10,157 research outputs found
Coupling Josephson qubits via a current-biased information bus
Josephson qubits without direct interaction can be effectively coupled by
sequentially connecting them to an information bus: a current-biased large
Josephson junction treated as an oscillator with adjustable frequency. The
coupling between any qubit and the bus can be controlled by modulating the
magnetic flux applied to that qubit. This tunable and selective coupling
provides two-qubit entangled states for implementing elementary quantum logic
operations, and for experimentally testing Bell's inequality.Comment: 10 pages, 1 figure. submitte
Theory for supersolid He
Although both vacancies and interstitial have relatively high activation
energies in the normal solid, we propose that a lower energy bound state of a
vacancy and an interstitial may facilitate vacancy condensation to give
supersolidity in He . We use a phenomenological two-band boson lattice
model to demonstrate this new mechanism and discuss the possible relevance to
the recently observed superfluid-like, non-classical rotational inertial
experiments of Kim and Chan in solid He. Some of our results may also be
applicable to trapped bosons in optical lattices.Comment: 5 pages, 2 figure
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