The Experts below are selected from a list of 4329 Experts worldwide ranked by ideXlab platform

Akihito Ishizaki - One of the best experts on this subject based on the ideXlab platform.

  • Quantum entanglement phenomena in photosynthetic light harvesting complexes
    Procedia Chemistry, 2011
    Co-Authors: K. Birgitta Whaley, Mohan Sarovar, Akihito Ishizaki
    Abstract:

    Abstract We review recent theoretical calculations of Quantum entanglement in photosynthetic light harvesting complexes. These works establish, for the first time, a manifestation of this characteristically Quantum Mechanical Phenomenon in biologically functional structures. We begin by summarizing calculations on model biomolecular systems that aim to reveal non-trivial characteristics of Quantum entanglement in non-equilibrium biological environments. We then discuss and compare several calculations performed recently of excitonic dynamics in the Fenna-Matthews-Olson light harvesting complex and of the electronic entanglement present in this widely studied pigment-protein structure. We point out the commonalities between the derived results and also identify and explain the differences. We also discuss recent work that examines entanglement in the structurally more intricate light harvesting complex II (LHCII). During this overview, we take the opportunity to clarify several subtle issues relating to entanglement in such biomolecular systems, including the role of entanglement in biological function, the complexity of dynamical modeling that is required to capture the salient features of entanglement in such biomolecular systems, and the relationship between entanglement and other Quantum Mechanical features that are observed and predicted in light harvesting complexes. Finally, we suggest possible extensions of the current work and also review the options for experimental confirmation of the predicted entanglement phenomena in light harvesting complexes.

  • Quantum entanglement phenomena in photosynthetic light harvesting complexes
    arXiv: Quantum Physics, 2010
    Co-Authors: K. Birgitta Whaley, Mohan Sarovar, Akihito Ishizaki
    Abstract:

    We review recent theoretical calculations of Quantum entanglement in photosynthetic light harvesting complexes. These works establish, for the first time, a manifestation of this characteristically Quantum Mechanical Phenomenon in biologically functional structures. We begin by summarizing calculations on model biomolecular systems that aim to reveal non-trivial characteristics of Quantum entanglement in non-equilibrium biological environments. We then discuss and compare several calculations performed recently of excitonic dynamics in the Fenna-Matthews-Olson light harvesting complex and of the entanglement present in this widely studied pigment-protein structure. We point out the commonalities between the derived results and also identify and explain the differences. We also discuss recent work that examines entanglement in the structurally more intricate light harvesting complex II (LHCII). During this overview, we take the opportunity to clarify several subtle issues relating to entanglement in such biomolecular systems, including the role of entanglement in biological function, the complexity of dynamical modeling that is required to capture the salient features of entanglement in such biomolecular systems, and the relationship between entanglement and other Quantum Mechanical features that are observed and predicted in light harvesting complexes. Finally, we suggest possible extensions of the current work and also review the options for experimental confirmation of the predicted entanglement phenomena in light harvesting complexes.

K. Birgitta Whaley - One of the best experts on this subject based on the ideXlab platform.

  • Quantum entanglement phenomena in photosynthetic light harvesting complexes
    Procedia Chemistry, 2011
    Co-Authors: K. Birgitta Whaley, Mohan Sarovar, Akihito Ishizaki
    Abstract:

    Abstract We review recent theoretical calculations of Quantum entanglement in photosynthetic light harvesting complexes. These works establish, for the first time, a manifestation of this characteristically Quantum Mechanical Phenomenon in biologically functional structures. We begin by summarizing calculations on model biomolecular systems that aim to reveal non-trivial characteristics of Quantum entanglement in non-equilibrium biological environments. We then discuss and compare several calculations performed recently of excitonic dynamics in the Fenna-Matthews-Olson light harvesting complex and of the electronic entanglement present in this widely studied pigment-protein structure. We point out the commonalities between the derived results and also identify and explain the differences. We also discuss recent work that examines entanglement in the structurally more intricate light harvesting complex II (LHCII). During this overview, we take the opportunity to clarify several subtle issues relating to entanglement in such biomolecular systems, including the role of entanglement in biological function, the complexity of dynamical modeling that is required to capture the salient features of entanglement in such biomolecular systems, and the relationship between entanglement and other Quantum Mechanical features that are observed and predicted in light harvesting complexes. Finally, we suggest possible extensions of the current work and also review the options for experimental confirmation of the predicted entanglement phenomena in light harvesting complexes.

