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Synthesis of arbitrary, two-mode, high-visibility N-photon interference patterns
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Electronics and Quantum Optics, QEO.
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Electronics and Quantum Optics, QEO.ORCID iD: 0000-0003-2136-4914
KTH, School of Engineering Sciences (SCI), Applied Physics, Quantum Electronics and Quantum Optics, QEO.ORCID iD: 0000-0002-2082-9583
2013 (English)In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 87, no 5, 053821- p.Article in journal (Refereed) Published
Abstract [en]

Using coherent states, linear optics, and N-photon detection we demonstrate the synthesis of arbitrary interference patterns and establish that neither the shape nor the visibility of N-photon interference patterns can be used as a quantum signature in general. Specific examples include saw-curve and rectangle-curve interference patterns and phase super-resolution with period shortening of up to 60 times compared to ordinary interference. The former two have visibility close to 100% and the latter has visibility in excess of 57%.

Place, publisher, year, edition, pages
2013. Vol. 87, no 5, 053821- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-124042DOI: 10.1103/PhysRevA.87.053821ISI: 000319113300009Scopus ID: 2-s2.0-84878047338OAI: oai:DiVA.org:kth-124042DiVA: diva2:633604
Funder
Swedish Research Council, 621-2011-4575
Note

QC 20130627

Available from: 2013-06-27 Created: 2013-06-25 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Majorana Representation in Quantum Optics: SU(2) Interferometry and Uncertainty Relations
Open this publication in new window or tab >>Majorana Representation in Quantum Optics: SU(2) Interferometry and Uncertainty Relations
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The algebra of SU(2) is ubiquitous in physics, applicable both to the atomic spin states and the polarisation states of light. The method developed by Majorana and Schwinger to represent pure, symmetric spin-states of arbitrary value as a product of spin-1/2 states is a powerful tool that allows for a great conceptual and practical simplification. Foremost, it allows the representation of a qudit on the same geometry as a qubit, i.e., the Bloch sphere.

An experimental implementation of the Majorana representation in the realm of quantum optics is presented. The technique allows the projection of arbitrary quantum states from a coherent state input. It is also shown that the method can be used to synthesise arbitrary interference patterns with unit visibility, and without resorting to quantum resources. In this context, it is argued that neither the shape nor the visibility of the interference pattern is a good measure of quantumness. It is only the measurement scheme that allows for the perceived quantum behaviour.

The Majorana representation also proves useful in delineating uncertainty limits of states with a particular spin value. Issues with traditional uncertainty relations involving the SU(2) operators, such as trivial bounds for certain states and non-invariance, are thereby resolved with the presented pictorial solution.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 66 p.
Series
TRITA-FYS, ISSN 0280-316X ; 2017:25
Keyword
Majorana representation, Quantum optics, interferometry, SU(2) group, angular momentum, arbitrary optical gates
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-206222 (URN)978-91-7729-367-5 (ISBN)
Public defence
2017-05-12, FA31, AlbaNova University Center, Roslagstullsbacken 21, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20170428

Available from: 2017-04-28 Created: 2017-04-28 Last updated: 2017-04-28Bibliographically approved

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Swillo, MarcinBjörk, Gunnar

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