanostructure system can produce highly indistinguishable photons with efficiency close to unity under optimal conditions. Additionally, the impact of pure dephasing on photon indistinguishability are analyzed. The findings of this thesis contribute to the advancement of quantum optics and quantum technologies, providing a foundation for developing practical quantum light sources for future technologies.

•Jul 9, 2024•0 citations

Photon statistics in collective strong coupling: Nanocavities and microcavities

Rocío Sáez‐Blázquez, Johannes Feist, Francisco José García-Vidal +1 more

There exists a growing interest in the properties of the light generated by hybrid systems involving a mesoscopic number of emitters as a means of providing macroscopic quantum light sources. In this work, the quantum correlations of the light emitted by a collection of emitters coupled to a generic optical cavity are studied theoretically using an effective Hamiltonian approach. Starting from the single-emitter level, we analyze the persistence of photon antibunching as the ensemble size increases. Not only is the photon blockade effect identifiable, but photon antibunching originated from destructive interference processes, the so-called unconventional antibunching, is also present. We study the dependence of these two types of negative correlations on the spectral detuning between cavity and emitters, as well as its evolution as the time delay between photon detections increases. Throughout this work, the performance of plasmonic nanocavities and dielectric microcavities is compared: despite the distinct energy scales and the differences introduced by their respectively open and closed character, the bunching and antibunching phenomenology presents remarkable similarities in both types of cavities.

arXiv:1802.08607•Physical Review A•Jul 25, 2018•42 citations
The concept of cavity funneling has emerged recently as a promising route towards creating indistinguishable photons from highly dephased emitters. So far, all suggested solutions are solely based on dielectric cavities that require extremely high quality factors that are difficult to reach at visible wavelengths. Here we suggest a hybrid funneling architecture where a dephased emitter is coupled to a plasmonic nanoresonator that is enclosed by an outer dielectric cavity. The estimated lower limit of the outer cavity quality factor is found to be ∼2\sim2∼2 orders of magnitude lower compared to a cascaded cavity system. Furthermore, the surrounding topology of our approach allows for a partial direct coupling between the emitter and the outer cavity which in turn can increase the overall system extraction efficiency (β)\left(β\right)(β) by a factor of 12, boosting the probability of photon collection.
Recently, Grange et al. [Phys. Rev. Lett. 114, 193601 (2015)PRLTAO0031-900710.1103/PhysRevLett.114.193601] showed the possibility of single-photon generation with a high indistinguishability from a quantum emitter despite strong pure dephasing, by "funneling" emission into a photonic cavity. Here, we show that a cascaded two-cavity system can further improve the photon characteristics and greatly reduce the Q factor requirement to levels achievable with present-day technology. Our approach leverages recent advances in nanocavities with an ultrasmall mode volume and does not require ultrafast excitation of the emitter. These results were obtained by numerical and closed-form analytical models with strong emitter dephasing, representing room-temperature quantum emitters.
We investigate theoretically the generation of indistinguishable single photons from a strongly dissipative quantum system placed inside an optical cavity. The degree of indistinguishability of photons emitted by the cavity is calculated as a function of the emitter-cavity coupling strength and the cavity linewidth. For a quantum emitter subject to strong pure dephasing, our calculations reveal that an unconventional regime of high indistinguishability can be reached for moderate emitter-cavity coupling strengths and high-quality factor cavities. In this regime, the broad spectrum of the dissipative quantum system is funneled into the narrow line shape of the cavity. The associated efficiency is found to greatly surpass spectral filtering effects. Our findings open the path towards on-chip scalable indistinguishable-photon-emitting devices operating at room temperature.
Highly efficient sources of indistinguishable single photons that can operate at room temperature would be very beneficial for many applications in quantum technology. We show that the implementation of such sources is a realistic goal using solid-state emitters and ultrasmall mode volume cavities. We derive and analyze an expression for photon indistinguishability that accounts for relevant detrimental effects, such as plasmon-induced quenching and pure dephasing. We then provide the general cavity and emitter conditions required to achieve efficient indistinguishable photon emission and also discuss constraints due to phonon sideband emission. Using these conditions, we propose that a nanodiamond negatively charged silicon-vacancy center combined with a plasmonic-Fabry-P\'erot hybrid cavity is an excellent candidate system.
The goal of this thesis is to explore and develop efficient methods for generating indistinguishable single photons. By examining quantum emitters strongly coupled to either singlemode cavities or plasmonic nanostructures, the dynamics and interactions that lead to single photon efficient generation with high degree of indistinguishability are investigated. This study begins with the theoretical background, introducing the JaynesCummings Hamiltonian and the Lindblad equation, which are essential for understanding the systemreservoir interaction in open quantum systems. Then we show how the photon indistinguishability can be achieved and quantified. Finally, using the quantum regression theorem, the correlation functions which are useful for the calculation of the indistinguishability are derived. This investigation includes both coherent and incoherent coupling regimes, revealing how different parameters, such as coupling strength and cavity decay rate, affect the efficiency and indistinguishability of the emitted photons. Numerical and detailed analytical methods are used to calculate the efficiency and the degree of indistinguishability, providing a comprehensive understanding of the factors that influence photon emission. The obtained results show that high photon indistinguishability and efficiency are achievable under specific conditions. For instance, in the case of a quantum emitter coupled to a plasmonic nanostructure, it is found that under the quasistatic approximation, the system is mathematically identical to the simpler system of a quantum emitter coupled to a leaky cavity. Using the results obtained for the quantum emitter leaky cavity case, it is shown that the more complex, quantum emitter and a plasmonic nanostructure system can produce highly indistinguishable photons with efficiency close to unity under optimal conditions. Additionally, the impact of pure dephasing on photon indistinguishability are analyzed. The findings of this thesis contribute to the advancement of quantum optics and quantum technologies, providing a foundation for developing practical quantum light sources for future technologies.
There exists a growing interest in the properties of the light generated by hybrid systems involving a mesoscopic number of emitters as a means of providing macroscopic quantum light sources. In this work, the quantum correlations of the light emitted by a collection of emitters coupled to a generic optical cavity are studied theoretically using an effective Hamiltonian approach. Starting from the single-emitter level, we analyze the persistence of photon antibunching as the ensemble size increases. Not only is the photon blockade effect identifiable, but photon antibunching originated from destructive interference processes, the so-called unconventional antibunching, is also present. We study the dependence of these two types of negative correlations on the spectral detuning between cavity and emitters, as well as its evolution as the time delay between photon detections increases. Throughout this work, the performance of plasmonic nanocavities and dielectric microcavities is compared: despite the distinct energy scales and the differences introduced by their respectively open and closed character, the bunching and antibunching phenomenology presents remarkable similarities in both types of cavities.