| 1. |
- Björk, Gunnar, et al.
(författare)
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Quantum degrees of polarization
- 2010
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Ingår i: Optics Communications. - : Elsevier BV. - 0030-4018 .- 1873-0310. ; 283:22, s. 4440-4447
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Tidskriftsartikel (refereegranskat)abstract
- We discuss different proposals for the degree of polarization of quantum fields. The simplest approach, namely making a direct analogy with the classical description via the Stokes operators, is known to produce unsatisfactory results. Still, we argue that these operators and their properties should be basic for any measure of polarization. We compare alternative quantum degrees and put forth that they order various states differently. This is to be expected, since, despite being rooted in the Stokes operators, each of these measures only captures certain characteristics. Therefore, it is likely that several quantum degrees of polarization will coexist, each one having its specific domain of usefulness.
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| 2. |
- Ghiu, Iulia, et al.
(författare)
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Probing light polarization with the quantum Chernoff bound
- 2010
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Ingår i: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622. ; 82:2, s. 023803-
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Tidskriftsartikel (refereegranskat)abstract
- We recall the framework of a consistent quantum description of polarization of light. Accordingly, the degree of polarization of a two-mode state. (rho) over cap of the quantum radiation field can be defined as a distance of a related state (rho) over cap (b) to the convex set of all SU(2)-invariant two-mode states. We explore a distance-type polarization measure in terms of the quantum Chernoff bound and derive its explicit expression. A comparison between the Chernoff and Bures degrees of polarization leads to interesting conclusions for some particular states chosen as illustrative examples.
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| 3. |
- Widen, Cecilia, et al.
(författare)
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Systemic inflammatory impact of periodontitis on acute coronary syndrome
- 2016
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Ingår i: Journal of Clinical Periodontology. - : Wiley. - 0303-6979 .- 1600-051X. ; 43:9, s. 713-719
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Tidskriftsartikel (refereegranskat)abstract
- AimA causative relationship between acute coronary syndrome (ACS) and periodontitis has yet to be defined. The aim of this study was to assess differences in levels of serum cytokines between individuals with or without ACS or periodontal comorbidity. Material and MethodsIn a case-control study, individuals with ACS (78 individuals, 10.3% females) and matching healthy controls (78 individuals, 28.2% females) were included. Medical and dental examinations were performed to diagnose ACS and periodontitis. Serum levels of cytokines were assessed, using Luminex technology. ResultsA diagnosis of periodontitis in the ACS and control group was diagnosed in 52.6% and 12.8% of the individuals, respectively. The unadjusted odds-ratio that individuals with ACS also had periodontitis was 7.5 (95% CI: 3.4, 16.8, p<0.001). Independent of periodontal conditions, individuals with ACS had significantly higher serum levels of IL8 (mean: 44.3 and 40.0pg/ml) and vascular endothelial growth factor (VEGF) (mean: 82.3 and 55.3pg/ml) than control individuals. A diagnosis of periodontitis made no difference in serum cytokine expressions. ConclusionElevated serum levels of VEGF were associated with ACS. Serum cytokine expression in individuals with ACS is unrelated to periodontal conditions.
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