Jun 15, 2018 · What is the motivation behind density matrices? And, what is the difference between the density matrices of pure states and density matrices of mixed states? This is a …

Feb 2, 2021 · What do the off-diagonal elements of a density matrix physically represent? Ask Question Asked 4 years, 9 months ago Modified 4 years, 9 months ago

Feb 13, 2023 · How to get a noisy density matrix after partial measurements in Qiskit Ask Question Asked 2 years, 8 months ago Modified 2 years, 7 months ago

I have a Hamiltonian and I want to know the corresponding density matrix. The matrix I'm interested in is the one in this question.

Dec 16, 2023 · According to my investigation and experiments, we cannot initialize a circuit with mixed state density matrix trivially. Finally, I used QuTip to perform the simulation and …

Sep 12, 2023 · The eigenvalues of a pure density matrix are either $^1$ 1 or 0. Hence, taking the square root will give you the same eigenvalues, $\sqrt {1} = 1,\sqrt {0} = 0$; and hence, the …

Apr 22, 2019 · First, the example that you give is not a density matrix (they must have trace 1). Second, you’re asking how to go from the matrix into an operator representation that is not …

Jun 17, 2023 · What is the density matrix of a pure state? Ask Question Asked 2 years, 4 months ago Modified 7 months ago

Dec 23, 2022 · In quantum information theory, calculating the log of a density operator is essential for things like the Von Neumann entropy or the entropy of entanglement. Unfortunately, this …

Dec 7, 2020 · The key point is that two different ensembles can give rise to the same density matrix. And, given knowledge of only the density matrix, we cannot assign a unique ensemble …