A new type of procedures, called protective measurements, was proposed by Aharonov, Anandan, and Vaidman [Phys. Rev. A 97, 4616 (1993); Found. Phys. 26, 117 (1996)]. These authors argued that a protective measurement allows the determination of arbitrary observables of a single quantum system, and claimed that this favors a realistic interpretation of the quantum state. This paper proves that only observables that commute with the system’s Hamiltonian can be measured protectively. It is argued that this restriction saves the coherence of alternative interpretations.
|Original language||English (US)|
|Number of pages||8|
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|State||Published - Nov 1999|