2,053 research outputs found
Scattering into one-dimensional waveguides from a coherently-driven quantum-optical system
We develop a new computational tool and framework for characterizing the
scattering of photons by energy-nonconserving Hamiltonians into unidirectional
(chiral) waveguides, for example, with coherent pulsed excitation. The temporal
waveguide modes are a natural basis for characterizing scattering in quantum
optics, and afford a powerful technique based on a coarse discretization of
time. This overcomes limitations imposed by singularities in the
waveguide-system coupling. Moreover, the integrated discretized equations can
be faithfully converted to a continuous-time result by taking the appropriate
limit. This approach provides a complete solution to the scattered photon field
in the waveguide, and can also be used to track system-waveguide entanglement
during evolution. We further develop a direct connection between quantum
measurement theory and evolution of the scattered field, demonstrating the
correspondence between quantum trajectories and the scattered photon state. Our
method is most applicable when the number of photons scattered is known to be
small, i.e. for a single-photon or photon-pair source. We illustrate two
examples: analytical solutions for short laser pulses scattering off a
two-level system and numerically exact solutions for short laser pulses
scattering off a spontaneous parametric downconversion (SPDC) or spontaneous
four-wave mixing (SFWM) source. Finally, we note that our technique can easily
be extended to systems with multiple ground states and generalized scattering
problems with both finite photon number input and coherent state drive,
potentially enhancing the understanding of, e.g., light-matter entanglement and
photon phase gates.Comment: Numerical package in collaboration with Ben Bartlett (Stanford
University), implemented in QuTiP: The Quantum Toolbox in Python, Quantum
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Research of the development of the constitutive elements of the profession of the engineering manager
U disertacija se istražuje proces profesionalizacije nove profesije inženjer menadžment u savremenom srpskom društvu. Cilj je da se ispita koji su konstitutivni elementi razvijeni, koji još nisu ili nisu u potpunosti, te ih treba razvijati kako bi se ubrzali procesi profesionalizacije. Teorijski model primenjen u istraživanju sastoji se od elemenata strukturano-funkcionalističke teorije (društvena zaštita profesije i etički kodeks) i realističko-istorijske teorije (formiranje škola za profesionalno obrazovanje, profesionalno udruženje i izgradnja etičkog kodeksa profesije). Model je za potrebe ovog istraživanja proširen sa još dva relevantna elementa: resocijalizacija inženjera menadžmentau organizacijama i društveno vrednovanje profesije. Rezultati istraživanja dokazuju relevantnost izabranih nezavisnih promenljivih i potvrđuju njihov determinirajući uticaj na procese profesionalizacije profesije inženjer menadžmenta. Kao najrazvijeniji elemenat ove mlade profesije identifikovano je univerzitetsko obrazovanje. To pokazuje da je uvođenje studijskih programa inženjerskog menadžmenta na univerzitete u Srbiji prethodnica ekonomskog razvoja.The thesis focuses on the research of the process of the professionalization of the engineering manager profession in the contemporary Serbina society. The main objective is to examine which of the constitutive elements of this profession are developed and which of those are yet to be developed. The theoretical model applied in the research consists of the elements of the structural-functional theory (social protection of profession and ethical code) and realistic-historical theory (founding of the schools for professional education, professional associations, and establishment of the ethical code for the profession). This model was, for the needs of this research, broadened with two more relevant elements: re-socialization of the engineering managers in and social evaluation of the profession of the engineering manager. The results of the research prove the relevance of the examined factors and confirm their determining influence on the process of the professionalization of the engineering manager profession. As the most developed element of this young profession, the university education was identified. This shows that introduction of the study programme of engineering management in Serbia by the universities was in fact preceding the economic development
Research of the development of the constitutive elements of the profession of the engineering manager
U disertacija se istražuje proces profesionalizacije nove profesije inženjer menadžment u savremenom srpskom društvu. Cilj je da se ispita koji su konstitutivni elementi razvijeni, koji još nisu ili nisu u potpunosti, te ih treba razvijati kako bi se ubrzali procesi profesionalizacije. Teorijski model primenjen u istraživanju sastoji se od elemenata strukturano-funkcionalističke teorije (društvena zaštita profesije i etički kodeks) i realističko-istorijske teorije (formiranje škola za profesionalno obrazovanje, profesionalno udruženje i izgradnja etičkog kodeksa profesije). Model je za potrebe ovog istraživanja proširen sa još dva relevantna elementa: resocijalizacija inženjera menadžmentau organizacijama i društveno vrednovanje profesije. Rezultati istraživanja dokazuju relevantnost izabranih nezavisnih promenljivih i potvrđuju njihov determinirajući uticaj na procese profesionalizacije profesije inženjer menadžmenta. Kao najrazvijeniji elemenat ove mlade profesije identifikovano je univerzitetsko obrazovanje. To pokazuje da je uvođenje studijskih programa inženjerskog menadžmenta na univerzitete u Srbiji prethodnica ekonomskog razvoja.The thesis focuses on the research of the process of the professionalization of the engineering manager profession in the contemporary Serbina society. The main objective is to examine which of the constitutive elements of this profession are developed and which of those are yet to be developed. The theoretical model applied in the research consists of the elements of the structural-functional theory (social protection of profession and ethical code) and realistic-historical theory (founding of the schools for professional education, professional associations, and establishment of the ethical code for the profession). This model was, for the needs of this research, broadened with two more relevant elements: re-socialization of the engineering managers in and social evaluation of the profession of the engineering manager. The results of the research prove the relevance of the examined factors and confirm their determining influence on the process of the professionalization of the engineering manager profession. As the most developed element of this young profession, the university education was identified. This shows that introduction of the study programme of engineering management in Serbia by the universities was in fact preceding the economic development
Few-particle scattering from localized quantum systems in spatially structured bosonic baths
Understanding dynamics of localized quantum systems embedded in engineered
bosonic environments is a central problem in quantum optics and open quantum
system theory. We present a formalism for studying few-particle scattering from
a localized quantum system interacting with an bosonic bath described by an
inhomogeneous wave-equation. In particular, we provide exact relationships
between the quantum scattering matrix of this interacting system and frequency
domain solutions of the inhomogeneous wave-equation thus providing access to
the spatial distribution of the scattered few-particle wave-packet. The
formalism developed in this paper paves the way to computationally
understanding the impact of structured media on the scattering properties of
localized quantum systems embedded in them without simplifying assumptions on
the physics of the structured media
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