Photonics

We have written a review article describing advances in chip-integrated laser technologies in the visible and short near-infrared wavelength regimes.

In a new paper, we demonstrate interactions between vapor-phase Rb atoms and an integrated photonic microresonator down to the few-atom, few-photon level.

In two new papers, we describe how to increase the continuous tuning range of chip-integrated optical parametric oscillators (OPOs) and we demonstrate dense coverage of the so-called 'green gap' spectral region using such OPOs.

JQI Fellow Alexey Gorshkov has won the 2024 Institute of Electrical and Electronics Engineers (IEEE) Photonics Society Quantum Electronics Award.

The researchers are part of a team that won the quantum category at the university’s Invention of the Year Awards for developing a new method to count particles of light—known as photons—without destroying them.

A team of JQI researchers and their colleagues have won in the quantum category of the UMD Invention of the Year Award. They are honored for developing a new method for counting particles of light—photons—without destroying them.

Researchers at the Joint Quantum Institute (JQI) have created the first silicon chip that can reliably constrain light to its four corners. The effect, which arises from interfering optical pathways, isn't altered by small defects during fabrication and could eventually enable the creation of robust sources of quantum light. That robustness is due to topological physics, which describes the properties of materials that are insensitive to small changes in geometry. The cornering of light, which was reported June 17 in Nature Photonics, is a realization of a new topological effect, first predicted in 2017.

The smallest amount of light you can have is one photon, so dim that it’s pretty much invisible to humans. While imperceptible, these tiny blips of energy are useful for carrying quantum information around. Ideally, every quantum courier would be the same, but there isn’t a straightforward way to produce a stream of identical photons. This is particularly challenging when individual photons come from fabricated chips. Now, researchers at the Joint Quantum Institute (JQI) have demonstrated a new approach that enables different devices to repeatedly emit nearly identical single photons. The team, led by JQI Fellow Mohammad Hafezi, made a silicon chip that guides light around the device’s edge, where it is inherently protected against disruptions. Previously, Hafezi and colleagues showed that this design can reduce the likelihood of optical signal degradation. In a paper published online on Sept. 10 in Nature, the team explains that the same physics which protects the light along the chip’s edge also ensures reliable photon production.