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ACTA PHOTONICA SINICA

Generation of n-Atom GHZ State via Two-sided Cavity QED

Faqiang Wang

Published Jan 1, 2009• 0 citations
OpenAlex

Abstract

The scheme was proposed to generate multiple-atom GHZ state via the state-of-the-art two-sided cavities.A single-photon pulse could not only be reflected but also be transmitted through the two-sided cavity with a single trapped atom,which is in certain state.Entanglement between the trapped atom and the input field was resulted in this property.The numerical simulations showed that the produced multiple-particle GHZ state had high fidelity and success probability.The intrinsic noise,such as the atomic spontaneous emission,only led to the error probability and had no influence on the fidelity.In addition,the high-Q cavity and the Lamb-Dicke condition of atom were not required,which expanded the possibility of experimental realization.

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Communications in Theoretical Physics•Sep 1, 2010•1 citation
The scheme was proposed to generate multiple-atom GHZ state via the state-of-the-art two-sided cavities.A single-photon pulse could not only be reflected but also be transmitted through the two-sided cavity with a single trapped atom,which is in certain state.Entanglement between the trapped atom and the input field was resulted in this property.The numerical simulations showed that the produced multiple-particle GHZ state had high fidelity and success probability.The intrinsic noise,such as the atomic spontaneous emission,only led to the error probability and had no influence on the fidelity.In addition,the high-Q cavity and the Lamb-Dicke condition of atom were not required,which expanded the possibility of experimental realization.
We propose schemes to prepare n-atom Greenberger–Horne–Zeilinger (GHZ) state via two-sided cavities interacting with single-photon pulses, and achieve quantum state transfer (QST) from one atom to another atom. Entanglement particle pair and the control of coupling between qubits are of no need in the QST process. Some practical quantum noises only decrease the success probabilities of the schemes but have no influence on the fidelity of prepared state. In addition, the success probabilities of our schemes are close to unity in the ideal case.
This paper proposes schemes for generating multiple-photon and multiple-atom cluster states, respectively. The schemes are based on the cavity input-output process and atomic or photonic states measurement, and the successful probabilities approach unity in the ideal case. The numerical simulations show that the produced multiple-particle cluster states have high fidelity even if the Lamb–Dicke condition is not satisfied. Some practical imperfections, such as atomic spontaneous emission and output coupling inefficiency, only decrease the success probability but exert no influence on the fidelity of generated multiple-particle cluster states. From the experimental point of view, smaller operation number and lack of need for individual addressing keeps the schemes easy to implement. These schemes may offer a promising approach to the generation of a large-scale cluster state.
A scheme is proposed to generate W state of N atoms trapped in a cavity, based on adiabatic passage along dark state. Taking advantage of adiabatic passage, the atoms have no probability of being excited and thus the atomic spontaneous emission is suppressed. The scheme is simple. It does not need to adjust the interaction time accurately, and does not need to prepare the cavity field in one-photon state. Numerical simulation shows that the successful probability of the scheme increases with the increasing of the atom number.