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Optical Analogue of the Dynamical Casimir Effect in a Dispersion-Oscillating Fibre

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posted on 2023-11-29, 05:04 authored by Stefano Vezzoli, Arnaud Mussot, Niclas Westerberg, Alexandre Kudlinski, Hatef Dinparasti Saleh, Angus Prain, Fabio Biancalana, Eric Lantz, Daniele Faccio
The dynamical Casimir effect is the generation of pairs of real particles or photons from the vacuum as a result of a non-adiabatic change of a system parameter or boundary condition. As opposed to standard parametric amplification where the modulation occurs both in space and in time, this fundamental process requires a pure modulation in time, which makes its detection particularly challenging at optical frequencies. In this paper we experimentally demonstrate a realisation of the optical analogue of the mechanical dynamical Casimir effect in the near-infrared optical regime in a dispersion-oscillating photonic crystal fibre. The experiments are based on the equivalence of the spatial modulation of the fibre core diameter to a pure temporal modulation when this is considered in the co-moving frame of the travelling pump pulse. We provide evidence of optical dynamical Casimir effect by measuring quantum correlations between the spectrally resolved photon pairs. The non-classical nature of the measured light is supported by evidence of anti-bunching photon statistics.

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