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Related Experiment Video

Updated: Jul 26, 2025

Quasi-light Storage for Optical Data Packets

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Quantum-limited optical time transfer for future geosynchronous links.

Emily D Caldwell^1,2, Jean-Daniel Deschenes³, Jennifer Ellis¹

¹National Institute of Standards and Technology (NIST), Boulder, CO, USA.

|June 21, 2023

Summary

This summary is machine-generated.

Researchers achieved near quantum-limited optical time transfer, synchronizing distant locations to 320 attoseconds. This breakthrough enables robust free-space networks for precise time dissemination and advanced scientific applications.

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Area of Science:

Physics
Metrology
Astronomy

Background:

Optical clocks and optical time transfer are key for advanced networks.
Current optical time transfer lacks quantum-limited performance.
Connecting ground and space optical clocks enables new applications.

Purpose of the Study:

To demonstrate optical time transfer at near quantum-limited performance.
To enable robust free-space optical time transfer networks.
To reduce received power requirements for time synchronization.

Main Methods:

Demonstrated time transfer with near quantum-limited acquisition and timing.
Utilized low received power (10,000x lower than previous).
Achieved synchronization over 300 km between mountaintops.

Main Results:

Synchronized distant sites to 320 attoseconds.
Operated at 10,000 times lower received power.
Achieved near quantum-limited performance in optical time transfer.

Conclusions:

This method is critical for long-distance free-space links with limited photons.
Supports 102 dB link loss at 4.0 mW transmit power.
Enables future time transfer to geosynchronous orbits.