1,769 reputation
218
bio website
location
age
visits member for 11 months
seen 50 mins ago

I'm a mathematical physicist in training working primarily on questions concerning quantum information and general quantum mechanics.


Sep
16
comment Is this quote really from Heisenberg?
To me, this seems like a good question for skeptics.stackexchange. Otherwise, this seems reminiscent of "Die Energie ist tatsächlich der Stoff, aus dem alle Elementarteilchen, alle Atome und daher überhaupt alle Dinge gemacht sind, und gleichzeitig ist die Energie auch das Bewegende.", which has similar words but a completely different meaning.
Sep
15
comment What kind of transformation can be applied to qubits?
And here: physics.stackexchange.com/questions/71949/… you have more information about how the XOR is implemented reversibly (note that |x> in front, that's the trick!)
Sep
14
answered Why is the full eigen function is product of eigen functions and not addition?
Sep
13
awarded  quantum-mechanics
Sep
12
answered Does a random local unitary destroy entanglement
Sep
12
comment Does a random local unitary destroy entanglement
Why does this question have anything to do with the reality of the wave function?
Sep
10
revised Does the superposition principle affect the space of quantum states?
typos corrected
Sep
10
comment Scalable quantum computation vs Uncertainty Principle
I don't really understand your main concern. There seem to be a lot of different notions around. For me, scalable means: Using a bigger computer. In a classical computer this means more memory and more transistors. In a quantum computer, it should be the same, more qubits and more (fault tolerant) gates, hence, why more precision? If it's fault tolerant before, it should be fault tolerant after. Second: The quantum algorithm in itself. In reality, q.a. have probabilistic outcomes, so the result is just to take a majority vote on multiple runs as pointed out by the given answer.
Sep
10
answered Does the superposition principle affect the space of quantum states?
Sep
10
reviewed No Action Needed Frequency modulation using visible light
Sep
9
reviewed No Action Needed Do Franck-Condon oscillations have natural lineshapes?
Sep
9
answered Does one really need classical physics in order to understand quantum physics?
Sep
9
comment A new way of looking and formulation of Observables for a new quantum theory
@DanielSank: No problem! I was just wondering.
Sep
8
comment A new way of looking and formulation of Observables for a new quantum theory
I don't quite get your comment, sorry - could you elaborate? I'm just saying that you can indeed measure exact values for x and p for a given instance of a state.
Sep
8
reviewed No Action Needed Electric Field of a sphere
Sep
8
answered A new way of looking and formulation of Observables for a new quantum theory
Sep
8
revised Difference between heat capacity and entropy?
fixed comment.
Sep
8
comment Difference between heat capacity and entropy?
Well, yes, I meant the entropy change of course, which is material independent, I'll make this more clear. Also, heat capacity is not process dependent in the way I thought about it: It's true, there are different capacities for whether you keep volume/pressure fixed, but within these equations, the process doesn't matter - as long as you fix volume or pressure, the process can be both reversible or irreversible, because the definition doesn't depend on this. I'm maybe thinking from a not too much thermodynamic perspective here, so you might well critizise this, at least I have to clarify.
Sep
8
answered Difference between heat capacity and entropy?
Sep
8
comment Physically realizable quantum circuits
Especially c) seems to me to prevent scaling a quantum computer. Of course, there are other schemes (dissipative, measurement based, adiabatic), which may circumvent this problem. Otherwise, please note that I'm a theorist, so I don't have all up to date numbers in my head, but I could take some time and search for some references...