  • Quantum entanglement phenomena in photosynthetic light harvesting complexes
    arXiv: Quantum Physics, 2010
    Co-Authors: K. Birgitta Whaley, Mohan Sarovar, Akihito Ishizaki
    Abstract:

    We review recent theoretical calculations of Quantum entanglement in photosynthetic light harvesting complexes. These works establish, for the first time, a manifestation of this characteristically Quantum Mechanical Phenomenon in biologically functional structures. We begin by summarizing calculations on model biomolecular systems that aim to reveal non-trivial characteristics of Quantum entanglement in non-equilibrium biological environments. We then discuss and compare several calculations performed recently of excitonic dynamics in the Fenna-Matthews-Olson light harvesting complex and of the entanglement present in this widely studied pigment-protein structure. We point out the commonalities between the derived results and also identify and explain the differences. We also discuss recent work that examines entanglement in the structurally more intricate light harvesting complex II (LHCII). During this overview, we take the opportunity to clarify several subtle issues relating to entanglement in such biomolecular systems, including the role of entanglement in biological function, the complexity of dynamical modeling that is required to capture the salient features of entanglement in such biomolecular systems, and the relationship between entanglement and other Quantum Mechanical features that are observed and predicted in light harvesting complexes. Finally, we suggest possible extensions of the current work and also review the options for experimental confirmation of the predicted entanglement phenomena in light harvesting complexes.

Nancy Makri - One of the best experts on this subject based on the ideXlab platform.

  • Quantum classical path integral i classical memory and weak Quantum nonlocality
    Journal of Chemical Physics, 2012
    Co-Authors: Roberto Lambert, Nancy Makri
    Abstract:

    We consider rigorous path integral descriptions of the dynamics of a Quantum system coupled to a polyatomic environment, assuming that the latter is well approximated by classical trajectories. Earlier work has derived semiclassical or purely classical expressions for the influence functional from the environment, which should be sufficiently accurate for many situations, but the evaluation of Quantum-(semi)classical path integral (QCPI) expressions has not been practical for large-scale simulation because the interaction with the environment introduces couplings nonlocal in time. In this work, we analyze the nature of the effects on a system from its environment in light of the observation [N. Makri, J. Chem. Phys. 109, 2994 (1998)] that true nonlocality in the path integral is a strictly Quantum Mechanical Phenomenon. If the environment is classical, the path integral becomes local and can be evaluated in a stepwise fashion along classical trajectories of the free solvent. This simple “classical path” limit of QCPI captures fully the decoherence of the system via a classical mechanism. Small corrections to the classical path QCPI approximation may be obtained via an inexpensive random hop QCPI model, which accounts for some “back reaction” effects. Exploiting the finite length of nonlocality, we argue that further inclusion of Quantum decoherence is possible via an iterative evaluation of the path integral. Finally, we show that the sum of the Quantum amplitude factors with respect to the system paths leads to a smooth integrand as a function of trajectory initial conditions, allowing the use of Monte Carlo methods for the multidimensional phase space integral.

Mohan Sarovar - One of the best experts on this subject based on the ideXlab platform.

