CAN WE TIME TRAVEL USING QUANTUM COMPUTERS?

Do you ever find yourself in a Wild West-style laser duel with an enemy spacecraft, where whoever shoots first wins?

What if I told you that a group of scientists (a murder of physicists?) devised a way for you to manipulate the very fabric of time and space so that you both die regardless of who fires first? Perhaps, when it comes to developing quantum computers, this isn’t probably the best pitch you've heard. It is, nevertheless, a fascinating story.

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The researchers have discovered “a new kind of quantum time order,” according to the researchers, who are led by scientists from the University of Queensland. It's like time travel, except instead of you, it's for the world. The study examines a thought experiment in which an object large enough to influence local gravity is put in a quantum superposition while a sequence of events unfold.

Consider two spaceships being asked to fire at each other at a specific time while avoiding the other's attack.

Both will be destroyed if one of them shoots too soon.

According to Einstein's theory, a strong adversary could use general relativity to slow down the passage of time by bringing a large object closer to one ship, such as a planet. Due to the time difference, the ship furthest away from the giant object would fire first, crushing the other.

However, Einstein's relativity theories are just half of the puzzle. Quantum mechanics is responsible for the rest. Any particle – even an entire planet – should be able to be put in a state of superposition, according to quantum mechanics, the dominant theory on how our universe functions.

What is superposition?
Superposition is a quantum phenomenon in which a particle or system – in this case, a planet – exists simultaneously in two distinct physical states. Schodinger's Cat, a thought experiment, was the perfect way to describe this. Consider a superposition particle like a spinning coin: once it lands, it is both heads and tails.

According to the researchers, these quantum effects would theoretically apply to time if the planet next to one of the spaceships was set in a state of superposition.

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Continuing Zych’s narrative, there will be a new way for events to occur, with no case being first or second, but instead in a true quantum state of being first and second.

In other words, regardless of who shot first, the quantum state of the world will have a larger impact on how the events played out – my prediction is that all spaceships explode and then the lasers go off like sad space confetti a few seconds later.

All of this may seem unlikely, but as any Douglas Adams fan knows, time travel is only improbable, not impossible. And that's something we'll be able to deal with. This bizarre thought experiment (and the math that supports it), according to Zych, has the potential to directly influence the advancement of quantum computers in the future. Science Daily quoted her as saying:

“We're currently working on quantum computers that, to put it simply, can leap through time to perform operations much more quickly than machines that operate of a fixed sequence in time, as we know it in our "natural" world.”

Traditional computers must follow a set of instructions. If that's the case, then proceed; that's how it works. Theoretically, quantum computers could simply “goto” the solution. It's a little more complicated than that, but scientists are basically writing the laws of the universe in real time in 2019, and will continue to do so in the far future.

What can a quantum computer do?
A researcher discovered a few years ago that a (time travelling) quantum computer can solve a variety of problems, including the NP-Complete problem. Closed timeline curves, also known as paths between space and time, were introduced by Einstein's theory of relativity. A traveller will connect with his or her history if we follow the closed timeline curves. Coordination of these closed timeline curves with quantum mechanics is a major challenge that has been attempted several times.

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Regardless of whether or not there is a closed timeline curve in spacetime, quantum computation facilitates a variety of phenomena.

Time travel can be thought of as a quantum-based communication channel to the backward direction of spacetime. Quantum Teleportation is one of the earliest examples of a communication channel. Quantum measurement, when combined with mutual entanglement and communication, enables quantum states to be sent and received. And, by combining quantum teleportation with post-selection, a contact channel can be used to travel back in time. The quantum calculation is replaced by the post-selection due to entanglement on both the forward and backward sections of the curve, obviating the need for a communication channel, which gives rise to time travel.

Conclusion

We can now conclude that quantum mechanics' goal(and of quantum computers) in the time travel concept was to focus on the similarities and differences among various time travel quantum theories. Researchers have been attempting to determine the role of quantum mechanics in time travel for many years, and the quest is still ongoing. As a result, it entails massive and complex mathematical computations that correspond to established theories about space and time.

REFERENCES:

https://www.nature.com/articles/s41467-019-11579-x

https://www.c-sharpcorner.com/article/is-quantum-computing-used-in-time-travelling/

https://www.forbes.com/sites/fernandezelizabeth/2019/09/09/could-quantum-gravity-allow-us-to-time-travel/?sh=6b8c29a52f2a

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