Perfect single device absorber of arbitrary traveling single photon fields with a tunable coupling parameter: A QSDE approach
Hendra I. Nurdin, M. R. James, Naoki Yamamoto · 2016
We describe an ideal tuneable input-output open quantum system, realizable as either a single qubit or single resonator system, which can perfectly absorb traveling single photon states of arbitrary temporal profiles. That is, the system has a time-dependent coupling parameter to an external field that can be modulated according to the temporal profile of a single photon. We obtain an explicit analytical form for the modulation function that enables perfect absorption of single photon fields with arbitrary temporal profiles by solving the QSDE describing the system being driven by a traveling single photon field. However, a practical limit on the coupling strength prohibits a faithful physical realization of the absorber, and a numerical example is included to illustrate the absorber's performance under constrained coupling strengths.