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Optics Communications

Spontaneous emission of a three-level atom in an overdamped cavity: competition between two- and one-photon decay

Flavia Seminara, C. Leonardi

Published May 1, 1991• 0 citations
Publisher
DOI
10.1016/0030-4018(91)90364-j

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Cavity-QED-based phase gate for photonic qubits

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We present a two-qubit phase gate for photonic qubits using a three-level atom trapped in an optical cavity. In the scheme, the two ground states are coupled to the excited state by two cavity fields, respectively, and one of them is driven by a classical laser field. It is shown that, based on the large-detuning condition, the decay of atomic spontaneous emission can be effectively suppressed. The influence of cavity decay on our scheme is also investigated.

Journal of Modern Optics•Jun 20, 2009•13 citations
We study the spontaneous emission from a few two-level nano-emitters placed in a leaky microcavity with Lorentzian spectral density near a critically damped regime. Collective features of the spontaneous emission are investigated by numerical analysis of the excitation dynamics when initially one nano-emitter is totally excited but we do not know which one. The results show that there are three decay rates in the excitation dynamics, two for simple exponential decays and one for damped oscillatory decay. The excitation dynamics is found to critically depend on the regime of the system. It is shown that the spontaneous emission is enhanced or suppressed depending on whether the system is in the underdamped or overdamped regime, respectively. On the other hand, the cooperative spontaneous emission is suppressed in the underdamped while it is enhanced in the overdamped regime. Furthermore, the effect of the direct inter-emitter coupling on the breaking of the cooperativeness of the spontaneous emission is shown as well.
Enhanced and inhibited spontaneous emission of two close atoms in an overdamped cavity is studied taking into account the dipole-dipole interaction between them. The system is described in the minimal-coupling scheme and the advantages of this choice for our problem are discussed. The dynamics is investigated using both quantum Langevin equations and Master equation techniques. This last approach allows one to describe the behavior of the atoms plus field system as a one-step process. The case in which both atoms are initially in their excited state and the mode is in its vacuum state is discussed in some detail. It is shown that, different from what occurs to two close atoms in free space, in an overdamped cavity dipolar interaction may modify the decay rate. In particular, we find that the two transitions the atomic system performs to reach its equilibrium configuration can have different rates, and that for a suitable choice of the detuning between the cavity mode and the unperturbed atomic frequency, one of the transitions occurs at an enhanced rate while the second is inhibited.