Coupled harmonic oscillators for the measurement of a weak classical force at the standard quantum limit

Physical Review A - Atomic, Molecular, and Optical Physics

Volumn 76, Issue 6, 2007, Pages

  Leaci, Paola ^a   Ortolan, Antonello ^b  

^a UNIVERSITY OF TRENTO   (Italy)

^b LABORATORI NAZIONALI DI LEGNARO   (Italy)

Author keywords

[No Author keywords available]

Indexed keywords

GRAVITY WAVES; PRECISION ENGINEERING; QUANTUM CASCADE LASERS; SIGNAL PROCESSING;

COUPLED HARMONIC OSCILLATORS; STANDARD QUANTUM LIMIT;

OSCILLATORS (ELECTRONIC);

EID: 40649093792     PISSN: 10502947     EISSN: 10941622     Source Type: Journal    
DOI: 10.1103/PhysRevA.76.062101     Document Type: Article

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35. Here, the term "fundamental" refers to the continuous measurement of the position of a test mass. On the contrary, an external classical force acting on a quantum system can be observed with arbitrary precision by a properly designed probe; in fact, the operator algebra associated to a classical force is commutative and so no fundamental restriction on the precision of classical force measurements exists (see, e.g., Ref.).