Vibration-induced coherence enhancement of the performance of a biological quantum heat engine

Chen, Hong Bin; Chiu, Pin Yi; Chen, Yueh-Nan

doi:10.1103/physreve.94.052101

Cited by 36 publications

(39 citation statements)

References 47 publications

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“…Other applications might come out in other thermodynamical problems, light-harvesting devices [17][18][19][20][21][22][23][24][25][26][27] using for instance superabsoption [28], but also possibly in quantum biology [34], particularly in light-harvesting complexes [20,31,[33][34][35][36][37]. The non-thermality of the local states (for s ≥ 1) shown in Section V D is a valuable resource [46,72] which can find interesting applications in some thermodynamic or computational tasks.…”

Section: B More Applicationsmentioning

confidence: 99%

Thermodynamics from indistinguishability: Mitigating and amplifying the effects of the bath

Latune

Sinayskiy

Petruccione

2019

Phys. Rev. Research

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Rich quantum effects emerge when several quantum systems are indistinguishable from the point of view of the bath they interact with. In particular, delocalised excitations corresponding to coherent superposition of excited states (reminiscent of double slit experiments or beam splitters in interferometers) appear and change drastically the dynamics and steady state of the systems. Such phenomena, which are central mechanisms of superradiance, present interesting properties for thermodynamics and potentially other quantum technologies. Indeed, a recent paper [C.L. Latune, I. Sinayskiy, F. Petruccione, Phys. Rev. A 99, 052105 (2019)] studies these properties in a pair of indistinguishable two-level systems and points out surprising effects of mitigation and amplification of the bath's action on the energy and entropy of the pair. Here, we generalise the study to ensembles of arbitrary number of spins of arbitrary size. We confirm that the previously uncovered mitigation and amplification effects remain, but also that they become more and more pronounced with growing number of spin and growing spin size. Moreover, we also investigate the free energy and the entropy production of the overall dissipation process and find dramatic reductions of irreversibility. The possibility of mitigating or amplifying the effects of the baths is highly desirable in quantum thermodynamics if one wants to optimise the use of the baths to enhance the performance of thermodynamic tasks. As illustrative application of these effects, we show explicitly the large power enhancements that can be obtained in cyclic thermal machines. The reduction of irreversibility is also a promising aspect since irreversibility is known to limit the performance of thermal machines. Beyond thermodynamics, the above findings might lead to interesting applications in state protection, quantum computational tasks, light harvesting devices, quantum biology, but also for the study of entropy production. Moreover, an experimental observation [J. M. Raimond, P. Goy, M. Gross, C. Fabre, and S. Haroche, Phys. Rev. Lett. 49, 117 (1982)] confirms that such effects are indeed within reach.observables J z and J 2 := J 2 x + J 2 y + J 2 z . Such eigenvectors are denoted by |J, m in reference to their associated eigenvalues,with −J ≤ m ≤ J and J ∈ [J 0 ; ns], where J 0 = 0 if s ≥ 1 and J 0 = 1/2 if s = 1/2 and n odd. A quick calculation shows that the natural basis contains (2s + 1) n elements whereas there are only (ns + 1) 2 (or (ns + 1/2)(ns + 3/2) when s = 1/2 and n is odd) different eigenvectors of J z and J 2 satisfying −J ≤ m ≤ J and J ∈ [J 0 ; ns]. Therefore, for n ≥ 3 degeneracies appear (some eigenvectors |J, m are repeated), meaning that different linear combinations of elements of the local basis |m 1 , ..., m n result in eigenstates of J z and J 2 with same eigenvalue J (total spin) and m (z-component of the spin). Then, we denote by |J, m i the degenerate eigenstates of J z and J 2 where the degeneracy index i runs from 1 to l J , integer which represents th...

