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Journal of Atomic and Molecular Physics

Entanglement concentration of the entangled squeezed state by two-level atom interacting with cavity fields

Cai Xin

Published Jan 1, 2011• 0 citations
OpenAlex

Abstract

Base on the dispersive atom-cavity field interaction,the scheme for preparing the entangled squeezed state is discussed.An experimentally feasible protocol for realizing entanglement concentration of the entangled squeezed states by using a two-level atom interacting with caving fields is proposed.In this protocol,the entanglement between two squeezed states,|ξand |-ξ,with the same amplitude but a phase difference π is utilized as the quantum channel.The process of the entanglement concentration is implemented by using a two-level atom interacting with caving fields and two-mode orthogonal states measurement.With the present development of cavity quantum electrodynamics(QED)techniques, the scheme can be achieved.

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Base on the dispersive atom-cavity field interaction,the scheme for preparing the entangled squeezed state is discussed.An experimentally feasible protocol for realizing entanglement concentration of the entangled squeezed states by using a two-level atom interacting with caving fields is proposed.In this protocol,the entanglement between two squeezed states,|ξand |-ξ,with the same amplitude but a phase difference π is utilized as the quantum channel.The process of the entanglement concentration is implemented by using a two-level atom interacting with caving fields and two-mode orthogonal states measurement.With the present development of cavity quantum electrodynamics(QED)techniques, the scheme can be achieved.
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Base on the dispersive atom-cavity field interaction,the scheme for preparing the entangled coherent state is discussed.An experimentally feasible protocol for realizing entanglement diversion of the entangled coherent states by using a two-level atom interacting with caving fields is proposed.In this scheme,the entanglement between two coherent states,|α〉and|-α〉,with the same amplitude but a phase differenceπis utilized as the quantum channel.The process of the entanglement diversion is implemented by using the two-level atom interacting with caving fields,two-modes orthogonal states measurement and with the help of classical information.With the present development of cavity quantum electrodynamics (QED) techniques,the scheme can be achieved.
We propose a scheme to generate superposition and entanglement between the mesoscopic squeezed vacuum states by considering the two-photon interaction of NNN two-level atoms in a cavity with high quality factor, assisted by a strong driving field. By virtue of specific choices of the cavity detuning, a number of multiparty entangled states can be prepared, including the entanglement between the atomic and the squeezed vacuum cavity states and between the squeezed vacuum states and the coherent states of the cavities. We also present how to prepare entangled states and ``Schr\"odinger cats'' states regarding the squeezed vacuum states of the cavity modes. The possible extension and application of our scheme are discussed. Our scheme is close to the reach with current cavity QED techniques.
We propose a theoretical model for realizing a photonic two-qubit phase gate in cavity QED using a one-step process. The fidelity and probability of success of the conditional quantum phase gate is very high in the presence of cavity decay. Our scheme only employs one two-level atom, and thus is much simpler than other schemes involving multi-level atoms. This proposal can also be applied to generate two-mode squeezed states; therefore, we give three examples, i.e., the two-mode squeezed vacuum state, two-mode squeezed odd coherent state, and two-mode squeezed even coherent state, to estimate the variance of Duan’s criterion when taking into account cavity decay. It is shown that the variance is smaller than 2 for the three squeezed states in most cases. Furthermore, we utilize logarithmic negativity to measure the entanglement, and find that these squeezed states have very high degrees of entanglement.