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Q: Fachverband Quantenoptik und Photonik

Q 53: Quantum Optics and Photonics III

Q 53.7: Talk

Thursday, March 14, 2019, 15:30–15:45, S Gr. HS Maschb.

Spectra of ultrabroadband squeezed pulses and the finite-time Unruh-Davies effect — •Thiago Lucena de M. Guedes, Matthias Kizmann, Guido Burkard, and Andrey S. Moskalenko — University of Konstanz, Konstanz, Germany

We study the spectral properties of quantum radiation of ultrashort duration. In particular, we introduce a continuous multimode squeezing operator for the description of subcycle pulses of entangled photons generated by a coherent-field driving in a thin nonlinear crystal with second order susceptibility. We find the ultrabroadband spectra of the emitted quantum radiation perturbatively in the strength of the driving field [1]. These spectra can be related to the spectra expected in an Unruh-Davies experiment with a finite time of acceleration [2]. We discuss the possibility of transition between finite-time and usual Unruh-Davies effects by increasing the intensity of the driving field. In the time domain, we describe the corresponding behavior of the normally ordered electric field variance, which can be compared to the recent results obtained in quantum electro-optic experiments [3].

[1] T. L. M. Guedes et al., arXiv:1810.08273v1.

[2] P. Martinetti and C. Rovelli, Class. and Quantum Gravity 20, 4919 (2003).

[3] C. Riek et al., Nature 541, 376 (2017).