9,037 research outputs found
Spin-dependent localized Hartree-Fock density-functional approach for the accurate treatment of inner-shell excitation of close-shell atoms
We present a spin-dependent localized Hartree-Fock (SLHF) density-functional
approach for the treatment of the inner-shell excited-state calculation of
atomic systems. In this approach, the electron spin-orbitals in an electronic
configuration are obtained first by solving Kohn-Sham (KS) equation with SLHF
exchange potential. Then a single-Slater-determinant energy of the electronic
configuration is calculated by using these electron spin-orbitals. Finally, a
multiplet energy of an inner-shell excited state is evaluated from the
single-Slater-determinant energies of the electronic configurations involved in
terms of Slater's diagonal sum rule. This procedure has been used to calculate
the total and excitation energies of inner-shell excited states of close-shell
atomic systems: Be, B^+, Ne, and Mg. The correlation effect is taken into
account by incorporating the correlation potentials and energy functionals of
Perdew and Wang's (PW) or Lee, Yang, and Parr's (LYP) into calculation. The
calculated results with the PW and LYP energy functionals are in overall good
agreement with each other and also with available experimental and other ab
initio theoretical data. In addition, we present some new results for highly
excited inner-shell states.Comment: 8 pages and 9 table
On Two-Pair Two-Way Relay Channel with an Intermittently Available Relay
When multiple users share the same resource for physical layer cooperation
such as relay terminals in their vicinities, this shared resource may not be
always available for every user, and it is critical for transmitting terminals
to know whether other users have access to that common resource in order to
better utilize it. Failing to learn this critical piece of information may
cause severe issues in the design of such cooperative systems. In this paper,
we address this problem by investigating a two-pair two-way relay channel with
an intermittently available relay. In the model, each pair of users need to
exchange their messages within their own pair via the shared relay. The shared
relay, however, is only intermittently available for the users to access. The
accessing activities of different pairs of users are governed by independent
Bernoulli random processes. Our main contribution is the characterization of
the capacity region to within a bounded gap in a symmetric setting, for both
delayed and instantaneous state information at transmitters. An interesting
observation is that the bottleneck for information flow is the quality of state
information (delayed or instantaneous) available at the relay, not those at the
end users. To the best of our knowledge, our work is the first result regarding
how the shared intermittent relay should cooperate with multiple pairs of users
in such a two-way cooperative network.Comment: extended version of ISIT 2015 pape
Efficient many-party controlled teleportation of multi-qubit quantum information via entanglement
We present a way to teleport multi-qubit quantum information from a sender to
a distant receiver via the control of many agents in a network. We show that
the original state of each qubit can be restored by the receiver as long as all
the agents collaborate. However, even if one agent does not cooperate, the
receiver can not fully recover the original state of each qubit. The method
operates essentially through entangling quantum information during
teleportation, in such a way that the required auxiliary qubit resources, local
operation, and classical communication are considerably reduced for the present
purpose
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