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This Defense Intelligence Reference Document from the Defense Intelligence Agency, dated 10 December 2010, is one of a series of advanced technology reports produced in FY 2010 under the Advanced Aerospace Weapon System Applications (AAWSA) Program. It reviews quantum computing technologies and DNA-based molecular computing for onboard supercomputing on future spacecraft. It forecasts ion-trap quantum computers within 10 years, simple DNA tile computing within 20 years, and self-repairing DNA computers on a 40-year horizon.
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• E C V UNCLASSIFIED//509 OFFHilllL ~81!! CICE1 • '-" • -/1 II R II ► r <1 -"' Figure 3. Left; Energy diagram for quantum dot in single-layer graphene. Right; Bound state levels as function of dot radius. Graphene Disc in Single-Layer Graphene Single layer graphene is attracting attention because its charge carriers are massless, relativistic particles (56). The relativistic effects result from a unique, zero-gap band structure that leads to quantum states described by the two-component Dirac-Weyl equation. This allows relativistic physics to be explored in a solid state system and has many potential applications ranging from high frequency electronics (57) to quantum computing (58). Graphene dots can be formed from external potentials or nanocrystals but this work is only concerned with external potentials. The physics of nanocrystals has been discussed recently (59) (60) and is different from the situation treated here. The quantum states, in external potentials are quasi-bound: they have a low amplitude oscillatory tail and are similar to the scattering resonances studied in undergraduate physics. A perpendicular magnetic field enhances the localization of these states (61) and true bound states can occur in graphene dots defined by a spatially non-uniform field (62). So a magnetic vector potential has a localizing effect that tends to cancel the delocalizing effect of a scalar potential. 16 (a) d//dV0.inS) 0 0 4 0 8 (b) l[pA] 82C4060 Vs.:: = BOO uV'-"'=c~~ 19001 1888 • 'f" 1860 oC ,~. 1828 1380 1408 1420 1440 1460 1480 Figure 4. (a) Color scale plot of the transconductance. (b) One of the vertices of the honeycomb structure at Vsd = 800 1,1V: Charge stability diagrams for series-coupled quantum dots. UNCLASSIFIED// I OR orrIeIJ!lt ~81!! 8HLY
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Report, from the dia collection. The PDF is mirrored here; the original link is under it. 54 pages are in the text index: search them above, or from the library's search.