Quantum nonlocality is possible in the triangle network with no inputs and binary outputs, which is the smallest such scenario by number of variables and outcomes.
Device-independent security of quantum cryptography against collective attacks
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abstract
We present the optimal collective attack on a Quantum Key Distribution (QKD) protocol in the "device-independent" security scenario, where no assumptions are made about the way the QKD devices work or on what quantum system they operate. Our main result is a tight bound on the Holevo information between one of the authorized parties and the eavesdropper, as a function of the amount of violation of a Bell-type inequality.
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2026 2verdicts
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Generalized partial joint-measurability of quantum measurements is equivalent to perfect classical guessing by an adversary with side information and is decidable via a single semidefinite program, producing analytical bounds on detection efficiency for quantum cryptography.
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The minimal example of quantum network Bell nonlocality
Quantum nonlocality is possible in the triangle network with no inputs and binary outputs, which is the smallest such scenario by number of variables and outcomes.
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Generalized measurement incompatibility
Generalized partial joint-measurability of quantum measurements is equivalent to perfect classical guessing by an adversary with side information and is decidable via a single semidefinite program, producing analytical bounds on detection efficiency for quantum cryptography.