Nonreciprocity realized with quantum nonlinearity
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.
Cite
@article{arxiv.1806.00182,
title = {Nonreciprocity realized with quantum nonlinearity},
author = {Andrés Rosario Hamann and Clemens Müller and Markus Jerger and Maximilian Zanner and Joshua Combes and Mikhail Pletyukhov and Martin Weides and Thomas M. Stace and Arkady Fedorov},
journal= {arXiv preprint arXiv:1806.00182},
year = {2018}
}
Comments
8 pages, 6 figures