A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Universality of sequential quantum measurements
Tekijät: Teiko Heinosaari, Takayuki Miyadera
Kustantaja: AMER PHYSICAL SOC
Julkaisuvuosi: 2015
Journal: Physical Review A
Tietokannassa oleva lehden nimi: PHYSICAL REVIEW A
Lehden akronyymi: PHYS REV A
Artikkelin numero: 022110
Vuosikerta: 91
Numero: 2
Sivujen määrä: 6
ISSN: 1050-2947
DOI: https://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.