Proposal of a full Bell state analyzer for spin qubits in a double quantum dot

Details Proposal of a full Bell state analyzer for spin qubits in a double quantum dot Proposal of a full Bell state analyzer for spin qubits in a double quantum dot

2010-04-16

arxiv.org/abs/1004.2758v1

Phys. Rev. B 81, 161305(R) (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1103/PhysRevB.81.161305

We propose a scheme for full Bell state measurement of spin qubits in a double quantum dot. Our scheme consists of Pauli spin-blockade measurements and biaxial electron-spin resonance. In order to eliminate the average of the Zeeman fields, the double quantum dot is designed so that the Land\'e g-factors of first and second dots satisfy g1=g2 with the use of g-factor engineering. Thus, we can swap one of the three spin-triplet states for the spin-singlet state without disturbing the other states. Our study shows that the sequential spin-to-charge conversions enable us to implement the full Bell state measurement of electron-spin qubits.

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