So I’m currently doing an introduction course about Particle and Nuclear Physics and today our professor introduced the Klein-Gordon equation as a generalization of the Schrödinger equation for bosons and derived the d’Alembert equation as a special case of the Klein-Gordon equation for massless particles. What irritates me about that is that on the internet you normally read that the Klein-Gordon equation would only apply to particles with spin zero, so not photons. Secondly he also derived the Yukawa potential as a solution of the K-G equation for pions, and that confuses me as well. Why is the solution of the KG equation equal to the potential which they induce? If the KG equation is a generalization of the Schrödinger equation, then I would have assumed that its solution is the wave function of the boson – just like the Schrödinger equation gives the wave function of the particle it is dealing with.

is quantum probablity basically the odds that every option is equally probable and thus occurring at all times, or is it that when we DO observe a probablity ratio, we can use that towards understanding the result of a collapse quantum wave?

Please explain like i know nothing(because i do know nothing)

Discover how integrating High-Performance Computing (HPC), Artificial Intelligence (AI), and Quantum technologies into a single, orchestratable platform is solving once-impossible challenges - from materials R&D to complex logistics.

November 19 at 10:00 CET, https://www.linkedin.com/events/thefutureofhybridcomputing-sove7521505999573245952/theater/

Hi everyone! I am a quantum algorithms researcher in a quantum computing company.

I created Quantum Matters: a learning platform for university-level physics and mathematics, building up to quantum mechanics. It teaches these subjects the way I wish they had been taught to me. After more than a year of work, Quantum Matters is now online and open for a public beta

The first chapter of the Linear Algebra course is available now. It is still a draft, but a presentable one, and the beta is mostly needed to validate the technology stack. If you don’t know linear algebra yet, you can already learn a good deal from it. I will release the next chapters over the coming weeks as I finish reviewing them. The full Linear Algebra course will remain free and open after launch.

If you try it, I would value your feedback on what works and what doesn’t.

• Website: https://quantum-matters.com

This material demonstrates how the differential equations of pure mathematics correspond to the geometric and physical reality of the three-dimensional hydrogen atom.
The mathematical derivations are expanded without omission to ensure accessibility for first- and second-year undergraduate students.

I am in my first semester of a Physics Master's in Europe (M1), getting ready to pick my Semester 2 electives (including Quantum Computing & Applications / Atomic & Condensed Matter) and my M1 research internship.

Sorry if this is too many questions at once, I just want to get an honest picture of the day-to-day work from people currently in the field:

What does 80% of your actual week look like in quantum computing/optics research? If you are in theory/algorithms, is it mostly pen-and-paper math, tensor networks, or fighting Python/Qiskit simulations? If you are in experiment, how much of your life is spent on cryogenics, electronics, and optical alignment vs physics?

With all the hype around quantum right now, how hard is it for a Master's or PhD student to find open, tractable problems that actually feel fundamental and impactful?

How strong is the bridge between Quantum Information, Many-Body Statistical Physics, and Machine Learning (e.g., neural quantum states, quantum control, or error correction)? Is that a good route for someone who likes both quantum mechanics and complex/statistical systems?

How does working in a small academic quantum group compare to industry R&D labs in terms of autonomy and owning your own project?

What is the biggest day-to-day annoyance in your work that nobody mentions in lectures?

If the quantum hardware timeline stretches out or slows down, how transferable are the skills from a quantum info/optics PhD to broader computational physics or industry roles?

Apologies again for the long list of questions, and thanks in advance for any advice you can share!

Hey,

I have a quick question for anyone who knows about quantum physics.

I recently stumbled across a discussion of the delayed-choice experiment, and it blew my mind. It made me really curious about the whole field of quantum physics, as well as ideas like quantum cognition and quantum consciousness.

What would you recommend for someone who wants to learn quantum physics from scratch? I’m looking for a book, video, lecture, or anything else that will fuel my curiosity without scaring me away with complex equations I don’t understand yet.

Thanks :)

In this interview with Prof. Dr. Bernd Ulmann we are going back in time and we will travel into the future. Analog computers existed before the digital systems took off and they are still playing a role - how much closer to our own analog world can you come than with an analog computer?

Analog computers still hold an interesting promise: they work, they are fast, they are very energy efficient and the technology is well understood. That is why Bernd is confident that analog co-processors will play an even role next to quantum co-processors in our digital high performance computer systems. Watch the full interview here: https://youtu.be/ozcl2u_IRg0?si=AF-YPGFF9Bh8I0vw

Please tell about quantum physics like you're really INTO it, like you LOVE it. Without AI, in your own words.

Hi everyone,
I’m a recent Electrical and Electronic Engineering graduate from a university in Europe, with no professional engineering experience yet.
I’m currently trying to decide whether to pursue a Master’s in Quantum Computing or continue specialising in Electrical and Electronic Engineering.
I’m genuinely interested in quantum computing, but I’m concerned about job opportunities, especially in Europe. Most positions I’ve seen seem to prefer PhD holders, and I’m not planning to pursue a PhD anytime soon.
My biggest concern is spending a significant amount of money on a specialised Master’s and struggling to find a job afterwards.

My main questions are:
Is a Master’s in Quantum Computing worth it without a PhD?

How realistic is it to find a job in the quantum industry with just a Master’s and no experience?
Do you expect job opportunities to grow in Europe over the next 3–5 years?

Would it be better to continue with a Master’s in Electrical and Electronic Engineering and potentially transition into quantum computing later?

If you were in my position, would you choose Quantum Computing or Electrical and Electronic Engineering for your Master’s?
I’d really appreciate advice from people working in the industry!

Sorry if this post breaks any rules please remove it if it does

Also a disclaimer: I have ZERO knowledge of quantum physics outside of the stuff that seeps into pop culture which I'm sure is mostly bogus so forgive me if this question is silly

I'm basically just wondering if it's actually possible for there to be organisms that are sub-atomic

Cause if you can make an animal with molecules, why not with protons or whatever?

This material is provided as a practical example for a deep understanding of the hydrogen atom. I hope it helps you ace your quantum mechanics exams.

1. Physical Meaning of the 3-Term Recurrence Relation:

2. How to interpret this mathematical formula as the algebraic origin of quantum ladder operators.

3. Orbital Expansion: How to calculate the expectation value of the orbital radius as the principal quantum number increases.

4. Quantum Transitions: How the radial position operator algebraically mediates transitions between adjacent radial states.

A 15-second simulation of interacting waves in a 2D quantum fluid, calculated using the Gross–Pitaevskii equation. All motion comes from the numerical simulation, with stylized rendering and Vivaldi's Presto as the soundtrack.

Is all are ok or something missing or wrong🥹😋