Abstract
In quantum systems, one usually seeks to minimize dephasing noise and disorder. The efficiency of transport in a quantum system is usually degraded by the presence of noise and disorder. However, it has been shown that the combination of the two can lead to significantly more efficiency than each by itself. Here, we consider how the addition of nonlocal noise, in the form of incoherent hopping, affects the transport efficiency. We show that incoherent hopping introduces additional local extrema in the efficiency function and investigate how the transport dynamics crosses over from a quantum random walk to a classical random walk.
Highlights
Environmental noise is simultaneously intrinsic to any physical process and usually detrimental to its efficient operation
In the context of excitation transport in quantum systems, dephasing noise leads to decoherence and reduces the transport efficiency
We study the effect of nonlocal noise, in the form of incoherent hopping, on the transport efficiency in a prototypal one-dimensional spin chain
Summary
Environmental noise is simultaneously intrinsic to any physical process and usually detrimental to its efficient operation. In the context of excitation transport in quantum systems, dephasing noise leads to decoherence and reduces the transport efficiency. [8], the dephasingassisted transport in quantum networks and biomolecules was investigated assuming a similar system-environment interaction They showed that, reminiscent to stochastic resonance in classical system [9], transport of excitations across dissipative quantum networks can be enhanced by local dephasing noise even at zero temperature. We show that in the absence of disorder, the addition of incoherent hopping leads to a local minimum in the efficiency, marking the crossover from coherent quantum to incoherent classical dynamics. We show that in a disordered chain, incoherent hopping leads to a local minimum and a local maximum. We explore an experimental implementation of such noise-enhanced transport dynamics with trapped ions
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