Let the Werner state $\rho_W = W\mid\Phi^+\rangle\langle\Phi^+\mid + \frac{1-W}{4}\mathbb{I},\ W\in [0,1]$. I have repeatedly heard that such a state is separable if $W\leq\frac{1}{3}$ and entangled otherwise. I know the definition of entanglement, but am having trouble working with the density m...
I have read this question:
Why does hot oil explode when pouring water on it?
It explains in a classical way clearly, that the boiling point of oil is hotter then water, and water changes to steam very fast and explodes the oil.
Oil heats up faster than water because it has a lower spe...
Consider a toy 1-dimensional model molecule: two particles with positions $x_1$ and $x_2$ and the same (for simplicity) masses, attracted to each other by a harmonic potential
$$U(x_1-x_2)=U_0 (x_1-x_2)^2.$$
Let this molecule come across a potential barrier, which has the same potential energy ...
I read that it happens when passing a nucleus or an electron, but why does that cause pair production to take place?
In Cohen-Tannoudji, at page 303, vol 1, it is given that
Quote:
\begin{array}{l}{\text { A calculation analogous to the preceding one gives the following expression }} \\ {\text { for the non-diagonal element } \rho_{n p} :} \\ {\qquad \rho_{n p}=\sum_{k} p_{k} c_{n}^{(k)} c_{p}^{(k) *}}
{l}{c...
$\ a\lvert\alpha\rangle =\alpha\lvert\alpha\rangle$
Where $a$ is the annihilation operator mentioned in algebraic method of harmonic oscillator ,$a\lvert n\rangle = \sqrt n\lvert n-1\rangle$
Suppose we can express $ \lvert\alpha\rangle $
as
$\lvert\alpha\rangle =\sum_{n=0}^\infty c_n\lvert n\ra...
Why we use p=-ihd/dx in quantum physics ?(i know the reason for ih,quantization :-) ).Is this right to say we can't measure velocity and position of electrons at the same time,so we use mathematic mothed,Fourier transformation?
I'd like to build a cheap and simple "quantum-ish" coin flip circuit.
I have posted in the EE stack exchange about the specific circuit design, but was wondering if anyone in physics would have enough overlap in understanding to help me.
My idea is to use simple latching circuit driving two LE...
