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Abstract
Storage and retrieval of parametric down-conversion (PDC) photons are demonstrated
with electromagnetically induced transparency (EIT). Extreme frequency filtering is
performed for THz order of broadband PDC light and the frequency bandwidth of the
light is reduced to MHz order. Storage and retrieval procedures are carried out for
the frequency filtered PDC photons. Since the filtered bandwidth [full width at half-maximum
(FWHM) = 9 MHz] is within the EIT window (FWHM = 12.6 MHz), the flux of the PDC light
is successfully stored and retrieved. The nonclassicality of the retrieved light is
confirmed by using photon counting method, where the classical inequality which is
only satisfied for classical light fields is introduced. Since the PDC photons can
be utilized for producing the single photon state conditionally, storage and retrieval
procedures are also performed for the conditional single photons. Anti-correlation
parameter used for checking the property of single photon state shows the value less
than 1, which means the retrieved light is in a non-classical region.