408 research outputs found
Generation of pure, ionic entangled states via linear optics
In this paper, we propose a novel scheme to generate two-ion maximally
entangled states from either pure product states or mixed states using linear
optics. Our new scheme is mainly based on the ionic interference. Because the
proposed scheme can generate pure maximally entangled states from mixed states,
we denote it as purification-like generation scheme. The scheme does not need a
Bell state analyzer as the existing entanglement generation schemes do, it also
avoids the difficulty of synchronizing the arrival time of the two scattered
photons faced by the existing schemes, thus the proposed new entanglement
generation scheme can be implemented more easily in practice.Comment: 6 pages, 4 figure
Entanglement in the anisotropic Heisenberg XYZ model with different Dzyaloshinskii-Moriya interaction and inhomogeneous magnetic field
We investigate the entanglement in a two-qubit Heisenberg XYZ system with
different Dzyaloshinskii-Moriya(DM) interaction and inhomogeneous magnetic
field. It is found that the control parameters (, and )
are remarkably different with the common control parameters (,
and ) in the entanglement and the critical temperature, and these
x-component parameters can increase the entanglement and the critical
temperature more efficiently. Furthermore, we show the properties of these
x-component parameters for the control of entanglement. In the ground state,
increasing (spin-orbit coupling parameter) can decrease the critical
value and increase the entanglement in the revival region, and
adjusting some parameters (increasing and , decreasing and
) can decrease the critical value to enlarge the revival
region. In the thermal state, increasing can increase the revival
region and the entanglement in the revival region (for or ), and
enhance the critical value to make the region of high entanglement
larger. Also, the entanglement and the revival region will increase with the
decrease of (uniform magnetic field). In addition, small
(nonuniform magnetic field) has some similar properties to , and with
the increase of the entanglement also has a revival phenomenon, so that
the entanglement can exist at higher temperature for larger .Comment: 8 pages, 8 figure
Implementation of quantum algorithms with resonant interactions
We propose a scheme for implementing quantum algorithms with resonant
interactions. Our scheme only requires resonant interactions between two atoms
and a cavity mode, which is simple and feasible. Moreover, the implementation
would be an important step towards the fabrication of quantum computers in
cavity QED system.Comment: 4 pages, 3 figure
Scheme for deterministic Bell-state-measurement-free quantum teleportation
A deterministic teleportation scheme for unknown atomic states is proposed in
cavity QED. The Bell state measurement is not needed in the teleportation
process, and the success probability can reach 1.0. In addition, the current
scheme is insensitive to the cavity decay and thermal field.Comment: 3 pages, no figur
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