Funding
EMP is funded through the Horizon2020 programme of the European Commission.
Selected Publications
 

Broadband continuous variable entanglement generation using Kerr-free Josephson metamaterial

M. Perelshtein, K. Petrovnin, V. Vesterinen, S. H. Raja, I. Lilja, M. Will, A. Savin, S. Simbierowicz, R. Jabdaraghi, J. Lehtinen, L. Grönberg, J. Hassel, M. Prunnila, J. Govenius, S. Paraoanu, P. Hakonen

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 non-linear asymmetric inductive elements to generate frequency (colour) entangled photons from vacuum fluctuations at a rate of 11 mega entangled bits per second with a potential rate above gigabit per second. The device is operated as a traveling wave parametric amplifier under Kerr-relieving biasing conditions. Furthermore, we realize the first successfully demonstration of single-mode squeezing in such devices - 2.4±0.7 dB below the zero-point level at half of modulation frequency.


arXiv:2111.06145

arxiv: https://arxiv.org/abs/2111.06145