106 research outputs found
Dipole induced transparency in drop-filter cavity-waveguide systems
We show that a waveguide that is normally opaque due to interaction with a
drop-filter cavity can be made transparent when the drop filter is also coupled
to a dipole. A transparency condition is derived between the cavity lifetime
and vacuum Rabi frequency of the dipole. This condition is much weaker than
strong coupling, and amounts to simply achieving large Purcell factors. Thus,
we can observe transparency in the weak coupling regime. We describe how this
effect can be useful for designing quantum repeaters for long distance quantum
communication
Dispersive properties and giant Kerr non-linearities in Dipole Induced Transparency
We calculate the dispersive properties of the reflected field from a cavity
coupled to a single dipole. We show that when a field is resonant with the
dipole it experiences a 90 degree phase shift relative to reflection from a
bare cavity if the Purcell factor exceeds the bare cavity reflectivity. We then
show that optically Stark shifting the dipole with a second field can be used
to achieve giant Kerr non-linearites. It is shown that currently achievable
cavity lifetimes and cavity quality factors can allow a single emitter in the
cavity to impose a nonlinear phase shift at the single photon level
Theoretical and Experimental Investigation of Efficient Photonic Crystal Cavity-Waveguide Couplers
Coupling of photonic crystal (PC) linear three-hole defect cavities to PC waveguides is theoretically and experimentally investigated. An improved coupling is obtained by tilting the cavity axis by 60° with respect to the waveguide direction
Generating entanglement between quantum dots with different resonant frequencies based on Dipole Induced Transparency
We describe a method for generating entanglement between two spatially
separated dipoles coupled to optical micro-cavities.
The protocol works even when the dipoles have different resonant frequencies
and radiative lifetimes.
This method is particularly important for solid-state emitters, such as
quantum dots, which suffer from large inhomogeneous broadening. We show that
high fidelities can be obtained over a large dipole detuning range without
significant loss of efficiency. We analyze the impact of higher order photon
number states and cavity resonance mismatch on the performance of the protocol
- …