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arXiv:quant-ph/0504220

Network for transfer of an arbitrary $n$ -qubit atomic state via cavity QED

Zhanjun Zhang

Published Apr 29, 2005• 0 citations

Abstract

I show a scheme which allows a perfect transfer of an unknown single-qubit atomic state from one atom to another by letting two atoms interact simultaneously with a cavity QED. During the interaction between atom and cavity, the cavity is only virtually excited and accordingly the scheme is insensitive to the cavity field states and cavity decay. Based on this scheme, a network for transfer of an arbitrary single-qubit atomic state between atoms is engineered. Then the scheme is generalized to perfectly transfer an arbitrary 2-qubit atomic state and accordingly a network for transfer of an arbitrary 2-qubit atomic state is designed. At last, it is proven that the schemes can be generalized to an arbitrary $n(n\ge 3)$-qubit atomic state transfer case and a corresponding network is also proposed.

DOI: 10.48550/arxiv.quant-ph/0504220

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I show a scheme which allows a perfect transfer of an unknown single-qubit atomic state from one atom to another by letting two atoms interact simultaneously with a cavity QED. During the interaction between atom and cavity, the cavity is only virtually excited and accordingly the scheme is insensitive to the cavity field states and cavity decay. Based on this scheme, a network for transfer of an arbitrary single-qubit atomic state between atoms is engineered. Then the scheme is generalized to perfectly transfer an arbitrary 2-qubit atomic state and accordingly a network for transfer of an arbitrary 2-qubit atomic state is designed. At last, it is proven that the schemes can be generalized to an arbitrary

n(n\ge 3)

-qubit atomic state transfer case and a corresponding network is also proposed.

A scheme for the distant transfer of a qubit atomic state and atomic entangled states are presented.In the scheme,the identical two-level 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 and the requirement on the quality factor of the cavity is greatly loosened, which is of importance from the experimental point of view.

In this paper,we propose a scheme for transferring of a two-atom product state via cavity QED.This proposal is based on atomcavity field interaction with a large detuning and does not require the transfer of quantum information between the atoms and the cavity.Thus the scheme is insensitive to cavity field states and cavity decay.In addition,the scheme does not require Bell-state measurement and the transfer of the scheme can be achieved with 100% success probability in a simple manner.And the scheme can also be extended to transfer product state of n-atom.

In this paper, we propose a scheme for transferring an unknown atomic entangled state via cavity quantum electrodynamics (QED). This scheme, which has a successful probability of 100 percent, does not require Bell-state measurement and performing any operations to reconstruct an initial state. Meanwhile, the scheme only involves atom–field interaction with a large detuning and does not require the transfer of quantum information between the atoms and cavity. Thus the scheme is insensitive to the cavity field states and cavity decay. This scheme can also be extended to transferring an entangled state of n-atom.

We propose an entanglement swapping scheme in cavity QED.The different degree entanglement between atoms that never directly interacted can be realized,the unknown entanglement state can be transferred on atoms that never directly interacted.In the scheme,the previously used joint measurement is not needed.Only single measurement on atom is needed in realizing the swapping process.During the interaction between atom and cavity,the cavity is only virtually excited and thus the scheme is insensitive to the cavity field states and cavity decay.