【量子光学】 Quantum Optics 2 Quiz 3.7(7)

Quantum Optics 2课程第七次测验

第1题 (不定项选择)

What will happen for the interferometer if one works around a dephasing $\delta$ equals 0 instead of $\frac{\pi}{2}$ ?

A) The interferometer will be poorly sensitive to variation in the difference between the arms lengths.

B) The interferometer will not be able to distinguish between a positive and a negative variation in the difference between the arms lengths.

第2题 (不定项选择)

When considering as input state $\left|\psi\right\rangle_{in}=\left|0\right\rangle_1\otimes\left|\alpha\right\rangle_2$ with $\alpha\gg1$, for which calculation(s) does it really matter to take into account the operators $\hat{a}_1$ and $\hat{a}^\dagger_1$ ?

A) The average signal $\left\langle\hat{N}_6-\hat{N}_5\right\rangle$.

B) The standard deviation $\left\langle(\hat{N}_6-\hat{N}_5)^2\right\rangle$.

第3题 (不定项选择)

When considering as input state $\left|\psi\right\rangle_{in}=\left|0, R\right\rangle_1\otimes\left|\alpha\right\rangle_2$ with $\alpha\gg1$, for which calculation(s) does it really matter to take into account the operators $\hat{a}_1$ and $\hat{a}^\dagger_1$ ?

A) The average signal $\left\langle\hat{N}_6-\hat{N}_5\right\rangle$.

B) The standard deviation $\left\langle(\hat{N}_6-\hat{N}_5)^2\right\rangle$.

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