We review some of the recent efforts in devising and engineering bosonic qubits for
superconducting devices, with emphasis on the Gottesman–Kitaev–Preskill (GKP) qubit. We …

Long coherence times, large anharmonicity, and robust charge-noise insensitivity render
fluxonium qubits an interesting alternative to transmons. Recent experiments have …

The spin-orbit interaction in spin qubits enables spin-flip transitions, resulting in Rabi
oscillations when an external microwave field is resonant with the qubit frequency. Here, we …

We present a recursive formula for the computation of the static effective Hamiltonian of a
system under a fast-oscillating drive. Our analytical result is well-suited to symbolic …

We derive a universal nonperturbative bound on the distance between unitary evolutions
generated by time-dependent Hamiltonians in terms of the difference of their integral …

Semiconductor spin qubits demonstrated single-qubit gates with fidelities up to $99.9\% $
benchmarked in the single-qubit subspace. However, tomographic characterizations reveal …

Deriving effective Hamiltonian models plays an essential role in quantum theory, with
particular emphasis in recent years on control and engineering problems. In this work, we …

The rotating-wave approximation (RWA) is ubiquitous in the analysis of driven and coupled
resonators. However, the limitations of the RWA seem to be poorly understood and in some …

Periodically driven systems engender a rich competition between the timescales of the
drives and those of the system, leading to a limited ability to describe the system in full. We …

We report observations of transitions between excited states in the Jaynes-Cummings
ladder of circuit quantum electrodynamics with electron spins (spin circuit QED). We show …