Nonreciprocity Realized with Quantum Nonlinearity

Andrés Rosario Hamann, Clemens Müller, Markus Jerger, Maximilian Zanner, Joshua Combes, Mikhail Pletyukhov, Martin Weides, Thomas M. Stace, and Arkady Fedorov
Phys. Rev. Lett. 121, 123601 – Published 17 September 2018
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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 quasidark 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.

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  • Received 8 July 2018

DOI:https://doi.org/10.1103/PhysRevLett.121.123601

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Andrés Rosario Hamann1,*, Clemens Müller1,2, Markus Jerger1, Maximilian Zanner3, Joshua Combes1, Mikhail Pletyukhov4, Martin Weides3,5, Thomas M. Stace1, and Arkady Fedorov1,†

  • 1ARC Centre of Excellence for Engineered Quantum Systems, School of Mathematics and Physics, The University of Queensland, Saint Lucia, Queensland 4072, Australia
  • 2Institute for Theoretical Physics, ETH Zürich, 8093 Zürich, Switzerland
  • 3Physikalisches Institut, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
  • 4Institute for Theory of Statistical Physics, RWTH Aachen University, 52056 Aachen, Germany
  • 5School of Engineering, Electronics & Nanoscale Engineering Division, University of Glasgow, Glasgow G12 8QQ, United Kingdom

  • *arosario@uq.edu.au
  • a.fedorov@uq.edu.au

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Issue

Vol. 121, Iss. 12 — 21 September 2018

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