# Publications

### 2016

2016

, Nature Communications, 7, pp. 12930

Contextuality is one of the most fundamental properties of quantum mechanics, distinguishing it from classical physics without a need for nonlocality or entanglement. It is also a critical resource for exponential speedup in universal surface-code quantum computing. Our result is the first experiment violating a noncontextuality inequality with an indivisible system where entanglement cannot be defined which also addresses all known major loopholes, such as the detection, compatibility and individual-existence loopholes. Violating noncontextuality with superconducting circuits, a leading candidate for implementing surface-code quantum computing, comprises an important conceptual milestone in demonstrating their suitability for quantum technological applications.

### 2015

2015

, Phys. Rev. B, 92, pp. 224304

The paper theoretically studies effects of the higher non linearities originated from a Josephson junction on the Josephson parametric amplifier (JPA). The results help to understand the gain saturation and reveal some of the effects which were not identified in the previous theoretical studies. Some interesting stipulations on the possible new regimes of the JPA are also deiscussed.

2015

, Physica Scripta, 90, 2, pp. 25504

We discuss a similarity between resonant oscillations in two nonlinear systems; namely, a chain

of coupled Duffing oscillators and a bilayer fish-scale metamaterial. In such systems two

### 2014

2014

, Nature Communications, 5, pp. 5146

Implementation of a quantum metamaterial using superconducting qubits

### 2013

2013

, Science, 342, 6165, pp. 1494-1496

We use two superconducting qubits in an open one-dimensional transmission line to study unprecedently strong photon-mediated interactions. Also at arxiv.org.

2013

, Physical Review A, 88, 4

We study the collective effects that emerge in waveguide quantum electrodynamics where several (artificial) atoms are coupled to a one-dimensional superconducting transmission line.

2013

, Nature, 500, 7462, pp. 319-322

We demosntrate the first experimental implementation in solid state.