Purification of an unpolarized spin ensemble into entangled singlet pairs

Abstract

Dynamical polarization of nuclear spin ensembles is of central importance for magnetic resonance studies, precision sensing and for applications in quantum information theory. Here we propose a scheme to generate long-lived singlet pairs in an unpolarized nuclear spin ensemble which is dipolar coupled to the electron spins of a Nitrogen Vacancy center in diamond. The quantum mechanical back-action induced by frequent spin-selective readout of the NV centers allows the nuclear spins to pair up into maximally entangled singlet pairs. Counterintuitively, the robustness of the pair formation to dephasing noise improves with increasing size of the spin ensemble. We also show how the paired nuclear spin state allows for enhanced sensing capabilities of NV centers in diamond.

9 pages, 3 figures

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• A Reinforcement Learning approach for Quantum State Engineering
• Adaptive tracking of a time-varying field with a quantum sensor
• Noise-resilient architecture of a hybrid electron-nuclear quantum register in diamond
• Steady state preparation of long-lived nuclear spin singlet pair at room temperature
• Non-classical measurement statistics induced by a coherent spin environment
• A many-body singlet prepared by a central spin qubit
• How coherence measurements of a qubit steer its quantum environment
• Magnon Condensation in a Dense Nitrogen-Vacancy Spin Ensemble
• Steady-state entanglement of spin qubits mediated by nonreciprocal and chiral magnons
• Sensitivity of Measurement-Based Purification Processes to Inner Interactions