Quantum

From Claws to Conferences: Device-Independent Key Agreement Beyond Non-Signaling

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Briefings

A new quantum protocol achieves device-independent key agreement by treating all device interfaces as a single untrusted component, removing the non-signaling assumption. The authors prove finite-size security against coherent attacks using an everlasting security guarantee where LWE hardness is required only during execution, not after the protocol concludes.

Key points

• The protocol removes the non-signaling assumption by treating all device interfaces as one untrusted device, requiring only quantum polynomial-time execution.
• Security is certified against coherent attacks using a GHZ-correlated claw state prepared with one coherent claw-free function evaluation and N-1 CNOT gates.

Context

This research advances device-independent conference key agreement by eliminating the need for non-signaling assumptions in multipartite Bell tests, offering a more robust framework for secure quantum communication.

Limitations

Security relies on the Learning With Errors problem being hard for quantum algorithms with quantum advice; the protocol's everlasting security depends on LWE holding only during execution, not persisting after the protocol ends.

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