Superradiance of non-interacting atoms
- URL: http://arxiv.org/abs/2206.14646v1
- Date: Wed, 29 Jun 2022 13:39:55 GMT
- Title: Superradiance of non-interacting atoms
- Authors: M. Bojer, J. von Zanthier
- Abstract summary: Two-level atoms separated by less than the transition wavelength cooperatively emit light in a short burst.
The burst is characterized by a maximum intensity scaling with the square of the number of atoms $N$.
We show that in this case a similar superradiant burst of the emitted radiation is observed if the quantum correlations of the atoms are generated by conditional photon measurements.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Fully-excited two-level atoms separated by less than the transition
wavelength cooperatively emit light in a short burst, a phenomenon called
superradiance by R. Dicke in 1954. The burst is characterized by a maximum
intensity scaling with the square of the number of atoms $N$ and a temporal
width reduced by $N$ compared to the single atom spontaneous decay time. Both
effects are usually attributed to a synchronization of the electric dipole
moments of the atoms occurring during the process of light emission. Contrary
to this explanation, it was recently shown by use of a quantum path description
that the peak intensity results from the quantum correlations among the atoms
when occupying symmetric Dicke states. Here we investigate from this
perspective the temporal evolution of the ensemble, starting in the small
sample limit, i.e., when the atoms have mutual separations much smaller than
the transition wavelength $\lambda$ and pass down the ladder of symmetric Dicke
states. In addition, we explore the temporal evolution for the case of
non-interacting atoms with mutual separations much larger than $\lambda$. We
show that in this case a similar superradiant burst of the emitted radiation is
observed if the quantum correlations of the atoms are generated by conditional
photon measurements retaining the atomic ensemble within or close to the
symmetric subspace.
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