Superconducting circuits may make and interesting addition to the Circuit as originally put forward by Oliver Heaviside

There is a 3 volume set of books that Oliver Heaviside wrote, in which he explains circuits in this way. He proposed, that it was the circulation of the Magnetic Field in a loop that set the electrons in motion and this loop or circle is the "circuit." He then went on to show that Faraday's and Ampere's law formed a linking of circular fields called light. Einstein also claimed this was how light worked. The Tensor in this case was not Faraday's Law, nor Ampere's law by itself, but rather the totality of the two. Quantum circuits, throw a monkey wrench into this idea in that when there is spin, one of the parties can fashion a state with one spin, unknown to the other party. The Tensor is the combination of known and unknown information about the spin. It may be that there are other fields that are also part of the Tensor in Maxwell's Equations, that are not strictly Electromagnetic. The full Tensor in the Quantum Circuit would then have to include the other fields, so it may be that there is more "unknown" information, or it may be that all the information can be known.