Fig. 3

Measured normalized correlation variances of input and released optical submodes. Trace (1) is the vacuum noise level. Trace (2) is the correlation variances of the original input optical submodes. a V1 \(( {\langle {{\delta ^2}( {\hat X{{(0)}_{{\rm{L2}}}} - \hat X{{(0)}_{{\rm{L3}}}}})} \rangle })\), b V2 \(( {\langle {{\delta ^2}( {g_{{\rm{L1}}}^{{\rm{opt}}}\hat P{{(0)}_{{\rm{L1}}}} + \hat P{{(0)}_{{\rm{L2}}}} + \hat P{{(0)}_{{\rm{L3}}}}})}\rangle })\), c V3 \(( {\langle {{\delta ^2}( {\hat X{{(0)}_{{\rm{L1}}}} - \hat X{{(0)}_{{\rm{L3}}}}})}\rangle })\), d V4 \(( {\langle {{\delta ^2}( {\hat P{{(0)}_{{\rm{L1}}}} + g_{{\rm{L2}}}^{{\rm{opt}}}\hat P{{(0)}_{{\rm{L2}}}} + \hat P{{(0)}_{{\rm{L3}}}}})}\rangle })\), e V5 \(( {\langle {{\delta ^2}( {\hat X{{(0)}_{{\rm{L1}}}} - \hat X{{(0)}_{{\rm{L2}}}}})}\rangle })\), f V6 \(( {\langle {{\delta ^2}( {\hat P{{(0)}_{{\rm{L1}}}} + \hat P{{(0)}_{{\rm{L2}}}} + g_{{\rm{L3}}}^{{\rm{opt}}}\hat P{{(0)}_{{\rm{L3}}}}})}\rangle })\). Trace (3) is corresponding correlation variances of released optical submodes after a storage time of 1000 ns. Error bars represent ±1 standard error and are obtained with the statistics of the measured correlation variances