3,108 research outputs found
On the coupling of two quantum dots through a cavity mode
The effective coupling of two distant quantum dots through virtual photon
exchange in a semiconductor microcavity is studied. The experimental conditions
for strong coupling and its manifestation in the spectra of emission are
analyzed.Comment: 2 pages, 1 figur
Correlator expansion approach to stationary states of weakly coupled cavity arrays
We introduce a method for calculating the stationary state of a translation
invariant array of weakly coupled cavities in the presence of dissipation and
coherent as well as incoherent drives. Instead of computing the full density
matrix our method directly calculates the correlation functions which are
relevant for obtaining all local quantities of interest. It considers an
expansion of the correlation functions and their equations of motion in powers
of the photon tunneling rate between adjacent cavities, leading to an exact
second order solution for any number of cavities. Our method provides a
controllable approximation for weak tunneling rates applicable to the strongly
correlated regime that is dominated by nonlinearities in the cavities and thus
of high interest.Comment: contribution to J. Phys. B special issue celebrating Jaynes-Cummings
physic
Photon correlations from ultra-strong optical nonlinearities
We study the full field and frequency filtered output photon statistics of a
resonator in thermal equilibrium with a bath and containing an arbitrarily
large quartic nonlinearity. According to the general theory of photodetection,
we derive general input-output relations valid for the ultra-anharmonic regime,
where the nonlinearity becomes comparable to the energy of the resonator, and
show how the emission properties are modified as compared to the generally
assumed simple anharmonic regime. We analyse the impact of the nonlinearity on
the full statistics of the emission and its spectral properties. In particular
we derive a semi-analytical expression for the frequency resolved two-photon
correlations or two-photon spectrum of the system in terms of the master
equation coefficients and density matrix. This provides a very clear insight
into the level structure and emission possibilities of the system.Comment: 10 pages, 7 figure
Generation of a two-photon state from a quantum dot in a microcavity under incoherent and coherent continuous excitation
We analyze the impact of both an incoherent and a coherent continuous
excitation on our proposal to generate a two-photon state from a quantum dot in
a microcavity [New J. Phys. 13, 113014 (2011)]. A comparison between exact
numerical results and analytical formulas provides the conditions to
efficiently generate indistinguishable and simultaneous pairs of photons under
both types of excitation.Comment: 10 pages, 3 figures, conference proceeding
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