νNANOPHOTONICSQUANTUM LIGHT & NANOSTRUCTURES
Nanoscale optics · Quantum emitters · Integrated photonics

Quantum light.
Nanoscale control.

How do engineered optical modes turn vacuum fluctuations, spontaneous emission, single photons and quantum interference into experimentally accessible technologies?

Start the guided journey ↗Explore all 42 concepts ↗
$$H/\hbar=\omega_c a^\dagger a+\frac{\omega_e}{2}\sigma_z+g(a^\dagger\sigma_-+a\sigma_+)$$

Confinement → quantum light–matter coupling → measurable photon statistics → devices

The essential distinction

Nanophotonic confinement is not itself a quantum effect.

Quantum nanophotonics studies the interaction of quantum states of light and matter with optical structures whose features can be comparable to, or smaller than, the wavelength. The geometry reshapes electromagnetic modes and vacuum fluctuations; quantization, interference, correlations and entanglement determine genuinely quantum observables.

Classical Maxwell equations explain many nanophotonic resonances. Quantum mechanics becomes essential for single-photon states, antibunching, vacuum fluctuations, emitter saturation, entanglement and measurement backaction. This library explains both levels without conflating them.

Six chapters · 42 detailed concepts

Enter the subject.

Chapter 01 · 8 conceptsLight confined below the wavelengthModes, Maxwell equations, evanescent waves and optical confinement.Chapter 02 · 10 conceptsQuantum Light and EmittersQuantization of electromagnetic fields, photons and emitter–cavity coupling.Chapter 03 · 6 conceptsNanophotonic PlatformsPlasmonics, dielectric resonators, metasurfaces, waveguides and integrated devices.Chapter 04 · 8 conceptsLight–Matter Quantum PhenomenaPurcell enhancement, strong coupling, collective emission and nonlinear quantum optics.Chapter 05 · 6 conceptsQuantum Information with PhotonsSingle photons, entanglement, interference, detection and photonic computing.Chapter 06 · 4 conceptsFrontiers, Experiments and DesignTopological photonics, quantum sensing, fabrication, simulation and realistic limitations.
From theory to experiment

Follow the physical chain.

01 / ElectromagnetismDesign the modesBoundary conditions, dispersion, confinement and loss.
02 / Quantum opticsQuantize and couplePhotons, emitters, open-system dynamics and correlations.
03 / ExperimentMeasure the evidenceAntibunching, interference, spectra, uncertainty and controls.
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