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Schrödinger-cat states: size classification based on evolution or dissipation
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.ORCID iD: 0000-0002-2082-9583
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
2004 (English)In: Proceedings of SPIE - The International Society for Optical Engineering: Vol. 5468 / [ed] Heszler P; Abbott D; GeaBanacloche JR; Hemmer PR, 2004, 335-343 p.Conference paper, Published paper (Refereed)
Abstract [en]

The issue of estimating how "macroscopic" a superposition state is, can be addressed by analysing the rapidity of the state's evolution under a preferred observable, compared to that of the states forming the superposition. This fast evolution. which arises from the larger dispersion of the superposition state for the preferred operator, also represents a useful characteristic for interferometric applications. This approach can be compared to others in which a superposition's macroscopality is estimated in terms of the fragility to dissipation.

Place, publisher, year, edition, pages
2004. 335-343 p.
Series
Proceedings of SPIE, ISSN 0277-786X
Keyword [en]
Disconnectivity; Interference; Macroscopic superpositions; Schrödinger-cat states; Dispersion (waves); Interferometry; Mathematical models; Microwaves; Photons; Probability distributions; Thermodynamics; Quantum theory
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-7281DOI: 10.1117/12.547048ISI: 000223225300035Scopus ID: 2-s2.0-4344689602ISBN: 0-8194-5391-9 (print)OAI: oai:DiVA.org:kth-7281DiVA: diva2:12243
Conference
Fluctuations and Noise in Photonics and Quantum Optics II; Maspalomas; 26-28 May 2004, Maspalomas, Spain
Note
QC 20100816Available from: 2007-06-04 Created: 2007-06-04 Last updated: 2011-11-02Bibliographically approved
In thesis
1. Studies in plausibility theory, with applications to physics
Open this publication in new window or tab >>Studies in plausibility theory, with applications to physics
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The discipline usually called `probability theory' can be seen as the theory which describes and sets standard norms to the way we reason about plausibility. From this point of view, this `plausibility theory' is a province of logic, and the following informal proportion subsists:

plausibility theory is to the common notion of `plausibility', as deductive logic is to the common notion of `truth'.

Some studies in plausibility theory are here offered. An alternative view and mathematical formalism for the problem of induction (the prediction of uncertain events from similar, certain ones) is presented. It is also shown how from plausibility theory one can derive a mathematical framework, based on convex geometry, for the description of the predictive properties of physical theories. Within this framework, problems like state assignment - for any physical theory - find simple and clear algorithms, numerical examples of which are given for three-level quantum systems. Plausibility theory also gives insights on various fashionable theorems, like Bell’s theorem, and various fashionable `paradoxes', like Gibbs' paradox.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. xv, 105 p.
Series
Trita-ICT/MAP, 2007:6
Keyword
Bayesian probability theory, quantum theory, state assignment, state estimation
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-4421 (URN)978-91-7178-688-3 (ISBN)
Public defence
2007-06-12, D, Forum, Isafjordsgatan 39, Kista, 10:00
Opponent
Supervisors
Note
QC 20100816Available from: 2007-06-04 Created: 2007-06-04 Last updated: 2010-08-16Bibliographically approved

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Björk, Gunnar

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