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 qubits has improved by several orders of magnitude in
the past decade. These circuits benefit from the robustness of superconductivity and the …

This article reviews recent theoretical and experimental advances in the fundamental
understanding and active control of quantum fluids of light in nonlinear optical systems. In …

In contrast to a single quantum bit, an oscillator can store multiple excitations and
coherences provided one has the ability to generate and manipulate complex multiphoton …

The ability to generate particles from the quantum vacuum is one of the most profound
consequences of Heisenberg's uncertainty principle. Although the significance of vacuum …

Abstract The Jaynes‐Cummings model describes the coupling between photons and a
single two‐level atom in a simplified representation of light‐matter interactions. In circuit …

Measuring a quantum system can randomly perturb its state. The strength and nature of this
back-action depend on the quantity that is measured. In a partial measurement performed by …

The enormous experimental progress in atomic, molecular, and optical (AMO) physics
during the last decades allows us nowadays to isolate single, a few or even many-body …

The von Neumann architecture for a classical computer comprises a central processing unit
and a memory holding instructions and data. We demonstrate a quantum central processing …

We demonstrate a superconducting resonator with variable coupling to a measurement
transmission line. The resonator coupling can be adjusted through zero to a photon …