10,193 research outputs found
Adiabatic quantum state transfer in non-uniform triple-quantum-dot system
We introduce an adiabatic quantum state transfer scheme in a non-uniform
coupled triple-quantum-dot system. By adiabatically varying the external gate
voltage applied on the sender and receiver, the electron can be transferred
between them with high fidelity. By numerically solving the master equation for
a system with always-on interaction, it is indicated that the transfer fidelity
depends on the ration between the peak voltage and the maximum coupling
constants. The effect of coupling mismatch on the transfer fidelity is also
investigated and it is shown that there is a relatively large tolerance range
to permit high fidelity quantum state transfer.Comment: 6 pages, 5 figure
A two component jet model for the X-ray afterglow flat segment in short GRB 051221A
In the double neutron star merger or neutron star-black hole merger model for
short GRBs, the outflow launched might be mildly magnetized and neutron rich.
The magnetized neutron-rich outflow will be accelerated by the magnetic and
thermal pressure and may form a two component jet finally, as suggested by
Vlahakis, Peng & K\"{o}nigl (2003). We show in this work that such a two
component jet model could well reproduce the multi-wavelength afterglow
lightcurves, in particular the X-ray flat segment, of short GRB 051221A. In
this model, the central engine need not to be active much longer than the
prompt ray emission.Comment: 11 pages, 2 figure; Accepted for publication by ApJ
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