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Spectrally-resolved white-light quantum interferometry for high-accuracy optical measurements.

Spectrally-resolved white-light quantum interferometry for high-accuracy optical measurements.

Datum: 18. Oktober 2016 13:00

Ort: NWZII, 6.331

Quantum optical metrology exploits superpositions of N-photon number states, referred to as N00N-states, for phase sensing with N times improved sensitivity compared to classical approaches involving N photons.
However, quantum metrology has not yet paved its way out of the lab due to the intrinsically lower brightness of quantum light sources compared to their classical counterparts.

In this seminar, I will introduce the new concept of spectrally-resolved quantum interferometry based on energy-time entangled two-photon N00N-states.
The peculiar use of entanglement offers advantages far beyond improving phase sensitivity, and I will show how we exploit these features for high-accuracy chromatic dispersion measurements in short optical components and fibres.

By comparing state-of-the-art standard classical measurements to our new approach, we show a 2.6 times higher accuracy for the quantum-enhanced strategy, despite involving 60 times less photons for the measurement.
This underlines that the improved accuracy is essentially due to conceptual advantages enabled by quantum optics which are likely to define new standards in a variety of applied research fields.
 
 
 

 

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