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Phys Rev Lett. 2009 Jul 24;103(4):043601. Epub 2009 Jul 20.

Heralded single-magnon quantum memory for photon polarization States.

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  • 1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.


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.

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