64,165 research outputs found
Coherent output of photons from coupled superconducting transmission line resonators controlled by charge qubits
We study the coherent control of microwave photons propagating in a
superconducting waveguide consisting of coupled transmission line resonators,
each of which is connected to a tunable charge qubit. While these coupled line
resonators form an artificial photonic crystal with an engineered photonic band
structure, the charge qubits collectively behave as spin waves in the low
excitation limit, which modify the band-gap structure to slow and stop the
microwave propagation. The conceptual exploration here suggests an
electromagnetically controlled quantum device based on the on-chip circuit QED
for the coherent manipulation of photons, such as the dynamic creation of
laser-like output from the waveguide by pumping the artificial atoms for
population inversion.Comment: 8 pages, 3 figure
Anatomy of molecular structures in Ne
We present a beyond mean-field study of clusters and molecular structures in
low-spin states of Ne with a multireference relativistic energy density
functional, where the dynamical correlation effects of symmetry restoration and
quadrupole-octupole shapes fluctuation are taken into account with projections
on parity, particle number and angular momentum in the framework of the
generator coordinate method. Both the energy spectrum and the electric
multipole transition strengths for low-lying parity-doublet bands are better
reproduced after taking into account the dynamical octupole vibration effect.
Consistent with the finding in previous studies, a rotation-induced dissolution
of the O molecular structure in Ne is predicted.Comment: 6 pages with 6 figures, version to be published in Phys. Lett.
Theoretical understanding of the quasiparticle dispersion in bilayer high- superconductors
The renormalization of quasiparticle (QP) dispersion in bilayer high-
cuprates is investigated theoretically by examining respectively the
interactions of the QP with spin fluctuations (SF) and phonons. It is
illustrated that both interactions are able to give rise to a kink in the
dispersion around the antinodes (near ). However, remarkable
differences between the two cases are found for the peak/dip/hump structure in
the lineshape, the QP weight, and the interlayer coupling effect on the kink,
which are suggested to serve as a discriminance to single out the dominant
interaction in the superconducting state. A comparison to recent photoemission
experiments shows clearly that the coupling to the spin resonance is dominant
for the QP around antinodes in bilayer systems.Comment: 4 pages, 4 figure
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