Many-body singlets by dynamic spin polarization

Details Many-body singlets by dynamic spin polarization Many-body singlets by dynamic spin polarization

2011-01-20

arxiv.org/abs/1101.3888v1

Phys. Rev. B 83, 201308(R), (2011)

Physics

Quantum Physics

Scientific paper

10.1103/PhysRevB.83.201308

We show that dynamic spin polarization by collective raising and lowering operators can drive a spin ensemble from arbitrary initial state to many-body singlets, the zero-collective-spin states with large scale entanglement. For an ensemble of $N$ arbitrary spins, both the variance of the collective spin and the number of unentangled spins can be reduced to O(1) (versus the typical value of O(N)), and many-body singlets can be occupied with a population of $\sim 20 %$ independent of the ensemble size. We implement this approach in a mesoscopic ensemble of nuclear spins through dynamic nuclear spin polarization by an electron. The result is of two-fold significance for spin quantum technology: (1) a resource of entanglement for nuclear spin based quantum information processing; (2) a cleaner surrounding and less quantum noise for the electron spin as the environmental spin moments are effectively annihilated.

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