When two quantum systems that were meant to be exactly the same have a small change in shape and composition. A smaller but still critical frequency mismatch arises. These changes result in slightly different frequencies of photons generated by the system than the exact replication that quantum communication networks may require.
This new green laser pointer photonic frequency converter, as an example of nanophotonic engineering, addresses both of these issues, the magazine reported. The key components of this chip-integrated device are a tiny ring-shaped resonator with a diameter of about 80 microns (slightly smaller than the width of a human hair) and a thickness of a few tenths of a micron. The shape and size of this ring made of silicon nitride have been optimized to enhance the material's inherent properties of converting light from one frequency to another. This ring resonator is driven by two pump lasers, each of which operates at an independent frequency. In a system called four-wave mixing Bragg scattering. There is a change in the frequency of a photon entering the ring resonator. The amount of change is equal to the frequency difference between the two pump lasers.
Just like riding a track, the incident light has traveled hundreds of times before it comes out of the resonator, which greatly improves the device's ability to convert photon frequencies at low power and low background noise. Unlike previous experiments that required several watts of power, the system only consumed about a few percent of the power. What's more, the amount of added noise is low enough to be used in future experiments using a single photon source.
Although other technologies have been applied to frequency conversion, "Nano-photonic technology also has its benefits. It has the potential to make the device smaller, easier to customize, lower power consumption, and compatible with mass manufacturing technology. Our work is the first A demonstration of nanophotonic laser pointer technology suitable for this difficult quantum frequency conversion task. This work was done by researchers at the Center for Nanoscience and Technology.
Depending on the situation, some laser pointers will perform better than others. When the constellations need to be highlighted, a stronger beam should be used to point to the position in the sky. Only high-power laser pointers can produce this type of beam. When you want to distract your pet, you need much less power. Other factors, such as the color of the laser and the availability of accessories, will also influence your decision.