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Francoise Remacle - One of the best experts on this subject based on the ideXlab platform.

  • Quantum Phenomena in nanomaterials coherent superpositions of fine structure states in cdse nanocrystals at room temperature
    Journal of Physical Chemistry C, 2019
    Co-Authors: Elisabetta Collini, Hugo Gattuso, Luca Bolzonello, Andrea Casotto, Andrea Volpato, Carlo Nazareno Dibenedetto, Elisabetta Fanizza, Marinella Striccoli, Francoise Remacle
    Abstract:

    One of the most recent developments at the forefront of nanotechnology is the attempt to exploit Quantum Phenomena in nanometer scale materials, exploring novel applications of Quantum effects. An ...

  • Quantum Phenomena in nanomaterials coherent superpositions of fine structure states in cdse nanocrystals at room temperature
    The Journal of Physical Chemistry, 2019
    Co-Authors: Elisabetta Collini, Hugo Gattuso, Luca Bolzonello, Andrea Casotto, Andrea Volpato, Carlo Nazareno Dibenedetto, Elisabetta Fanizza, Marinella Striccoli, Francoise Remacle
    Abstract:

    One of the most recent developments at the forefront of nanotechnology is the attempt to exploit Quantum Phenomena in nanometer scale materials, exploring novel applications of Quantum effects. An effective exploitation of Quantum Phenomena must necessarily pass through a deep understanding of how to generate, manipulate, and characterize coherent superposition of Quantum states in the nanosystems. However, despite the lively interest in this topic, the study of coherent effects in nanomaterials still represents relatively unexplored territory. Here we report an investigation on the ultrafast coherent dynamics of colloidal CdSe Quantum dots (QDs) by the mean of two-dimensional electronic spectroscopy (2DES). The time evolution of specific coherent superpositions of fine structure levels in these nanomaterials is clearly demonstrated. The obtained results represent an important step forward toward a deeper understanding of Quantum properties of nanomaterials.

Elisabetta Collini - One of the best experts on this subject based on the ideXlab platform.

  • Quantum Phenomena in nanomaterials coherent superpositions of fine structure states in cdse nanocrystals at room temperature
    Journal of Physical Chemistry C, 2019
    Co-Authors: Elisabetta Collini, Hugo Gattuso, Luca Bolzonello, Andrea Casotto, Andrea Volpato, Carlo Nazareno Dibenedetto, Elisabetta Fanizza, Marinella Striccoli, Francoise Remacle
    Abstract:

    One of the most recent developments at the forefront of nanotechnology is the attempt to exploit Quantum Phenomena in nanometer scale materials, exploring novel applications of Quantum effects. An ...

  • Quantum Phenomena in nanomaterials coherent superpositions of fine structure states in cdse nanocrystals at room temperature
    The Journal of Physical Chemistry, 2019
    Co-Authors: Elisabetta Collini, Hugo Gattuso, Luca Bolzonello, Andrea Casotto, Andrea Volpato, Carlo Nazareno Dibenedetto, Elisabetta Fanizza, Marinella Striccoli, Francoise Remacle
    Abstract:

    One of the most recent developments at the forefront of nanotechnology is the attempt to exploit Quantum Phenomena in nanometer scale materials, exploring novel applications of Quantum effects. An effective exploitation of Quantum Phenomena must necessarily pass through a deep understanding of how to generate, manipulate, and characterize coherent superposition of Quantum states in the nanosystems. However, despite the lively interest in this topic, the study of coherent effects in nanomaterials still represents relatively unexplored territory. Here we report an investigation on the ultrafast coherent dynamics of colloidal CdSe Quantum dots (QDs) by the mean of two-dimensional electronic spectroscopy (2DES). The time evolution of specific coherent superpositions of fine structure levels in these nanomaterials is clearly demonstrated. The obtained results represent an important step forward toward a deeper understanding of Quantum properties of nanomaterials.

Armond Duwell - One of the best experts on this subject based on the ideXlab platform.

  • Understanding Quantum Phenomena and Quantum theories
    Studies in History and Philosophy of Science Part B: Studies in History and Philosophy of Modern Physics, 2020
    Co-Authors: Armond Duwell
    Abstract:

    Abstract In this paper I examine the extent to which recent work in information-theoretic foundations of Quantum mechanics can be thought to facilitate understanding, either of Quantum Phenomena or Quantum theory. To do so I utilize the modal view of understanding Phenomena. I extend this view to develop an analysis of understanding of theories. The extended modal view of understanding provides a unified view of recent work in information-theoretic foundations of Quantum mechanics and explains how it facilitates understanding.

Herschel Rabitz - One of the best experts on this subject based on the ideXlab platform.

  • General unifying features of controlled Quantum Phenomena
    Physical Review A, 2010
    Co-Authors: Alexander Pechen, Constantin Brif, Raj Chakrabarti, Herschel Rabitz
    Abstract:

    Many proposals have been put forth for controlling Quantum Phenomena, including open-loop, adaptive feedback, and real-time feedback control. Each of these approaches has been viewed as operationally, and even physically, distinct from the others. This work shows that all such scenarios inherently share the same fundamental control features residing in the topology of the landscape relating the target physical observable to the applied controls. This unified foundation may provide a basis for development of hybrid control schemes that would combine the advantages of the existing approaches to achieve the best overall performance.

