Our ability to produce and manipulate non-classical states of light at different wavelengths, from microwave to terahertz to visible and ultraviolet, constitutes the fundamental building blocks of a new technological revolution that has already started. Indeed, during the past two decades, quantum devices have become the engine of technological innovations in many different fields of science and engineering. Along these lines, recent years have witnessed a considerable burst of experimental and theoretical work highlighting the potential of quantum light for offering unprecedented levels of sensitivity and resolution in imaging, spectroscopy and sensing applications. In this Research Topic, we aim at highlighting state-of-the-art research in quantum imaging, sensing and spectroscopy, including the efforts being done in the generation and manipulation of quantum states of light, such as single-photon sources, entangled photon pairs, squeezed light, and their real-world applications.

The study of quantum light for imaging, sensing and spectroscopy is a timely and exciting research field at the forefront of physics and technology. It has the potential to impact many areas of science and engineering, especially when high resolution imaging and parameter estimation with low photon flux is mandatory to avoid damage to the sample. Given the increasing number of scientists devoting efforts to implementing quantum-technologies, we believe that frontiers in physics is the ideal platform through which all these people can connect and exchange new ideas. Through this Research Topic, we intend to advance our understanding of quantum light, aiming at the development of novel applications and technologies of potentially high impact.

Research articles, review articles as well as brief research reports are invited. Topics covered include, but are not limited to:

- Quantum light for imaging applications (including advances in microwave and terahertz imaging, ghost imaging, microscopy, nonlinear interferometers, and optical coherence tomography)
- Quantum sensing for out-of-the-lab applications
- Quantum-enhanced spectroscopy
- Quantum enabling technologies (light sources, detectors)
- Quantum nanophotonics and plasmonics for sensing and spectroscopy
- Quantum theory of quantum light-matter interactions

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