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Results tagged with quantum-entanglement
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user 165676
Quantum entanglement is the mechanism by which quantum correlations between two sub-systems survive even after being physically separated from an interaction region. The correlations could in principle survive without neither time nor space constraint.
1
vote
Accepted
Why does E91 protocol use the CHSH inequality instead of QBER?
Quantum key distribution (QKD) algorithms can be roughly divided in two categories: prepare and measure (P&M) and entanglement-based (EB). The aim is the same: distribute information-theoretically sec …
- 440
3
votes
Accepted
BB84 protocol vs. E91 protocol
As I explained in your previous question, both protocol are safe, as every other QKD protocol in the literature (e.g., SARG04, Decoy states, ...). The difference in the protocol is only in the practic …
- 440
2
votes
1
answer
3k
views
Derive explicit expression of squeezed vacuum state in the Fock basis
I'm learning quantum optics, and I'm starting to manage boson algebra.
In particular, as a pure exercise, I would like to express a squeezed vacuum state in the Fock basis, which, according to Weedbr …
- 440
3
votes
Is uncertainty and correlations actualy the same thing?
Just to expand a little bit Bruce's answer...You can convince yourself about the properties of the Von Neumann entropy by proving two simple properties.
Let suppose to have a state $\rho$ in a $d$ …
- 440
2
votes
Accepted
Does entangled states must become non entangled states after the measurement?
You must distinguish between collective measurement and separabale measurement. I think that I can answer to all of your questions starting from a simple example. Let suppose that we have a pair of qu …
- 440