Quantum Information Processing with Ferroelectrically Coupled Quantum Dots

Details Quantum Information Processing with Ferroelectrically Coupled Quantum Dots Quantum Information Processing with Ferroelectrically Coupled Quantum Dots

2001-01-05

arxiv.org/abs/quant-ph/0101026v1

Physics

Quantum Physics

10 pages, 3 figures

Scientific paper

10.1103/PhysRevA.64.052306

I describe a proposal to construct a quantum information processor using ferroelectrically coupled Ge/Si quantum dots. The spin of single electrons form the fundamental qubits. Small (<10 nm diameter) Ge quantum dots are optically excited to create spin polarized electrons in Si. The static polarization of an epitaxial ferroelectric thin film confines electrons laterally in the semiconductor; spin interactions between nearest neighbor electrons are mediated by the nonlinear process of optical rectification. Single qubit operations are achieved through "g-factor engineering" in the Ge/Si structures; spin-spin interactions occur through Heisenberg exchange, controlled by ferroelectric gates. A method for reading out the final state, while required for quantum computing, is not described; electronic approaches involving single electron transistors may prove fruitful in satisfying this requirement.

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