A new study in Physical Review Letters has used atomic clocks to study relativistic effects in interacting quantum systems.
The reconciliation of general relativity and quantum mechanics is one of the biggest challenges in science, one that continues to elude us.Now, a new study by Anjun Chu and colleagues has examined how mass-energy equivalence manifests via gravitational effects in optical lattice clocks and interacts with quantum phenomena like entanglement.
“We’ve known how gravity affects time and how quantum mechanics governs atomic behavior separately, but seeing them interact in a controllable way is revolutionary,” said Chu in a press release.Highly precise timekeepersTo study this intersection, the researchers used optical lattice clocks, the most accurate timekeepers ever created. They trapped thousands of strontium atoms vertically in grids of laser light. Atomic clocks rely on the steady frequency at which electrons in atoms transition between energy levels. Keeping a count of these oscillations allows atomic clocks to measure time with extremely high precision.The effects of Einstein’s mass-energy equivalence come into play when performing high-precision measurements through two effects.First is the gravitational redshift which causes atoms at different heights to tick at different rates, as gravity is slightly weaker for atoms higher up. Second, as atoms move, the second-order Doppler shift generates tiny changes in frequency.To study the interactions between quantum mechanics and gravity, the researchers came up with a way to make the atoms communicate with each other. The atoms were placed in an optical cavity, a chamber with highly reflective mirrors that trap light. This allows atoms to exchange photons which are particles of light with each other, creating quantum interactions between atoms that would normally operate independently.Quantum synchronization and dressingThe researchers discovered that these photonic interactions between the atoms cause them to synchronize their timekeeping despite the gravitational effects.“It’s similar to how pendulum clocks hanging on the same wall eventually swing in unison. But in our case, it’s atoms exchanging quantum information while experiencing different rates of time due to gravity,” said co-author Jun Ye in the press release.Further, this synchronization induces quantum entanglement between the atoms. Termed by Einstein as “spooky action at a distance,” quantum entanglement causes two particles to become correlated, despite the distance between them.The researchers showed that the time it takes for atoms to synchronize reveals information about how entangled the system is, potentially offering new ways to harness quantum properties for enhanced precision measurements.To distinguish true gravitational effects from other influences like magnetic fields, the scientists developed a technique called dressing. By applying specific lasers, they could tune how strongly atoms experience gravitational time dilation, providing a clear signature that the effect truly comes from Einstein’s relativity rather than experimental artifacts.Applications beyond fundamental physicsUnderstanding these effects has implications beyond fundamental physics. For example, it could lead to even more precise timekeeping technologies, with applications ranging from GPS navigation to detecting underground resources and even dark matter searches.The researchers are now working to implement their theoretical protocols in real optical lattice clocks, where they expect to observe these quantum-relativistic effects within the next few years.The study is published in Physical Review Letters.
General Relativity Physics Quantum Entanglement Quantum Mechanics
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