Polarizing electron spins with a superconducting flux qubit
Shingo Kukita, Hideaki Ookane, Yuichiro Matsuzaki, Yasushi Kondo
DOI 10.1103/PhysRevA.105.012613 · Physical Review A
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Abstract
Electron-spin resonance is a useful tool to investigate properties of materials in magnetic fields where high spin polarization of target electron spins is required in order to obtain high sensitivity. However, the smaller the magnetic fields becomes, the more difficult it is to obtain high polarization by thermalization. Here, we propose to employ a superconducting flux qubit (FQ) to polarize electron spins actively. We have to overcome a large energy difference between the FQ and electron spins for efficient energy transfer among them. For this purpose, we adopt a spin-lock technique on the FQ where the Rabi frequency associated with the spin-locking can match the resonance (Larmor) one of the electron spins. We find that adding dephasing on the spins is beneficial to obtain high polarization of them, because otherwise the electron spins are trapped in dark states that cannot be coupled with the FQ. We show that our scheme can achieve high polarization of electron spins in realistic experimental conditions.
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