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Biexciton : ウィキペディア英語版
Biexciton
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 | 0 1 \rangle and | 1 0 \rangle states can be directly excited, direct excitation of the upper | 1 1 \rangle level from the ground state | 0 0 \rangle is usually forbidden and the most efficient alternative is coherent nondegenerate two-photon excitation, using | 0 1 \rangle or | 1 0 \rangle 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)
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