Low Frequency Spin Oscillations in Metallic Phase of High Temperature Superconductors in Quantum Computers

The spin oscillation spectrum in metallic (paramagnetic) phase of high temperature superconductors of the type La_2-xSr_xCuO₄ and YBa₂Cu₃O_7-y is examined in the external magnetic field. In case of a weak magnetic field it is shown that in the low frequency spectrum region there is a real spin oscillation mode. As its spectrum pattern is concerned, the mode is similar to helicon excitations in magnetic active plasma. Methods of experimental observation of the mode are discussed.