Is state tomography an unambiguous test of quantum entanglement? (2009)
Grønbech-Jensen, Niels, Marchese, Jeffrey E., Cirillo, Matteo, Blackburn, James A.
We provide an alternative interpretation of recently published experimental results that were represented as demonstrating entanglement between two macroscopic quantum Josephson oscillators. We model...
Investigation of resonant and transient phenomena in Josephson junction flux qubits (2008)
Marchese, Jeffrey E., Cirillo, Matteo, Grønbech-Jensen, Niels
We present an analytical and computational study of resonances and transient responses in a classical Josephson junction system. A theoretical basis for resonances in a superconducting loop with...
A Classical Analysis of Capacitively Coupled Superconducting Qubits (2008)
Blackburn, James A., Marchese, Jeffrey E., Cirillo, Matteo, Grønbech-Jensen, Niels
An electrical circuit consisting of two capacitively coupled inductive loops, each interrupted by a Josephson junction, is analyzed through the classical RSCJ model. The same circuit has recently...
Classical analogs for Rabi-oscillations, Ramsey-fringes, and spin-echo in Josephson junctions (2007)
Marchese, Jeffrey E., Cirillo, Matteo, Gronbech-Jensen, Niels
We investigate the results of recently published experiments on the quantum behavior of Josephson circuits in terms of the classical modelling based on the resistively and capacitively-shunted (RCSJ)...
Simulating Ramsey-Type Fringes in a Pulsed Microwave-Driven Classical Josephson Junction (2006)
Marchese, Jeffrey E., Cirillo, Matteo, Grønbech-Jensen, Niels
We present evidence for a close analogy between the nonlinear behavior of a pulsed microwave-driven Josephson junction at low temperature and the experimentally observed behavior of Josephson systems...
Marchese, Jeffrey E., Cirillo, Matteo, Grønbech-Jensen, Niels
We present a classical analysis of the transient response of Josephson junctions perturbed by microwaves and thermal fluctuations. The results include a specific low frequency modulation in phase and...
Rabi-type oscillations in a classical Josephson junction (2005)
Gronbech-Jensen, Niels, Cirillo, Matteo
We study analytically and numerically the phase-modulation properties of a biased classical Josephson tunnel junction in the zero-voltage state and phase-locked to an external ac field. We show that...
Ac-induced thermal vortex escape in magnetic-field-embedded long annular Josephson junctions (2004)
Gronbech-Jensen, Niels, Cirillo, Matteo
We investigate theoretically the thermal escape behavior of trapped magnetic fluxons in long annular Josephson junctions in dc magnetic fields, and perturbed by a probing ac current. The study is...