3000 atoms from a single proton.
Yesterday the researcher of MIT (Massachusetts Institute of Technology)
published a report which provide information about a new technique of entangle
30000 and more atoms using a photon.
The technique provides a realistic method to generate large ensembles of
entangled atoms, which are key components for realizing more-precise atomic
clocks.
The Lester Wolfe Professor in MIT's Department of Physics,
and the paper's senior author said that "You can make the argument that a
single photon cannot possibly change the state of 3,000 atoms, but this one
photon does -- it builds up correlations that you didn't have before," He also added that "We have basically
opened up a new class of entangled states we can make, but there are many more
new classes to be explored."
MIT quantum physicist Vladan Vuletić and colleagues bounced
photons between two mirrors in a space that contained about 3,100 rubidium
atoms cooled to nearly absolute zero. Occasionally the polarization of a photon
changed slightly, indicating that the photon had interacted with the atoms.
Measurements revealed that each brief interaction coaxed at least 2,700 of the
atoms to become entangled.
