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arXiv 0907.3413cond-mat.quant-gas
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旋量凝聚体中真空涨落的参量放大

Parametric amplification of vacuum fluctuations in a spinor condensate

C. Klempt, O. Topic, G. Gebreyesus, M. Scherer, T. Henninger, P. Hyllus, W. Ertmer, L. Santos, J. J. Arlt

摘要:

真空涨落的参量放大在现代量子光学中至关重要,它使压缩和纠缠的产生成为可能。我们用旋量F=2的Rb-87凝聚体证明了物质波真空涨落的参量放大。原子间相互作用导致从初始不稳定的mF =0凝聚态产生mF = +/- 1态的关联对,当mF不等于0时,该凝聚态充当真空。虽然这种从纯mF =0凝聚态产生对的过程在理想情况下是由真空涨落触发的,但不可避免的mF = +/-1初始原子诱导了一个经典种子,这可能成为主要的触发机制。我们发现,对创建是不敏感的经典种子足够大的磁场,展示了真空波动的主导作用。因此,所提出的系统提供了一个直接的路径上的旋量凝聚的基础上产生的非经典状态的物质。

英文摘要:

Parametric amplification of vacuum fluctuations is crucial in modern quantum optics, enabling the creation of squeezing and entanglement. We demonstrate the parametric amplification of vacuum fluctuations for matter waves using a spinor F=2 Rb-87 condensate. Interatomic interactions lead to correlated pair creation in the m_F= +/- 1 states from an initial unstable m_F=0 condensate, which acts as a vacuum for m_F unequal 0. Although this pair creation from a pure m_F=0 condensate is ideally triggered by vacuum fluctuations, unavoidable spurious initial m_F= +/- 1 atoms induce a classical seed which may become the dominant triggering mechanism. We show that pair creation is insensitive to a classical seed for sufficiently large magnetic fields, demonstrating the dominant role of vacuum fluctuations. The presented system thus provides a direct path towards the generation of non-classical states of matter on the basis of spinor condensates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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