90,273 research outputs found
Time-dependent wave splitting and source separation
Starting from classical absorbing boundary conditions, we propose a method for the separation of time-dependent scattered wave fields due to multiple sources or obstacles. In contrast to previous techniques, our method is local in space and time, deterministic, and also avoids a priori assumptions on the frequency spectrum of the signal. Numerical examples in two space dimensions illustrate the usefulness of wave splitting for time-dependent scattering problems
Multi Mode Interferometer for Guided Matter Waves
We describe the fundamental features of an interferometer for guided matter
waves based on Y-beam splitters and show that, in a quasi two-dimensional
regime, such a device exhibits high contrast fringes even in a multi mode
regime and fed from a thermal source.Comment: Final version (accepted to PRL
Nanomechanical single-photon routing
The merger between integrated photonics and quantum optics promises new
opportunities within photonic quantum technology with the very significant
progress on excellent photon-emitter interfaces and advanced optical circuits.
A key missing functionality is rapid circuitry reconfigurability that
ultimately does not introduce loss or emitter decoherence, and operating at a
speed matching the photon generation and quantum memory storage time of the
on-chip quantum emitter. This ambitious goal requires entirely new active
quantum-photonic devices by extending the traditional approaches to
reconfigurability. Here, by merging nano-optomechanics and deterministic
photon-emitter interfaces we demonstrate on-chip single-photon routing with low
loss, small device footprint, and an intrinsic time response approaching the
spin coherence time of solid-state quantum emitters. The device is an essential
building block for constructing advanced quantum photonic architectures
on-chip, towards, e.g., coherent multi-photon sources, deterministic
photon-photon quantum gates, quantum repeater nodes, or scalable quantum
networks.Comment: 7 pages, 3 figures, supplementary informatio
A passive GHz frequency-division multiplexer/demultiplexer based on anisotropic magnon transport in magnetic nanosheets
The emerging field of magnonics employs spin waves and their quanta, magnons,
to implement wave-based computing on the micro- and nanoscale. Multi-frequency
magnon networks allow for parallel data processing within single logic elements
whereas this is not the case with conventional transistor-based electronic
logic. However, a lack of experimentally proven solutions to efficiently
combine and separate magnons of different frequencies has impeded the intensive
use of this concept. In this Letter, we demonstrate the experimental
realization of a spin-wave demultiplexer enabling frequency-dependent
separation of GHz signals. The device is based on two-dimensional magnon
transport in the form of spin-wave beams in unpatterned magnetic nanosheets.
The intrinsic frequency-dependence of the beam direction is exploited to
realize a passive functioning obviating an external control and additional
power consumption. This approach paves the way to magnonic multiplexing
circuits enabling simultaneous information transport and processing.Comment: 16 pages, 3 figure
- …