| 摘要 |
A device comprises first and second conductive leads (17 1 , 17 2 ), a first quantum dot region (19 1 ) arranged such that charge is transferable from the first lead to the second lead via the first quantum dot region, a second quantum dot region (19 2 ) configured such that charge is transferable between the first and second quantum dot regions and such that charge is not directly transferable from second quantum dot region to the first or second leads or to another lead and an electrometer (16) configured to detect charge on the second quantum region.
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