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Natural Science Journal of Xiangtan University

Teleportation of Multi-Atom Cat-Like States with Partially Entangled States

Xiong Wen-yuan

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

An experimentally feasible scheme for implementing teleportation of multi-atom cat-like states via partially entangled states is proposed.In the scheme,the probability of teleporting multi-atom cat-like is two times of square of the smaller coefficient of the superposition state serving as quantum channel,i.e.,the biggest probability of implementing teleportation with such class of entangled states.Moreover,our scheme is insensitive to cavity decay,because atoms are interacting with a large detuning vacuum cavity field.

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An experimentally feasible scheme for implementing teleportation of multi-atom cat-like states via partially entangled states is proposed.In the scheme,the probability of teleporting multi-atom cat-like is two times of square of the smaller coefficient of the superposition state serving as quantum channel,i.e.,the biggest probability of implementing teleportation with such class of entangled states.Moreover,our scheme is insensitive to cavity decay,because atoms are interacting with a large detuning vacuum cavity field.
An experimentally feasible scheme for implementing teleportation of multi-atom cat-like states in cavity QED is proposed. In the scheme the atoms interact simultaneously with a highly detuned cavity mode and are driven by a strong classical field, and the atomic state evolution is independent of cavity field state. Thus the scheme is insensitive to both the cavity decay and the thermal field, which is of importance from the experimental point of view. All the orthogonal and complete multi-atom GHZ states can be exactly distinguished only by one step, so our scheme can also be used for other purposes such as dense coding using multi-atom GHZ states as quantum channels.
We propose a feasible scheme for implementing probabilistic teleportation of an unknown atomic state. In this scheme, atom 1 is initially in an arbitrary state, atoms 2 and 3 are prepared in a partially entangled pure state. After receiving the result of Bell-state measurement performed by Alice on atoms 1 ant 2, Bob lets atoms 2 and auxiliary atom A simultaneously interact with a single-mode vacuum cavity. Only controlling the interact time, we can reconstruct the initial state of atom 1 on the atom 3, i.e. double of square of mode of smaller coefficient of superposition state serving as quantum channel. Moreover, our scheme is insensitive to cavity decay, because atoms are interacting with a large detuning vacuum cavity field.
We present two schemes for probabilistically teleporting a two-atom entangled state using a three-atom partially entangled state as the quantum channel in cavity QED with the help of separate atomic measurements. The first scheme is only based on the interaction between two driven atoms and a quantized cavity mode in the large detuning limit, so the effects of both cavity decay and the thermal field are eliminated. In the second scheme, it is necessary to introduce an additional resonant cavity besides the thermal cavity to realize the teleportation, and the corresponding success probability is improved.
Two schemes for controlled probabilistic teleportation of three-particle three-dimension cat-like state are proposed.In the first scheme,a partial five-particle qutrit entangled state is used as the quantum channel,while in the second scheme,two partial two-particle qutrit entangled states and a partial entangled three-particle qutrit state are used as the quantum channel.The classical communication cost required in both schemes is difference.The successful probability of the two schemes is difference either.
A scheme is proposed for the teleportation of atomic states within cavities. The scheme is insensitive to the cavity field states and cavity decay. The teleportation may be achieved in a simple way. We show how the idea can be used to generate multiatom entangled states. In order to entangle n atoms, we require $n\ensuremath{-}1$ cavities and allow the first cavity to exchange energy with the environment. The other $n\ensuremath{-}2$ cavities are always in the vacuum state and thus the cavity decay is suppressed.