Perfectly capturing traveling single photons of arbitrary temporal   wavepackets with a single tunable device
  We derive the explicit analytical form of the time-dependent coupling parameter to an external field for perfect absorption of traveling single photon fields with arbitrary temporal profiles by a tunable single input-output open quantum system, which can be realized as either a single qubit or single resonator system. However, the time-dependent coupling parameter for perfect absorption has a singularity at $t=0$ and constraints on real systems prohibit a faithful physical realization of the perfect absorber. A numerical example is included to illustrate the absorber's performance under practical limitations on the coupling strength. 
Hendra I. Nurdin, Matthew R. James and Naoki Yamamoto
quant-ph cs.SY