| 摘要 |
<p>A quantum computer (57) comprises a trench-isolated channel region (2) formed in a boron-doped silicon germanium layer which has narrow channel regions (7, 8, 9) which form tunnel barriers and wide channel regions (10, 11) which define first and second quantum dots (10, 11). Tunnelling between the first and second quantum dots is controlled by a side gate (58) and/or a surface gate (69). The quantum states used to represent a qubit may be defined as an excess hole on the first quantum dot&rang& and an excess hole on the second quantum dot&rang&. A Hadamard Transformation UH of an initial state maybe effected by application of a pulse to the side or surface gate. The first and second tunnel quantum dots are of unequal size which helps decouple the quantum computer from the environment. <IMAGE></p> |
