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Comparison between entangled and nonentangled two-reservoir Kondo systems

We clarify the difference between entangled and nonentangled two-reservoir mesoscopic Kondo systems and reveal the reason why theories using the Keldysh formalism, quantum Monte Carlo calculations, and the renormalization group approaches cannot explain the line shapes of tunneling conductance of mesoscopic Kondo systems measured by using a two-terminal setup but explain those of a three-terminal setup. We emphasize that the previous theories study a nonentangled system, while real two-reservoir mesoscopic Kondo systems are entangled systems in which two reservoirs are within the coherent region. We show that two coherent side peaks appearing in tunneling conductance signify the entanglement between two reservoirs. These side peaks are essential for explaining the experimental observations for tunneling conductance.