33 research outputs found
RSFQ devices with selective dissipation for quantum information processing
We study the possibility to use frequency dependent damping in RSFQ circuits
as means to reduce dissipation and consequent decoherence in RSFQ/qubit
circuits. We show that stable RSFQ operation can be achieved by shunting the
Josephson junctions with an circuit instead of a plain resistor. We derive
criteria for the stability of such an arrangement, and discuss the effect on
decoherence and the optimisation issues. We also design a simple flux generator
aimed at manipulating flux qubits
Characterization of a fabrication process for the integration of superconducting qubits and RSFQ circuits
In order to integrate superconducting qubits with rapid-single-flux-quantum
(RSFQ) control circuitry, it is necessary to develop a fabrication process that
fulfills at the same time the requirements of both elements: low critical
current density, very low operating temperature (tens of milliKelvin) and
reduced dissipation on the qubit side; high operation frequency, large
stability margins, low dissipated power on the RSFQ side. For this purpose, VTT
has developed a fabrication process based on Nb trilayer technology, which
allows the on-chip integration of superconducting qubits and RSFQ circuits even
at very low temperature. Here we present the characterization (at 4.2 K) of the
process from the point of view of the Josephson devices and show that they are
suitable to build integrated superconducting qubits
STUDIES OF CORROSIVE REACTIONS ON STEEL SURFACES BY POLARIMETRIC MĂ–SSBAUER SPECTROSCOPY
No abstract availabl