Nonreciprocity Realized with Quantum Nonlinearity

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 wavegui...

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Bibliographic Details
Published in:Physical review letters 2018-09, Vol.121 (12), p.123601-123601, Article 123601
Main Authors: Rosario Hamann, Andrés, Müller, Clemens, Jerger, Markus, Zanner, Maximilian, Combes, Joshua, Pletyukhov, Mikhail, Weides, Martin, Stace, Thomas M, Fedorov, Arkady
Format: Article
Language:English
Subjects:
Nonlinearity
Quantum dots
Quantum theory
Qubits (quantum computing)
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.121.123601