Role of hyperfine interaction for cavity-mediated coupling between spin qubits

Details Role of hyperfine interaction for cavity-mediated coupling between spin qubits Role of hyperfine interaction for cavity-mediated coupling between spin qubits

2011-03-17

arxiv.org/abs/1103.3435v3

Phys. Rev. B 84, 205127 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

7 pages, 7 figures

Scientific paper

10.1103/PhysRevB.84.205127

We consider two qubits interacting by means of an optical cavity, where each qubit is represented by a single electron spin confined to a quantum dot. It is known that electron spins in III-V semiconductor quantum dots are affected by the decoherence due to the hyperfine interaction with nuclear spins. Here we show that the interaction between two qubits is influenced by the Overhauser field as well. Starting from an unpolarizied nuclear ensemble, we investigate the dependance of the fidelities for two-qubit gates on the Overhauser field. We include the hyperfine interaction perturbatively to second order in our analytical results, and to arbitrary precision numerically.

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