The Michelson interferometer uses the partial amplitude method to generate double beams to achieve interference, which has a certain position in modern physics.

Shen Qi is doing this experiment, which is one of several basic physics experiments.

Transfer the beam expander outside the Mike's optical path, adjust the helium-neon laser bracket, match the light target to make the light beam parallel to the table of the instrument, and control the distance between the incident and exit points of each optical mirror to the table of about 70mm... Shen Qi strictly follows the experimental operation process. This basic optical experiment of modern physics is not difficult, and it tests patience and carefulness.

After recording the original data, Shen Qi quickly calculated the laser wavelength and air refractive index and handed the recording paper manuscript to an experimental teaching assistant in the Academy of Physical Education.

The young experimental teaching assistant checked Shen Qi's recording paper and nodded: "Okay, there's no problem."

"Senior brother, are you responsible for the comprehensive design experiment?" Shen Qi asked.

"Yes, Teacher Ren has already explained it." The experimental teaching assistant seems to respect Professor Ren very much. He is a graduate student with excellent character and academic performance in the School of Physical Education.

"Where is the research on innovative experiments?" Shen Qi asked again.

The experiment assistant teacher smiled and said, "I'm still responsible. In short, you can just contact me for undergraduate experiments."

"Thank you, brother, by the way, what do you call me?" Shen Qixin said that Mr. Ren is quite energetic and completed my physical experiment arrangement in minutes.

"My name is Qin Hao, now I am a graduate student." The experimental assistant said, and then asked humbly: "Shen Qi, let me ask you something, how to operate Princeton's interview?"

"It's very simple. Just just have a blowjob with the foreign interviewer. The interview time is usually about 1 hour, speaking English in 45 minutes and speaking Chinese in 15 minutes."

"These foreigners are very good now, and they speak Chinese very well." Shen Qi said, imparting experience.

"Just blowing water? The interviewer does not examine academic issues?" Qin Hao asked again.

"Brother Hao, I don't know how others interview. I can only talk about my own interview experience."

"The American interviewer praised me at the beginning, saying that I had excellent paper data, and then asked me, hey, Shen, have you had any wonderful and special experiences?"

"I didn't have any wonderful and special experiences, so I recalled my past, from high school to sophomore year, and then a few days later, I received a offer from Princeton."

Shen Qi patiently told Qin Hao to help each other as much interview details as possible. The next two physics experiments have to rely on Qin Hao to coordinate: "So, Brother Hao also wants to go to Princeton?"

"I have this idea and want to go to Ivy League to study for a Ph.D.

"But it's too difficult to apply for Princeton. Maybe my goal should be Penn or Cornell."

Qin Hao said enviously: "You are still Shen Qi, you are awesome. You got the offer from Princeton in your sophomore year and the offer from Princeton's Department of Mathematics."

Shen Qi said: "The interview procedures of those schools in Ivy League are probably similar, mainly to test the applicant's oral expression ability."

"When communicating with the interviewer, you should avoid incoherent speech, inconsistent prefaces, and confusion in logic. What topics to communicate are not the focus, but the focus is confidence and calmness when communicating. Personal opinions are for reference only." At this time, Shen Qi was more like an experienced senior brother.

"Thank you for sharing!" Qin Hao said gratefully. He understood the written procedures for applying for an Ivy League school. He didn't know whether the online information was true or false.

The most reliable consultation channel is of course asking Shen Qi, who just participated in the Princeton interview and passed it successfully.

Under the arrangement of Professor Ren and under the specific coordination of Qin Hao, Shen Qi participated in the comprehensive design experiment of the art the next day.

In the same optical experiment, Shen Qi gave the experiment a nice name "Tirection between Photons" and listed the required experimental instrument list.

Unlike basic experiments with patterned fixed program operations, comprehensive design experiments require the experimenter to design the plan himself.

The experimental instruments Shen Qi applied for are very simple, one light source emitter, two detectors, several ordinary lenses, and one semi-transparent lens.

Under Qin Hao's supervision, Shen Qi began the "Tirection between Photons" experiment.

Shen Qi carefully adjusted the light source emitter, constantly reducing the power of the incident light until it finally emitted extremely faint light and allowed it to pass through the semi-transmitter.

A semi-transmitter is a special mirror where half of light can pass through and the other half is reflected.

The incident light is divided into two segments by the semi-lens, and then the ordinary lenses are used to change their travel routes separately, and finally arrive at the photon detector.

After the experiment has reached this step, it has actually entered the field of quantum mechanics. The problem to be solved is, what is light?

Newton believed that the essence of light is tiny particles that human eyes cannot see, but Huigens of the contemporary era believed that the essence of light is a kind of wave.

The two big bosses and their respective followers have quarreled for more than a hundred years but have not decided the outcome.

It was not until Thomas Young conducted the famous double-slit experiment that decisive evidence that light is a wave was obtained.

However, the debate continued. Soon after, Einstein stood up. He stood Newton and advocated that light is particle. The light quantum theory was born, and a new era of physics began.

Now everyone knows that light has wave-particle duality.

Volatility and particle nature are two extremely opposite characteristics. Just like the front and back of a coin, we can only see one side, but we cannot deny the existence of the other side.

When the fluctuation and particle nature of photons appear is like throwing a coin, opening five or five, completely random. The physical term is called quantum association, which is the theoretical basis for quantum code setting.

Quantum cryptography is more advanced than Virginia cryptography used to flirt with girls. The elective course in the Department of Mathematics "Cryptography" just briefly describes it. Shen Qi has a relatively shallow understanding of it, which is a very application-oriented field.

Shen Qi operates the experimental instrument and receives photons through two different detectors.

The photons received by the fluctuation detector are fluctuating, and the photons received by the particle detector are particle-like.

In fact, these photons come from the same weak light source. After being speculated by the semi-lens, the characteristics of the wave particle in the phase depend on the properties of the detector.

After the experiment was done here, Shen Qi could finish his work. He copied the "delay selection experiment" by contemporary physicist Wheeler, which completely proved the wave-particle duality of light.

Whether it is Einstein or Bohr, the quantum physics masters in the early 20th century put forward theoretical directions and opinions, but due to the experimental conditions at that time, they could not be perfectly proved through experimental data. Even the most basic quantum physics experimental instruments in the 21st century were also magical tools in Einstein and historians.

Shen Qi prefers to think that photons have twin properties. His experiment has not ended, so he uses twin photons to continue his experiments.

A twin photon is that two photons vibrate in the same direction, as if the photons and other photons in the distance undergo instantaneous information exchange through "telepathy".

"Brother Hao, my comprehensive design experiment has been over, and I can only do this. Research on high-speed quantum computers is beyond my ability." Shen Qi turned off the experimental instrument, signed the recording paper, and handed it over to Qin Hao.

"It's beyond my ability." Qin Hao took Shen Qi's experimental recording paper and signed a name. After that, he will report to the law school teacher and write a preliminary comment to Shen Qi as an experimental teaching assistant.

Shen Qi completed two physics experiments in two days, and the last one to study innovative experiments was left, which took some preparation time.
Chapter completed!