Non-representative Quantum Mechanical Weak Values
Författare
Summary, in English
The operational definition of a weak value for a quantum mechanical system involves the limit of the weak measurement strength tending to zero. I study how this limit compares to the situation for the undisturbed (no weak measurement) system. Under certain conditions, which I investigate, this limit is discontinuous in the sense that it does not merge smoothly to the Hilbert space description of the undisturbed system. Hence, in these discontinuous cases, the weak value does not represent the undisturbed system. As a result, conclusions drawn from such weak values regarding the properties of the studied system cannot be upheld. Examples are given.
Avdelning/ar
Publiceringsår
2015
Språk
Engelska
Sidor
1645-1656
Publikation/Tidskrift/Serie
Foundations of Physics
Volym
45
Issue
12
Dokumenttyp
Artikel i tidskrift
Förlag
Springer
Ämne
- Other Physics Topics
Nyckelord
- Quantum Cheshire cat
- interferometers
- Mach-Zehnder
- Weak trace criterion
- Non-representative limit
- Weak value
Status
Published
ISBN/ISSN/Övrigt
- ISSN: 0015-9018