469 reputation
212
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location Kanpur, India
age 22
visits member for 2 years, 8 months
seen May 25 at 13:59

Apr
28
revised What does it mean for a Hamiltonian or system to be gapped or gapless?
Modified the LaTeX string to better represent the thermodynamic limit
Apr
28
suggested approved edit on What does it mean for a Hamiltonian or system to be gapped or gapless?
Apr
23
comment Entanglement of coherent states
Interesting! At first glance, even I thought that this would be a Gaussian state. A useful rule of thumb would be to start off in a coherent state and imagine trying to create the state with just displacement and squeezing operators acting on it. @Ilya, it is true that they are entangled if a subsystem is mixed, but the connection between local purity and amount of entanglement between two subsystems is not so obvious (it's not, in general, a monotone), see here: maths.nottingham.ac.uk/personal/ga/papers/2251.pdf
Feb
20
comment Accurate quantum state estimation via “Keeping the experimentalist honest”
+1 for "V-Wade". :D
Feb
20
comment The Simon's Algorithm, confusing equation
@Makaveli, if the answer satisfies you, please consider accepting it. Thanks! :)
Feb
20
comment The Simon's Algorithm, confusing equation
Out of curiosity, what book are you using?
Feb
20
answered The Simon's Algorithm, confusing equation
Nov
27
comment Physical meaning of the angular momentum
Good answer, but it needs jens_bo's answer in order to completely give the OP an idea of why "we need to multiply linear momentum by position".
Sep
30
awarded  Explainer
Sep
28
awarded  Yearling
Sep
10
comment The triangle inequality in CHSH derivation, where is the triangle?
In equation 6 of the Wikipedia link in the question, we have something that reads like $X - Y = a - b$, which upon taking the modulus becomes $|X - Y| \leq |a| + |b| $. Here the modulus is simply the absolute value of the real numbers X, Y, a and b. So there is no length in "metres", because there is no length scale associated with this problem. I am sorry if my previous comment confused you, the vectorial notation is not really necessary since you are simply dealing with numbers on the real line here.
Sep
10
comment The triangle inequality in CHSH derivation, where is the triangle?
The triangle inequality is a special case of the Cauchy-Schwarz inequality, which is the one applicable here since you are taking norms of the expectation value. The "triangle" formed is the one with the sides $ \bar{X} $, $\bar{Y}$, and $\bar{X}+ \bar{Y}$.
May
10
comment Why didn't we replace our SI units with a better system?
@GlenTheUdderboat it seems like you have missed three important negative signs in the exponent for the values of $h$, $e,$ and $k$.
Apr
29
comment Weak measurement and Hardy's paradox
Is the 3rd condition supposed to be B' = -1? The third paragraph that follows the conditions and the wave function seem to indicate this.
Apr
4
awarded  Excavator
Apr
4
revised Aharonov-Bohm Effect and Integer Quantum Hall Effect
The earlier link was broken, updated it now.
Apr
4
suggested approved edit on Aharonov-Bohm Effect and Integer Quantum Hall Effect
Feb
21
awarded  Citizen Patrol
Feb
10
comment How can a photon have no mass and still travel at the speed of light?
There can also exist massive point particles. The introduction of length contraction is really irrelevant here.
Feb
10
comment How can a photon have no mass and still travel at the speed of light?
Compaction due to length contraction is not a valid concept for a point particle like a photon, and in any case, it is not related to increase in relativistic mass.