Observing the transition from quantum to classical energy correlations with photon pairs

Lerch, Stefan; Stefanov, André (2018). Observing the transition from quantum to classical energy correlations with photon pairs. Communications Physics, 1(1) Springer Nature 10.1038/s42005-018-0027-2

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The exact role of entanglement in various quantum metrology schemes is still subject to debates. This is why it would be interesting to be able to experimentally control the relative amount of quantum and classical correlations. Here, we demonstrate a method to tune energy correlations between two photons from a pair emitted by spontaneous parametric downconversion. Decoherence in the energy basis is achieved by applying random spectral phases on the photons. As a consequence, a diverging temporal second-order correlation function is observed and is explained by a mixture between an energy entangled pure state and a fully classically correlated mixed state. Such source of tunable energy entangled photon pairs could be used to demonstrate quantum advantages in future energy-time sensing schemes.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics

UniBE Contributor:

Lerch, Stefan and Stefanov, André

Subjects:

600 Technology > 620 Engineering

ISSN:

2399-3650

Publisher:

Springer Nature

Language:

English

Submitter:

Franziska Stämpfli

Date Deposited:

07 Dec 2018 14:08

Last Modified:

24 Oct 2019 05:55

Publisher DOI:

10.1038/s42005-018-0027-2

BORIS DOI:

10.7892/boris.121705

URI:

https://boris.unibe.ch/id/eprint/121705

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