The unusual quantum nature of time strikes one step nearer to being untangled, because of new analysis on optical ion clocks that would permit scientists to check the movement of time in a brand new approach.
Since Albert Einstein first offered his principle of relativity, scientists have identified that the movement of time shouldn’t be absolute. Yet quantum principle takes this additional, suggesting that point could exist in a superposition, flowing each slower and sooner concurrently, not being set till it’s measured.
Now, a analysis staff from the Stevens Institute of Technology, Colorado State University, and the National Institute of Standards and Technology (NIST) has printed a paper in Physical Review Letters describing how optical ion clocks could possibly be used to judge whether or not time itself can exist in a quantum superposition.
Atomic Clocks and Quantum Time
In an atomic clock, the system is tuned to the regular vibration of an atom, which acts as a pure metronome, retaining time with extraordinary precision. Thanks to their stability and accuracy, atomic clocks underpin GPS and world communications techniques, making certain that every little thing is exactly synchronized. Now, researchers are exploring how that very same precision is perhaps utilized at the quantum stage.
These clocks depend on movement—the vibration of an atom. Yet in quantum principle, movement itself can exist in a superposition, remaining unsure till it’s measured. This makes atomic clocks a promising instrument for investigating whether or not the similar uncertainty applies to the movement of time.
“Time plays very different roles in quantum theory and in relativity,” said co-author Igor Pikovski, Assistant Professor of theoretical physics at Stevens Institute of Technology. “What we show is that bringing these two concepts together can reveal hidden quantum signatures of time-flow that can no longer be described by classical physics.”
Quantum Relativity
Relativity exhibits that point shouldn’t be absolute or unbiased, however as an alternative relies on the clock measuring it. Velocity and place are key components that decide how rapidly time passes relative to a given observer. For instance, a clock transferring at a special velocity will expertise time in another way—a phenomenon confirmed by atomic clock experiments.
This thought is commonly illustrated by the twin paradox: if one an identical twin travels at excessive velocity whereas the different stays on Earth, they’ll age at completely different charges. In quantum principle, nevertheless, this idea offers rise to the so-called quantum twin paradox, in which a single system can expertise a number of timelines concurrently in a superposition. While this concept is theoretically sound, experimental assessments have remained out of attain with present expertise.
Atomic Clocks and Relativity
In their new analysis, the staff demonstrated that combining superior atomic clock expertise with quantum computing strategies might allow quantum time analysis.
“Atomic clocks are now so sensitive, they can detect tiny differences in time caused by just the thermal vibrations at minuscule temperatures,” mentioned co-author Gabriel Sorci, a PhD candidate at Stevens Institute of Technology. “But even at the absolute zero temperature, the ground state, the ticking rate will still be affected by just the quantum fluctuations alone.”
The researchers confirmed that cooling strategies used in quantum computing can produce so-called squeezed states, the place quantum conduct turns into detectable inside the clock. In principle, this might permit a single clock to measure time as each sooner and slower concurrently.
“Physics is still full of mysteries at the most fundamental level,” Pikovski concluded, including that “Quantum technologies are now giving us new tools to shed light on them.”
The paper, “Quantum Signatures of Proper Time in Optical Ion Clocks,” appeared in Physical Review Letters on April 20, 2026.
Ryan Whalen covers science and expertise for The Debrief. He holds an MA in History and a Master of Library and Information Science with a certificates in Data Science. He will be contacted at [email protected], and comply with him on Twitter @mdntwvlf.