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14h ago
Sending short messages back in time may not break the laws of physics
- Scientists derive exact backward-channel capacity for noisy retrocausal communication, giving concrete limits for information sent back in time.
- Amplified probabilistic teleportation is identified as the optimal one-shot strategy for retrocausal communication.
- The scenario uses a daughter in the past storing quantum information and a father in the future encoding after retrieving that memory.
- The model enforces self-consistent histories to avoid paradoxes in backward-time signaling.
- Findings link retrocausal limits to black-hole information questions, including final-state evaporation models.
- The work provides exact one-shot capacities and asymptotic limits for repeated uses of the channel.
- Noisier real-world channels are handled, moving beyond idealized, perfectly noiseless backward time models.
- The study references black-hole evaporation links, notably Horowitz–Maldacena final-state proposals.
- Practical takeaway: researchers can calculate retrocausal information ceilings for realistic noisy channels.
- The article ties the theory to experiments using postselected teleportation and entangled photons.
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