Resonance fluorescence of a chiral artificial atom

• URL: http://arxiv.org/abs/2212.11400v1
• Date: Wed, 21 Dec 2022 22:59:43 GMT
• Title: Resonance fluorescence of a chiral artificial atom
• Authors: Chaitali Joshi, Frank Yang, and Mohammad Mirhosseini
• Abstract summary: We demonstrate a superconducting artificial atom with strong unidirectional coupling to a microwave photonic waveguide. Our demonstration puts forth a superconducting hardware platform for the realization of several key functionalities pursued within the paradigm of chiral quantum optics.
• Score: 0.28675177318965034
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We demonstrate a superconducting artificial atom with strong unidirectional coupling to a microwave photonic waveguide. Our artificial atom is realized by coupling a transmon qubit to the waveguide at two spatially separated points with time-modulated interactions. Direction-sensitive interference arising from the parametric couplings in our scheme results in a non-reciprocal response, where we measure a forward/backward ratio of spontaneous emission exceeding 100. We verify the quantum nonlinear behavior of this artificial chiral atom by measuring the resonance fluorescence spectrum under a strong resonant drive and observing well-resolved Mollow triplets. Further, we demonstrate chirality for the second transition energy of the artificial atom and control it with a pulse sequence to realize a qubit-state-dependent non-reciprocal phase on itinerant photons. Our demonstration puts forth a superconducting hardware platform for the scalable realization of several key functionalities pursued within the paradigm of chiral quantum optics, including quantum networks with all-to-all connectivity, driven-dissipative stabilization of many-body entanglement, and the generation of complex non-classical states of light.

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