title: Heralded single-magnon quantum memory for photon polarization States.
abstract: We demonstrate a heralded quantum memory where a photon announces the mapping of a light polarization state onto a single collective-spin excitation (magnon) shared between two atomic ensembles. The magnon can be converted at a later time into a single polarized photon with polarization fidelity over 90(2)% for all fiducial input states, well above the classical limit of 2/3. The process can be viewed as a nondestructive quantum probe where a photon is detected, stored, and regenerated without touching its-potentially undetermined-polarization.
authors: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors: Haruka
authors: H
authors: Tanji
authors: Saikat
authors: S
authors: Ghosh
authors: Jonathan
authors: J
authors: Simon
authors: Benjamin
authors: B
authors: Bloom
authors: Vladan
authors: V
authors: Vuletić