In the world of quantum physics, incredible events unfold with astonishing speed. Processes that were thought to occur instantaneously, such as quantum entanglement, are now directly measured in fractions of a second, or attoseconds.
It’s like freezing a moment in time to reveal the subtle details hidden in the mundane.
Professor Joachim Burgdorfer of the Institute for Theoretical Physics at the Vienna University of Technology and a team of researchers from China are measuring these fleeting moments to understand how quantum entanglement actually occurs.
These scientists are not focused on the existence of quantum entanglement, but are keen to uncover how entanglement begins: how two particles become entangled.
Understanding quantum entanglement
Using advanced computer simulations, they were able to peer into processes that occur on the attosecond timescale (billionths of a second).
Quantum entanglement is a strange and fascinating phenomenon in which two particles become interconnected and share a single state.
It’s like having two magic coins that always land on the same side. If you flip one over, the other one will mysteriously show the same result, even if they are miles apart.
“We can say that particles do not have individual properties, only common properties. From a mathematical point of view, they firmly belong together, even if they are in two completely different locations,” explains Professor Burgdorfer.
This means that no matter how far apart the particles are, measuring one particle will immediately affect the state of the other particle.
Simply put, entangled particles share connections and can instantly “talk” to each other. Measuring one particle immediately tells us something about its counterpart.
This strange behavior upends our everyday understanding of how the world works, making quantum entanglement one of the most surprising concepts in quantum physics.
Laser and electronic measurements
Although the concept of quantum entanglement seems incomprehensible, whether it is true is no longer a matter of debate, and that is not the purpose of this study.
“On the other hand, we are interested in something else: figuring out how this entanglement develops in the first place and which physical influences play a role on very short time scales,” says Professor Iva Brezinova, one of the authors of the publication.
To investigate this, the research team observed atoms that were bombarded with extremely powerful radio-frequency laser pulses. Imagine shining a super powerful flashlight on an atom.
One electron becomes so excited that it breaks free and flies away. If the laser is strong enough, the second electron in the atom is also bombarded, moving to a higher energy level and changing its orbit around the nucleus.
So after this intense burst of light, one electron is automatically turned off and the other electron is left behind, but it’s not quite the same as before.
“We can show that these two electrons are quantum entangled,” says Professor Burgdorfer. “You can only analyze them together, and you can perform measurements on one electron and learn something about the other electron at the same time.”
Time becomes vague in attoseconds
This is where things get really interesting. The electron that flies away has no clear moment when it leaves the atom.
“This means that, in principle, we do not know the birth time of the electron that flew away. It can also be said that we do not know when the electron itself left the atom,” Professor Burgdorfer points out.
It’s a so-called quantum superposition, meaning it can exist in multiple states at the same time.
But that’s not all. The time an electron leaves is related to the energy state of the electron it leaves behind.
If the remaining electrons have a higher energy, the departing electrons may leave earlier. In lower energy states, the electrons are likely slower, leaving after about 232 attoseconds on average.
Measuring the unmeasurable
Attoseconds are so short that most people cannot understand them. However, these small differences are not just theoretical.
“These differences can not only be calculated, but also measured experimentally,” says Professor Burgdorfer.
To capture this elusive timing, the research team devised a measurement protocol that combines two different laser beams.
They are already collaborating with other researchers keen to test and observe these ultrafast tangles in the lab.
The importance of quantum entanglement
How entanglement forms are understood could have major implications for quantum technologies such as cryptography and computing.
Rather than just trying to preserve entanglement, scientists can now study its very beginnings. This could lead to new ways to control quantum systems and enhance the security of quantum communications.
The journey doesn’t end here. Professor Burgdorfer and his team are excited about the next steps.
“We are already talking to research teams who want to demonstrate this type of ultrafast entanglement,” he shares.
By exploring these ultra-short time scales, they are not only observing quantum effects, but redefining the way we understand the very fabric of reality.
Quantum entanglement and the future
In the quantum world, it is clear that even the smallest moment contains a wealth of information.
“Electrons don’t just fly out of the atom; they spill out of the atom in waves, so to speak, and that takes some time,” explains Iva Brezinova.
“It is precisely at this stage that entanglement occurs, and its effects can be precisely measured later by observing the two electrons,” she concludes.
So the next time you blink, remember that in less than a trillionth of that time, an entire quantum event has unfolded, revealing secrets that could change the future of technology and our understanding of the universe.
The entire study was published in the journal physical review letter.
—–
Like what you read? Subscribe to our newsletter for fascinating articles, exclusive content and the latest updates.
Check us out on EarthSnap, the free app from Eric Ralls and Earth.com.
—–
#measurement #quantum #entanglement #speed #fast #understand