Heralded single-magnon quantum memory for photon polarization States.
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.
Tanji
Haruka
H
Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Ghosh
Saikat
S
Simon
Jonathan
J
Bloom
Benjamin
B
Vuletić
Vladan
V