Reference : Heisenberg-limited sensitivity with decoherence-enhanced measurements
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/64251
Heisenberg-limited sensitivity with decoherence-enhanced measurements
English
Braun, D. [> >]
Martin, John mailto [Université de Liège - ULg > Département de physique > Optique quantique >]
Mar-2011
Nature Communications
2
223
1-9
Yes (verified by ORBi)
International
2041-1723
[en] Quantum-enhanced measurements use quantum mechanical effects to enhance the sensitivity of the measurement of classical quantities, such as the length of an optical cavity. The major goal is to beat the standard quantum limit (SQL), that is, an uncertainty of order 1/ N, where N is the number of quantum resources (for example, the number of photons or atoms used), and to achieve a scaling 1/N, known as the Heisenberg limit. So far very few experiments have demonstrated an improvement over the SQL. The required quantum states are generally highly entangled, difficult to produce, and very prone to decoherence. Here, we show that Heisenberg- limited measurements can be achieved without the use of entangled states by coupling the quantum resources to a common environment that can be measured at least in part. The method is robust under decoherence, and in fact the parameter dependence of collective decoherence itself can be used to reach a 1/N scaling.
http://hdl.handle.net/2268/64251
10.1038/ncomms1220
http://www.nature.com/ncomms/index.html
See http://reflexions.ulg.ac.be/Heisenberg for a report on this work

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