Year: 2026
Type: article
Abstract: Interferometry is a powerful method for studying many fundamental phenomena ranging from gravitational waves to anyon excitations. Besides loss of coherence in the interferometer paths, quantum mechanics sets an incompressible bound for linear interferometry arising from the quantum noise of the light beam, called the shot noise limit. Here, we implement a non-linear quantum interferometer that uses a microwave cavity and a magnetic field resilient anharmonic superconducting quantum circuit made of granular aluminum. The circuit enables interferometry beyond the shot noise limit. A direct application of our findings is the detection of dark matter (axions or dark photons), high-frequency gravitational waves or astronomical masers.
Source: Physical Review A
DOI: 10.1103/f252-64sy
Institutions: Centre National de la Recherche Scientifique, Université Paris Sciences et Lettres, École Normale Supérieure - PSL, Sorbonne Université, Laboratoire de Physique et d’Étude des Matériaux, Laboratoire de Physique de l'Ecole Normale Supérieure, ESPCI Paris, Institut polytechnique de Grenoble, Institut Néel, Université Grenoble Alpes, Institut Universitaire de France, FORTH Institute of Astrophysics
Language: English
Subfield: Artificial Intelligence
Field: Computer Science
Domain: Physical Sciences
Open Access status: green
Funders: QuantERA, European Research Council
Award: G2566466861
OpenAlex ID: W7118175502