All Questions
9
questions
3
votes
2
answers
132
views
General definition of POVM
Wikipedia gives the following definition of positive operator-valued measure (POVM):
A POVM on a measurable space $(X,M)$ is a function $F$ defined on $M$ whose values are bounded non-negative self-...
- 759
3
votes
2
answers
354
views
Extension of Choi-Jamiolkowski isomorphism to not completely positive maps
In quantum physics, the concept of Channel-State duality is of prime importance in understanding the final state of the system after passing through a channel or performing quantum operations. The ...
- 587
9
votes
3
answers
3k
views
Mathematically rigorous Quantum Mechanics
I am a student of mathematics attending a course in Quantum Mechanics. This course is held by a physicist, and it is really confusing for me to follow his reasonments. With this, I do not mean to be ...
- 2,532
2
votes
0
answers
108
views
Spectrum of $H = - \Delta + y^2 + a e^{b(x+y)}$.
Define the Hamiltonian
$$
H = - \Delta + y^2 + a e^{b(x+y)}\,,
$$
where $- \Delta = - \partial_x^2 - \partial_y^2$ and $a,b > 0$. I'm trying to determine the spectrum and/or generalized ...
- 2,949
9
votes
1
answer
2k
views
Complementary text for mathematical Quantum Mechanics lectures
I'm looking for a text to complement Frederic Schuller's lectures on QM. His approach is very mathematical -- in fact it looks like the first 12 of 21 lectures are just about the mathematical ...
- 2,730
12
votes
1
answer
2k
views
Baker Campbell Hausdorff formula for unbounded operators
Baker Campbell Hausdorff formula says that for elements $X,Y$ of a Lie algebra we have
$$e^Xe^Y=\exp(X+Y+\frac12[X,Y]+...),$$
which for $[X,Y]$ being central reduces to
$$e^Xe^Y=\exp(X+Y+\frac12[X,Y])....
- 121
3
votes
2
answers
274
views
Book on periodic Schrödinger operators
I am looking for good books about the spectral theory of periodic (1-dimensional) Schrödinger operators on a compact interval.
A good reference I found was Reed/Simon Analysis of Operators (and a ...
user66906
2
votes
1
answer
589
views
Functional analysis and Quantum Mechanics
I am presently doing a course on functional analysis. I have done courses on quantum mechanics before. I see that many functional analysis books have an ending chapter on quantum mechanics.
So are ...
- 229
3
votes
2
answers
751
views
Expectation value of pure state in quantum mechanics
It's well known that in quantum mechanics, the expectation value of a self-adojint operator $A$ in pure state $|\psi\rangle$ is $\langle\psi |A|\psi\rangle = \operatorname{Tr}(A |\psi \rangle \...
- 310