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Results tagged with quantum-information
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user 165556
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.
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How do I plot the decoherence of an open system from its density matrix?
If I have a two qubit state interacting with an environment that will decohere it, how do I model the decoherence from the density matrix? For example, if I start with some state
$\Psi(0)=|0>_1|1>_2\o …
- 187
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answer
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What are the range of values of the negativity in quantum mechanics?
The negativity of a quantum state, given by
$N(\rho)=\frac{||\rho^{\Gamma_A}||-1}{2}$
where $\rho^{\Gamma_A}$ is the partial transpose with respect to subsystem $A$ of the density matrix of a quantu …
- 187
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How to measure a qubit state?
I'm trying to work out how to do a non-demolition measurement on a qubit using an ancilla photon. I start with an entangled electron and nucleus in the state
$$ \frac{1}{\sqrt{2}}(\alpha|\uparrow\Dow …
- 187