Erlangen 2018 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 12: Quantum Optics II

Q 12.8: Vortrag

Montag, 5. März 2018, 15:45–16:00, K 0.016

Spectral properties of ultrabroadband squeezed pulses of quantum light — •Thiago Lucena de M. Guedes, Matthias Kizmann, Guido Burkard, and Andrey S. Moskalenko — University of Konstanz, Konstanz, Germany

In recent years, a series of works [1,2,3] provided a deeper understanding on how to sample and squeeze the vacuum fluctuations of the electric field at a femtosecond time scale. Following the respective works, the squeezing operator for an ultrabroadband (continuous) multimode squeezed vacuum state generated in a thin nonlinear crystal was derived. The squeezing is found to depend on the shape and duration of the pump pulse that enters one of the ports of the generating crystal. The photon number density distribution in frequency for such squeezed states can be calculated perturbatively and shows to a good accuracy an exponential decaying behavior for most of the pump field shapes. We compare the corresponding spectra with the spectrum of the Unruh-Davies radiation [4,5], which would be seen by a detector at rest in a highly-accelerated non-inertial reference frame. We analyze the temporal behavior of the normal-ordered variance of the electric-field operator. On the subcyle time scale there are pronounced differences to the conventional harmonic dependence of the variance of a single-mode squeezed state on the phase delay.

[1] C. Riek et al., Science 350, 420 (2015). [2] A.S. Moskalenko et al., Phys. Rev. Lett. 115, 263601 (2015). [3] C. Riek et al., Nature 541, 376 (2017). [4] W. G. Unruh, Phys. Rev. D 14, 870 (1976). [5] P. C. W. Davies, J. Phys. A 8, 609 (1975).