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Huadong Shifan Daxue xuebao. Ziran kexue ban

Preparation of Entangled Squeezed Coherent States

Lei Ma

Published Jan 1, 2005• 0 citations
OpenAlex

Abstract

A scheme was presented for the generation of bipartite and multipartite entangled squeezed coherent states. In the scheme, a V-type three-level atom was sent through many single-mode cavities filled with squeezed coherent field. The whole system was entangled via the atom-cavity Raman interaction. Then detection the atom leaves the cavity system in an entangled state.

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A scheme was presented for the generation of bipartite and multipartite entangled squeezed coherent states. In the scheme, a V-type three-level atom was sent through many single-mode cavities filled with squeezed coherent field. The whole system was entangled via the atom-cavity Raman interaction. Then detection the atom leaves the cavity system in an entangled state.
A method is presented for generating highly squeezed states of a cavity field via the atom-cavity field interaction of the Raman type. In the scheme a sequence of three-level -type atoms interacts with a cavity field, displaced by a classical source, in a Raman manner. Then the atomic states are measured. By this way the cavity field may collapse onto a superposition of several coherent states, which exhibits strong squeezing. The scheme can also be used to prepare superpositions of many two-mode coherent states for two cavity fields. The coherent states in each mode are on a straight line. This is the first way for preparing multi-component entangled coherent states of this type in cavity QED.
A method is presented for generating highly squeezed states of a cavity field via the atom-cavity field interaction of the Raman type. In the scheme a sequence of three-level A-type atoms interacts with a cavity field, displaced by a classical source, in a Rarman manner. Then the atomic states are measured. By this way the cavity field may collapse onto a superposition of several coherent states, which exhibits strong squeezing. The scheme can also be used to prepare superpositions of many two-mode coherent states for two cavity fields. The coherent states in each mode are on a straight line. This is the first way for preparing multi-component entangled coherent states of this type in cavity QED.
In quantum communication and quantum computing, the Bell state acts as an important role.For two qubit of discrete variable, Bell state is composted by two orthogonal to each other's physical state of a physical system.For the physical system consisting of continuous variables, a scheme is presented for generating the quasi-Bell-states of entangled squeezed states by using the Raman interaction of an Λ-type three-level atom with squeezed vacuum states (SVS) cavity fields.In this scheme, an atom initially prepared in its ground state is injected in proper order into several cavities initially prepared each in the SVS.After the atom interacting with these cavities, the entanglement of atom-cavity-field is generated.Afterwards, by measuring the atom we obtain the quasi-Bell-states of the entangled squeezed states.Also, the entanglement properties of bipartite entangled quasi-Bell-states as well as multipartite entangled SVSs are discussed.
A scheme is proposed for the generation of superpositions of multi-mode coherent states, i.e. multi-mode Schrödinger cat states. In the scheme a -type three-level atom is sent through many cavities filled with coherent fields. The whole system is entangled via the Raman atom-field interaction. Then the detection of the atom leaves the cavity system in a multi-mode cat state. Under certain conditions, such a cat state is identical to a Greenberger-Horne-Zeilinger state and thus can be used to test local realistic theories.