Figure 1
From: Enhancing photon generation rate with broadband room-temperature quantum memory
The schematic diagram of enhancing photon generation rate with broadband room-temperature quantum memory. (a) The write process. In the three-level \(\Lambda\)-type configuration, the ground state \(\left| g\right\rangle\) and \(\left| s\right\rangle\) respectively represent \(F=3\) and \(F=4\) hyperfine state of \(6S_{1/2}\) state, while the manifold of \(6P_{3/2}\) state is labeled as \(\left| e\right\rangle\) state. The gray zone represents the broad virtual state addressed by the strong write pulse, and the emitted Stokes photon is painted in green. (b) The read process. The generated anti-Stokes photon is painted in blue. (c) The main idea of feedback protocol is to extend the single write pulses into a sequence of write pulse, and it keeps inducing Stokes photons until one is successfully detected, leading to a higher efficiency of creating the spin wave.
