SEARCH · Search NASA
Results for “Waveguide”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Heralded Bell State of Dissipative Qubits Using Classical Light in a Waveguide
Maximally entangled two-qubit states (Bell states) are of central importance in quantum technologies. We show that heralded generation of a maximally entangled state of two intrinsically open qubits can be realized in a one-dimensional (1d) system through strong coherent driving and continuous monitoring. In contrast to the natural idea that dissipation leads to decoherence and so destroys quantum effects, continuous measurement and strong interference in our 1d system generate a pure state with perfect quantum correlation between the two open qubits. Though the steady state is a trivial product state which has zero coherence or concurrence, we show that, with carefully tuned parameters, a Bell state can be generated in the system's quantum jump trajectories, heralded by a reflected photon. Surprisingly, this maximally entangled state survives the strong coherent state input—a classical state that overwhelms the system. This simple method to generate maximally entangled states using classical coherent light and photon detection may, since our qubits are in a 1d continuum, find application as a building block of quantum networks.
High Quality Entangled Photon Pair Generation in Periodically Poled Thin-Film Lithium Niobate Waveguides
Not Available
Nondegenerate two-photon absorption in GaAs/AlGaAs multiple quantum well waveguides
Not Available
Frustration-induced anomalous transport and strong photon decay in waveguide QED
Not Available
Ballistic bunching of photoinjected electron bunches with dielectric-lined waveguides
Not Available
Quantum Electrodynamics in a Topological Waveguide
Not Available
Volumetric Imaging and Characterization of Focusing Waveguide Grating Couplers
Not Available
An Acoustic Waveguide With Tight Field Confinement for High Temperature Sensing
Not provided.
Frequency Noise of Silicon Nitride Optomechanical Oscillators with Integrated Waveguides.
Abstract not provided.
Fabrication of a terahertz quantum-cascade laser with a double metal waveguide based on multilayer GaAs/AlGaAs heterostructures
The Postgrowth processing of GaAs/AlGaAs multilayer heterostructures for terahertz quantumcascade lasers (QCLs) are studied. This procedure includes the thermocompression bonding of In–Au multilayer heterostructures with a doped n{sup +}-GaAs substrate, mechanical grinding, and selective wet etching of the substrate, and dry etching of QCL ridge mesastripes through a Ti/Au metallization mask 50 and 100 μm wide. Reactive-ion-etching modes with an inductively coupled plasma source in a BCl{sub 3}/Ar gas mixture are selected to obtain vertical walls of the QCL ridge mesastripes with minimum Ti/Au mask sputtering.
A Novel Waveguide Concept for Ultrasonic Thermometry Applications
Explore the source record for details and available documents.