430 research outputs found
A quantum photonics model for non-classical light generation using integrated nanoplasmonic cavity-emitter systems
The implementation of non-classical light sources is becoming increasingly
important for various quantum applications. A particularly interesting approach
is to integrate such functionalities on a single chip as this could pave the
way towards fully scalable quantum photonic devices. Several approaches using
dielectric systems have been investigated in the past. However, it is still not
understood how on-chip nanoplasmonic antennas, interacting with a single
quantum emitter, affect the quantum statistics of photons reflected or
transmitted in the guided mode of a waveguide. Here we investigate a quantum
photonic platform consisting of an evanescently coupled nanoplasmonic
cavity-emitter system and discuss the requirements for non-classical light
generation. We develop an analytical model that incorporates quenching due to
the nanoplasmonic cavity to predict the quantum statistics of the transmitted
and reflected guided waveguide light under weak coherent pumping. The
analytical predictions match numerical simulations based on a master equation
approach. It is moreover shown that for resonant excitation the degree of
anti-bunching in transmission is maximized for an optimal cavity modal volume
and cavity-emitter distance . In reflection, perfectly anti-bunched
light can only be obtained for specific combinations. Finally, our
model also applies to dielectric cavities and as such can guide future efforts
in the design and development of on-chip non-classical light sources using
dielectric and nanoplasmonic cavity-emitter systems
Spontaneous emission control in high-extraction efficiency plasmonic crystals
We experimentally and theoretically investigate exciton-field coupling for
the surface plasmon polariton (SPP) in waveguide-confined (WC) anti-symmetric
modes of hexagonal plasmonic crystals in InP-TiO-Au-TiO-Si heterostructures.
The radiative decay time of the InP-based transverse magnetic (TM)-strained
multi-quantum well (MQW) coupled to the SPP modes is observed to be 2.9-3.7
times shorter than that of a bare MQW wafer. Theoretically we find that 80 % of
the enhanced PL is emitted into SPP modes, and 17 % of the enhanced
luminescence is redirected into WC-anti-symmetric modes. In addition to the
direct coupling of the excitons to the plasmonic modes, this demonstration is
also useful for the development of high-temperature SPP lasers, the development
of highly integrated photo-electrical devices, or miniaturized biosensors.Comment: Spontaneous emission control in high-extraction efficiency plasmonic
crystal
Coupling of PbS Quantum Dots to Photonic Crystal Cavities at Room Temperature
We demonstrate the coupling of PbS quantum dot emission to photonic crystal
cavities at room temperature. The cavities are defined in 33% Al, AlGaAs
membranes on top of oxidized AlAs. Quantum dots were dissolved in
Poly-methyl-methacrylate (PMMA) and spun on top of the cavities. Quantum dot
emission is shown to map out the structure resonances, and may prove to be
viable sources for room temperature cavity coupled single photon generation for
quantum information processing applications. These results also indicate that
such commercially available quantum dots can be used for passive structure
characterization. The deposition technique is versatile and allows layers with
different dot densities and emission wavelengths to be re-deposited on the same
chip.Comment: 9 pages, 3 figure
Temporally and spectrally multiplexed single photon source using quantum feedback control for scalable photonic quantum technologies
Current proposals for scalable photonic quantum technologies require
on-demand sources of indistinguishable single photons with very high efficiency
(having unheralded loss below ). Even with recent progress in the field
there is still a significant gap between the requirements and state of the art
performance. Here, we propose an on-chip source of multiplexed, heralded
photons. Using quantum feedback control on a photon storage cavity with an
optimized driving protocol, we estimate an on-demand efficiency of and
unheralded loss of order , assuming high efficiency detectors and
intrinsic cavity quality factors of order . We further explain how
temporal- and frequency-multiplexing can be used in parallel to significantly
reduce device requirements if single photon frequency conversion is possible
with efficiency in the same range of
Photon-Photon Interactions in Dynamically Coupled Cavities
We study theoretically the interaction between two photons in a nonlinear
cavity. The photons are loaded into the cavity via a method we propose here, in
which the input/output coupling of the cavity is effectively controlled via a
tunable coupling to a second cavity mode that is itself strongly
output-coupled. Incoming photon wave packets can be loaded into the cavity with
high fidelity when the timescale of the control is smaller than the duration of
the wave packets. Dynamically coupled cavities can be used to avoid limitations
in the photon-photon interaction time set by the delay-bandwidth product of
passive cavities. Additionally, they enable the elimination of wave packet
distortions caused by dispersive cavity transmission and reflection. We
consider three kinds of nonlinearities, those arising from
and materials and
that due to an interaction with a two-level emitter. To analyze the input and
output of few-photon wave packets we use a Schr\"odinger-picture formalism in
which travelling-wave fields are discretized into infinitesimal time-bins. We
suggest that dynamically coupled cavities provide a very useful tool for
improving the performance of quantum devices relying on cavity-enhanced
light-matter interactions such as single-photon sources and atom-like quantum
memories with photon interfaces. As an example, we present simulation results
showing that high fidelity two-qubit entangling gates may be constructed using
any of the considered nonlinear interactions
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