Many-body singlets by dynamic spin polarization

Abstract

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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Cited by in corpus (8)

• Macroscopic singlet states for gradient magnetometry
• Engineering steady states using jump-based feedback for multipartite entanglement generation
• The theory of coherent dynamic nuclear polarization in quantum dots
• Efficient generation of many-body singlet states of spin-1 bosons in optical superlattices
• Generating coherent state of entangled spins
• Protecting dissipative quantum state preparation via dynamical decoupling
• Deterministic preparation of Dicke states of donor nuclear spins in silicon by cooperative pumping
• Casimir Invariants for Systems Undergoing Collective Motion