The performance of a wide range of quantum computing algorithms and protocols depends
critically on the fidelity and speed of the employed qubit readout. Examples include gate …

Fast, high-fidelity, and quantum nondemolition (QND) qubit readout is an essential element
of quantum information processing. For superconducting qubits, state-of-the-art readout is …

Andreev (or superconducting) spin qubits (ASQs) have recently emerged as a promising
qubit platform that combines superconducting circuits with semiconductor spin degrees of …

Qubit-specific measurement in a superconducting quantum processor requires physical
interconnects that traverse 4 orders of magnitude in temperature from 293 K to 10 mK …

The dispersive-readout scheme enables quantum nondemolition measurement of
superconducting qubits. An increased readout power can shorten the readout time and …

Multi-photon processes deteriorate the quantum non-demolition (QND) character of the
dispersive readout in circuit QED, causing readout to lag behind single and two-qubit gates …

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 …

Much attention has focused on the transmon architecture for large-scale superconducting
quantum devices; however, the fluxonium qubit has emerged as a possible successor. With …

We demonstrate a qubit-readout architecture where the dispersive coupling is entirely
mediated by a kinetic inductance. This allows us to engineer the dispersive shift of the …

Qudits provide a resource-efficient alternative to qubits for quantum information processing.
The multilevel nature of the transmon, with its individually resolvable transition frequencies …