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 …

In the past 20 years, impressive progress has been made both experimentally and
theoretically in superconducting quantum circuits, which provide a platform for manipulating …

During the last ten years, superconducting circuits have passed from being interesting
physical devices to becoming contenders for near-future useful and scalable quantum …

Amorphous solids show surprisingly universal behaviour at low temperatures. The
prevailing wisdom is that this can be explained by the existence of two-state defects within …

Simulating quantum mechanics is known to be a difficult computational problem, especially
when dealing with large systems. However, this difficulty may be overcome by using some …

A quantum computer can solve hard problems, such as prime factoring,, database
searching, and quantum simulation, at the cost of needing to protect fragile quantum states …

The performance of superconducting circuits for quantum computing is limited by materials
losses. In particular, coherence times are typically bounded by two-level system (TLS) …

Here we report on the production and tomography of genuinely entangled Greenberger-
Horne-Zeilinger states with up to ten qubits connecting to a bus resonator in a …

We demonstrate a planar, tunable superconducting qubit with energy relaxation times up to
44 μ s. This is achieved by using a geometry designed to both minimize radiative loss and …

Significant advances in coherence render superconducting quantum circuits a viable
platform for fault-tolerant quantum computing. To further extend capabilities, highly coherent …