Qubits are physical, a quantum gate thus not only acts on the information carried by the qubit
but also on its energy. What is then the corresponding flow of energy between the qubit and …

While the squeezing of a propagating field can, in principle, be made arbitrarily strong, the
cavity-field squeezing is subject to the well-known 3 dB limit, and thus has limited …

Phononic frequency combs have attracted increasing attention both as a qualitatively new
type of nonlinear phenomena in vibrational systems and from the point of view of …

Creating nonclassical states of light from simple quantum systems together with classical
resources is a challenging problem. We show how chiral emitters under a coherent drive …

We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting
Nonlinear Asymmetric Inductive eLement). Such a device possesses a Kerr-free point in …

We observe the continuous emission of photons into a waveguide from a superconducting
qubit without the application of an external drive. To explain this counterintuitive observation …

Precise reconstruction of unknown quantum states from measurement data, a process
commonly called quantum state tomography, is a crucial component in the development of …

We demonstrate an on-demand source of microwave single photons with 71–99% intrinsic
quantum efficiency. The source is narrowband (300 kHz) and tuneable over a 600 MHz …

Loading quantum information deterministically onto a quantum node is an important step
toward a quantum network. Here, we demonstrate that coherent-state microwave photons …

Tailoring the decay rate of structured quantum emitters into their environment opens new
avenues for nonlinear quantum optics, collective phenomena, and quantum …