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Section: B More Applicationsmentioning

confidence: 99%

Thermodynamics from indistinguishability: Mitigating and amplifying the effects of the bath

Latune

Sinayskiy

Petruccione

2019

Phys. Rev. Research

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“…The assumption of high-photon irradiation temperature [20][21][22]27,31 does not occur with natural sunlight. Thus, we also examine, in IV B, the lowtemperature photon irradiation case, with parameters corresponding to more realistic, but optimally concentrated, natural sunlight irradiation.…”

Section: A Summary Of Resultsmentioning

confidence: 99%

“…This suggests that there are regimes where a structured environment can enhance the current. However, further optimizing this current, beyond the range shown in the figure, requires us to enter regime that exceeds the limits of our numerical RC method, and may be more amenable to methods used in other works 31,33 . In addition, it should be noted that, as we tune far off resonance in figure 3, for the very narrow bath γ = 0.01Ω 0 , numerical convergence in the phonon Fock-space becomes difficult, and the observed current should only be considered as a lower bound.…”

Section: A Suppression Of Currentmentioning

confidence: 99%

Optimizing co-operative multi-environment dynamics in a dark-state-enhanced photosynthetic heat engine

Wertnik

Chin

Nori

et al. 2018

The Journal of Chemical Physics

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We analyze the role of coherent, non-perturbative system-bath interactions in a photosynthetic heat engine. Using the reaction-coordinate formalism to describe the vibrational phonon-environment in the engine, we analyze the efficiency around an optimal parameter regime predicted in earlier studies. We show that, in the limit of high-temperature photon irradiation, the phonon-assisted population transfer between bright and dark states is suppressed due to dephasing from the photon environment, even in the Markov limit where we expect the influence of each bath to have an independent and additive effect on the dynamics. Manipulating the phonon bath properties via its spectral density enables us to identify both optimal low- and high-frequency regimes where the suppression can be removed. This suppression of transfer and its removal suggests that it is important to consider carefully the non-perturbative and cooperative effects of system-bath environments in designing artificial photosynthetic systems and also that manipulating inter-environmental interactions could provide a new multidimensional "lever" by which photocells and other types of quantum devices can be optimized.

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“…Experiments capable of addressing single PPCs or nanostructures have been demonstrated, but are typically restricted to certain probes, such as fluorescence [22,23]. At the same time, theoretical studies also point to a very wide range of electronic and environmental factors that can contribute to rapid and directed EET, among which the roles of nonperturbative and non-Markovian vibrational dephasing noise, and electronic disorder, are particularly important [3,[24][25][26][27][28][29][30][31][32]. To take these latter features into account requires advanced and numerically expensive computational techniques for simulating open quantum dynamics [3,8,[33][34][35][36][37][38][39][40][41][42][43][44][45][46], and inclusion of the full quantum mechanics of the PPC light-matter interaction adds enormously to this problem.…”

Section: Introductionmentioning

confidence: 99%

Role of the multiple-excitation manifold in a driven quantum simulator of an antenna complex

et al. 2020

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Biomolecular light-harvesting antennas operate as nanoscale devices in a regime where the coherent interactions of individual light, matter, and vibrational quanta are nonperturbatively strong. The complex behavior arising from this could, if fully understood, be exploited for myriad energy applications. However, nonperturbative dynamics are computationally challenging to simulate, and experiments on biomaterials explore very limited regions of the nonperturbative parameter space. So-called quantum simulators of light-harvesting models could provide a solution to this problem, and here we employ the hierarchical equations-of-motion technique to investigate the recent superconducting experiments of Potočnik et al. [A. Potočnik et al., Nat. Commun. 9, 904 (2018)] used to explore excitonic energy capture. By explicitly including the role of optical driving fields, nonperturbative dephasing noise, and the full multiexcitation Hilbert space of a three-qubit quantum circuit, we predict the measurable impact of these factors on transfer efficiency. By analysis of the eigenspectrum of the network, we uncover a structure of energy levels that allows the network to exploit optical "dark" states and excited-state absorption for energy transfer. We also confirm that time-resolvable coherent oscillations could be experimentally observed, even under the strong, nonadditive action of the driving and optical fields.

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Vibration-induced coherence enhancement of the performance of a biological quantum heat engine

Cited by 36 publications

References 47 publications

Thermodynamics from indistinguishability: Mitigating and amplifying the effects of the bath

Thermodynamics from indistinguishability: Mitigating and amplifying the effects of the bath

Optimizing co-operative multi-environment dynamics in a dark-state-enhanced photosynthetic heat engine

Role of the multiple-excitation manifold in a driven quantum simulator of an antenna complex

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