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Meeting ID: 379 144 336
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Abstract: 

 

This thesis reports recent achievements and current experimental progress with fluxonium, a species of superconducting qubits with rich energies spectrum and selection rules similar to those found in natural atoms rather than other weakly-anharmonic superconducting qubits. At arbitrary flux, we show how these selection rules can be engineered to realize long-lived metastable states. At half integer flux quantum bias, we show that fluxonium has high coherence by design, the highest observed in At half integer flux quantum bias, we show that fluxonium has high coherence by design, the highest observed in superconducting circuits so far, while exhibiting the same level of addressability as found in more conventional superconducting qubits. In addition, a control-Z gate can be implemented by sending a short 2π-pulse at the frequency near the 1→2 transition of the target qubit. The gate transition has higher frequency and larger matrix element than the qubit transition, resulting in a fast and high fidelity entangling gate. We also discuss experimental techniques used to characterize the qubits, and perspectives on future quantum systems based on fluxonium qubits.