We do have many theories on how to travel backwards in time and they do work in theory but one thing i’ve noticed is that they always have a need for things that carry intense energy-mass like black holes,ctc’s etc.Do we actually have a theory that doesnt needs any large amount of energy to work?(its okay if they’re just speculations)
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Hello VonCatastrophe 
Welcome to the Forum/Boards. Not yet, we are working on it hopefully tho. Any ideas you have would be a great help? 
~QS
Seth Lloyd, a physicist at MIT, developed a way to think about time travel that avoids both the giant energy requirements of wormholes and the paradoxes that plague classic time-travel stories like the “grandfather paradox.” Instead of imagining an actual tunnel through spacetime, he modeled a trip to the past using quantum teleportation — the same technology used to transmit quantum information between entangled particles — combined with a trick called “postselection,” where you only pay attention to the outcomes that turn out to be self-consistent and simply discard the rest, as if nature automatically filters out any version of events that would create a contradiction. In this picture, you could never actually kill your own grandfather, not because some mysterious force stops your hand, but because any timeline where that happened is one of the discarded, “impossible” outcomes — only the paradox-free timelines ever get counted as real. It’s a purely theoretical framework, tested only in miniature using laboratory setups with entangled photons rather than real time machines, but it offers physicists a mathematically consistent, refreshingly low-energy way to explore what quantum time travel might look like.
Seth Lloyd starred in a short science-fiction film called Steeplechase (2022), directed by Andrey Kezzyn. The film follows two physicist collaborators who use a quantum computer to simulate a projective closed timelike curve — the mathematics of time travel — using themselves as the frame of reference. Lloyd plays a scientist character alongside Dr. Michele Reilly, and it’s a stylized, fictionalized dramatization rather than a documentary. It’s described as a story where two scientists must discover the quantum mathematics behind “time-consistent” travel, with a quantum computer performing tests related to artificial general intelligence, and the protagonists using quantum teleportation to dematerialize particles in the future and rematerialize them in the past to achieve time travel.
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