A new line of research uses atomic clocks, enhanced by quantum states and squeezing techniques, to probe quantum aspects of time by detecting simultaneous faster and slower ticking within a single clock.

By merging high-precision atomic clock technology with quantum computing methods, researchers can explore quantum signatures of time, including revealing quantum behavior in clocks at ultra-low temperatures using squeezed states.

Experts say modern atomic clocks are sensitive enough to register minute time differences caused by quantum fluctuations, with quantum technologies offering tools to address foundational questions about time.

The work is anchored by the paper Quantum Signatures of Proper Time in Optical Ion Clocks by Sorci et al., published in Physical Review Letters on April 20, 2026.

The title and publication details of the study indicate a focus on quantum signatures of proper time in optical ion clocks.

A broader study in Physical Review Letters considers time itself potentially existing in quantum superposition, behaving as a quantum object with multiple states.

The research builds on relativity’s clock-rate variations and previous ideas of a quantum twin paradox where a single clock could traverse multiple timelines.

A collaboration among Stevens Institute of Technology, Colorado State University, and NIST proposes using optical ion clocks to test whether time can exist in a quantum superposition, potentially differing from relativistic time flow.

The concept of a quantum twin paradox envisions a system experiencing multiple timelines in superposition, challenging the classical view of a single, definite time flow.

Led by Igor Pikovski and experimental teams at CSU and NIST, the work examines how quantum effects influence time’s flow and how atomic clocks can probe these effects.

Broader implications include advancing quantum technologies to address fundamental questions about reality and time, with possible future links to detecting gravitons through quantum methods.

Researchers believe the necessary squeezing and clock precision are within reach of current ion clock technology, enabling initial laboratory tests of quantum signatures of proper time.