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Correlated electrons ‘tango’ in a perovskite oxide at the extreme quantum limit

  • By Jennifer Zheng
  • 5 October 2021

A team led by the Department of Energy’s Oak Ridge National Laboratory has found a rare quantum material in which electrons move in coordinated ways, essentially “dancing.” Straining the material creates an electronic band structure that sets the stage for exotic, more tightly correlated behavior – akin to tangoing – among Dirac electrons, which are especially mobile electric charge carriers that may someday enable faster transistors. The results are published in the journal Science Advances. . .

 

Preparing Students to be Leaders of the Quantum Information Revolution

  • By Jennifer Zheng
  • 28 September 2021

As the crowning technological inventions of the first quantum revolution—transistors, lasers, and computers—continue to enrich our lives, newfound excitement surrounds the use of quantum phenomena to create a second quantum revolution. Quantum computers will compute faster than existing classical ones and enable computations that were not previously possible. Quantum sensors will detect one-part-in-a-million variations in Earth’s gravitational field or tiny magnetic fields emanating from the human brain. Quantum communication technologies will send information securely over long distances, protected by fundamental laws of nature. . .

Reinventing the Laser

  • By Jennifer Zheng
  • 28 September 2021

Congratulations to David Pekker and his team for publishing their paper, “Proposal for a continuous wave laser with linewidth well below the standard quantum limit,” in Nature Communications!

The standard quantum limit on coherence of laser light was first obtained by Schawlow and Townes in 1958. Except for a small modification in 1999, which decreased this limit by a factor of two, the Schawlow-Townes limit has stood as the ultimate theoretical bound on laser . . .