  • control of Quantum Phenomena past present and future
    New Journal of Physics, 2010
    Co-Authors: Constantin Brif, Raj Chakrabarti, Herschel Rabitz
    Abstract:

    Quantum control is concerned with active manipulation of physical and chemical processes on the atomic and molecular scale. This work presents a perspective of progress in the field of control over Quantum Phenomena, tracing the evolution of theoretical concepts and experimental methods from early developments to the most recent advances. Among numerous theoretical insights and technological improvements that produced the present state-of- the-art in Quantum control, there have been several breakthroughs of foremost importance. On the technology side, the current experimental successes would be impossible without the development of intense femtosecond laser sources and pulse shapers. On the theory side, the two most critical insights were (i) realizing that ultrafast atomic and molecular dynamics can be controlled via manipulation of Quantum interferences and (ii) understanding that optimally shaped ultrafast laser pulses are the most effective means for producing the desired Quantum interference patterns in the controlled system. Finally, these theoretical and experimental advances were brought together by the crucial concept of adaptive feedback control (AFC), which is a laboratory procedure employing measurement-driven, closed-loop optimization to identify the best shapes of femtosecond laser control pulses for steering Quantum dynamics towards the desired objective. Optimization in AFC experiments is guided by a learning algorithm, with stochastic methods proving to be especially effective. AFC of Quantum Phenomena has found numerous applications in many areas of the physical and chemical sciences, and this paper reviews the extensive experiments. Other subjects discussed include Quantum optimal control theory, Quantum control landscapes, the role of theoretical control

  • control of Quantum Phenomena past present and future
    arXiv: Quantum Physics, 2009
    Co-Authors: Constantin Brif, Raj Chakrabarti, Herschel Rabitz
    Abstract:

    Quantum control is concerned with active manipulation of physical and chemical processes on the atomic and molecular scale. This work presents a perspective of progress in the field of control over Quantum Phenomena, tracing the evolution of theoretical concepts and experimental methods from early developments to the most recent advances. The current experimental successes would be impossible without the development of intense femtosecond laser sources and pulse shapers. The two most critical theoretical insights were (1) realizing that ultrafast atomic and molecular dynamics can be controlled via manipulation of Quantum interferences and (2) understanding that optimally shaped ultrafast laser pulses are the most effective means for producing the desired Quantum interference patterns in the controlled system. Finally, these theoretical and experimental advances were brought together by the crucial concept of adaptive feedback control, which is a laboratory procedure employing measurement-driven, closed-loop optimization to identify the best shapes of femtosecond laser control pulses for steering Quantum dynamics towards the desired objective. Optimization in adaptive feedback control experiments is guided by a learning algorithm, with stochastic methods proving to be especially effective. Adaptive feedback control of Quantum Phenomena has found numerous applications in many areas of the physical and chemical sciences, and this paper reviews the extensive experiments. Other subjects discussed include Quantum optimal control theory, Quantum control landscapes, the role of theoretical control designs in experimental realizations, and real-time Quantum feedback control. The paper concludes with a prospective of open research directions that are likely to attract significant attention in the future.

  • Controlling Quantum Phenomena with photonic reagents
    Theory and Applications of Computational Chemistry, 2005
    Co-Authors: Herschel Rabitz
    Abstract:

    Publisher Summary The efforts at controlling molecular dynamics and other Quantum Phenomena with lasers have a history going back to the early 1960s. This quest has followed a torturous evolution, but recent years have seen dramatic successes beginning to emerge. These laboratory advances utilize shaped ultra-fast laser pulses as a special class of photonic reagents having a fleeting existence, but with the capability of permanently altering molecules and materials in specific ways. Theoretical concepts and modeling are providing the basis for directing and analyzing the experiments. Although the attempts at photonic reagent control of Quantum dynamics is a subject with a 40-year history, the field may be viewed as just a few years young given only the recent emergence of successful experiments on physically and chemically interesting systems. It is anticipated that theory and modeling will continue to play leading roles in the further development of this field.

  • Whither the future of controlling Quantum Phenomena
    Science (New York N.Y.), 2000
    Co-Authors: Herschel Rabitz, Regina De Vivie-riedle, Marcus Motzkus, Karl L. Kompa
    Abstract:

    This review puts into perspective the present state and prospects for controlling Quantum Phenomena in atoms and molecules. The topics considered include the nature of physical and chemical control objectives, the development of possible Quantum control rules of thumb, the theoretical design of controls and their laboratory realization, Quantum learning and feedback control in the laboratory, bulk media influences, and the ability to utilize coherent Quantum manipulation as a means for extracting microscopic information. The preview of the field presented here suggests that important advances in the control of molecules and the capability of learning about molecular interactions may be reached through the application of emerging theoretical concepts and laboratory technologies.

Howard M. Wiseman - One of the best experts on this subject based on the ideXlab platform.

  • Quantum Phenomena modelled by interactions between many classical worlds
    Physical Review X, 2014
    Co-Authors: Michael J. W. Hall, Dirk-andré Deckert, Howard M. Wiseman
    Abstract:

    We investigate whether Quantum theory can be understood as the continuum limit of a mechanical theory, in which there is a huge, but finite, number of classical 'worlds', and Quantum effects arise solely from a universal interaction between these worlds, without reference to any wave function. Here a `world' means an entire universe with well-defined properties, determined by the classical configuration of its particles and fields. In our approach each world evolves deterministically; probabilities arise due to ignorance as to which world a given observer occupies; and we argue that in the limit of infinitely many worlds the wave function can be recovered (as a secondary object) from the motion of these worlds. We introduce a simple model of such a 'many interacting worlds' approach and show that it can reproduce some generic Quantum Phenomena---such as Ehrenfest's theorem, wavepacket spreading, barrier tunneling and zero point energy---as a direct consequence of mutual repulsion between worlds. Finally, we perform numerical simulations using our approach. We demonstrate, first, that it can be used to calculate Quantum ground states, and second, that it is capable of reproducing, at least qualitatively, the double-slit interference phenomenon.