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Journal of Henan Normal University

Teleportation of Multi-qubit One-photon Cavity-field and Vacuum State by Multi-atom Detection

WU Shen-shan

Published Jan 1, 2006• 0 citations
OpenAlex

Abstract

A scheme for teleporting one or many bits of cavity-field states is proposed.The each cavity-field state consists of vacuum and one-photon.In this paper,we find a detection method for distinguish the Four Bell cavity-field states.It lets atoms interact resonantly and nonresonantly with cavity field in order to realize a non-demolition measurement and read out the cavity-field Bell states via measuring the atomic states.

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A scheme for teleporting one or many bits of cavity-field states is proposed.The each cavity-field state consists of vacuum and one-photon.In this paper,we find a detection method for distinguish the Four Bell cavity-field states.It lets atoms interact resonantly and nonresonantly with cavity field in order to realize a non-demolition measurement and read out the cavity-field Bell states via measuring the atomic states.
We present a scheme of atomic-state teleportation by using a quantum switch (QS). Based on the principle of QS and the quantum interference effect, a controlled-NOT operation between atom and cavity is proposed and used to transform the joint measurement of the von Neumann type into the discrete measurements. A detection method using several atoms resonantly interacting with field state is also presented to read out the field state in a cavity. The fidelity due to cavity dissipation is discussed. In our scheme, since the transfer of quantum information between atom and cavity is achieved by nonresonant atom-cavity interaction, three-bit classical information is transmitted from Alice to Bob to complete teleportation.
We present a scheme in which the N-atom W state is teleported by employing the selective interaction of a cavity field with a driven three-level atom in the A configuration and detecting a single atom in one of the ground states. The long-lived W state is teleported from atom A to atom B when the atoms B and A are sent through a cavity successively and atom A is then detected. The advantage is that the present one does not involve the Bell-state measurement and is robust against the atomic spontaneous emission.
A scheme is proposed to teleportation of an unknown multi-atom entangled state, considering the entangled states of two or more particles play an important role in both demonstrating quantum nonlocality and quantum information processing. The scheme is based on the degenerate Raman interaction of a Λ-type three-level atom with a single-mode field. First let n atoms cross a coherent cavity field in succession to prepare a quantum channel. Then the sender lets the other n atoms which carry the unknown state cross the cavity in succession and makes a joint measurement by detecting the cavity field and the atoms separately. When ｜α｜1, the cavity field can be detected with the measurement method of detecting orthogonal states. Finally the receiver reconstructs the initial state according to the outcome of the joint measurement transmitted through a classical channel. The advantage of the scheme is that it uses an entangled state of a coherent state with n atoms as a quantum channel, which makes the scheme simple and easy. The scheme is expected to be useful in demonstrating quantum nonlocality and information processing.
We present an alternative and experimentally feasible scheme to realize the teleportation of a cavity mode in a coherent superposition of zero-, one-, and two-photon field states. Particular nonmaximally entangled states of two-level atoms and particular cavity modes are employed and their preparation is discussed. A Ramsey-type arrangement, together with pointer atoms, is required to prepare the atomic entangled states as well as to read out the cavity system. Basically, the pointer atoms induce the state-vector collapse of the field in the cavity system and indicate, through their detection, the measurement result. \textcopyright{} 1996 The American Physical Society.