2,920 research outputs found
Photon echo quantum memory with complete use of natural inhomogeneous broadening
The photon echo quantum memory is based on a controlled rephasing of the
atomic coherence excited by signal light field in the inhomogeneously broadened
resonant line. Here, we propose a novel active mechanism of the atomic
rephasing which provides a perfect retrieval of the stored light field in the
photon echo quantum memory for arbitrary initial inhomogeneous broadening of
the resonant line. It is shown that the rephasing mechanism can exploit all
resonant atoms which maximally increases an optical depth of the resonant
transition that is one of the critical parameters for realization of highly
efficient quantum memory. We also demonstrate that the rephasing mechanism can
be used for various realizations of the photon echo quantum memory that opens a
wide road for its practical realization.Comment: 6 pages, 4 figure
A synchrotron superbubble in the IC 10 Galaxy: a hypernova remnant?
The nature of the synchrotron superbubble in the IC 10 galaxy is discussed
using the results of our investigation of its ionized gas structure,
kinematics, and emission spectrum from observations made with the 6-m telescope
of the Special Astrophysical Observatory of the Russian Academy of Sciences,
and based on our analysis of the radio emission of the region. The hypernova
explosion is shown to be a more plausible mechanism of the formation of the
synchrotron superbubble compared with the earlier proposed model of multiple
supernova explosions. A compact remnant of this hypernova may be identified
with the well known X-ray binary X-1 -- an accreting black hole.Comment: 4 pages, 3 EPS figures, Accepted to MNRAS (in Letters
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