On-chip nonclassical light sources
Schematic and spectral measurements of an on-chip non-classical light source.
The goal of this project is to study and tailor nonclassical light emission from solid-state quantum systems. We couple photons, which are the quantized excitations of light, to the electronic excitations of atoms using resonators. This coupling can be enhanced up to the so-called strong-coupling regime in which photons and electronic excitations hybridize to form new states called polaritons. In the solid state, we realize this coupling on a chip using photonic-crystal nanocavities as resonators and semiconductor quantum dots – also called artificial atoms – as quantum emitters. Employing the quantum nonlinearity of this platform, we are working toward the on-demand, deterministic generation of arbitrary single- and multi-photon states in a solid-state platform. Here, these cavity quantum electrodynamical systems are promising for the light sources in future integrated quantum optical networks due to their extremely strong interaction with laser fields and fast light-matter coupling rate.
In our research, the nonclassical light is generated by filtering a stream of incident classical coherent light through a single strongly coupled nanocavity-dot system. Owing to the highly nonlinear character of the interaction between the input light and a strongly coupled system, the admission of a single photon into the cavity may enhance (photon-tunneling) or diminish (photon-blockade) the probability for a second photon to enter the cavity. Following this interaction, a light beam exits the cavity with the nonlinear action imprinted on its quantum character. Theoretical proposals suggest that the photon-tunneling effect may even allow for the emission of bundles containing an arbitrary number of photons. However, since our quantum emitters are embedded in a crystalline host matrix, they exhibit strong interactions with phonons. Although these lattice vibrations typically result in a degradation of device performance, we are investigating how their complex interaction with the strongly coupled dot-cavity system can, in fact, improve the fidelity of various forms of nonclassical light generation.
- Ultrafast Polariton-Phonon Dynamics of Strongly Coupled Quantum Dot-Nanocavity Systems, Kai Müller, Kevin A. Fischer, Armand Rundquist, Constantin Dory, Konstantinos G. Lagoudakis, Tomas Sarmiento, Yousif A. Kelaita, Victoria Borish, and Jelena Vučković, Physical Review X 5, 031006 (2015) (arXiv:1503.05595). Featured in APS Physics.
- On-Chip Generation, Routing, and Detection of Resonance Fluorescence, Günther Reithmaier, Michael Kaniber, Fabian Flassig, Stefan Lichtmannecker, Kai Müller, Alexander Andrejew, Jelena Vučković, Rudolf Gross, and Jonathan Finley, Nano Letters (2015) (arXiv:1408.2275)
- Coherent Generation of Nonclassical Light on Chip via Detuned Photon Blockade, Kai Müller, Armand Rundquist, Kevin A. Fischer, Tomas Sarmiento, Konstantinos G. Lagoudakis, Yousif A. Kelaita, Carlos Sánchez Muñoz, Elena del Valle, Fabrice P. Laussy, and Jelena Vučković, Physical Review Letters 114, 233601 (2015) (arXiv:1408.5942)
- Nonclassical higher-order photon correlations with a quantum dot strongly coupled to a photonic-crystal nanocavity, Armand Rundquist, Michal Bajcsy, Arka Majumdar, Tomas Sarmiento, Kevin Fischer, Konstantinos G. Lagoudakis, Sonia Buckley, Alexander Y. Piggott, and Jelena Vuckovic Physical Review A 90, 023846 (2014)