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Title: Crystallization of photons in Rydberg media
Plain: Theory predicts that photons slowed in a Rydberg atom cloud can repel so strongly that they line up like a crystal. This has not been seen for more than a few photons.
Precise: Rydberg electromagnetically induced transparency medium with blockade radius $R_{b}$ and optical depth per blockade radius $\mathrm{OD}_{b}$. Predicted crystalline order of polaritons (Otterbach et al., PRL 2013). Measure n-photon correlations g^(n)(tau_1,...) showing periodic order across at least 3 photons. Answer: observed or ruled out at accessible $\mathrm{OD}_{b}$.
Settled by: Multi-photon correlation measurements showing periodic density order for three or more photons.
Kind: well-posed
Answer type: yes-no
References: (empty)
Literature status: open
Status note: (empty)
Posed since: 2013