A fast "hybrid" silicon double quantum dot qubit

Details A fast "hybrid" silicon double quantum dot qubit A fast "hybrid" silicon double quantum dot qubit

2011-10-30

arxiv.org/abs/1110.6622v1

Physics

Quantum Physics

Includes text and supplemental material, 12 pages, 9 figures

Scientific paper

We propose a quantum dot qubit architecture that has an attractive combination of speed and fabrication simplicity. It consists of a double quantum dot with one electron in one dot and two electrons in the other. The qubit itself is a set of two states with total spin quantum numbers $S^2=3/4$ ($S=\half$) and $S_z = -\half$, with the two different states being singlet and triplet in the doubly occupied dot. The architecture is relatively simple to fabricate, a universal set of fast operations can be implemented electrically, and the system has potentially long decoherence times. These are all extremely attractive properties for use in quantum information processing devices.

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