Proposal for quantum many-body simulation and torsional matter-wave interferometry with a levitated nanodiamond Article Swipe
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· 2017
· Open Access
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· DOI: https://doi.org/10.1103/physreva.96.023827
· OA: W2743472839
Hybrid spin-mechanical systems have great potentials in sensing, macroscopic\nquantum mechanics, and quantum information science. In order to induce strong\ncoupling between an electron spin and the center-of-mass motion of a mechanical\noscillator, a large magnetic gradient is usually required, which is difficult\nto achieve. Here we show that strong coupling between the electron spin of a\nnitrogen-vacancy (NV) center and the torsional vibration of an optically\nlevitated nanodiamond can be achieved in a uniform magnetic field. Thanks to\nthe uniform magnetic field, multiple spins can strongly couple to the torsional\nvibration at the same time. We propose to utilize this new coupling mechanism\nto realize the Lipkin-Meshkov-Glick (LMG) model by an ensemble of NV centers in\na levitated nanodiamond. The quantum phase transition in the LMG model and\nfinite number effects can be observed with this system. We also propose to\ngenerate torsional superposition states and realize torsional matter-wave\ninterferometry with spin-torsional coupling.\n
