Physics Lecture:- Double Slit IV: Quantum Eraser: Home Version

This video is a part of the "Physics-X" lecture series, taught at Michigan Technological University by Dr. Robert Nemiroff. Dr.Nemiroff is one of the co-creators of the popular website APOD (Astronomy Picture of the Day).

"Physics-X" deals with some of the most extraordinary concepts in physics, most of which try to provide the Physics background behind some cool phenomena and theories like Time Travel, Special Relativity, Worm Holes and Black Holes, Quantum Mechanics, Parallel Universes, etc.

No textbook and no prior knowledge of rigorous mathematics, is required for the course.

In this fourth part of the Double Slit Experiments lecture series, Dr.Nemiroff discusses how you can set up your own double slit experiment, in the comfort of your own home, with readily available objects.

Will you be the first to crack the secrets to Double slit experiments?

Category:

Science & Technology

Tags:

• APOD
• Nemiroff
• Physics X
• Double slit experiments
• Quantum effects
• Decoherence
• Quantum Eavesdropping
• Quantum eraser
• Delayed Choice

[rmtglass1]

Awesome

[itsadeadmansparty]

This Professor Absolutely Rocks! 

[glasotnaroda1]

i think i may understand this experiment and it can be modified so you possibly....OMG. i am sorry i m not gonna tell you directly. eeeerh is there someone else that came up with the same idea i dont want to disclose in public (if you had the same idea uwill know)

[gyro5d]

The 3rd polarizer is like inserting a continual 2 slit experiment. There was an experiment saying ab=bc=ca, continual 2 slit experiment.

[zadeh79]

Somebody should put together high quality versions of this , and sell them.

[kevinstuartfr0st]

young's double slit experiment like you've never seen before

watch?v=yNeHYhvQXic

[beardedbroccoli]

Was this made in the 80's? lol

[7j8i9m]

@upublic Simple, and elegant. Which way would reflected light go? It would fan out in a roughly 180 degree pattern, toward you. None of the reflected light goes on to the wall.

[7j8i9m]

@LordDavidVader In short, exactly. When he says he's erasing the "which-way" information, he means it's impossible to tell which slit the photon came though. One way to do that is to mix the two different sources of light, resulting in the classic interference pattern. But the basic truth still holds- if you know which slit the particles came through, they form the classic pattern. If you cannot tell which slit they came though, they form an interference pattern.

[LordDavidVader]

I am trying, and failing, to wrap my head around this. How do we arrive at the conclusion that the 3rd diagonal filter is removing the "which way" information. It seems to me that it simply allows light from both slits to reach the detector which we would expect to then result an interference pattern. Similarly when it is vertical so it blocks light from one slit we don't get the pattern which seems to me just the same as blocking one slit.