Journal
PHYSICAL REVIEW LETTERS
Volume 111, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.086805
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Funding
- National Basic Research Program of China [2009CB929302]
- National Natural Science Foundation of China [91121015]
- ARO
- RIKEN iTHES Project
- MURI Center for Dynamic Magneto-Optics
- JSPS-RFBR [12-02-92100]
- MEXT Kakenhi on Quantum Cybernetics
- JSPS via its FIRST program
- Grants-in-Aid for Scientific Research [22224007, 21102002] Funding Source: KAKEN
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A semiconductor nanowire quantum dot with strong spin-orbit coupling (SOC) can be used to achieve a spin-orbit qubit. In contrast to a spin qubit, the spin-orbit qubit can respond to an external ac electric field, an effect called electric-dipole spin resonance. Here we develop a theory that can apply in the strong SOC regime. We find that there is an optimal SOC strength eta(opt) = root 2/2, where the Rabi frequency induced by the ac electric field becomes maximal. Also, we show that both the level spacing and the Rabi frequency of the spin-orbit qubit have periodic responses to the direction of the external static magnetic field. These responses can be used to determine the SOC in the nanowire.
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