We demonstrate the successful realization of unconditional quantum teleportation in the microwave regime over the distance of 42 cm by exploiting two-mode squeezing and analog feedforward. We generate squeezed and feedforward signals in the GHz regime by using superconducting Josephson parametric amplifiers. We realize quantum teleportation of coherent states with fidelities exceeding the no-cloning limit, thus, proving the unconditional security of the protocol. Furthermore, our experiments reveal the influence of the feedforward gain and entanglement strength on the teleportation fidelity in the presence of finite noise and losses. In the end, we demonstrate that quantum microwave communication is feasible over macroscopic distances in the cryogenic environment. Our results enable future implementations of microwave quantum local area networks and distributed quantum computing with superconducting circuits.
*We acknowledge support by the German Research Foundation through the Munich Center for Quantum Science and Technology (MCQST), Elite Network of Bavaria through the program ExQM, EU Flagship project QMiCS (Grant No. 820505).
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Presenters
Kirill Fedorov
Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities
Walther-Meißner-Institute, Bavarian Academy of Sciences and Humanities & Physik-Department, Technische Universität München, Germany
Authors
Kirill Fedorov
Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities
Walther-Meißner-Institute, Bavarian Academy of Sciences and Humanities & Physik-Department, Technische Universität München, Germany
Stefan Pogorzalek
Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities
Walther-Meißner-Institute, Bavarian Academy of Sciences and Humanities & Physik-Department, Technische Universität München, Germany
Michael Renger
Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities
Walther-Meißner-Institute, Bavarian Academy of Sciences and Humanities & Physik-Department, Technische Universität München, Germany
Qiming Chen
Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities
Walther-Meißner-Institute, Bavarian Academy of Sciences and Humanities & Physik-Department, Technische Universität München, Germany
Yuki Nojiri
Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities
Matti Partanen
QCD Labs, Aalto University
Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities
Walther-Meißner-Institut, Technische Universität München
Walther-Meißner-Institute, Bavarian Academy of Sciences and Humanities & Physik-Department, Technische Universität München, Germany
QCD Labs, Department of Applied Physics, Aalto University
Achim Marx
Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities
Walther-Meißner-Institute, Bavarian Academy of Sciences and Humanities & Physik-Department, Technische Universität München, Germany
Rudolf Gross
Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities
Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany
Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities, Garching, Germany
Walther Meißner Institut
Walther-Meißner-Institute, Bavarian Academy of Sciences and Humanities & Physik-Department, Technische Universität München, Germany
Frank Deppe
Walther-Meißner-Institut, Bavarian Academy of Sciences and Humanities
Walther-Meißner-Institute, Bavarian Academy of Sciences and Humanities & Physik-Department, Technische Universität München, Germany
