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Updated: Oct 26, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Doubly Modulated Optical Lattice Clock: Interference and Topology.

Xiao-Tong Lu^1,2, Tao Wang^3,4, Ting Li^1,2

¹Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi'an 710600, China.

Physical Review Letters

|July 30, 2021

Summary

Researchers explored quantum nonequilibrium systems using an optical lattice clock. They observed interference between Floquet channels, demonstrating a link to topological insulators and enabling quantum topological phase simulations.

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Area of Science:

Quantum physics
Atomic physics
Condensed matter physics

Background:

Quantum systems under periodic modulation are often described by effective static Floquet Hamiltonians.
In stroboscopic measurements, initial phases are typically irrelevant.
Modulating uncorrelated parameters introduces a relative phase that impacts system physics.

Purpose of the Study:

To investigate the impact of relative phase in modulated quantum systems.
To explore quantum nonequilibrium dynamics in an optical lattice clock (OLC).
To experimentally demonstrate the connection between Floquet engineering and topological phases.

Main Methods:

Simultaneous modulation of lattice laser frequency and Rabi frequency in an OLC.
Utilizing the OLC's high precision and stability to tune the relative phase.
Experimental detection of eigenenergies to analyze the effective Floquet Hamiltonian.

Main Results:

Observed interference between two Floquet channels, serving as evidence of the phase effect.
Demonstrated the relationship between the effective Floquet Hamiltonian and a one-dimensional topological insulator.
Achieved a high winding number in the experimental setup.

Conclusions:

The relative phase in modulated quantum systems is experimentally controllable and significant.
The OLC platform is suitable for simulating quantum topological phases.
This work provides a method for detecting phase effects and simulating topological phenomena.