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Quantum coherence is one of the most important topics in fundamental physics. In mesoscopic systems, decoherence has often been studied using Aharonov-Bohm (AB) interferometers, and in such a coherent transport, it is well known that probes of a sample play an essential role and transport property has been successfully described by the Landauer-B¨uttiker (LB) formalism.1) Here we present evidence that the quantum coherence itself is also a?ected by the probe con?guration.

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