Vibration-enhanced quantum transport

Semião, F. L.; Furuya, K.; Milburn, G. J.

doi:10.1088/1367-2630/12/8/083033

Cited by 52 publications

(57 citation statements)

References 52 publications

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“…Again, we would like to stress that there exist alternative handles to modulate the coupling strength, for example, a suitable change in the direction of the molecules' dipole moments. We start the pulse centered around site n = 1 at time t = 0 and first observe the moving Gaussian pulse according to (21) for different values of its speed v. All lengths are measured in units of d 0 , such that we effectively set d 0 = 1. In figure 10 (left), we monitor the sink population as a function of time for different values of the pulse speed.…”

Section: Guided Excitation Transfermentioning

confidence: 99%

Motional effects on the efficiency of excitation transfer

et al. 2010

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Abstract. Energy transfer plays a vital role in many natural and technological processes. In this work, we study the effects of mechanical motion on the excitation transfer through a chain of interacting molecules with applications to biological scenarios of transfer processes. Our investigation demonstrates that, for various types of mechanical oscillations, the transfer efficiency is significantly enhanced over that of comparable static configurations. This enhancement is a genuine quantum signature and requires the collaborative interplay between the quantum-coherent evolution of the excitation and the mechanical motion of the molecules; it has no analogue in the classical incoherent energy transfer. This effect may not only occur naturally but also be exploited in artificially designed systems to optimize transport processes. As an application, we discuss a simple and hence robust control technique.

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Section: Guided Excitation Transfermentioning

confidence: 99%

Motional effects on the efficiency of excitation transfer

et al. 2010

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“…The damping experienced by the oscillator arises due to its interaction with a bath. This system is a paradigmatic model to represent the transfer of electrons between two localized sites in a biomolecule [21], as well as a qubit interaction with a prominent harmonic mode of a cavity field or vibration of a nano/microcantilever [32,33].…”

Section: Udd With Structured Environmentmentioning

confidence: 99%

Performance of dynamical decoupling in bosonic environments and under pulse-timing fluctuations

et al. 2016

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We study the suppression of qubit dephasing through Uhrig dynamical decoupling (UDD) in nontrivial environments modeled within the spin-boson formalism. In particular, we address the case of (i) a qubit coupled to a bosonic bath with power-law spectral density, and (ii) a qubit coupled to a single harmonic oscillator that dissipates energy into a bosonic bath, which embodies an example of a structured bath for the qubit. We then model the influence of random time jitter in the UDD protocol by sorting pulse-application times from Gaussian distributions centered at appropriate values dictated by the optimal protocol. In case (i) we find that, when few pulses are applied and a sharp cutoff is considered, longer coherence times and robust UDD performances (against random timing errors) are achieved for a super-Ohmic bath. On the other hand, when an exponential cutoff is considered a super-Ohmic bath is undesirable. In case (ii) the best scenario is obtained for an overdamped harmonic motion. Our study provides relevant information for the implementation of optimized schemes for the protection of quantum states from decoherence.

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“…Can we identify the main collective mode capturing the system-bath correlation, a mode which could be included in the system providing an effective vibronic model weakly coupled to a residual Markovian bath? The crucial role of a vibrational mode enhancing the electronic coherence has been addressed recently [27][28][29] and examined from the non-Markovianity view point for the excitation energy transfer in pigment-protein complexes [30]. In order to understand the relation between the structure of the environment and the nonMarkovianity and to quantity these effects, several measures have been proposed recently.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the non-Markovianity for electron transfer reactions in an oligothiophene-fullerene heterojunction

2017

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a b s t r a c tThe non-Markovianity of the electron transfer in an oligothiophene-fullerene heterojunction described by a spin-boson model is analyzed using the time dependent decoherence canonical rates and the volume of accessible states in the Bloch sphere. The dynamical map of the reduced electronic system is computed by the hierarchical equations of motion methodology (HEOM) providing an exact dynamics. Transitory witness of non-Markovianity is linked to the bath dynamics analyzed from the HEOM auxiliary matrices. The signature of the collective bath mode detected from HEOM in each electronic state is compared with predictions of the effective mode extracted from the spectral density. We show that including this main reaction coordinate in a one-dimensional vibronic system coupled to a residual bath satisfactorily describes the electron transfer by a simple Markovian Redfield equation. Non-Markovianity is computed for three inter fragment distances and compared with a priori criterion based on the system and bath characteristic timescales.

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Vibration-enhanced quantum transport

Cited by 52 publications

References 52 publications

Motional effects on the efficiency of excitation transfer

Motional effects on the efficiency of excitation transfer

Performance of dynamical decoupling in bosonic environments and under pulse-timing fluctuations

Analysis of the non-Markovianity for electron transfer reactions in an oligothiophene-fullerene heterojunction

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