Optically induced spin to charge transduction in donor spin read-out

Details Optically induced spin to charge transduction in donor spin read-out Optically induced spin to charge transduction in donor spin read-out

2005-07-05

arxiv.org/abs/cond-mat/0507091v2

Physics

Condensed Matter

Other Condensed Matter

8 pages, 10 figures; added reference, corrected typo

Scientific paper

10.1103/PhysRevB.72.195325

The proposed read-out configuration D+D- for the Kane Si:P architecture[Nature 393, 133 (1998)] depends on spin-dependent electron tunneling between donors, induced adiabatically by surface gates. However, previous work has shown that since the doubly occupied donor state is so shallow the dwell-time of the read-out state is less than the required time for measurement using a single electron transistor (SET). We propose and analyse single-spin read-out using optically induced spin to charge transduction, and show that the top gate biases, required for qubit selection, are significantly less than those demanded by the Kane scheme, thereby increasing the D+D- lifetime. Implications for singlet-triplet discrimination for electron spin qubits are also discussed.

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