Quantum interference device, atomic oscillator and magnetic sensor
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United States of America Patent
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Aug 19, 2014
Grant Date -
Dec 20, 2012
app pub date -
Aug 31, 2012
filing date -
Sep 7, 2009
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Abstract
A quantum interference device causing electromagnetically induced transparency in an alkali metal atom includes: a light source generating first and second resonant lights with frequency differences Δω; a magnetic field generator applying a magnetic field to the atom; a light detector detecting intensities of the first and second resonant lights passing through the atom; and a controller causing a frequency difference between specified first and second resonant lights to equal a frequency difference corresponding to an energy difference between two ground levels of the atom based on the detected light. The controller causes the frequency Δω or magnetic field intensity to satisfy 2×δ×n=Δω or Δω×n=2×δ. The frequency δ corresponds to an energy difference between two Zeeman split levels differentiated by one magnetic quantum number and generated in the two ground levels of the atom by energy splitting.
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