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


Aug
18
comment Why does Matter occupies space? Matter and space are two things… If Space does not has mass, why should matter have space-ful nature?
@brightmagus: Well, yes and no - and that's exactly what I try to say here: There are TWO notions of "occupying space". The one we have of a classical object, say, a football, occupying a certain amount of space and the quantum version, where two fermions cannot be in the same state and two states will have spatial probability distributions (indicating where it is likely to "find" the particle) that hardly overlap.
Jul
31
comment What is the speed of light from a star moving towards a observer.?
The answer would be a duplicate from e.g. here physics.stackexchange.com/q/2230
Jul
8
comment Is frequency or Bayesian interpretation used in quantum mechanics?
Both and/or none. Search for "Quantum Bayesianism" - a major advocate is Christopher Fuchs from Perimeter - or "Ensemble Interpretation" - I guess Ballentine is a big proponent. However, most people hardly care...
Jul
7
answered If I have created a polarization-entangled photon source, would I be able to create a qubit?
Jun
16
reviewed Reviewed Calculating Quantum number from initial conditions
Jun
16
comment Universality of Quantum Operations
To me, "quantum operations" refers to general completely positive maps. In this setting, I don't know of any such result, which doesn't mean it doesn't exist. If you don't want the full generality of completely positive maps, you should specify
Jun
9
reviewed Reviewed With redshift, energy is lost. Where does it go?
Jun
1
revised Stimulated emission and No cloning theorem
retagged question
Jun
1
suggested suggested edit on Stimulated emission and No cloning theorem
Jun
1
answered Stimulated emission and No cloning theorem
Jun
1
reviewed No Action Needed How is the charge concentrated at the centre of shell for calculating potential from it?
Jun
1
reviewed No Action Needed How a plasma reacts with an AC electromagnet
May
27
reviewed Reviewed Equivalences for mCi doses and Rads?
May
26
comment Unstable states and imaginary (complex) energy?
probably a calculation trick akin to here: physics.stackexchange.com/q/60185 - but I don't know the exact circumstances.
May
22
reviewed Reviewed How do you determine who is moving “faster” in relativity?
May
22
reviewed No Action Needed Steady state average of physical quantities
May
19
comment Quantum Simulation of Schrodinger's equation
@KishorBharti You don't, of course - but the statememt is not limited to finite dimensions, and x and p are unbounded operators. Note that an operator is always defined by its action, i.e. $v$ a vector in the domain of $x$, then $xv$ is another such vector. The transformation of this equation would be $UxU^{\dagger}Uv$.
May
19
comment Quantum Simulation of Schrodinger's equation
that's always the way matrices transform. A vector $v$ transforms according to $Uv$, but a matrix $A$ transforms according to $UAU^\dagger$.
May
18
comment Double slit experiment and single particles. Is the wave function just a mathematical model?
true that. Thanks for pointing out that spelling blunder...
May
18
revised Double slit experiment and single particles. Is the wave function just a mathematical model?
corrected spelling