Optical Phase Measurement Using a Deterministic Source of Entangled Multi-photon States

Precision measurements of optical phases have many applications in science and technology. Entangled multi-photon states have been suggested for performing such measurements with precision that significantly surpasses the shot-noise limit. Until recently, such states have been generated mainly using...

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Bibliographic Details
Published inarXiv.org
Main Authors Peniakov, Giora, Zu-En Su, Beck, Ayal, Cogan, Dan, Or Amar, Gershoni, David
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 20.02.2020
Subjects
Electrons
Phase measurement
Photons
Physics - Mesoscale and Nanoscale Physics
Physics - Quantum Physics
Quantum dots
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Summary:Precision measurements of optical phases have many applications in science and technology. Entangled multi-photon states have been suggested for performing such measurements with precision that significantly surpasses the shot-noise limit. Until recently, such states have been generated mainly using spontaneous parametric down-conversion -- a process which is intrinsically probabilistic, counteracting the advantages that the entangled photon states might have. Here, we use a semiconductor quantum dot to generate entangled multi-photon states in a deterministic manner, using periodic timed excitation of a confined spin. This way we entangle photons one-by-one at a rate which exceeds 300 MHz. We use the resulting multi-photon state to demonstrate super-resolved optical phase measurement. Our results open up a scalable way for realizing genuine quantum enhanced super-sensitive measurements in the near future.
ISSN:2331-8422
DOI:10.48550/arxiv.2002.08715