【量子光学】 Quantum Optics 2 Quiz 2.5(4)

Quantum Optics 2课程第四次测验

第1题 (单选)

The amplification due to heterodyne detection is equal to $rt\sqrt{\frac{\Phi_2^{phot}}{\Phi_1^{phot}}}$.
For which reflection and transmission coefficients is the signal optimized?

A) $r=0, t=1$

B) $r=t=\frac{1}{\sqrt{2}}$

C) $r=t=\frac{1}{2}$

D) $r=\frac{1}{4}, t=\frac{\sqrt{3}}{4}$

第2题 (单选)

As shown in the lesson 2.5, the signal-to-noise ratio in heterodyne detection, assuming only shot-noise of the strong beam as source of noise, is given by $\left(\frac{S}{N}\right)_{het}=t\left(\frac{S}{N}\right)_{direct}$.
For which reflection and transmission coefficients would this signal-to-noise ratio be optimized?

A) $r=0, t=1$

B) $r=t=\frac{1}{\sqrt{2}}$

C) $r=1, t=0$

第3题 (单选)

Is this analysis to find the optimum signal-to-noise ratio correct?

A) Yes, it is.

B) No, it is not.

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