Nonreciprocity realized with quantum nonlinearity

Hamann, A. R., Muller, C., Jerger, M., Zanner, M., Combes, J., Pletyukhov, M., Weides, M. , M. Stace, T. and Fedorov, A. (2018) Nonreciprocity realized with quantum nonlinearity. Physical Review Letters, 121, 123601. (doi: 10.1103/PhysRevLett.121.123601)

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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Weides, Professor Martin
• Authors: Hamann, A. R., Muller, C., Jerger, M., Zanner, M., Combes, J., Pletyukhov, M., Weides, M., M. Stace, T., and Fedorov, A.
• College/School: College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
• Journal Name: Physical Review Letters
• Publisher: American Physical Society
• ISSN: 0031-9007
• ISSN (Online): 1079-7114
• Copyright Holders: Copyright © 2018 The American Physical Society
• First Published: First published in Physical Review Letters 121:123601
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher

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