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Chinese Physics Letters

High-Frequency Einstein-Podolsky-Rosen Entanglement via Atomic Memory Effects in Four-Wave Mixing

Xuehua Zhang, 胡响明, 孔令峰, 张秀

Published Jan 1, 2010• 0 citations
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Abstract

当原子松驰时间比洞松驰时间长比得上或时，原子记忆效果发生。我们证明由使用存储器效果，获得在一双 Stokes 和反之间的高周波的 Einstein-Podolsky-Rosen 纠纷是可能的 -- 司烧在一个四波浪的混合系统的域。物理起源由于参量地放大的地被跟踪到处理状态的动态空 splittings。这机制为边带纠纷提供一个其他、有效的方法。[从作者抽象]

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当原子松驰时间比洞松驰时间长比得上或时，原子记忆效果发生。我们证明由使用存储器效果，获得在一双 Stokes 和反之间的高周波的 Einstein-Podolsky-Rosen 纠纷是可能的 -- 司烧在一个四波浪的混合系统的域。物理起源由于参量地放大的地被跟踪到处理状态的动态空 splittings。这机制为边带纠纷提供一个其他、有效的方法。[从作者抽象]
我们证明产生纠缠的 Einstein-Podolsky-Rosen (EPR ) 是可能的用一座原子水库的放射由协调人口套住控制了。三水平的原子的一根横梁开始在套住的在协调附近的人口(CPT ) 被准备状态和行为作为一座长寿控制连贯的水库。四波浪的混合导致与原子偶极子转变的 Rabi 边带反响的洞模式的扩大。洞模式演变为一个 EPR 状态，其纠纷的度被紧张和开车的频率控制，回答。这个计划使用长寿 CPT 连贯并且对原子横梁的自发的排放是柔韧的。同时，这个计划在一个一步舞过程，不是在在 Phys 被要求的一个二拍子的圆舞过程被实现。加快。Lett。98 (2007 ) 240401。[从作者抽象]
Atomic memory effects occur when the atomic relaxation times are comparable to or much longer than the cavity relaxation times. We show that by using the memory effects, it is possible to obtain high-frequency Einstein–Podolsky–Rosen entanglement between a pair of Stokes and anti-Stokes fields in a four-wave mixing system. The physical origin is traced to the dynamical Stark splittings of dressed states due to the parametrically amplified fields. This mechanism provides an alternative and efficient way for sideband entanglement.
We report the direct characterization of energy-time entanglement of narrow-band biphotons produced from spontaneous four-wave mixing in cold atoms. The Stokes and anti-Stokes two-photon temporal correlation is measured by single-photon counters with nanosecond temporal resolution, and their joint spectrum is determined by using a narrow linewidth optical cavity. The energy-time entanglement is verified by the joint frequency-time uncertainty product of 0.063±0.0044, which does not only violate the separability criterion but also satisfies the continuous variable Einstein-Podolsky-Rosen steering inequality.