Advances in materials science and engineering have played a central role in the
development of classical computers and will undoubtedly be critical in propelling the …

Quantum-mechanical effects at the macroscopic level were first explored in Josephson-
junction-based superconducting circuits in the 1980s. In recent decades, the emergence of …

The performance of superconducting quantum circuits for quantum computing has advanced
tremendously in recent decades; however, a comprehensive understanding of relaxation …

Superconducting qubits are a leading system for realizing large-scale quantum processors,
but overall gate fidelities suffer from coherence times limited by microwave dielectric loss …

The unique features of quantum theory offer a powerful new paradigm for information
processing. Translating these mathematical abstractions into useful algorithms and …

We present a transmon qubit fabrication technique that yields systematic improvements in T
1 relaxation times. We encapsulate the surface of niobium and prevent the formation of its …

Photonic technologies offer numerous functionalities that can be used to realize
astrophotonic instruments. The most spectacular example to date is the ESO Gravity …

Materials imperfections in planar superconducting quantum circuits—in particular, two-level-
system (TLS) defects—contribute significantly to decoherence, ultimately limiting the …

Gate-tunable transmons (gatemons) employing semiconductor Josephson junctions have
recently emerged as building blocks for hybrid quantum circuits. In this study, we present a …

The progress witnessed within the field of quantum computing has been enabled by the
identification and understanding of interactions between the state of the quantum bit (qubit) …