Photon echoes using atomic frequency combs in Pr:YSO -- experiment and
semiclassical theory
- URL: http://arxiv.org/abs/2011.04086v3
- Date: Wed, 16 Nov 2022 21:38:06 GMT
- Title: Photon echoes using atomic frequency combs in Pr:YSO -- experiment and
semiclassical theory
- Authors: Aditya N. Sharma, Zachary H. Levine, Martin A. Ritter, Kumel H.
Kagalwala, Eli J. Weissler, Elizabeth A. Goldschmidt, Alan L. Migdall
- Abstract summary: Photon echoes in rare-earth-doped crystals are studied to understand the challenges of making broadband quantum memories.
The hyperfine structure of Pr3+ poses an obstacle to this goal because frequencies associated with the hyperfine transitions change the simple picture of modulation.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Photon echoes in rare-earth-doped crystals are studied to understand the
challenges of making broadband quantum memories using the atomic frequency comb
(AFC) protocol in systems with hyperfine structure. The hyperfine structure of
Pr^{3+} poses an obstacle to this goal because frequencies associated with the
hyperfine transitions change the simple picture of modulation at an externally
imposed frequency. The current work focuses on the intermediate case where the
hyperfine spacing is comparable to the comb spacing, a challenging regime that
has recently been considered. Operating in this regime may facilitate storing
quantum information over a larger spectral range in such systems.
In this work, we prepare broadband AFCs using optical combs with tooth
spacings ranging from 1 MHz to 16 MHz in fine steps, and measure transmission
spectra and photon echoes for each. We predict the spectra and echoes
theoretically using the optical combs as input to either a rate equation code
or a density matrix code, which calculates the redistribution of populations.
We then use the redistributed populations as input to a semiclassical theory
using the frequency-dependent dielectric function. The two sets of predictions
each give a good, but different account of the photon echoes.
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