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Experimental long-lived entanglement of two macroscopic objects

Author

Listed:
  • 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)

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.

Suggested Citation

  • Brian Julsgaard & Alexander Kozhekin & Eugene S. Polzik, 2001. "Experimental long-lived entanglement of two macroscopic objects," Nature, Nature, vol. 413(6854), pages 400-403, September.
    • Handle: RePEc:nat:nature:v:413:y:2001:i:6854:d:10.1038_35096524
    DOI: 10.1038/35096524
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    Cited by:

    1. Jun Jia & Valeriy Novikov & Tulio Brito Brasil & Emil Zeuthen & Jörg Helge Müller & Eugene S. Polzik, 2023. "Acoustic frequency atomic spin oscillator in the quantum regime," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Dahbi, Zakaria & Rahman, Atta Ur & Mansour, Mostafa, 2023. "Skew information correlations and local quantum Fisher information in two gravitational cat states," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 609(C).

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