【量子光学】 Quantum Optics 2 Quiz 5.4(14)

Quantum Optics 2课程第十四次测验

第1题 (不定项选择)

We assume that the setup has been adapted to be able to detect the Bell state $\left|\Phi^-\right\rangle$. Which entangled state between photons $\nu_1$ and $\nu_2$ is better suited to realize quantum teleportation?

A) $\frac{1}{\sqrt{2}}(\left|x_1,x_2\right\rangle+\left|y_1,y_2\right\rangle)$

B) $\frac{1}{\sqrt{2}}(\left|x_1,x_2\right\rangle-\left|y_1,y_2\right\rangle)$

C) $\frac{1}{\sqrt{2}}(\left|x_1,y_2\right\rangle+\left|y_1,x_2\right\rangle)$

D) $\frac{1}{\sqrt{2}}(\left|x_1,y_2\right\rangle-\left|y_1,x_2\right\rangle)$

第2题 (单选)

Assuming that we improve the setup to detect both $\left|\Phi^+\right\rangle$ and $\left|\Psi^+\right\rangle$, what should be the effect of the device V when $\left|\Psi^+\right\rangle$ is detected, in order to optimize the quantum teleportation protocol?

A) V remains close.

B) V acts as a half waveplate with eigenaxes at 45° angle from $\left|x_2\right\rangle$ and $\left|y_2\right\rangle$.

C) V acts as a quarter waveplate with eigenaxes aligned with $\left|x_2\right\rangle$ and $\left|y_2\right\rangle$.

D) V remains open.

第3题 (单选)

What is the role of a quantum memory in a quantum teleportation scheme?

A) It stores the quantum state of a photon during a finite duration, and reemit a photon in the exact same quantum state.

B) It remembers for ever the quantum state of a photon.

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