Oct. 19, 2023 (Bing) -- This is a very interesting question, and the answer is not straightforward.
Quantum entanglement is a phenomenon where two or more particles share a quantum state, such that their properties are correlated even when they are separated by large distances. This means that measuring one particle will instantly affect the state of the other, regardless of how far apart they are.
This has been called “spooky action at a distance” by Albert Einstein, who was skeptical of this idea.
However, quantum entanglement does not imply faster-than-light communication or causality violation. This is because the measurement outcomes are random and unpredictable, and the entangled particles cannot be used to send information without a classical channel. Therefore, quantum entanglement does not allow for time travel in the conventional sense of going back and changing the past.
However, some scientists have proposed ways to use quantum entanglement to simulate time travel or retrocausality, which is the idea that an effect can precede its cause. For example, researchers at the University of Cambridge have demonstrated that they can mimic what would happen if one could travel back in time by playing with entanglement1. They used a technique called “quantum entanglement manipulation” to show how one could retroactively change their previous actions to ensure the desired outcome.
The idea is to entangle two particles, A and B, and send particle A to be used in an experiment. Then, upon gaining new information, the experimenter manipulates particle B to effectively alter particle A’s past state, changing the outcome of the experiment. This process then links the past to the present, creating a feedback loop between them.
However, this simulation does not allow one to go back and alter their past, but rather to create a better tomorrow by fixing yesterday’s problems today. The simulation also has a high chance of failure, as it only works 25% of the time. Moreover, the simulation does not violate causality or break any physical laws, as it still requires a classical channel to communicate the new information.
Particles from the present cannot be entangled with particles from the past in a literal sense, but they can be used to simulate a form of backward time travel using quantum entanglement manipulation. However, this simulation is limited by randomness, probability, and causality constraints. It is also unclear whether this simulation has any practical applications or implications for our understanding of time and reality.
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