Broadband Continuous-Variable Entanglement Generation Using a Kerr-Free Josephson Metamaterial
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2022-08
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en
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14
1-14
1-14
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Physical Review Applied, Volume 18, issue 2
Abstract
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.Description
| openaire: EC/H2020/862644/EU//QUARTET | openaire: EC/H2020/820505/EU//QMiCS | openaire: EC/H2020/820363/EU//OpenSuperQ | openaire: EC/H2020/824109/EU//EMP | openaire: EC/H2020/670743/EU//QuDeT Funding Information: We thank Alpo Ahonen, Paula Holmlund, and Harri Pohjonen for technical assistance and Terra Quantum AG for scientific support. K.V.P. is funded by the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 862644 (FET-Open project: Quantum readout techniques and technologies, QUARTET). The work at VTT is funded from the EU Flagship on Quantum Technology Grant No. H2020-FETFLAG-2018-03 Project Nos. 820363 OpenSuperQ and 820505 QMiCS. The contribution of M.R.P., I.L., M.W., and A.S. is supported by Grant Agreement No. 824109 (European Microkelvin Platform project, EMP), and ERC Grant Agreement No. 670743 (QuDeT). P.J.H. and V.V. acknowledge financial support from the Academy of Finland through Grants No. 314448 and No. 321700, respectively. The work of S.H.R. and P.J.H. is supported by a MATINE research grant. G.S.P. and K.V.P. thank Saab for scientific collaboration under a research agreement with Aalto University. This work is done under the “Finnish Center of Excellence in Quantum Technology QTF” of the Academy of Finland, Projects No. 312059, No. 312294, No. 312295, No. 336810, and No. 312296. Publisher Copyright: © 2022 American Physical Society.
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Perelshtein , M R , Petrovnin , K V , Vesterinen , V , Hamedani Raja , S , Lilja , I , Will , M , Savin , A , Simbierowicz , S , Jabdaraghi , R N , Lehtinen , J S , Grönberg , L , Hassel , J , Prunnila , M P , Govenius , J , Paraoanu , G S & Hakonen , P J 2022 , ' Broadband Continuous-Variable Entanglement Generation Using a Kerr-Free Josephson Metamaterial ' , Physical Review Applied , vol. 18 , no. 2 , 024063 , pp. 1-14 . https://doi.org/10.1103/PhysRevApplied.18.024063