Microwave Down-Conversion with an Impedance-Matched $\Lambda$ System in Driven Circuit QED

Abstract

By driving a dispersively coupled qubit-resonator system, we realize an "impedance-matched" $\Lambda$ system that has two identical radiative decay rates from the top level and interacts with a semi-infinite waveguide. It has been predicted that a photon input from the waveguide deterministically induces a Raman transition in the system and switches its electronic state. We confirm this through microwave response to a continuous probe field, observing near-perfect ($99.7\%$) extinction of the reflection and highly efficient ($74\%$) frequency down-conversion. These proof-of-principle results lead to deterministic quantum gates between material qubits and microwave photons and open the possibility for scalable quantum networks interconnected with waveguide photons.

10 pages, 8 figures

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• Mixing of coherent waves on a single three-level artificial atom
• Dressed-state engineering for continuous detection of itinerant microwave photons
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• Key Issues Review: Useful autonomous quantum machines
• Quantum Optics in Maxwell's Fish Eye Lens with Single Atoms and Photons
• Enhancing quantum annealing performance by a degenerate two-level system
• Generation of optical Fock and W states with single-atom-based bright quantum scissors
• Deterministic three-photon down-conversion by a passive ultrastrong cavity-QED system
• Mahaux-Weidenmüller approach to cavity quantum electrodynamics and complete resonant down-conversion of the single photon frequency
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• Strong coupling between a single-photon and a two-photon Fock state
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• Synthesizing electromagnetically induced transparency without a control field in waveguide QED using small and giant atoms
• Demonstration of deterministic SWAP gate between superconducting and frequency-encoded microwave-photon qubits
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• Photon Correlations Generated by Inelastic Scattering in a One-Dimensional Waveguide Coupled to Three-Level Systems
• Quantum state transfer between a frequency-encoded photonic qubit and a quantum dot spin in a nanophotonic waveguide
• Current biased gradiometric flux qubit in a circuit-QED architecture