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5 Answers

Score Activity Newest
4 votes
Accepted

Is the quantum state fidelity defined as $F(\rho, \sigma)=\text{tr}\sqrt{\rho^{1/2}\sigma\rho^{1/2}}$ or its square?

quantum-state density-matrix nielsen-and-chuang fidelity trace-distance
answered Apr 14, 2020 at 20:39
2 votes
Accepted

What's the interpretation of the eigenvalues of qubit's projective operators?

measurement projection-operator
answered Apr 21, 2020 at 14:59
1 vote

Is the set of density operators invariant under the induced action of the unitary group?

density-matrix
answered Apr 12, 2020 at 18:53
0 votes

The correct set of measurement operators on a mutiple qubit system

quantum-state measurement tensor-product
answered Aug 8, 2019 at 18:39
0 votes

Bounding diamond norm distance using probability of error in transmission of classical information

quantum-operation classical-quantum channel-capacity diamond-norm
answered Aug 1, 2021 at 17:36
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