Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity

Pasi Lähteenmäki (Corresponding Author), Gheorghe Sorin Paraoanu, Juha Hassel, Pertti J. Hakonen (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)

Abstract

The existence of vacuum fluctuations is one of the most important predictions of modern quantum field theory. In the vacuum state, fluctuations occurring at different frequencies are uncorrelated. However, if a parameter in the Lagrangian of the field is modulated by an external pump, vacuum fluctuations stimulate spontaneous downconversion processes, creating squeezing between modes symmetric with respect to half of the frequency of the pump. Here we show that by double parametric pumping of a superconducting microwave cavity, it is possible to generate another type of correlation, namely coherence between photons in separate frequency modes. The coherence correlations are tunable by the phases of the pumps and are established by a quantum fluctuation that stimulates the simultaneous creation of two photon pairs. Our analysis indicates that the origin of this vacuum-induced coherence is the absence of which-way information in the frequency space.
Original languageEnglish
Article number12548
Number of pages7
JournalNature Communications
Volume7
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

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Vacuum
Microwaves
microwaves
vacuum
cavities
Photons
Pumps
Vacuum pumps
Quantum Theory
pumps
Laser modes
vacuum pumps
photons
compressing
pumping
predictions

Keywords

  • Applied physics
  • Quantum mechanics
  • Single photons and quantum effects

Cite this

Lähteenmäki, Pasi ; Paraoanu, Gheorghe Sorin ; Hassel, Juha ; Hakonen, Pertti J. / Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity. In: Nature Communications. 2016 ; Vol. 7.
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Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity. / Lähteenmäki, Pasi (Corresponding Author); Paraoanu, Gheorghe Sorin; Hassel, Juha; Hakonen, Pertti J. (Corresponding Author).

In: Nature Communications, Vol. 7, 12548, 2016.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity

AU - Lähteenmäki, Pasi

AU - Paraoanu, Gheorghe Sorin

AU - Hassel, Juha

AU - Hakonen, Pertti J.

N1 - Project code: 101521

PY - 2016

Y1 - 2016

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AB - The existence of vacuum fluctuations is one of the most important predictions of modern quantum field theory. In the vacuum state, fluctuations occurring at different frequencies are uncorrelated. However, if a parameter in the Lagrangian of the field is modulated by an external pump, vacuum fluctuations stimulate spontaneous downconversion processes, creating squeezing between modes symmetric with respect to half of the frequency of the pump. Here we show that by double parametric pumping of a superconducting microwave cavity, it is possible to generate another type of correlation, namely coherence between photons in separate frequency modes. The coherence correlations are tunable by the phases of the pumps and are established by a quantum fluctuation that stimulates the simultaneous creation of two photon pairs. Our analysis indicates that the origin of this vacuum-induced coherence is the absence of which-way information in the frequency space.

KW - Applied physics

KW - Quantum mechanics

KW - Single photons and quantum effects

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JO - Nature Communications

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