Optical: systems and elements – Optical frequency converter
Reexamination Certificate
2011-05-31
2011-05-31
Sanghavi, Hemang (Department: 2874)
Optical: systems and elements
Optical frequency converter
C365S106000, C365S215000
Reexamination Certificate
active
07952796
ABSTRACT:
The present invention provides a quantum optical data storage protocol, whose storage time is lengthened by spin population decay time from several minutes to several hours. The quantum data storage includes a first ground state and a second ground state which are closely spaced 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 sate 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.
REFERENCES:
patent: 6680860 (2004-01-01), Merkel et al.
patent: 06-051457 (1994-02-01), None
patent: 2722631 (1997-11-01), None
Ham, et al., “Spin Coherence Excitation and Rephasing with Optically Shelved Atoms,” The American Physical Society, vol. 58, No. 18, Nov. 1, 1998.
Nilsson, et al., “Solid State Quantum Memory Using complete Absorption and Re-emission of Photons by Tailored and Externally Controlled Inhomogeneous Absorption Profiles,” Optics Communications 247 (2005), Sep. 10, 2004.
English Translation of Abstract of JP06051457, published on Feb. 25, 1994.
English Translation of Abstract of JP2252123, published on Sep. 10, 1990 (also published as JP2722631).
Notice of Allowance Jun. 28, 2010, Korean Patent Application No. KR 10-2008-0076678.
Inha-Industry Partnership Institute
Sanghavi Hemang
Vierra Magen Marcus & DeNiro LLP
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