Classroom Aid - Quantum Eraser Experiment

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In this, the last chapter in the ‘How Small Is It’ video book, we’ll cover quantum superposition and quantum entanglement. We’ll also finish the work on the double slit experiment we covered in our first chapter on ‘The Microscopic’. We’ll be using electron spin and polarized light in most of our examples. Beginning with light, we’ll cover exactly how polarization works. Then we’ll use it to illustrate how we know which slit light went through in the double slit experiment. This illustration will highlight the nature of quantum linear superposition. As part of this we’ll take a look at Schrodinger’s Cat.
With superposition in hand, we’ll cover how these superposition states can become entangled across multiple particles. We’ll start with some classical behavior associated with water waves and spinning coins. Then, using electron spin, we’ll illustrate entanglement. We’ll follow that with Einstein’s problem with ‘spooky action at a distance’. We’ll cover several experiments both thought (from John Bell) and real as quantum physics progressed in its ability to manage the quantum world. We’ll see what a ‘ghost image’ is and how it was used to show Einstein was wrong. As part of this segment, we’ll cover the ‘Quantum Eraser’ experiment.

We’ll end with a look at Quantum Computers. Here we cover how electrons are controlled in such a way that they can be put into and taken out of a superposition state at will. And in addition, they can be managed into and out of entangled states. This ability enables quantum computing.}

Music:
@00:00 Bach - Flute Concerto in B Flat, Adagio; conducted by Eckart Haupt; from the album Meditation: Classical Relaxation, 2010
@13:21 Puccini - La Bohéme Act II- Musette Waltz; Sofia Philharmonic Orchestra; from the album 100 Must-Have Italian Opera Highlights, 2014
@26:50 Svendsen - Romance in G; Miklos Szenthelyi; from the album Meditation: Classical Relaxation, 2010

[princessspacetime]

thanks for covering the coincidence counting and generally just the exact step by step experiment, so much easier to understand WHAT is actually happening rather than simplifications that lead to odd interpretations - not to say i 100% understand as a non-physicist haha

[kostiantynkovalenko]

Thanks!! You explanation is the most reliable in all which I found about quantum eraser experiment.

[RealtermDe]

Great!
(Me too, a physicist, also had a normal job and now coming back to my passion.)

[LucaM]

Very well explained! One thing I would still like to understand is, why this fringe pattern emerges. I would have expected a regular blob just with a lower density...

[lidarman]

They should have called it the quantum selective viewing experiment.

[fastechx]

I have a question,
does the coincidence counter only counts when both split photon's signal reach the counter, or does it only counts signal who passes through double slits

[HakWilliams]

Thanks for debunking. This result is not well known yet.