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Related Experiment Video

Updated: May 23, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

Single-photon spectroscopy of a single molecule.

Y L A Rezus¹, S G Walt, R Lettow

¹Laboratory of Physical Chemistry, ETH Zurich, 8093 Zurich, Switzerland.

Physical Review Letters

|April 3, 2012

Summary

Researchers demonstrate a new method for generating single photons from one emitter to perform spectroscopy on another. This breakthrough advances quantum engineering by enabling efficient light-matter interactions with single photons and emitters.

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Area of Science:

Quantum physics
Quantum optics
Quantum engineering

Background:

Efficient light-matter interaction at the single-photon and single-emitter level is crucial for quantum technologies.
Generating tailored single-photon streams and achieving strong single-photon-emitter coupling remain significant challenges.

Purpose of the Study:

To develop a general approach for creating single photons from a single emitter.
To utilize these single photons for performing spectroscopy on a separate emitter.

Main Methods:

Demonstration of a novel scheme for single-photon generation from a single emitter.
Application of generated single photons to conduct spectroscopy on a second, spatially separated emitter.
Utilizing organic molecules as emitters in the proof-of-principle experiment.

Main Results:

Successful generation of single photons from a single emitter.
Demonstration of spectroscopy on a second emitter using the generated single photons.
Proof of principle achieved using organic molecules, with potential extension to quantum dots and color centers.

Conclusions:

The developed approach provides a general method for single-photon generation and spectroscopy.
This work opens new avenues for studying coherent and nonlinear couplings between few emitters and few photons.
The scheme is adaptable for various quantum emitters, paving the way for advanced quantum engineering applications.