Scientists just found a new way to build atomic clocks, making time even more precise

Get this: scientists are looking at a brand new kind of atomic clock. It uses something called ytterbium-173 ions, and it could totally change how we measure time in the future.

For ages, the world has relied on cesium atomic clocks to keep everything perfectly in sync. But these new "optical atomic clocks" are on track to take over. They're so precise, they could actually redefine what a "second" even means. It's like upgrading from a sundial to a smartwatch, but for the entire planet.

The Best of Both Worlds

Researchers at a place called PTB have been building these super-accurate optical clocks for a while. Now, they've got a clever new design. It's an optical clock that uses multiple ytterbium-173 ions. This setup is pretty nuts because it combines two amazing things: the super high accuracy you get from clocks with just one ion, and the rock-solid stability you get from measuring a bunch of ions at once. It's a joint effort with Thailand's metrology institute, NIMT.

The team, led by Tanja Mehlstäubler, just published their findings. Beyond making timekeeping way better, this could open doors for quantum computing and even give us new ways to peek inside atoms.

Think of it this way: some optical clocks are like laser-focused snipers (super accurate, single ion). Others are like steady, wide-net fishermen (very stable, many particles). Mehlstäubler's group is trying to get both superpowers in one device. They've done it before with indium ions, and now they're trying it with a different flavor of ytterbium, the 173 kind.

"This isotope has a particularly interesting transition," Mehlstäubler explained.

When we talk about a "transition" in an atomic clock, it's like a tiny quantum jump an atom makes between two energy levels. It happens when you hit it with light at just the right frequency. Old-school cesium clocks use microwaves for this. These new optical clocks use laser light. And here's the kicker: laser light vibrates about 100,000 times faster than microwaves. That means we can slice time into way, way smaller pieces, making measurements incredibly precise.

A Long-Lasting "Whoa" Moment

With ytterbium-173, this important transition leads to an "excited state" that sticks around for a really long time.

"This allows us to make more stable measurements," said Jialiang Yu, one of the lead authors. "But usually, you need super strong laser light for that, which can cause big problems."

But here's the cool part: the core of the ytterbium-173 atom has a special structure. This gives it unique properties that helped the researchers get around those tricky limits. They could even control multiple ions at the same time. Seriously clever.

So, they've built an optical clock that gets the best of both worlds: the sharp precision of a single-ion clock and the steady stability of a multi-ion system. Plus, this atom seems like a great candidate for quantum computing because you can control its quantum states with crazy high precision using laser light.

This ytterbium-173 system could be a big deal for quantum computing. Since it can control and store several quantum states at once, it might help us store and process a lot more quantum information faster. They even measured how long this special "clock state" lasts for the first time. That measurement gives us cool new info about the atom's core and could help us test some really sensitive ideas in physics, maybe even finding things our current understanding can't explain.