Macroscopic quantum effects based on Kerr nonlinearities
| atmire.migration.oldid | 2655 | |
| dc.contributor.advisor | Simon, Christoph | |
| dc.contributor.author | Wang, Tian | |
| dc.date.accessioned | 2014-09-30T19:51:44Z | |
| dc.date.available | 2014-11-17T08:00:51Z | |
| dc.date.issued | 2014-09-30 | |
| dc.date.submitted | 2014 | en |
| dc.description.abstract | Glorious victories have been achieved when quantum theory (QT) is applied to microscopic systems. However, although there might be good reasons for us to believe that QT applies at the macroscopic level as well, to give a definite answer ”yes” there is still a long journey. If it does apply, a direct result is that it predicts highly counter-intuitive macroscopic quantum superpositions and entanglements, which we never experience in our daily lives. In this thesis we assume that QT applies to the macroscopic level, and try to find out why we never really observe macroscopic quantum effects. The thesis contains two projects, aiming at two reasons for the above problem. In the first project (Chapter 3 and 4), we show that the required resolution to observe macroscopic quantum effects increases with the size of the system, when both outcome precision and control precision are taken into account. This means that for really large quantum effects we need a very good measuring resolution to observe them, while what we usually do are coarse-grained measurements, whose resolutions are much lower. In the second project (Chapter 5), we try to deal with decoherence, another obstacle preventing us from observing macroscopic quantum effects. We propose to create and detect strong entanglement of micro-macro and macro-macro beams of photons with very weak cross Kerr nonlinearities that are obtainable by current technology. We analyze the entanglement under environmental decoherence with various methods, and show that strong entanglement can still be created and detected under decoherence. We hope that the above results will help to push the boundary of the realm of QT towards the macroscopic level. | en_US |
| dc.identifier.citation | Wang, T. (2014). Macroscopic quantum effects based on Kerr nonlinearities (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/26808 | en_US |
| dc.identifier.doi | http://dx.doi.org/10.11575/PRISM/26808 | |
| dc.identifier.uri | http://hdl.handle.net/11023/1858 | |
| dc.language.iso | eng | |
| dc.publisher.faculty | Graduate Studies | |
| dc.publisher.institution | University of Calgary | en |
| dc.publisher.place | Calgary | en |
| dc.rights | University of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission. | |
| dc.subject | Physics--Theory | |
| dc.subject.classification | Entanglement | en_US |
| dc.subject.classification | kerr nonlinearities | en_US |
| dc.subject.classification | Quantum Information | en_US |
| dc.subject.classification | Quantum Optics | en_US |
| dc.subject.classification | macroscopic quantum effect | en_US |
| dc.subject.classification | quantum physics | en_US |
| dc.subject.classification | decoherence | en_US |
| dc.subject.classification | coarse grained measurements | en_US |
| dc.subject.classification | outcome precision | en_US |
| dc.subject.classification | control precision | en_US |
| dc.title | Macroscopic quantum effects based on Kerr nonlinearities | |
| dc.type | master thesis | |
| thesis.degree.discipline | Physics and Astronomy | |
| thesis.degree.grantor | University of Calgary | |
| thesis.degree.name | Master of Science (MSc) | |
| ucalgary.item.requestcopy | true |