I have a background in QM 1, Stat mech, Non Equilibrium Stat Mech. If you could recommend resources regarding this it would be really helpful. I wanna learn about density matricies too.

is this a correct explanation for why light is reflected at an angle? The geometry of the drawing is inaccurate.

https://preview.redd.it/jf17zp4shy0d1.jpg?width=950&format=pjpg&auto=webp&s=50fe18f372fcb41c177693fdb25cdf57f3080412

Looking for anyone else working through the book and lectures - mainly looking for help and discussion of the problems and homework.

Hi

I've been diving into the world of quantum mechanics recently , but the more I learn the more questions I get

One of those things that I could not get my head wrapped around was spin , what exactly is spin ?

Hey all - I just made this video on quantum enabled supercomputers. I hope y’all find it interesting!

Feel free to share any advice as well :)

The First Quantum Super Computer https://youtu.be/h7y2Wnk6oZA

Focus on Quantum Computing and how it impacts future large AI model training

https://youtu.be/ZDijVuRBtWM?si=yND6jGhtz10zbIfD

i have package only for apple laptops and Linux

Hi everyone,
I've been accepted into MQST at TUM and QUANTEEM Erasmus for a masters in quantum technology. MQST has no tuition but lacks funding; I'll need to work part-time. QUANTEEM Erasmus offers a diverse European experience. Any insights on which to choose?
I ultimately wanna work in IBM or any other mainstream company.
Thanks!

At one point in Thomson's book "Modern Particle Physics", in the section on non-relativistic quantum mechanics (on page ~40), we write the following thing:

H^ = p^(^sqrt)/2m + V^ = - (1/2m) ∇² + V^

Why do we write that the "standard" Hamiltonian operator without projection in a basis H^ = p^(^sqrt)/2m + V^ is equal to the Hamiltonian operator when we place ourselves in the basis of continuous representation of the space of positions { | x > } which is:

H^ = - (1/2m) ∇² + V^

Where ∇² takes into consideration { | x > }

I asked someone on Discord and he didn't know how rigorous it was to write this equality. Can someone enlighten me please?

I’ve been working on depicting quantum mechanics with 2d animation. Abstracting the behavior from math to visuals has proven to be somewhat difficult, if anyone here has recommendations on how best to do this that would be most helpful. I’m aware no visuals will ever be able to accurately depict the action, and will always be fundamentally inaccurate, I simply wish to avoid the pitfalls I’ve seen a lot of the visuals commonly used run into.

(Im aware there was no space or time before hand, the actual time scales at play, and that vacuum fluctuations aren’t really (virtual particles) but more a mathematical abstraction) this was mostly for fun and is a segment of a larger project involving simplifying large concepts into an abstract video.

I am going to be starting my PhD in the fall in a quantum science and engineering program. I have worked with superconducting qubits throughout my undergrad and really liked the work. I wanted to pursue a PhD related to quantum hardware because I felt like I could have an impactful career in quantum technology.

However, I did more research on the current status of the field recently and found a lot of skeptics, often people who are working in the field or well-known quantum physicists. A lot of them think that the field of quantum technologies has been severely overhyped, and that a “quantum winter” is coming where funding will eventually dry out and a lot of people will get stuck in a dead field. Even if we do have fault-tolerant quantum devices, they wouldn’t really impact anything much.

Given this, did I make a big mistake by choosing a PhD that specializes in quantum hardware? My specific track is called “quantum nanotechnology”, and I will be doing experimental work with photonics and quantum dots. It is a very industry focused program, but now I’m worried that by the time I finish my PhD most of the quantum market might be gone.

Any opinion and advice is highly appreciated.

recently i'm start to explore quantum logics as I'm programmer that I was want to understand what is 'probabilty', so which kind of youtube channel I should take start to get into of quantum world?

Tomorrow is my last day at college and my last day to use a printer for free. What are the most important papers on Tensor Networks and their quantum applications? Think Roman Orus, Schollwock, etc type lane

Recently I was in a discussion which left me curious, unfortunately I am unable to ask the person I was talking to as it appears I was blocked.

I was making the argument that in some situations space and time can be interchangeable, specifically referencing a time based double slit experiment and the spin of positrons, as examples where you can functionally swap space and time.

Here is the temporal double slit where instead of using spacing slits timing was used https://www.nature.com/articles/s41567-023-01993-w

And here’s the math relating to positrons https://www.askamathematician.com/2016/11/q-does-anti-matter-really-move-backward-through-time/

I’m aware there are functional arguments against this model for antimatter relating to mass, and that it’s more an abstraction of behavior than actual time travel. The backwards temporal nature was poorly presented as just being fact in many textbook diagrams.

I was told I was massively misunderstanding the information, which is fair, so since I can’t ask that person specifically I figured I would turn here. I would very much like to know what exactly I’ve gotten wrong. If this double slit experiment isn’t an example of being able to swap the variables of space and time, what is it?

If a particle travels a distance d while tunneling, does it take d/c seconds for the particles information to appear on the opposite side of the barrier? Or can it tunnel through the barrier faster than it would take to transit the distance d at c if no barrier existed?

Hello!

I'm currently working on a Quantum Physics course project and I need to write a lab report on some quantum algorithm. I am required to use a real 2 or 3 qubit quantum computer to do the experiment and explain my results. I chose to do mine on the CHSH game.

I followed this blog post "CHSH Game And Step by Step Explanation Of The Qiskit Code" by Waliur_Sun and replicated the quantum circuit given accordingly on the quantum computer. However, my results are not what I expected. Ignoring the experimental results (the professor said that perhaps there was a calibration error? honestly idek anymore), even the simulated results are not what I expected?

Here's my understanding, for (x,y) = (0,0) or (0,1) or (1,0), the output (a,b) should be identical (a = b) right? And if (x,y) = (1,1), the output should be different ( a /= b). What's wrong? Can someone explain this to me and tell me how to design the quantum circuit so I will get the results I need?

I am a high school senior, just finished my college application. I got into colleges listed in the title. (most are ECE major). Quite interested in quantum information/engineering. Wondering which college has better resource and courses for QC. Any suggestions?