| Title | Beware of Greeks bearing entanglement? Quantum covert channels, information flow and non-local games |
| Publication Type | Conference Paper |
| Year of Publication | 2022 |
| Authors | Mestel, David |
| Conference Name | 2022 IEEE 35th Computer Security Foundations Symposium (CSF) |
| Keywords | channel capacity, compositionality, computer security, covert channels, Games, information flow, pubcrawl, quantum computing, Quantum entanglement, quantum information, resilience, Resiliency, Scalability, security |
| Abstract | Can quantum entanglement increase the capacity of (classical) covert channels? To one familiar with Holevo's Theorem it is tempting to think that the answer is obviously no. However, in this work we show: quantum entanglement can in fact increase the capacity of a classical covert channel, in the presence of an active adversary; on the other hand, a zero-capacity channel is not improved by entanglement, so entanglement cannot create 'purely quantum' covert channels; the problem of determining the capacity of a given channel in the presence of entanglement is undecidable; but there is an algorithm to bound the entangled capacity of a channel from above, adapted from the semi-definite hierarchy from the theory of non-local games, whose close connection to channel capacity is at the core of all of our results. |
| DOI | 10.1109/CSF54842.2022.9919683 |
| Citation Key | mestel_beware_2022 |
Beware of Greeks bearing entanglement? Quantum covert channels, information flow and non-local games