



01416nas a2200145   4500008004100000245014100041210006900182260001400251490000700265520088800272100002801160700002501188700002001213856003701233       2011                        eng d00aLight storage in an optically thick atomic ensemble under conditions of  electromagnetically induced transparency and four-wave mixing
0 aLight storage in an optically thick atomic ensemble under condit  c2011/6/200 v833 a  We study the modification of a traditional electromagnetically induced
transparency (EIT) stored light technique that includes both EIT and four-wave
mixing (FWM) in an ensemble of hot Rb atoms. The standard treatment of light
storage involves the coherent and reversible mapping of one photonic mode onto
a collective spin coherence. It has been shown that unwanted, competing
processes such as four-wave mixing are enhanced by EIT and can significantly
modify the signal optical pulse propagation. We present theoretical and
experimental evidence to indicate that while a Stokes field is indeed detected
upon retrieval of the signal field, any information originally encoded in a
seeded Stokes field is not independently preserved during the storage process.
We present a simple model that describes the propagation dynamics of the fields
and the impact of FWM on the spin wave.
1 aPhillips, Nathaniel, B.1 aGorshkov, Alexey, V.1 aNovikova, Irina  uhttp://arxiv.org/abs/1103.2131v101341nas a2200145   4500008004100000245004200041210004200083260001300125490000700138520094000145100002801085700002501113700002001138856003701158       2008                        eng d00aOptimal light storage in atomic vapor0 aOptimal light storage in atomic vapor  c2008/8/10 v783 a  We study procedures for the optimization of efficiency of light storage and
retrieval based on the dynamic form of electromagnetically induced transparency
(EIT) in warm Rb vapor. We present a detailed analysis of two recently
demonstrated optimization protocols: a time-reversal-based iteration procedure,
which finds the optimal input signal pulse shape for any given control field,
and a procedure based on the calculation of an optimal control field for any
given signal pulse shape. We verify that the two procedures are consistent with
each other, and that they both independently achieve the maximum memory
efficiency for any given optical depth. We observe good agreement with
theoretical predictions for moderate optical depths (<25), while at higher
optical depths the experimental efficiency falls below the theoretically
predicted values. We identify possible effects responsible for this reduction
in memory efficiency.
1 aPhillips, Nathaniel, B.1 aGorshkov, Alexey, V.1 aNovikova, Irina  uhttp://arxiv.org/abs/0805.3348v100956nas a2200145   4500008004100000245005600041210005600097260001400153490000700167520052600174100002000700700002800720700002500748856003700773       2008                        eng d00aOptimal light storage with full pulse shape control0 aOptimal light storage with full pulse shape control  c2008/8/200 v783 a  We experimentally demonstrate optimal storage and retrieval of light pulses
of arbitrary shape in atomic ensembles. By shaping auxiliary control pulses, we
attain efficiencies approaching the fundamental limit and achieve precise
retrieval into any predetermined temporal profile. Our techniques, demonstrated
in warm Rb vapor, are applicable to a wide range of systems and protocols. As
an example, we present their potential application to the creation of optical
time-bin qubits and to controlled partial retrieval.
1 aNovikova, Irina1 aPhillips, Nathaniel, B.1 aGorshkov, Alexey, V.  uhttp://arxiv.org/abs/0805.1927v100984nas a2200181   4500008004100000245005700041210005700098260001400155490000700169520043900176100002000615700002500635700002400660700002500684700002300709700002600732856004400758       2007                        eng d00aOptimal control of light pulse storage and retrieval0 aOptimal control of light pulse storage and retrieval  c2007/6/150 v983 a  We demonstrate experimentally a procedure to obtain the maximum efficiency
for the storage and retrieval of light pulses in atomic media. The procedure
uses time reversal to obtain optimal input signal pulse-shapes. Experimental
results in warm Rb vapor are in good agreement with theoretical predictions and
demonstrate a substantial improvement of efficiency. This optimization
procedure is applicable to a wide range of systems.
1 aNovikova, Irina1 aGorshkov, Alexey, V.1 aPhillips, David, F.1 aSorensen, Anders, S.1 aLukin, Mikhail, D.1 aWalsworth, Ronald, L.  uhttp://arxiv.org/abs/quant-ph/0702266v1