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Results tagged with quantum-information
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user 165676
Quantum information is the study of the informational content of quantum states. The most common object of study is the "qubit", the information in a two-state quantum system such as spin-1/2 or photon polarization.
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
0
votes
Homodyne detection as quantum measurement
Nice question. To be sincere, I never thought about the fact that homodyne measurement is, in some sense, an "indirect" measurement of a quadrature. Even if I 'm relatively new, I'll try to answer.
F …
- 440
3
votes
CNOT and FTL communication
The reason is that the CNOT operation is not a separable operation, i.e., you cannot write $U_{NOT}=U_A\otimes U_B$ where $U_A$ acts only on the first subsystem and $U_B$ acts only on the second. In o …
- 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
Prove that in Bell's inequality $\langle{\Psi}|\left(\bf{\sigma}\cdot\bf{a}\right)\left(\bf{...
You can solve this by applying the definition of the Pauli vector, i.e.,
$${\bf{\sigma}\cdot\bf{a} }=\sigma_xa_x+\sigma_ya_y+\sigma_za_z$$
where $a_x,a_y,a_z$ are the components of $\bf a$ and $\sigma …
- 440