Single-shot high-resolution identification of discrete frequency modes of single-photon-level optical pulses

Frequency-multiplexed quantum communication usually requires a single-shot identification of the frequency mode single photon . In this paper, we propose scheme that can identify with high-resolution even for spontaneously emitted photons whose generation time is unknown, by combining time-to-space and frequency-to-time mapping. We also demonstrate mapping (100 MHz intervals) to temporal (435 ns weak coherent pulses using atomic combs. This interval close minimum comb memory Pr3+ ion-doped Y2SiO5 crystal, proposed has potential maximize multiplexing repeater memory.