Universality of sequential quantum measurements




Teiko Heinosaari, Takayuki Miyadera

PublisherAMER PHYSICAL SOC

2015

Physical Review A

PHYSICAL REVIEW A

PHYS REV A

022110

91

2

6

1050-2947

DOIhttps://doi.org/10.1103/PhysRevA.91.022110



We show that any jointly measurable pair of quantum observables can be obtained in a sequential measurement scheme, even if the second observable will be decided after the first measurement. This means that it is possible to perform a measurement of any quantum observable in a way that does not disturb the subsequent measurements more than is dictated by joint measurability. Only measurements with a specific structure have this universality feature. As a supplementing result, we provide a characterization of all possible joint measurements obtained from a sequential measurement lacking universality.




Last updated on 2024-26-11 at 18:08