Cryptographers are examining quantum jamming to address causality in secure communications.
The topic focuses on maintaining security in a post-quantum environment by studying cause and effect principles.
Physicists at MIT have developed a theoretical technique inspired by the film Interstellar to send messages backwards in time using quantum entanglement. The approach mimics closed time-like curves and surprisingly improves communication through noisy channels. While actual time travel remains impossible, the idea could enhance conventional systems.
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Physicists at the University of Vienna have conducted an experiment demonstrating a superposition of different temporal orders in quantum events, using entangled photons and a Bell inequality equivalent. The results deviate significantly from classical expectations, suggesting indefinite causal order is a fundamental quantum feature. However, several experimental loopholes remain open.
Researchers at Los Alamos National Laboratory have developed a method to effectively reverse time in quantum systems, enabling energy harvesting for potential use in quantum batteries. The technique counteracts the effects of measurements on qubits, making systems appear to run backwards. This could turn measurements into a thermodynamic resource.
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Andrew Gault warns that bitcoin faces a greater quantum threat from encrypted messages moving between institutions than from exposed wallet keys. He points to a harvest-now-decrypt-later strategy already in use by adversaries.