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New schemes for the nuclear spin quantum memory are proposed based on asystem composed of two electrons or one electron coupled to a single nuclearspin in isotopically purified group IV elemental and II-VI compoundsemiconductors. The qubit consists of the singlet state and one of the tripletstates of two electrons or simply of an electron spin. These systems are freefrom the decoherence due to the nuclear dipole-dipole interaction and areadvantageous for the long memory time. In the case of two electrons, theprotocol for the quantum state transfer between the electron spin qubit and thenuclear spin qubit is based on the magnetic or electric field tuning of thesinglet-triplet state crossing and on the hyperfine coupling supplemented witha well-defined scheme to initialize the nuclear spin. In the case of a singleelectron qubit, the quantum state transfer is driven by the hyperfineinteraction itself without the need of the nuclear spin initialization. Manypractical systems are considered, e.g., two electrons loaded on a Si or ZnSequantum dot, a single electron charged state in a Si quantum dot doped with a Patom, a single electron charged $ ^{28}$Si quantum dot doped with an isotopeatom of $ ^{29}$Si, and a localized electron system of Si:P and ZnSe:F in thebulk crystal. General aspects of these systems are investigated and acomparison of merits and demerits is made between the two-electron qubit andthe single-electron qubit.

Proposals of nuclear spin quantum memory in group IV elemental and II-VI semiconductors