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Communications in Theoretical Physics

Deterministic Generation of Quantum State Transfer Between Spatially Separated Single Molecule Magnets

Peijun Song, Xin‐You Lü, Pei Huang, Xiangying Hao, Xiaoxue Yang

Published Aug 1, 2010• 2 citations
Publisher

Abstract

We propose a new scheme for realizing deterministic quantum state transfer (QST) between two spatially separated single molecule magnets (SMMs) with the framework of cavity quantum electrodynamics (QED). In the present scheme, two SMMs are trapped in two spatially separated optical cavities coupled by an optical fiber. Through strictly numerically simulating, we demonstrate that our scheme is robust with respect to the SMMs' spontaneous decay and fiber loss under the conditions of dispersive SMMs-field interaction and strong coupling of cavity fiber. In addition, we also discuss the influence of photon leakage out of cavities and show that our proposal is good enough to demonstrate the generation of QST with high fidelity utilizing the current experimental technology. The present investigation provides research opportunities for realizing QST between solid-state qubits and may result in a substantial impact on the progress of solid-state-based quantum communications network.

DOI
10.1088/0253-6102/54/2/15

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We propose a scheme for deterministically generating entanglement between two distant microwave cavities that interact with two single-molecule magnets (SMMs) and are connected by an optical fiber. In our scheme, the spontaneous decay of SMMs and photons damping in the fiber are efficiently suppressed via employing the stimulated Raman adiabatic passage (STIRAP). To check the experimental feasibility of our scheme, we numerically simulated the effects of some deviations of experimental parameters, and the numerical simulation shows that our scheme is robust with respect to those experimental parameters. We also discuss the effects of cavity damping, and as a result our proposal is good enough to demonstrate the generation of entanglement of microwave cavities within current experimental technology.
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Based on the dispersive atom–field interaction, a scheme is proposed for deterministically generating entanglement between two Λ-type atoms, which are trapped individually in two spatially separated cavities coupled by an optical fibre. In the present scheme, it is found that the atomic spontaneous decay and photon leakage out of the fibre can be efficiently suppressed via choosing appropriately the frequency detuning of atom–field and the coupling intensity of cavity–fibre, respectively. The influence of photon leakage out of the cavities is also discussed, and the strictly numerical simulation shows that our proposal is good enough to demonstrate the generation of entanglement between two distant atoms with high fidelity.
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