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Dynamical Casimir effect in a Josephson metamaterial | | Pasi Lähteenmäki
; G. S. Paraoanu
; Juha Hassel
; Pertti J. Hakonen
; | | Date: |
23 Nov 2011 | | Abstract: | Vacuum modes confined into an electromagnetic cavity give rise to an
attractive interaction between the opposite walls. When the distance between
the walls is changed non-adiabatically, virtual vacuum modes are turned into
real quantum particles, i.e. photons are generated out of the vacuum. These
effects are known as the static and dynamical Casimir effect, respectively.
Here we demonstrate the dynamical Casimir effect using a Josephson metamaterial
embedded into a microwave cavity at 5.4 GHz. We achieve the non-adiabatic
change in the effective length of the cavity by flux-modulation of the
SQUID-based metamaterial, which results in a few percent variation in the
velocity of light in this material. We show that energy-correlated (two-mode
squeezed) photons are generated from the ground state of the cavity and that
their power spectra display a bimodal frequency distribution. These results are
in excellent agreement with theoretical predictions, all the way to the regime
where classical parametric effects cannot be of consequence. | | Source: | arXiv, 1111.5608 | | Services: | Forum | Review | PDF | Favorites | |
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