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arXiv quant-ph/0403100quant-phcond-mat.mes-hall
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通过随机极限对$\Lambda$-原子的相干量子控制

Coherent quantum control of $Λ$-atoms through the stochastic limit

L. Accardi, S. V. Kozyrev, A. N. Pechen

AI总结:

本研究利用随机极限方法,探讨了与双激光场相互作用的$\Lambda$-型三能级原子的相干量子控制,证明该相互作用能将原子两低能级纠缠为单量子比特并使其指数级快速达到稳态叠加,且弛豫不必然导致退相干。

摘要:

我们使用随机极限方法,研究了与两个激光场相互作用的$\Lambda$-型三能级原子的相干量子控制。我们证明,在一般情况下,这种相互作用将原子的两个较低能级纠缠为一个单量子比特,即它以指数级快速率驱使原子达到一个稳态,该稳态是两个较低能级的相干叠加。通过向原子施加两个强度经过适当选择的激光场,原则上可以创建这两个能级的任意叠加。因此,弛豫不一定等同于退相干。

英文摘要:

We investigate, using the stochastic limit method, the coherent quantum control of a 3-level atom in $Λ$-configuration interacting with two laser fields. We prove that, in the generic situation, this interaction entangles the two lower energy levels of the atom into a single qubit, i.e. it drives at an exponentially fast rate the atom to a stationary state which is a coherent superposition of the two lower levels. By applying to the atom two laser fields with appropriately chosen intensities, one can create, in principle, any superposition of the two levels. Thus {\it relaxation} is not necessarily synonymous of {\it decoherence}.

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