Parallel Quantum Circuit in a Tunnel Junction

Omid Faizy Namarvar (1) , Ghassen Dridi (1) , Christian Joachim (1, 2)

1 CEMES-GNS - Groupe NanoSciences
2 MANA - MANA National Insitute for Material Sciences

Spectral analysis of 1 and 2-states per line quantum bus are normally sufficient to determine the effective Vab(N) electronic coupling between the emitter and receiver states through the bus as a function of the number N of parallel lines. When Vab(N) is difficult to determine, an Heisenberg-Rabi time dependent quantum exchange process must be triggered through the bus to capture the secular oscillation frequency Ωab(N) between those states. Two different linear and regimes are demonstrated for Ωab(N) as a function of N. When the initial preparation is replaced by coupling of the quantum bus to semi-infinite electrodes, the resulting quantum transduction process is not faithfully following the Ωab(N) variations. Because of the electronic transparency normalisation to unity and of the low pass filter character of this transduction, large Ωab(N) cannot be captured by the tunnel junction. The broadly used concept of electrical contact between a metallic nanopad and a molecular device must be better described as a quantum transduction process. At small coupling and when N is small enough not to compensate for this small coupling, an N2 power law is preserved for Ωab(N) and for Vab(N).

Domaines: Physique [physics]

Omid Faizy Namarvar, Ghassen Dridi, Christian Joachim. Parallel Quantum Circuit in a Tunnel Junction. Scientific Reports, 2016, 6 (1), ⟨10.1038/srep30198⟩. ⟨hal-01712760⟩