Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge and spin manipulation in a few-electron double dot   We demonstrate high speed manipulation of a few-electron double quantum dot.
In the one-electron regime, the double dot forms a charge qubit. Microwaves are
used drive transitions between the (1,0) and (0,1) charge states of the double
dot. A local quantum point contact charge detector measures the photon-induced
change in occupancy of the charge states. Charge detection is used to measure
T1~16 ns and also provides a lower bound estimate for T2* of 400 ps for the
charge qubit. In the two-electron regime we use pulsed-gate techniques to
measure the singlet-triplet relaxation time for nearly-degenerate spin states.
These experiments demonstrate that the hyperfine interaction leads to fast spin
relaxation at low magnetic fields. Finally, we discuss how two-electron spin
states can be used to form a logical spin qubit.

23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas