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"Instantaneous superluminality" in a bimetallic wire consisting of a superconducting aluminum wire plated with a thick copper covering
"Instantaneous superluminality" bimetallic wire consisting superconducting aluminum wire plated thick copper covering
2010/12/20
We shall analyze here the transmission of microwave-frequency electrical pulses through a \bimetallic" wire consisting of superconducting aluminum (Al) wire covered with a thick, nonsuperconducting co...
Wirebond crosstalk and cavity modes in large chip mounts for superconducting qubits
Wirebond crosstalk cavity modes large chip mounts superconducting qubits
2010/11/25
We analyze the performance of a microwave chip mount that uses
wirebonds to connect the chip and mount grounds. A simple impedance ladder model predicts that transmission crosstalk between two feedli...
Universal Conductance Fluctuations in Mesoscopic Systems with Superconducting Leads: Beyond the Andreev Approximation
Universal Conductance Fluctuations Mesoscopic Systems Superconducting Leads
2010/11/22
We report our investigation of the sample to sample fluctuation in transport properties of phase co-herent normal metal-superconductor hybrid systems. Extensive numerical simulations were carried out ...
Figure "8" gravitational-wave antenna using a superconducting-core coaxial cable: Continuity equation and its superluminal consequences
antenna superconducting-core coaxial cabl Continuity equation superluminal consequences
2010/12/20
In our Prague paper [1], we predicted that the Cooper pairs will respond to a gravitational (GR) wave di erently from the ions of the ionic lattice of a superconductor (SC), because there exists a glo...
Quantum Incompressibility of a Freely Falling Hydrogen Atom in a Circular Rydberg State, and a Gravitationally-Induced Charge Separation Effect in Superconducting Systems
Quantum Hydrogen Atom Circular Rydberg State Gravitationally-Induced Charge Separation Effect
2010/12/21
Freely falling point-like objects converge toward the center of the Earth. Hence the gravitational field of the Earth is inhomogeneous, and possesses a tidal component. The free fall of an extended qu...
We fabricate superconducting ion traps with niobium and niobium nitride and trap single 88Sr ions at cryogenic temperatures. The superconducting transition is verified and characterized by measuring t...
Quantitative evaluation of defect-models in superconducting phase qubits
Quantitative evaluation defect-models superconducting phase qubits
2010/11/11
We use high-precision spectroscopy and detailed theoretical modelling to determine the form of the coupling between a superconducting phase qubit and a two-level defect. Fitting the experimental data ...
Landau-Zener-Stückelberg Interference of Microwave Dressed States of a Superconducting Phase Qubit
Landau-Zener-Stückelberg Interference Microwave Dressed States Superconducting Phase Qubit
2010/11/11
Dressed state, the eignstate of a combined system of light and matter, has been proposed as fundamental concept to interpret quantum interaction between photons and atoms or molecules. Recently, this...
Interface Between Topological and Superconducting Qubits
Interface Topological Superconducting Qubits
2010/11/11
We propose and analyze an interface between a topological qubit and a superconducting flux qubit. In our scheme, the interaction between Majorana fermions in a topological insulator is coherently cont...
Design and Testing of Superconducting Microwave Passive Components for Quantum Information Processing
Design Testing Superconducting Microwave Passive Components Quantum Information Processing
2010/11/5
We report on the design, fabrication and testing of two superconducting passive microwave components, a quadrature hybrid and a 20 dB directional coupler. These components are designed to be integrate...
Macroscopic quantum tunneling in multigap superconducting Josephson junctions: Escape rate enhancement via quantum fluctuations of Josephson-Leggett mode
Macroscopic quantum superconducting Josephson Escape rate enhancement Josephson-Leggett mode
2010/11/5
We theoretically study the macroscopic quantum tunneling (MQT) in a hetero Josephson junction formed by a conventional single-gap superconductor and a multi-gap one such as ${MgB}_{2}$ and iron-based...
Observation of quantum jumps in a superconducting artificial atom
quantum jumps superconducting artificial atom
2010/10/27
We continuously measure the state of a superconducting quantum bit coupled to a microwave
readout cavity by using a fast, ultralow-noise parametric ampli er. This arrangement allows us to observe qua...
A Superconducting 180° Hybrid Ring Coupler for circuit Quantum Electrodynamics
Superconducting circuit Quantum Electrodynamics
2010/10/27
Superconducting circuit quantum electrodynamics experiments with propagating microwaves require devices acting as beam splitters. Using niobium thin lms on silicon and sapphire substrates, we fabrica...
Two independent teams of physicists in the US have entangled three superconducting quantum bits (qubits) for the first time. Entangled trios are of particular interest to those building quantum comput...
A superconducting qubit with Purcell protection and tunable coupling
superconducting qubit Purcell protection tunable coupling
2010/10/27
We present a superconducting qubit for the circuit quantum electrodynamics architecture that has a tunable coupling strength g. We show that this coupling strength can be tuned from zero to values tha...