Experimental long-lived entanglement of two macroscopic objects

Brian Julsgaard, Alexander Kozhekin and Eugene S. Polzik ()
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Brian Julsgaard: Institute of Physics and Astronomy, University of Aarhus
Alexander Kozhekin: Institute of Physics and Astronomy, University of Aarhus
Eugene S. Polzik: Institute of Physics and Astronomy, University of Aarhus

Nature, 2001, vol. 413, issue 6854, 400-403

Abstract: Abstract Entanglement is considered to be one of the most profound features of quantum mechanics1,2. An entangled state of a system consisting of two subsystems cannot be described as a product of the quantum states of the two subsystems3,4,5,6. In this sense, the entangled system is considered inseparable and non-local. It is generally believed that entanglement is usually manifest in systems consisting of a small number of microscopic particles. Here we demonstrate experimentally the entanglement of two macroscopic objects, each consisting of a caesium gas sample containing about 1012 atoms. Entanglement is generated via interaction of the samples with a pulse of light, which performs a non-local Bell measurement on the collective spins of the samples7. The entangled spin-state can be maintained for 0.5 milliseconds. Besides being of fundamental interest, we expect the robust and long-lived entanglement of material objects demonstrated here to be useful in quantum information processing, including teleportation8,9,10 of quantum states of matter and quantum memory.

Date: 2001
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DOI: 10.1038/35096524

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