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

    21 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

    Fingerprint

    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.
    @article{013c65bf40ae4754873d06e2e5da310a,
    title = "Coherence and multimode correlations from vacuum fluctuations in a microwave superconducting cavity",
    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.",
    keywords = "Applied physics, Quantum mechanics, Single photons and quantum effects",
    author = "Pasi L{\"a}hteenm{\"a}ki and Paraoanu, {Gheorghe Sorin} and Juha Hassel and Hakonen, {Pertti J.}",
    note = "Project code: 101521",
    year = "2016",
    doi = "10.1038/ncomms12548",
    language = "English",
    volume = "7",
    journal = "Nature Communications",
    issn = "2041-1723",
    publisher = "Nature Publishing Group",

    }

    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

    N2 - 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.

    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

    U2 - 10.1038/ncomms12548

    DO - 10.1038/ncomms12548

    M3 - Article

    VL - 7

    JO - Nature Communications

    JF - Nature Communications

    SN - 2041-1723

    M1 - 12548

    ER -