  • Quantum entanglement phenomena in photosynthetic light harvesting complexes
    Procedia Chemistry, 2011
    Co-Authors: K. Birgitta Whaley, Mohan Sarovar, Akihito Ishizaki
    Abstract:

    Abstract We review recent theoretical calculations of Quantum entanglement in photosynthetic light harvesting complexes. These works establish, for the first time, a manifestation of this characteristically Quantum Mechanical Phenomenon in biologically functional structures. We begin by summarizing calculations on model biomolecular systems that aim to reveal non-trivial characteristics of Quantum entanglement in non-equilibrium biological environments. We then discuss and compare several calculations performed recently of excitonic dynamics in the Fenna-Matthews-Olson light harvesting complex and of the electronic entanglement present in this widely studied pigment-protein structure. We point out the commonalities between the derived results and also identify and explain the differences. We also discuss recent work that examines entanglement in the structurally more intricate light harvesting complex II (LHCII). During this overview, we take the opportunity to clarify several subtle issues relating to entanglement in such biomolecular systems, including the role of entanglement in biological function, the complexity of dynamical modeling that is required to capture the salient features of entanglement in such biomolecular systems, and the relationship between entanglement and other Quantum Mechanical features that are observed and predicted in light harvesting complexes. Finally, we suggest possible extensions of the current work and also review the options for experimental confirmation of the predicted entanglement phenomena in light harvesting complexes.

  • Quantum entanglement phenomena in photosynthetic light harvesting complexes
    arXiv: Quantum Physics, 2010
    Co-Authors: K. Birgitta Whaley, Mohan Sarovar, Akihito Ishizaki
    Abstract:

    We review recent theoretical calculations of Quantum entanglement in photosynthetic light harvesting complexes. These works establish, for the first time, a manifestation of this characteristically Quantum Mechanical Phenomenon in biologically functional structures. We begin by summarizing calculations on model biomolecular systems that aim to reveal non-trivial characteristics of Quantum entanglement in non-equilibrium biological environments. We then discuss and compare several calculations performed recently of excitonic dynamics in the Fenna-Matthews-Olson light harvesting complex and of the entanglement present in this widely studied pigment-protein structure. We point out the commonalities between the derived results and also identify and explain the differences. We also discuss recent work that examines entanglement in the structurally more intricate light harvesting complex II (LHCII). During this overview, we take the opportunity to clarify several subtle issues relating to entanglement in such biomolecular systems, including the role of entanglement in biological function, the complexity of dynamical modeling that is required to capture the salient features of entanglement in such biomolecular systems, and the relationship between entanglement and other Quantum Mechanical features that are observed and predicted in light harvesting complexes. Finally, we suggest possible extensions of the current work and also review the options for experimental confirmation of the predicted entanglement phenomena in light harvesting complexes.

A N Slavin - One of the best experts on this subject based on the ideXlab platform.

  • bose einstein condensation in an ultra hot gas of pumped magnons
    Nature Communications, 2014
    Co-Authors: A A Serga, Dmytro A. Bozhko, Vasil Tiberkevich, C W Sandweg, V I Vasyuchka, A V Chumak, Timo Neumann, Bjorn Obry, Gennadii A Melkov, A N Slavin
    Abstract:

    Bose-Einstein condensation of quasi-particles such as excitons, polaritons, magnons and photons is a fascinating Quantum Mechanical Phenomenon. Unlike the Bose-Einstein condensation of real particles (like atoms), these processes do not require low temperatures, since the high densities of low-energy quasi-particles needed for the condensate to form can be produced via external pumping. Here we demonstrate that such a pumping can create remarkably high effective temperatures in a narrow spectral region of the lowest energy states in a magnon gas, resulting in strikingly unexpected transitional dynamics of Bose-Einstein magnon condensate: the density of the condensate increases immediately after the external magnon flow is switched off and initially decreases if it is switched on again. This behaviour finds explanation in a nonlinear 'evaporative supercooling' mechanism that couples the low-energy magnons overheated by pumping with all the other thermal magnons, removing the excess heat, and allowing Bose-Einstein condensate formation.