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International Conference on Systems and Informatics (ICSAI)

A scheme for remotely preparing a two-atom entangled state in cavity quantum electrodynamics system

Junfang Xiao, Yuan Ren

Published Nov 1, 2014• 0 citations
Publisher

Abstract

In this paper, a physical scheme for remotely preparing a diatomic entangled state via a two-atom entangled state and a triatomical entangled W state is presented by applying the cavity quantum electrodynamics technique. The original state can be transmitted to either one of the receivers by introducing a auxiliary cavity. Two different kinds of atom-cavity interactions are utilized at the sender's and the receiver's site, respectively. The total success probability for each receiver is obtained, which will be equal in certain condition.

DOI
10.1109/icsai.2014.7009369

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A scheme for remote preparation of a two-atom entangled state is presented, which is based on the simultaneous nonresonant interaction of atoms with a single-mode cavity field. In view of the fact that two-particle entanglement is more easily generated than three-particle entanglement, the scheme prepares a two-atom entangled state via two pairs of two-atom entangled state as the quantum channel. Let two identical atoms Alice possesses interact with a single-mode cavity field simultaneously. Alice knows the state she wants to prepare. She selects a proper interaction time, measures the states of the atoms she possesses, and informs Bob of her measurement through a classical channel. Bob introduces an identical auxiliary atom and a single-mode cavity field in vacuum state to achieve the scheme. The scheme is insensitive to the cavity field states and cavity decay. The preparation can be achieved in a simple way. Based on current cavity quantum electrodynamics technique, the scheme can be realized experimentally.
A physical protocol for joint preparing a single atomic qubit state remotely in context of the atom system from spatially separated two senders and one receiver is proposed. A triatomic entangled W type state is worked as the quantum channel, and the control of the state of a single two-level atom can be achieved by the interaction of the atom and the classical field. It shows that the JRSP of an atomic single-qubit can be success in a probabilistic manner in certain condition that the classical information of the single-qubit state is split in some proper ways.
A scheme for remote preparation of field (atomic) states is proposed. Protocol execution requires cavity QED based atom-field interactions successively supplemented with Ramsey interferometry. The state to be remotely prepared at the receiver's end is acquired by deterministically manipulating the sender's component of the pre-shared entangled state. In the case of field entanglement, it is carried out with the help of an atom that passes through the sender's cavity and then traverses a classical external field for specified times prior to detection. However, for atomic entangled states, only interactions with the classical field suffice to complete the task. The scheme guarantees good success probability with high fidelity and requires one bit of classical communication.
In this paper, a scheme is proposed for remote state preparation (RSP) with cavity quantum electrodynamics (QED). In our scheme, two observers share two-atom nonmaximally entangled state as quantum channels and can realize remote preparation of state of an atom. We also propose a generalization for remote preparation of N -atom entangled state by ( N +1)-atom GHZ-like state ( N ≥ 2). By this scheme, one single-atom projective measurement is enough for the RSP of a qubit or N -atom entangled state, and the probability of success for RSP is unity. Furthermore, we have considered the case where observers use W-like state as quantum channels to realize RSP of a qubit. We compare our scheme with existing ones.
We propose a scheme to remotely prepare a general two-particle entangled state by using a bipartite entangled state and a tripartite entangled W state as the quantum channel. Our scheme consists of one sender and two remote receivers. The sender can help either one of the receivers to remotely reconstruct the original state with the assistance of the other receiver's single-particle orthogonal measurement. We obtain the total success probability and discuss the classical communication cost in our remote state preparation scheme.