论文标题
相位敏感放大器的噪声图的广义表达，用于任意数量的模式
Generalised expression of the noise figure of phase sensitive amplifiers for an arbitrary number of modes
论文作者
论文摘要
相反的相敏感放大器（PSA）与通常的相位不敏感放大器（PIA）相反，原则上能够实现无噪声放大，即表现出0 db的量子限制噪声图（NF）。当在非线性纤维中使用四波混合（FWM）实施时，可以通过不希望的FWM工艺产生额外的波，这可能会引入额外的输入端口以进行真空波动，从而可能降低NF。在这种情况下，我们在此给出了PSA NF的一般分析量子推导，对任意数量的非线耦合模式有效。只要可以找到涉及模式的an灭和创建操作员，就可以找到线性输入输出关系后立即使用。它预测噪声水平取决于相互作用波的数量。我们说明了在六个波的情况下，该表达的有用性，对应于四种相互作用的量子模式。在此示例中，信号NF被0.4 dB降解，而同一方案的PIA操作获得了10 dB。
Phase sensitive amplifiers (PSA), contrary to usual phase insensitive amplifiers (PIA), are in principle capable to achieve noiseless amplification, i.e. exhibit a quantum-limited noise figure (NF) of 0 dB. When implemented using four-wave mixing (FWM) in a nonlinear fiber, extra waves can be generated by undesired FWM processes, which may introduce extra input ports for vacuum fluctuations, thus potentially degrading the NF. In this situation, we give here a general analytical quantum derivation of the PSA NF, valid for an arbitrary number of nonlinearly coupled modes. This expression is usable as soon as a linear input-output relation can be found for the annihilation and creation operators of the involved modes. It predicts that the noise level depends on the number of interacting waves. We illustrate the usefulness of this expression in the case of six waves, corresponding to four interacting quantum modes. In this example the signal NF is degraded by 0.4 dB, compared to 10 dB obtained for PIA operation of the same scheme.
