Entanglement detection with bounded reference frames

Costa, Fabio, Harrigan, Nicholas, Rudolph, Terry and Brukner, Caslav (2009) Entanglement detection with bounded reference frames. New Journal of Physics, 11 . doi:10.1088/1367-2630/11/12/123007


Author Costa, Fabio
Harrigan, Nicholas
Rudolph, Terry
Brukner, Caslav
Title Entanglement detection with bounded reference frames
Journal name New Journal of Physics   Check publisher's open access policy
ISSN 1367-2630
Publication date 2009-12-04
Sub-type Article (original research)
DOI 10.1088/1367-2630/11/12/123007
Open Access Status DOI
Volume 11
Total pages 11
Place of publication Bristol, United Kingdom
Publisher Institute of Physics Publishing
Language eng
Abstract Quantum experiments usually assume the existence of perfect, classical reference frames (RFs), which allow for the specification of measurement settings (e.g. orientation of the Stern-Gerlach magnet in spin measurements) with arbitrary precision. If the RFs are 'bounded' (i.e. quantum systems themselves, having a finite number of degrees of freedom), only limited precision can be attained. Using spin coherent states as bounded RFs, we have found the minimum size needed for them to violate local realism for entangled spin systems. For composite systems of spin 1/2 particles, RFs of very small size are sufficient for the violation; however, to see this violation for macroscopic entangled spins, the size of the RF must be at least quadratically larger than that of the spins. The unavailability of such RFs gives a possible explanation for the non-observance of violation of local realism in everyday experience.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mathematics and Physics
 
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