Photon generation from quantum vacuum using a josephson metamaterial

P. Lähteenmäki, G.S. Paraoanu, Juha Hassel, P. Hakonen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

1 Citation (Scopus)

Abstract

When one of the parameters in the Euler-Lagrange equations of motion of a sys- tem is modulated, particles can be generated out of the quantum vacuum. This phenomenon is known as the dynamical Casimir effect, and it was recently realized experimentally in systems of superconducting circuits, for example by using modulated resonators made of coplanar waveg- uides, or arrays of superconducting quantum intereference devices (SQUIDs) forming a Josephson metamaterial. In this paper, we consider a simple electrical circuit model for dynamical Casimir effects, consisting of an LC resonator, with the inductor modulated externally at 10.8 GHz and with the resonant frequency tunable over a range of ±400MHz around 5.4 GHz. The circuit is analyzed classically using a circuit simulator (APLAC). We demonstrate that if an additional source of classical noise couples to the resonator (on top of the quantum vacuum), for example via dissipative "internal modes", then the resulting spectrum of the photons in the cavity will present two strongly asymmetric branches. However, according to the theory of the dynamical Casimir effect, these branches should be symmetric, a prediction which is confirmed by our ex- perimental data. The simulation presented here therefore shows that the origin of the photons generated in our experiment with Josephson metamaterials is the quantum vacuum, and not a spurious classical noise source.
Original languageEnglish
Title of host publicationProceedings
Subtitle of host publicationProgress in Electromagnetics Research Symposium, PIERS 2013
PublisherElectromagnetics Academy
Pages151-153
ISBN (Print)978-193414224-0
Publication statusPublished - 2013
MoE publication typeNot Eligible
Event33rd Progress in Electromagnetics Research Symposium, PIERS 2013 - Taipei, Taiwan, Province of China
Duration: 25 Mar 201328 Mar 2013
Conference number: 33

Conference

Conference33rd Progress in Electromagnetics Research Symposium, PIERS 2013
Abbreviated titlePIERS 2013
CountryTaiwan, Province of China
CityTaipei
Period25/03/1328/03/13

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Euler-Lagrange equation
vacuum
resonators
photons
Euler equations of motion
inductors
simulators
resonant frequencies
waveguides
cavities
predictions
simulation

Cite this

Lähteenmäki, P., Paraoanu, G. S., Hassel, J., & Hakonen, P. (2013). Photon generation from quantum vacuum using a josephson metamaterial. In Proceedings: Progress in Electromagnetics Research Symposium, PIERS 2013 (pp. 151-153). Electromagnetics Academy.
Lähteenmäki, P. ; Paraoanu, G.S. ; Hassel, Juha ; Hakonen, P. / Photon generation from quantum vacuum using a josephson metamaterial. Proceedings: Progress in Electromagnetics Research Symposium, PIERS 2013. Electromagnetics Academy, 2013. pp. 151-153
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Lähteenmäki, P, Paraoanu, GS, Hassel, J & Hakonen, P 2013, Photon generation from quantum vacuum using a josephson metamaterial. in Proceedings: Progress in Electromagnetics Research Symposium, PIERS 2013. Electromagnetics Academy, pp. 151-153, 33rd Progress in Electromagnetics Research Symposium, PIERS 2013, Taipei, Taiwan, Province of China, 25/03/13.

Photon generation from quantum vacuum using a josephson metamaterial. / Lähteenmäki, P.; Paraoanu, G.S.; Hassel, Juha; Hakonen, P.

Proceedings: Progress in Electromagnetics Research Symposium, PIERS 2013. Electromagnetics Academy, 2013. p. 151-153.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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AB - When one of the parameters in the Euler-Lagrange equations of motion of a sys- tem is modulated, particles can be generated out of the quantum vacuum. This phenomenon is known as the dynamical Casimir effect, and it was recently realized experimentally in systems of superconducting circuits, for example by using modulated resonators made of coplanar waveg- uides, or arrays of superconducting quantum intereference devices (SQUIDs) forming a Josephson metamaterial. In this paper, we consider a simple electrical circuit model for dynamical Casimir effects, consisting of an LC resonator, with the inductor modulated externally at 10.8 GHz and with the resonant frequency tunable over a range of ±400MHz around 5.4 GHz. The circuit is analyzed classically using a circuit simulator (APLAC). We demonstrate that if an additional source of classical noise couples to the resonator (on top of the quantum vacuum), for example via dissipative "internal modes", then the resulting spectrum of the photons in the cavity will present two strongly asymmetric branches. However, according to the theory of the dynamical Casimir effect, these branches should be symmetric, a prediction which is confirmed by our ex- perimental data. The simulation presented here therefore shows that the origin of the photons generated in our experiment with Josephson metamaterials is the quantum vacuum, and not a spurious classical noise source.

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Lähteenmäki P, Paraoanu GS, Hassel J, Hakonen P. Photon generation from quantum vacuum using a josephson metamaterial. In Proceedings: Progress in Electromagnetics Research Symposium, PIERS 2013. Electromagnetics Academy. 2013. p. 151-153