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arXiv:2201.11261 · Nature Physics

Broadband squeezed microwaves and amplification with a Josephson travelling-wave parametric amplifier

Jack Y. Qiu, Arne L. Grimsmo, Kaidong Peng, Bharath Kannan, Benjamin Lienhard, Youngkyu Sung, Philip Krantz, Vladimir Bolkhovsky, Greg Calusine, David K. Kim, Alexander J. Melville, Bethany M. Niedzielski, Jonilyn Yoder, Mollie E. Schwartz, Terry P. Orlando, Irfan A. Siddiqi, Simon Gustavsson, Kevin P. O’Brien, William D. Oliver

Published Feb 9, 2023• 80 citations
arXivHTMLPDF
DOI
10.1038/s41567-022-01929-w

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Traveling wave parametric amplifiers (TWPAs) have recently emerged as essential tools for broadband near quantum-limited amplification. However, their use to generate microwave quantum states still misses an experimental demonstration. In this Letter, we report operation of a TWPA as a source of two-mode squeezed microwave radiation. We demonstrate broadband entanglement generation between two modes separated by up to 400 MHz by measuring logarithmic negativity between 0.27 and 0.51 and collective quadrature squeezing below the vacuum limit between 1.5 and 2.1 dB. This work opens interesting perspectives for the exploration of novel microwave photonics experiments with possible applications in quantum sensing and continuous variable quantum computing.