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Nonreciprocity realized with quantum nonlinearity

By Andrés Rosario Hamann, Clemens Müller, Markus Jerger, Maximilian Zanner, Joshua Combes, Mikhail Pletyukhov, Martin Weides, Thomas M. Stace and Arkady Fedorov

Abstract

Nonreciprocal devices are a key element for signal routing and noise isolation. Rapid development of quantum technologies has boosted the demand for a new generation of miniaturized and low-loss nonreciprocal components. Here we use a pair of tunable superconducting artificial atoms in a 1D waveguide to experimentally realize a minimal passive nonreciprocal device. Taking advantage of the quantum nonlinear behavior of artificial atoms, we achieve nonreciprocal transmission through the waveguide in a wide range of powers. Our results are consistent with theoretical modeling showing that nonreciprocity is associated with the population of the two-qubit nonlocal entangled quasi-dark state, which responds asymmetrically to incident fields from opposing directions. Our experiment highlights the role of quantum correlations in enabling nonreciprocal behavior and opens a path to building passive quantum nonreciprocal devices without magnetic fields.Comment: 8 pages, 6 figure

Topics: Quantum Physics
Publisher: 'American Physical Society (APS)'
Year: 2018
DOI identifier: 10.1103/PhysRevLett.121.123601
OAI identifier: oai:arXiv.org:1806.00182

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