A parametric amplifier is in essence a linear four-port device, which couples and linearly mixes two inputs before amplifying and sending them to two output ports. Here we show that for quadrature-phase amplitudes, a parametric amplifier can replace beam splitters to play the role of the mixer. We apply this idea to a continuous-variable quantum state teleportation scheme in which a parametric amplifier replaces a beam splitter in the Bell measurement. We show that this scheme is loss tolerant in the Bell measurement process and thus demonstrate the advantage of the parametric amplifier over the beam splitter in the applications in quantum measurement.

中文翻译：

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参量放大器，用于贝尔测量连续变量量子态隐形传态

从本质上讲，参数放大器是线性四端口设备，该设备在放大并发送到两个输出端口之前先将其耦合并线性混合两个输入。在这里，我们显示出对于正交相位振幅，参数放大器可以代替分束器来发挥混频器的作用。我们将此思想应用于连续可变量子态隐形传态方案，在该方案中，参数放大器代替贝尔测量中的分束器。我们证明了该方案在Bell测量过程中具有损耗容限，因此证明了在量子测量应用中参数放大器优于分束器的优势。