Quantum entanglement realized between distant large objects

Phys.org  September 28, 2020
The disparity of hybrid systems and the vulnerability of quantum correlations have thus far hampered the generation of macroscopic hybrid entanglement. An international team of researchers (Spain, USA – University of Chicago, Denmark) generated an entangled state between the motion of a macroscopic mechanical oscillator and a collective atomic spin oscillator, as witnessed by an Einstein–Podolsky–Rosen variance below the separability limit, 0.83 ± 0.02 < 1. The mechanical oscillator is a millimetre-size dielectric membrane, and the spin oscillator is an ensemble of 109 atoms in a magnetic field. Light propagating through the two spatially separated systems generated entanglement because the collective spin plays the role of an effective negative-mass reference frame and provides a back-action-free subspace; in the experiment, quantum back-action is suppressed by 4.6 dB…read more. Open Access TECHNICAL ARTICLE 

 

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