Quantum Mach effect by Sagnac Phase Shift on Cooper pairs in rf-SQUID
  The inertial drag on Cooper pairs in a rotating rf-SQUID ring leads to an asymmetry in the Hamiltonian potential able to force the average magnetic field versus in the ring along the angular velocity one. This effect is a Sagnac signature of Cooper pairs at a quantum level and it may probe the fundamental quantum Mach principle within detectability levels. 
D. Fargion, L. Chiatti, A. Aiello (Phys. Dept. Rome, Italy and   INFN-Rome, Medical Phys.Lab.CRS-IRE. Rome)