We realize a hybrid superconductor-semiconductor transmon device in which the Josephson effect is controlled by gate-defined quantum dot an InAs/Al nanowire. Microwave spectroscopy of transmon's transition spectrum allows us to probe ground state parity as function gate voltages, external magnetic flux, and field applied parallel The measured phase diagram agreement with that predicted single-i...

We solve the Dirac–Bogoliubov–de Gennes equation in an impurity-free superconductor–normal-metal– superconductor junction, to determine the maximal supercurrent Ic that can flow through an undoped strip of graphene with heavily doped superconducting electrodes. The result Ic W /L e 0 / is determined by the superconducting gap 0 and by the aspect ratio of the junction length L small relative to ...

Spin filter superconducting S/I/N tunnel junctions (NbN/GdN/TiN) show a robust and pronounced Zero Bias Conductance Peak (ZBCP) at low temperatures, the magnitude of which is several times the normal state conductance of the junction. Such a conductance anomaly is representative of unconventional superconductivity and is interpreted as a direct signature of an odd frequency superconducting order.

Abstract We used the asymmetric superconducting quantum interference device (SQUID) technique to extract current phase relation (CPR) of a Josephson junction with 3D-topological insulator (3D-TI) Bi 2 Se 3 nanobelt as barrier. The obtained CPR shows deviations from standard sinusoidal pronounced forward skewness. At temperatures below 200 mK, skewness values are above zero temperature limit for...

We present a gate-voltage tunable transmon qubit (gatemon) based on planar InAs nanowires that are selectively grown high resistivity silicon substrate using III-V buffer layers. show low loss superconducting resonators with an internal quality of $2\times 10^5$ can readily be realized these substrates after the removal demonstrate coherent control and readout gatemon device relaxation time, $T...

An important step forward for the understanding of high-temperature superconductivity has been the discovery of iron-based superconductors. Among these compounds, iron pnictides could be used for high-field magnet applications, resulting more advantageous over conventional superconductors, due to a high upper critical field as well as its low anisotropy at low temperatures. However, the princip...

We describe a mechanism to detect quantum phase transition QPT in a system by a coherent probe weakly coupled to it. We illustrate this mechanism by a circuit QED architecture where a superconducting Josephson junction qubit array interacts with a one-dimensional superconducting transmission line resonator TLR . The superconducting qubit array is modeled as an Ising chain in transverse field. O...

We report on the fabrication and measurements of a superconducting junction of a single-crystalline Au nanowire, connected to Al electrodes. The current-voltage characteristic curve shows a clear supercurrent branch below the superconducting transition temperature of Al and quantized voltage plateaus on application of microwave radiation, as expected from Josephson relations. Highly transparent...

The transport critical current in high-Tc superconducting systems is considerably limited by the microstructural characteristics of these materials [1]. Indeed, if we schematize these systems as a collection of weakly-coupled superconducting islands, we may adopt Josephson junction network models to describe their electrodynamic response. With the aid of these models one can show that the maxim...