Broadband Continuous-Variable Entanglement Generation Using a Kerr-Free Josephson Metamaterial

M. R. Perelshtein, K. V. Petrovnin, Visa Vesterinen, S. Hamedani Raja, I. Lilja, M. Will, A. Savin, Slawomir Simbierowicz, Robab Najafi Jabdaraghi, Janne S. Lehtinen, Leif Grönberg, Juha Hassel, Mika P. Prunnila, Joonas Govenius, G. S. Paraoanu, P. J. Hakonen (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

14 Citations (Scopus)


Entangled microwave photons form a fundamental resource for quantum information processing and sensing with continuous variables. We use a low-loss Josephson metamaterial comprising superconducting, nonlinear, asymmetric inductive elements to generate frequency-entangled photons from vacuum fluctuations at a rate of 2 giga entangled bits per second spanning over the 4-GHz bandwidth. The device is operated as a traveling-wave parametric amplifier under Kerr-relieving biasing conditions. Furthermore, we demonstrate single-mode squeezing in such devices - 3.1±0.7dB below the zero-point level at half of modulation frequency.
Original languageEnglish
Article number024063
JournalPhysical Review Applied
Issue number2
Publication statusPublished - Aug 2022
MoE publication typeA1 Journal article-refereed


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