### Session T29: Focus Session: Semiconductor Qubits - Coherent Control, Decoherence, and Relaxation

2:30 PM–5:30 PM, Wednesday, February 29, 2012
Room: 259A

Chair: Charles Tahan, Laboratory for Physical Sciences

Abstract ID: BAPS.2012.MAR.T29.7

### Abstract: T29.00007 : A fast hybrid'' silicon double quantum dot qubit

4:06 PM–4:18 PM

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#### Authors:

Teck Seng Koh

Zhan Shi

C.B. Simmons

J.R. Prance

John King Gamble

Yun-Pil Shim

Xuedong Hu
(University at Buffalo, SUNY)

D.E. Savage

M.G. Lagally
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 = 1/2) and $S_z$ = -1/2, 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.