I have an idea you guys want to start a new system quantum I swear has that power to change everything. I will teach anyone how to build your own quantum AI

(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?

Is anyone familiar with known or suspected contradictions between set theory and Quantum mechanics? I ask because as I've had more interest in set theory it seems it's ontology is based on useful logical constructions that gets rid of Russell's Paradox but isn't an inherently proven aspect of reality. Which if that's the case to me seems is a surprisingly shaky ground for something like particle physics.

But also I just suspect I'm getting something wrong. If anyone has any related input that would be wonderful.

This is a diagram I did of the double slit experiment both in it’s macroscopic scale at with individual particles. I’m trying to figure out how best to show the decoherence cause by the sensor, here I’ve drawn it as a blue glow (to contrast the red), but I want to make an explanatory animation of the effect and don’t want to be misleading with the graphics.

https://dlfelps.github.io/tags/quantum/

5 posts on basic quantum mechanics principles. I used Pharo Smalltalk to explore:

• superposition
• measurement problem
• delayed-choice experiment
• non-locality

P.S. Starts with Experiment #10 due to the fact that this is only a subset of my entire blog.

Hello everyone.

In the context of the 1-dimensional quantum harmonic oscillator, we introduce the operators Xhat for the position and Phat for the momentum, which extract information on the observables X and P. Xhat and Phat do not commute in accordance with the quantum formalism, unlike the observables X and P: in French we say that Xhat and Phat follow a "relation de commutation canonique" such as [Xhat, Phat] = i. We introduce Hhat the Hamiltonian operator: Hhat = 1/2 (Xhat² + Phat²), so I wonder if I can factor this polynomial (Xhat² + Phat²) with the model a² - b² = (a - b)(a + b)? So that we arrive at Xhat² + Phat² = (Xhat - i Phat)(Xhat + i Phat). Afterwards I know that it will be necessary to use the operators a, a† and N to unfold all this correctly, but I just wanted to know this trick for what I consider to be a quadratic polynomial with two variables. Also sorry for that ugly "hat" notation.

Hello everyone,

In the literature, it is quite common to approximate the output of a laser using a coherent state. This is especially the case in quantum cryptography (where lasers are commonly used for state preparation).

I'm wondering which quantum state is commonly used to model the output of an LED source. Would appreciate if anyone can provide a textbook or journal reference!

Thank you in advance!

We have a requirement for our subject where class scheduling is done using quantum annealing. Which one is better to use for this, D-Wave or Qiskit?

We hear a lot about start-ups trying to build new kind of Qbits and scaling up Quantum Computing Hardware. However, so far the most promise for actual real world applications seems to be in quantum simulations and mapping optimization problems to Hamiltonians that can be engineered on these platforms (Please feel free to correct me or add more context as I am very interested). Of course we all know about cold atoms but I also heard that Rydberg atoms seem to scale very well and could be soon used in these settings. Companies like IBM and google have advanced circuit QED technology but they seem to focus on the logic gates approach. Now, I was wondering why I do not know of any industry research in these areas (except perhaps DWave with quantum annealing). As someone finishing a PhD related to quantum simulations I feel this is something I would like to know. In particular, if someone has insights about the general landscape of the "quantum" industry I would be happy to hear about it. Also, if you have any ideas how someone with a theoretical background in many-body bosonic systems could find opportunities in a related industry I am all ears.

EDIT: Seems that QuEra, Pasqal and Quantinuum are more quantum simulation focused industry players. QuEra and Pasqal are using neutral atoms while Quantinuum is using trapped ions

I'm searching for funny and quirky items such as brochures, posters, or origami for a quantum computing event. Do you have any ideas or links?