Quantum computing and single-qubit measurements using the spin filter effect

Abstract

Many things will have to go right for quantum computation to become a reality in the lab. For any of the presently-proposed approaches involving spin states in solids, an essential requirement is that these spins should be measured at the single-Bohr-magneton level. Fortunately, quantum computing provides a suggestion for a new approach to this seemingly almost impossible task: convert the magnetization into a charge, and measure the charge. I show how this might be done by exploiting the spin filter effect provided by ferromagnetic tunnel barriers, used in conjunction with one-electron quantum dots.

11 pages, LaTeX, 1 figure. To be published in J. Appl. Phys., paper given at the 43rd Annual MMM Conference

References in corpus (2)

• Quantum Measurements Performed with a Single-Electron Transistor
• Quantum Information is Physical

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