Quantum computation with quantum dots and terahertz cavity QED

The Sherwin group is participating in a large effort both within and outside of UCSB, to investigate the implementation of quantum information processing in semiconductors. Our vision is summarized in the following figure.

1. Quantum information is stored in the quantum states of electrons which are bound either inside "quantum dots" or to impurities.
2. These "quantum bits" are located inside a microcavity for THz radiation (The Imamoglu/Hu groups are building and investigating cavities for near-ir (~1 µm wavelength) radiation).
3. The quantum bits are controlled and read out by near-ir lasers, which can be focused down onto individual quantum bits.

Our current 5-year goal is to implement a so-called "universal quantum logic gate" using this general approach. Some details of our approach can be found in these references: Sherwin et. al. (1999), Imamoglu et. al. (1999).

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