| 21. | Nevertheless, the density matrix contains all the information necessary to calculate any measurable property of the mixed state.
|
| 22. | In rough analogy, a POVM is to a PVM what a density matrix is to a pure state.
|
| 23. | In this case, the diagonal components of the density matrix become negligible after introducing the thermal distribution function,
|
| 24. | This demonstrates that, as expected, the reduced density matrix for an entangled pure ensemble is a mixed ensemble.
|
| 25. | The density matrix can be shown to transform to the interaction picture in the same way as any other operator.
|
| 26. | Using this concept, in conjunction with the density matrix he extended the classical concept of entropy into the quantum domain.
|
| 27. | The Lindblad equation in quantum mechanics is a generalization of the master equation describing the time evolution of a density matrix.
|
| 28. | That is, ? can have a definition somewhat broader than that of a density matrix; the theorem still holds.
|
| 29. | In the Heisenberg picture, the density matrix does not change with time, but the operators are time-dependent.
|
| 30. | The trace-class operator " W " can be interpreted as the density matrix of a quantum state.
|
