7,583 research outputs found
Particle collisions in the lower dimensional rotating black hole space-time with the cosmological constant
In this paper, we study the effect of ultra-high energy collisions of two
particles with different energies near the horizon of a 2+1 dimensional BTZ
black hole (BSW effect). We find that the particle with the critical angular
momentum could exist inside the outer horizon of BTZ black hole regardless of
the particle energy. Therefore, for the non-extremal BTZ black hole, the BSW
process is possible on the inner horizon with the fine tuning of parameters
which are characterized by the motion of particle. While for the extremal BTZ
black hole, the particle with the critical angular momentum could only exist on
the degenerate horizon, and the BSW process could also happen there.Comment: 12 pages,3 figure
Controlling soliton interactions in Bose-Einstein condensates by synchronizing the Feshbach resonance and harmonic trap
We present how to control interactions between solitons, either bright or
dark, in Bose-Einstein condensates by synchronizing Feshbach resonance and
harmonic trap. Our results show that as long as the scattering length is to be
modulated in time via a changing magnetic field near the Feshbach resonance,
and the harmonic trapping frequencies are also modulated in time, exact
solutions of the one-dimensional nonlinear Schr\"{o}dinger equation can be
found in a general closed form, and interactions between two solitons are
modulated in detail in currently experimental conditions. We also propose
experimental protocols to observe the phenomena such as fusion, fission, warp,
oscillation, elastic collision in future experiments.Comment: 7 pages, 7 figure
Nanocrystals in silicon photonic crystal standing-wave cavities as spin-photon phase gates for quantum information processing
By virtue of a silicon high-Q photonic crystal nanocavity, we propose and
examine theoretically interactions between a stationary electron spin qubit of
a semiconductor nanocrystal and a flying photon qubit. Firstly, we introduce,
derive and demonstrate for the first time the explicit conditions towards
realization of a spin-photon two-qubit phase gate, and propose these
interactions as a generalized quantum interface for quantum information
processing. Secondly, we examine novel single-spin-induced reflections as
direct evidence of intrinsic bare and dressed modes in our coupled
nanocrystal-cavity system. The excellent physical integration of this silicon
system provides tremendous potential for large-scale quantum information
processing
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