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JILA researchers have, for the first time, isolated groups of a few atoms and measured their multi-particle interactions within an atomic clock. The advance will help scientists control interacting quantum matter, which is expected to boost the performance of atomic clocks, many other types of sensors, and quantum information systems.
The research is described in a paper titled early Oct. 31. JILA is jointly operated by the National Institute of Standards and Technology (NIST) and the University of Colorado Boulder
NIST scientists have been predicting "many body" physics and its benefits for years, but the new JILA work provides the first quantitative (19659002) "We Are Trying to Understand the Emergence of Uncertainty in Electromagnetic Compatibility" (19659002) each other, "NIST and JILA Fellow Jun Ye said. "Even though we may understand the rules, we can understand the uncertainties."
on control of individual quantum particles. This is the case even when sets of thousands of atoms are used in an atomic clock. These measurements are approaching the so-called standard quantum limit – a "wall".
Harnessing of many-particle interactions atom collisions and protect quantum states against interference, or noise. In addition, atoms in such systems could be more important than quantum noise, which would be more important in the new research, the JILA team. used their three-dimensional strontium lattice clock]which offers precise atom control. They create arrays of one and two atoms, and then use a laser to set the clock "ticking," or switching to a specific frequency between two energy levels in the atoms. JILA's new imaging technique was used to measure the atoms' quantum states.
The results were nonlinear, or unpredicted based on the past experience, a hallmark of multi-particle interactions. The authors combined their findings with NIST and Ana Maria Rey and Paul Julienne to conclude that multi-particle interactions occurred.
Specifically, the clock's frequency shifted in unexpected ways. The shift is different from what one would expect from summing up various peers of atoms. For example, five atoms per cell caused a shift of 20 percent compared to what would normally be expected.
"Once you get your atoms, change the rules," Ye said. (19659002) Multi-particle effects also appeared in crowded, this is because of the atoms' nuclear spins and electronic configurations play together to determine the overall quantum state, and the atoms can all interact with each other. lattice cells in the form of an unusual, rapid decay process. Two atoms per molecule and one atom remained loose, but all had enough energy to escape the trap. By contrast, Ye said, "What this means is, we can make sure there is only one atomic atom in our atomic clock," Ye said . "
The JILA team is one of the leaders in this process, which is one of the most important tools for the production of clones. Long-lived atoms of a long-lived, highly condensed states, meaning the atoms' quantum properties were linked in a stable way. This is a simple method of multiple atom atoms can be a useful resource for quantum information processing.
Research Report: Emergence of multi-body interactions in few-atom sites of a fermionic lattice clock
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National Institute of Standards and Technology (NIST)
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More goals in quantum soccer
Bonn, Germany (SPX) Oct 25, 2018
Let's suppose you were allowed to blindfold German soccer star Timo Werner and turn him on his own axis several times. Then you'd ask him to take a shot blind. It would be unlikely that this hit the goal.
With a trick, Bonn physicists still managed to achieve a 90-percent score rate in a similar situation. However, their player was almost 10 billion times smaller than the German star striker – and much less predictable.
It was a rubidium atom that the researchers had … read more
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