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In condensed matter physics, biexcitons are created from two free excitons. == Formation of biexcitons == In quantum information and computation, it is essential to construct coherent combinations of quantum states. The basic quantum operations can be performed on a sequence of pairs of physically distinguishable quantum bits and, therefore, can be illustrated by a simple four-level system. In an optically driven system where the and states can be directly excited, direct excitation of the upper level from the ground state is usually forbidden and the most efficient alternative is coherent nondegenerate two-photon excitation, using or as an intermediate state. 〔G. Chen et al, "Biexciton Quantum Coherence in a Single Quantum Dot", ''Phys. Rev. Lett.'', 88 (11), 117901 (2002)〕 〔Xiaoqin Li et al, "An All-Optical Quantum Gate in a Semiconductor Quantum Dot", ''Science'', 301, 809 (2003)〕 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Biexciton」の詳細全文を読む スポンサード リンク
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