Phys.org November 19, 2024 An international team of researchers (Canada, USA – Stanford University) presented an imaging and neural rendering technique that seeks to synthesize videos of light propagating through a scene from novel, moving camera viewpoints. They used a new ultrafast imaging setup to capture a first-of-its kind, multi-viewpoint video dataset with picosecond-level temporal resolution. Combined with this dataset, they introduced an efficient neural volume rendering framework based on the transient field defined as a mapping from a 3D point and 2D direction to a high-dimensional, discrete-time signal that represented time-varying radiance at ultrafast timescales. They rendered a range […]
Tag Archives: Photons
A device to sort photon states could be useful for quantum optical computer circuits
Phys.org September 2, 2024 A quantum emitter interacting with photons in a single optical mode constitutes a one-dimensional atom. A coherent and efficiently coupled one-dimensional atom provides a large nonlinearity, enabling photonic quantum gates. Achieving a high coupling efficiency ( factor) and low dephasing is challenging. An international team of researchers (Switzerland, Germany) used a semiconductor quantum dot in an open microcavity as an implementation of a one-dimensional atom. With a weak laser input, they achieved an extinction of 99.2% in transmission and a concomitant bunching in the photon statistics, showcasing the reflection of the single-photon component and the transmission […]
Researchers trap atoms, force them to serve as photonic transistors
Phys.org July 29, 2024 It remains a challenging task to efficiently trap a large ensemble of cold atoms on an integrated nanophotonic circuit. Researchers at Purdue University demonstrated direct loading of an ensemble of up to 70 atoms into an optical microtrap on a nanophotonic microring circuit by employing degenerate Raman-sideband cooling in the microtrap, where a built-in spin-motion coupling arose directly from the vector light shift of the evanescent-field potential on a microring. Atoms were cooled into the trap via optical pumping with a single free space beam. They achieved a trap lifetime approaching 700 ms under continuous cooling. […]