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Quantum

A Dynamic Multiplexing Policy for a Quantum Repeater

Jeroen Grimbergen, Sounak Kar, Michal van Hooft, Conor Bradley, Stephanie Wehner

Featured July 17, 2026

Original Paper

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Simply

By smartly switching all available quantum chips to connect to the *other* side once one link is made, the new method helps quantum internet devices create entangled connections much faster and more reliably, even with imperfect hardware.

In depth
The paper introduces a dynamic multiplexing policy for quantum repeaters that significantly enhances entanglement fidelity and secret key rates in near-term quantum networks. Unlike fixed approaches, this policy intelligently reassigns all available quantum chips to generate entanglement with the *opposite* end node once a link to one side is established, thereby minimizing the time entangled links spend waiting in memory and reducing decoherence.

Key Takeaways

  • 1
    The proposed dynamic multiplexing policy significantly improves the fidelity of end-to-end entangled links compared to fixed policies, especially for near-term hardware with limited memory coherence times.
  • 2
    This dynamic approach leads to substantially higher secret key rates, particularly when the number of quantum chips on the repeater node is limited, even when accounting for increased optical router losses.
  • 3
    The performance gains stem from reducing the waiting time for entangled links to be matched and avoiding the queuing of multiple links to the same end node, thus mitigating decoherence.

Conceptual Flow

HIGH LEVEL
1
Methodology: Dynamic vs. Fixed Resource Assignment

Imagine a post office with many workers. The old way assigns half to send letters left and half to send letters right, always. The new way, if a letter goes left, assigns *everyone* to send letters right until one goes, then switches.

Many Workers
Left Mailbox
Right Mailbox
Assign Workers
Fixed Assignment
Dynamic Assignment
2
Results: Better Quality, More Secure Keys

The new smart way of assigning workers means letters spend less time waiting, so they arrive in better condition, allowing for more secret messages to be sent.

Old Way
New Way
Compare Performance
Lower Quality Links
Higher Quality Links
Fewer Secret Keys
More Secret Keys