  The Josephson junction (JJ) is an essential element of superconducting (SC)
devices for both fundamental and applied physics. The short-range coherent
coupling of two adjacent JJs forms the Andreev molecule states (AMSs), which
will provide a new ingredient to engineer the SC transport in JJs and control
the Andreev qubits. However, no experimental evidence of the AMSs in the
coupled JJs has been reported. Here we provide the tunnel spectroscopic results
of electrically controllable two planar JJs sharing one SC electrode. We
discover that the coupled JJ results are highly modulated from the single JJ
results, due to formation of the phase-dependent AMSs, meaning that the two JJs
are coherently coupled. In addition, the superconducting gap closing due to the
AMS formation is observed. Our results would help in understanding the
microscopic mechanism of the coherent coupling and promoting the AMS physics to
apply for research of the topological superconductivity and quantum information
technology.
