Physics – Quantum Physics
Scientific paper
2004-09-18
Physics
Quantum Physics
7 pages, 5 figures
Scientific paper
We propose a solid state based protocol to implement the universal quantum storage for electronic spin qubit. The quantum memory in this scheme is the spin wave excitation in the ring array of nuclei in a quantum dot. We show that the quantum information carried by an arbitrary state of the electronic spin can be coherently mapped onto the spin wave excitations or the magnon states. With an appropriate external control, the stored quantum state in quantum memory can be read out reversibly. We also explore in detail the quantum decoherence mechanism due to the inhomogeneous couplings between the electronic spin and the nuclear spins.
Li Yadong
Song Zhankai
Sun Chang-Pu
Wang Ying-Dan
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