Driving forbidden transitions in the fluxonium artificial atom

Abstract

Atomic systems display a rich variety of quantum dynamics due to the different possible symmetries obeyed by the atoms. These symmetries result in selection rules that have been essential for the quantum control of atomic systems. Superconducting artificial atoms are mainly governed by parity symmetry. Its corresponding selection rule limits the types of quantum systems that can be built using electromagnetic circuits at their optimal coherence operation points ("sweet spots"). Here, we use third-order nonlinear coupling between the artificial atom and its readout resonator to drive transitions forbidden by the parity selection rule for linear coupling to microwave radiation. A Lambda-type system emerges from these newly accessible transitions, implemented here in the fluxonium artificial atom coupled to its "antenna" resonator. We demonstrate coherent manipulation of the fluxonium artificial atom at its sweet spot by stimulated Raman transitions. This type of transition enables the creation of new quantum operations, such as the control and readout of physically protected artificial atoms.

arXiv comment10 pages, 7 figures

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• Superconducting circuit protected by two-Cooper-pair tunneling
• Quantum control of an oscillator using stimulated nonlinearity
• Universal gates for protected superconducting qubits using optimal control
• Observation and stabilization of photonic Fock states in a hot radio-frequency resonator
• Large-scale GHZ states through topologically protected zero-energy mode in a superconducting qutrit-resonator chain
• Geometric superinductance qubits: Controlling phase delocalization across a single Josephson junction
• Designing Kerr Interactions for Quantum Information Processing via Counterrotating Terms of Asymmetric Josephson-Junction Loops
• A superconducting qubit with noise-insensitive plasmon levels and decay-protected fluxon states
• Experimental implementation of a Raman-assisted six-quanta process
• Parity-Engineered Light-Matter Interaction
• A high-efficiency plug-and-play superconducting qubit network
• Hardware implementation of quantum stabilizers in superconducting circuits
• Hamiltonian quantum computing with superconducting qubits
• Parametrically-controlled microwave-photonic interface for the fluxonium
• Magnon-mediated quantum gates for superconducting qubits
• Impact of Josephson junction array modes on fluxonium readout
• Bound states in the continuum in a fluxonium qutrit
• Resilient superconducting-element design with genetic algorithms