907 research outputs found
Concentration for unknown atomic entangled states via cavity decay
We present a physical scheme for entanglement concentration of unknown atomic
entangled states via cavity decay. In the scheme, the atomic state is used as
stationary qubit and photonic state as flying qubit, and a close maximally
entangled state can be obtained from pairs of partially entangled states
probabilistically.Comment: Three pages, Two figure
Prompt Ultraviolet-to-Soft-X-Ray Emission of Gamma-Ray Bursts: Application to GRB 031203?
We discuss the prompt emission of GRBs, allowing for pair
production and synchrotron self-absorption. The observed hard spectra suggest
heavy pair-loading in GRBs. The re-emission of the generated pairs results in
the energy transmission from high-energy gamma-rays to long-wavelength
radiation. Due to strong self-absorption, the synchrotron radiation by pairs is
in optically thick regime, showing a thermal-like spectral bump in the
extreme-ultraviolet/soft X-ray band, other than the peak from the main burst.
Recently, the prompt soft X-ray emission of GRB 031203 was detected thanks to
the discovery of a delayed dust echo, and it seems to be consistent with the
model prediction of a double-peak structure. The confirmation of the
thermal-like feature and the double-peak structure by observation would
indicate that the dominant radiation mechanism in GRBs is synchrotron rather
than inverse-Compton radiation.Comment: ApJL accepted, shortened to match the 4 page limit, aastex styl
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