Control nano-mecánico sobre la emisión de fotones en una microcavidad
Castrillon Mendoza, Larry Steven
In this work we study radiation-matter interaction in the limit of a single excitation when nano-mechanical effects act on the single photon emitted by a qubit. In particular, we use two different models. In the first model, we consider an opto-mechanical cavity with an oscillating mirror in front of a qubit, initially in its excited state. A photon is emitted and reflected by the mirror so it can re-excite the qubit and so continue a process of controlled emission. The qubit interacts with a continuous bath of harmonic oscillators with which energy can be partially exchanged. Results show that the time-dependent dynamics of light emission can be Markovian or non-Markovian. In both cases, the frequency spectrum exhibits sideband photons associated with nano-mechanical oscillations. In the second model, in addition to the opto-mechanical cavity, the qubit is located on an optical nano-cavity. In this picture we have two couplings, while the first one acts between the qubit and the single mode of the optical nano-cavity, the second one acts between the external modes of the opto-mechanical and the single mode of optical nano-cavity. The results of the time-dependent dynamics in the qubit-nanocavity, show that this system is capable of exchanging its only coherent excitation due to feedback produced by the mirror, even if the first coupling is weak. The energy exchange with the external modes produces a type-like Rabi oscillation, in which the system behaves as if it were in the strong coupling regime. The low amplitude of these oscillations shows that energy is partially exchanged between the external modes and the optical nano-cavity. Finally, we show that if we change the state of motion of the mirror, the entire structure of external modes does also change, causing a damping in the Rabi oscillations over time.
•Apr 6, 2015•0 citations