Linked Questions
12 questions linked to/from Differences between pure/mixed/entangled/separable/superposed states
-1
votes
1
answer
292
views
Example of mixd entangled state [duplicate]
I'm looking for specific examples of all combinations of pure, mixed, separable and entangled states, but I would prefer if they all have some physical significance.
For pure states, the separable ...
- 327
3
votes
0
answers
143
views
What does a "pure" state mean in QM? [duplicate]
Question:
In Quantum Mechanics, people use the word "pure state" for some states; however, what do they mean exactly ?
Thoughts:
I mean, a state is a vector in our vector (Hilbert) space, so in that ...
- 2,313
1
vote
1
answer
83
views
Entanglement in quantum physics [duplicate]
Mathematically what is the difference between pure separable state and entangled state ?
Can anyone explain with equations?
- 29
0
votes
0
answers
37
views
Need help understanding weird definition of pure states [duplicate]
So in many sources I have read that
A pure state contains only one element, since the only entry on the
density matrix will be 1.
But what about superpositions?...
- 415
123
votes
10
answers
41k
views
How is a quantum superposition different from a mixed state?
According to Wikipedia, if a system has $50\%$ chance to be in state $\left|\psi_1\right>$ and $50\%$ to be in state $\left|\psi_2\right>$, then this is a mixed state.
Now, consider the state
$...
- 29.6k
6
votes
2
answers
3k
views
What are the relations between mixed/pure and separable/entangled states?
I read this question which clarified the concepts of mixed/pure/separable/entangled states, but I can't see if one of "mixed/pure" implies one of "separable/entangled" and/or vice ...
- 6,049
9
votes
1
answer
5k
views
Methods to distinguish between pure/mixed states and entangled/separable states
I'm a little confused about how we can distinguish between pure/mixed states and entangled/separable states and I would really appreciate some help!
I understand a density operator $\rho$ represents ...
- 623
1
vote
2
answers
465
views
Entanglement of Tripartite States
Is there any simple algorithm to determine the entanglement of a tri-partite state?
In particular, what is the proof for entanglement of $ |GHZ\rangle $ and $ |W\rangle $ states?
$ |GHZ\rangle =\...
- 2,342
1
vote
2
answers
905
views
Physical meaning of mixed state
Suppose we have two quantum mechanical systems with Hilbert spaces $H_1$ and $H_2$ respectively. I am trying to understand the difference between an entangled, pure, state compared to an entangled (...
2
votes
1
answer
252
views
How to understand the three state descriptions from 3 observers of such a system?
Assuming an EPR pair $\psi_{AB}=|00>+|11>$ and three observers Alice, Bob and Charlie, who can communicate with each other but they do not do it for the time being.
Alice with a qubit $|0>$ ...
- 1,576
9
votes
1
answer
581
views
Trying to understand mixed states
I took a basic quantum chemistry course (McQuarrie's "Quantum Chemistry"), but it never dealt with mixed states -- only pure states (or if it did, we never got to it in class).
So I'm trying to ...
- 3,009
1
vote
2
answers
126
views
When is a quantum state pure and when mixed?
Every definition of the two is always very abstract to me. Like, A pure state is located on the surface of the bloch sphere while the mixed state is somewhere within.
First of all, what is an ...
- 21