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arXiv · 2002.08715

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

Giora Peniakov·Zu-En Su·Ayal Beck·Dan Cogan·Or Amar·David Gershoni
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Abstract

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.

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Giora Peniakov, Zu-En Su, Ayal Beck, Dan Cogan, Or Amar, David Gershoni. 2020-02-20. Optical Phase Measurement Using a Deterministic Source of Entangled Multi-photon States. https://doi.org/10.1103/physrevb.101.245406

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