2017

Relations between dissipated work in non-equilibrium process andRelations between dissipated work in non-equilibrium process and the family of Rényi divergences – B.-B. Wei and M. B. Plenio,
New Journal of Physics, 19, 0023002 (2017) | ArXiv
licensed under CC BY 3.0
The gist of it

While the statistical mechanics of thermodynamical system in equilibrium is well understood and taught at undergraduate level, a similar theory for systems that are far off equilibrium has not been established yet. What is, for example, the work done when a system is pushed far away from equilibrium? Even such a seemingly, simple question that has a straightforward answer in equilibrium statistical mechanics is difficult to assess far away from equilibrium. This is a question that we consider in our work. More specifically, we link the dissipated work done on a system driven arbitrarily far from equilibrium to a concept from quantum information science, namely the family of Rényi divergences between initial and final state along the forward and reversed dynamics.

 

Universal continuous-variable quantum computation without cooling – H.-K. Lau and M. B. Plenio, Physical Review A, 95, 022303 (2017) | ArXiv

Signatures of spatially correlated noise and non-secular effects in two-dimensional electronic spectroscopy

Signatures of spatially correlated noise and non-secular effects in two-dimensional electronic spectroscopy – J. Lim, D. J. Ing, J. Rosskopf, J. Jeske, J. H. Cole, S. F. Huelga and M. B. Plenio,
J. Chem. Phys. 146, 024109 (2017)|ArXiv
The gist of it

Several competing theoretical models have been proposed to explain long-lived quantum coherences in photosynthetic complexes observed by using two-dimensional (2D) electronic spectroscopy. These models consider different vibrational structures, such as correlated fluctuations in dephasing noise and disorder induced by delocalised phonon modes coupled to several pigments, and vibronic features in phonon spectral densities induced by underdamped vibrational modes. Vibronic models have been tested both experimentally and theoretically for many biological and artificial systems, as shown in Nature Comm. 6, 7755 (2015) by our group. However, correlated fluctuation models have received little attention in the context of 2DES simulations, even though recent 2D experiments suggested the presence of correlated fluctuations in some biological and engineered molecular systems. In this work, we theoretically investigate how correlations in the noise affect 2D optical responses with the aim to identify the signatures of correlated fluctuations in 2D electronic spectra.