Physics – Quantum Physics
Scientific paper
2004-11-15
Quantum Information and Computation, Vol. 6, No 4&5 (2006) 289-325
Physics
Quantum Physics
37 pages, 19 figures. New version clarified, conclusions updated, and new sections on micromotion, example trap, manufacturing
Scientific paper
We study the problem of designing electrode structures that allow pairs of ions to be brought together and separated rapidly in an array of linear Paul traps. We show that it is desirable for the electrode structure to produce a d.c. octupole moment with an a.c. radial quadrupole. For the case where electrical breakdown limits the voltages that can be applied, we show that the octupole is more demanding than the quadrupole when the characteristic distance scale of the structure is larger than 1 to 10 microns (for typical materials). We present a variety of approaches and optimizations of structures consisting of one to three layers of electrodes. The three-layer structures allow the fastest operation at given distance r from the trap centres to the nearest electrode surface, but when the total thickness w of the structure is constrained, leading to w < r, then two-layer structures may be preferable.
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Steane Andrew M.
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