Device-independent quantum key distribution from computational
assumptions
- URL: http://arxiv.org/abs/2010.04175v3
- Date: Fri, 29 Jul 2022 09:06:33 GMT
- Title: Device-independent quantum key distribution from computational
assumptions
- Authors: Tony Metger, Yfke Dulek, Andrea Coladangelo, Rotem Arnon-Friedman
- Abstract summary: We show how to replace the no-communication assumption in DIQKD.
We give a protocol that produces secure keys even when the components of an adversarial device can exchange arbitrary quantum communication.
- Score: 7.006301658267124
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: In device-independent quantum key distribution (DIQKD), an adversary prepares
a device consisting of two components, distributed to Alice and Bob, who use
the device to generate a secure key. The security of existing DIQKD schemes
holds under the assumption that the two components of the device cannot
communicate with one another during the protocol execution. This is called the
no-communication assumption in DIQKD. Here, we show how to replace this
assumption, which can be hard to enforce in practice, by a standard
computational assumption from post-quantum cryptography: we give a protocol
that produces secure keys even when the components of an adversarial device can
exchange arbitrary quantum communication, assuming the device is
computationally bounded. Importantly, the computational assumption only needs
to hold during the protocol execution -- the keys generated at the end of the
protocol are information-theoretically secure as in standard DIQKD protocols.
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