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000903744 1001_ $$0P:(DE-Juel1)179462$$aHerrig, Tobias$$b0$$eCorresponding author
000903744 245__ $$aCooper-pair transistor as a minimal topological quantum circuit
000903744 260__ $$aCollege Park, MD$$bAPS$$c2022
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000903744 520__ $$aThe outlook of protected quantum computing spurred enormous progress in the search for topological materials, sustaining a continued race to find the most experimentally feasible platform. Here we show that one of the simplest quantum circuits, the Cooper-pair transistor, exhibits a nontrivial Chern number which has not yet been discussed, in spite of the exhaustive existing literature. Surprisingly, the resulting quantized current response is robust with respect to a large number of external perturbations, most notably low-frequency charge noise and quasiparticle poisoning. Moreover, the fact that the higher bands experience crossings with higher topological charges leads to all the bands having the same Chern number, such that there is no restriction to stay close to the ground state. Remaining small perturbations are investigated based on a generic master equation approach. Finally, we discuss a feasible protocol to measure the quantized current.
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000903744 7001_ $$0P:(DE-Juel1)168366$$aRiwar, Roman$$b1$$ufzj
000903744 773__ $$0PERI:(DE-600)3004165-X$$a10.1103/PhysRevResearch.4.013038$$gVol. 4, no. 1, p. 013038$$n1$$p013038$$tPhysical review research$$v4$$x2643-1564$$y2022
000903744 8564_ $$uhttps://juser.fz-juelich.de/record/903744/files/Invoice_INV_21_DEC_007407.pdf
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