Distribution of continuous-variable entanglement by separable Gaussian states

Distribution of continuous-variable entanglement by separable Gaussian states
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DOI:
10.1103/physreva.77.050302
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发表时间:
2008-04
期刊:
影响因子:
2.9
通讯作者:
Ladislav Mivsta;Jr.;N. Korolkova
Ladislav Mivsta;Jr.;N. Korolkova
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ladislav Mivsta;Jr.;N. Korolkova

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使用可分离的中介Ancilla在遥远的位置纠缠两个系统是T.Cubitt等人为量子比特提出的一种违反直觉的现象。[物理。莱特牧师。91、037902(2003年)]。我们证明了这样的纠缠分布对于高斯态是可能的,使用在实验中容易获得的某种三模完全可分离的混合高斯态和线性光学元件。通过在两个分束器上顺序地混合,两个态的模变得纠缠,而第三个态在协议的所有阶段中保持可分离。
Entangling two systems at distant locations using a separable mediating ancilla is a counterintuitive phenomenon proposed for qubits by T. Cubitt et al. [Phys. Rev. Lett. 91, 037902 (2003)]. We show that such entanglement distribution is possible with Gaussian states, using a certain three-mode fully separable mixed Gaussian state and linear optics elements readily available in experiments. Two modes of the state become entangled by sequentially mixing them on two beam splitters, while the third one remains separable in all stages of the protocol.