Here E J = | E ( 0 ) | = Φ Φ 0 I c 2 π π is a characteristic parameter of the Josephson junction, named the Josephson Energy. It is related to the Josephson Inductance by E J = L J I c 2 . An alternative but equivalent definition E ( φ φ ) = E J ( 1 − − cos ⁡ ⁡ φ φ ) is also often used.