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Résumé:

We investigate the transport of energy in a linear chain of two-level quantum emitters ("atoms")weakly coupled to a blackbody radiation bath [1]. We show that, simply by displacing one ormore atoms from their regular-chain positions, the efficiency of the energy transport can beconsiderably amplified of at least one order of magnitude. Besides, in configurations providingan efficiency greater than 100% , the distance between the two last atoms of the chain canbe up to 20 times larger than the one in the regular chain, thus achieving a much longer-rangeenergy transport. By performing both a stationary and time-dependent analysis, we ascribethis effect to an elementary block of three atoms, playing the role of excitation injector fromthe blackbody bath to the extraction site. By considering chains with up to 7 atoms, we alsoshow that the amplification is robust and can be further enhanced up to 1400%.-------------------------[1] P. Doyeux, R. Messina, B. Leggio, and M. Antezza, Phys. Rev. A 95, 012138 (2017).