Patent ID: 7952796
Filing Date: 2011-05-31
Classification: B82Y,G06N,G11B,G11C

Abstract:
1. A quantum data storage, comprising: a nonlinear optical medium configured to include: a first ground state and a second ground state which are closely spaced to each other in energy level or degenerated and to forbid two-photon transitions between the first and second ground states; an excited state which has a spin inhomogeneous broadening and to allow two-photon transitions between the first ground state and the second ground state via the excited state and allow a spin coherence; an auxiliary state for forbidding two-photon transitions between the first and second ground states via the auxiliary state and allowing a transition from/to the excited state; wherein a spin coherence induced by a transition of two photons from the first ground state and the second state to the excited state is transited to the auxiliary state so that a phase decay of the spin coherence is prevented and data is stored as the phase of the spin coherence; and a laser emitter configured to emit a laser beam for allowing at least one of a transition between the first ground state and the excited state, a transition between the second ground state and the excited state, and a transition between the excited state and the auxiliary state.