| Autor: |
LANDOLFI, GIULIO, RUGGERI, GIOVANNA, SOLIANI, GIULIO |
| Předmět: |
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| Zdroj: |
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics; 6/10/2005, Vol. 19 Issue 14, p2287-2310, 24p |
| Abstrakt: |
A comparative study is performed on two heterodyne systems of photon detectors expressed in terms of a signal annihilation operator and an image band creation operator called Shapiro–Wagner and Caves' frame, respectively. This approach is based on the introduction of a convenient operator $\hat\psi$ which allows a unified formulation of both cases. For the Shapiro–Wagner scheme, where $[\hat\psi, \hat\psi^{\dag}] = 0$, quantum phase and amplitude are exactly defined in the context of relative number state (RNS) representation, while a procedure is devised to handle suitably and in a consistent way Caves' framework, characterized by $[\hat\psi, \hat\psi^{\dag}]\neq 0$, within the approximate simultaneous measurements of noncommuting variables. In such a case RNS phase and amplitude make sense only approximately. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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