252 research outputs found
Series solution to the laser-ion interaction in a Raman-type configuration
The Raman interaction of a trapped ultracold ion with two travelling wave
lasers is studied analytically with series solutions, in the absence of the
rotating wave approximation (RWA) and the restriction of both the Lamb-Dicke
limit and the weak excitation regime. The comparison is made between our
solutions and those under the RWA to demonstrate the validity region of the
RWA. As a practical example, the preparation of Schr\"odinger-cat states with
our solutions is proposed beyond the weak excitation regime.Comment: 15 Pages, 3 Figure
Complete solution of the Schr\"odinger equation for the time-dependent linear potential
The complete solutions of the Schr\"odinger equation for a particle with
time-dependent mass moving in a time-dependent linear potential are presented.
One solution is based on the wave function of the plane wave, and the other is
with the form of the Airy function. A comparison is made between the present
solution and former ones to show the completeness of the present solution.Comment: Revtex, No figure
Scalable quantum information processing with atomic ensembles and flying photons
We present a scheme for scalable quantum information processing (QIP) with
atomic ensembles and flying photons. Using the Rydberg blockade, we encode the
qubits in the collective atomic states, which could be manipulated fast and
easily due to the enhanced interaction, in comparison to the single-atom case.
We demonstrate that our proposed gating could be applied to generation of
two-dimensional cluster states for measurement-based quantum computation.
Moreover, the atomic ensembles also function as quantum repeaters useful for
long distance quantum state transfer. We show the possibility of our scheme to
work in bad cavity or in weak coupling regime, which could much relax the
experimental requirement. The efficient coherent operations on the ensemble
qubits enable our scheme to be switchable between quantum computation and
quantum communication using atomic ensembles.Comment: 8 pages, 7 figure
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