Parametrically-controlled microwave-photonic interface for the fluxonium

Abstract

Converting quantum information from stationary qubits to traveling photons enables both fast qubit initialization and efficient generation of flying qubits for redistribution of quantum information. This conversion can be performed using cavity-sideband transitions. In the fluxonium, however, direct cavity-sideband transitions are forbidden due to parity symmetry. Here we circumvent this parity selection rule by using a three-wave mixing element to couple the fluxonium to a resonator. We experimentally demonstrate a scheme for interfacing the fluxonium with traveling photons through microwave-induced parametric conversion. We perform fast reset on the fluxonium qubit, initializing it with >95% ground-state population. We then implement controlled release and temporal shaping of a flying photon, useful for quantum state transfer and remote entanglement. The simplicity and flexibility of our demonstrated scheme enables fluxonium-based remote entanglement architectures.

12 pages, 12 figures, added simulation and figures

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Cited by in corpus (5)

• A high-efficiency plug-and-play superconducting qubit network
• Josephson traveling-wave parametric amplifier based on low-intrinsic-loss coplanar lumped-element waveguide
• Parametric multi-element coupling architecture for coherent and dissipative control of superconducting qubits
• Generation of Frequency-Tunable Shaped Single Microwave Photons Using a Fixed-Frequency Superconducting Qubit
• Systematic Construction of Time-Dependent Hamiltonians for Microwave-Driven Josephson Circuits