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Results tagged with quantum-state
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user 9393
Questions about or related to quantum states. Consider using the density-matrix tag when relevant.
1
vote
What is the best way to extend a state $\rho_S$ to a tensor product of spaces ${\cal H}_S\ot...
There is no more natural way of doing the extension. Yet, two are most often used:
You do not want to make hypotheses about the state of A besides its dimension so that the state of SA will be $\rho_ …
- 181
2
votes
How many probabilities does the number of qubits represent?
The speed up is not expressed by the exponentially many basis states that a quantum system can be in.
The speedup comes from being able to recombine the probability amplitudes associated to the thes …
- 181
0
votes
Non-entangled two qubit system get information about the individual particle states after CNOT
Your end state is not entangled. As you have written, the state vector after the gate is the same as the one before the gate. And your starting state is obviously not entangled.
As for the rest of y …
- 181
0
votes
Can quantum chips be spied on?
Yes, you can in principle spy on a computation - albeit using more subtle/gentle methods than entangling everything -, but you can prevent it.
The setting is that of a client who whishes to perform a …
- 181