Titel
Hong-Ou-Mandel interferometry on a biphoton beat note
Autor*in
Fabian Steinlechner
Fraunhofer Institute for Applied Optics and Precision Engineering IOF
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Abstract
Hong-Ou-Mandel interference, the fact that identical photons that arrive simultaneously on different input ports of a beam splitter bunch into a common output port, can be used to measure optical delays between different paths. It is generally assumed that great precision in the measurement requires that photons contain many frequencies, i.e., a large bandwidth. Here we challenge this “well-known” assumption and show that the use of two well-separated frequencies embedded in a quantum entangled state (discrete color entanglement) suffices to achieve great precision. We determine optimum working points using a Fisher Information analysis and demonstrate the experimental feasibility of this approach by detecting thermally-induced delays in an optical fiber. These results may significantly facilitate the use of quantum interference for quantum sensing, by avoiding some stringent conditions such as the requirement for large bandwidth signals.
Stichwort
Quantum metrologyQuantum optics
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
Erschienen in
Titel
npj Quantum Information
Band
5
ISSN
2056-6387
Erscheinungsdatum
2019
Publication
Springer Science and Business Media LLC
Erscheinungsdatum
2019
Zugänglichkeit
Rechte
Rechteangabe
© The Author(s) 2019
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