Sekatski, Pavel and Sangouard, Nicolas and Gisin, Nicolas. (2014) Size of quantum superpositions as measured with classical detectors. Phys. Rev. A, 89. 012116.
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Official URL: http://edoc.unibas.ch/51225/
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Abstract
We propose a criterion which defines whether a superposition of two photonic components is macroscopic. It is based on the ability to discriminate these components with a particular class of “classical” detectors, namely, a photon number measurement with a resolution coarse-grained by noise. We show how our criterion can be extended to a measure of the size of macroscopic superpositions by quantifying the amount of noise that can be tolerated and taking the distinctness of two Fock states differing by N photons as a reference. After applying our measure to several well-known examples, we demonstrate that the superpositions which meet our criterion are very sensitive to phase fluctuations. This suggests that quantifying the macroscopicity of a superposition state through the distinguishability of its components with “classical” detectors not only is a natural measure but also explains why it is difficult to observe superpositions at the macroscopic scale.
Faculties and Departments: | 05 Faculty of Science > Departement Physik > Former Organization Units Physics > Quantum Physics (Sangouard) |
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UniBasel Contributors: | Sangouard, Nicolas |
Item Type: | Article, refereed |
Article Subtype: | Research Article |
Publisher: | American Physical Society |
ISSN: | 2469-9926 |
e-ISSN: | 2469-9934 |
Note: | Publication type according to Uni Basel Research Database: Journal article |
Identification Number: | |
Last Modified: | 13 Feb 2017 12:48 |
Deposited On: | 13 Feb 2017 12:48 |
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