Generating spin squeezing states and Greenberger-Horne-Zeilinger entanglement using a hybrid phonon-spin ensemble in diamond

2016/05/31 by Keyu Xia, Jason Twamley · 2 citations
Physics and Astronomy · #quant-ph

paper · pdf · doi:10.1103/physrevb.94.205118

published as Phys. Rev. B 94, 205118 (2016) · 8 pages, 7 figures

arxiv created 2016/10/03 · arxiv updated 2016/11/15

Abstract

Quantum squeezing and entanglement of spins can be used to improve the sensitivity in quantum metrology. Here we propose a scheme to create collective coupling of an ensemble of spins to mechanical vibrational mode actuated by an external magnetic field. We find an evolution time where the mechanical motion decouples from the spins, and the accumulated geometric phase yields a squeezing of 5.9~dB for 20 spins. We also show the creation of a Greenberger-Horne-Zeilinger spin state for 20 spins with a fidelity of ∼ 0.62 at cryogenic temperature. The numerical simulations show that the geometric-phase based scheme is mostly immune to thermal mechanical noise.

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