Broadband Continuous-Variable Entanglement Generation Using a Kerr-Free Josephson Metamaterial
M.R. Perelshtein, K.V. Petrovnin, V. Vesterinen, S. Hamedani Raja, I. Lilja, M. Will, A. Savin, S. Simbierowicz, R.N. Jabdaraghi, J.S. Lehtinen, L. Grönberg, J. Hassel, M.P. Prunnila, J. Govenius, G.S. Paraoanu, P.J. Hakonen
DOI 10.1103/PhysRevApplied.18.024063 · Physical Review Applied
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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.
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