  Quantum imaging can potentially provide certain advantages over classical
imaging. Thus far, however, the signal-to-noise ratios (SNRs) are poor; the
resolvable pixel counts are low; biological organisms have not been imaged;
birefringence has not been quantified. Here, we introduce quantum imaging by
coincidence from entanglement (ICE). Utilizing spatially and polarization
entangled photon pairs, ICE exhibits higher SNRs, greater resolvable pixel
counts, imaging of biological organisms, and ghost birefringence
quantification; it also enables 25 times greater suppression of stray light
than classical imaging. ICE can potentially empower quantum imaging towards new
applications in life sciences and remote sensing.
