Transmigrator's Guide to Conquering Another World

In 1935, Einstein, Podolski, and Rosen proposed a very famous thought experiment.

Later generations referred to it by their initials as the EPR experiment.

This experiment refers to preparing two particles, A and B, in a "circle" state, so that a certain property of these two particles (such as the spin angular momentum of electrons or the polarization of photons) adds up to zero, while the property of an individual particle is uncertain.

Such a pair of particles is called an "EPR pair" and belongs to the "entangled state" in quantum mechanics.

The original purpose of the EPR experiment was actually to support Einstein's own point of view, but ironically, in 1980, Aspect and others performed the EPR experiment and confirmed that the EPR phenomenon was indeed a real effect.

This is also a notable point for relentless critics of Einstein,

However, they completely ignore that if one only focuses on the results of quantum mechanical measurements, EPR correlation does not transmit information faster than light, a problem only arises when treating the wave function as a physical reality.

The topic returns to the EPR phenomenon.

It is precisely based on the EPR phenomenon being unwaveringly confirmed as true that we have the experimental foundation for quantum teleportation.

As is well known,

The basic idea of quantum teleportation is as follows:

Let the third particle C and B form an EPR pair, with C very close to A and far away from B.

Let A and C interact, changing the state of C, which causes the state of B to also change accordingly.

At this moment, the state of the two-particle set of A and C has four possibilities, corresponding to the strings 00, 01, 10, and 11.

The state of B also has four corresponding possibilities, each resembling the initial state of A (i.e., the target state you wish to transmit) to some extent, which can be transformed into the target state through certain quantum mechanical operations.

Doing a measurement on the whole of A and C, A and C then randomly mutate into one of the four states, 00, 01, 10, or 11, and B also mutates into the corresponding state.

Now you've obtained a two-bit string, 00, 01, 10, or 11, which you can understand as a password.

Transmit this password by classical means of communication (such as telephone or optical cable) to the person on B's side, and perform operations on B according to the password to obtain the initial state of A.

The particles in this experiment are photons, and the whole experiment embodies the concept of quantum teleportation.

It's not complex and quite easy to understand.

And speaking of quantum teleportation, a misconception must be addressed.

Many regard quantum teleportation as instant transmission, believing it doesn't take time to transmit to infinite distances.

Then they proclaim this overturns relativity, Einstein is garbage, and amateur scientists are the best!

Some even think this trick allows information transmission speeds to exceed the speed of light, enabling instant conversations with Tiga from the Land of Light about how much salt to add to bone broth.

This is completely wrong.

Indeed, states of different particles can indeed mutate without taking time through measurement, but just this step alone does not achieve the target state.

To know what operations to perform on B to obtain the target state, one must transmit the two-bit string, which requires classical communication.

And classical communication cannot exceed the speed of light, so quantum teleportation cannot surpass it either.

Therefore, it doesn't violate relativity; Einstein is still an eternal giant.

Currently, the world's quantum teleportation was realized in 1997, when Pan Jianwei was pursuing his Ph.D. with Professor Zeilinger at the University of Innsbruck in Austria.

They published an article titled "Experimental quantum teleportation" in Nature, with Pan Jianwei being the second author.

This article was later selected as one of the "21 classic papers in a century of physics" by Nature.

Alongside it were discoveries like Roentgen's X-rays, Einstein's establishment of relativity, Watson and Crick's revelation of the DNA double helix structure, among others—an intimidatingly formidable lineup.

The importance of this article in the related field is akin to the significance of the Battle of Stalingrad in World War II.

For those who follow scientific information closely, you may remember a piece of news from 2015:

The University of Science and Technology of China led by Pan Jianwei achieved a significant breakthrough in quantum instant transmission technology.

This achievement was later recognized as the top physics breakthrough of 2015 by the British Institute of Physics and the top scientific advancement in China in 2015 by the Ministry of Science and Technology of China.

Indeed, it was Pan Shuai again. (He was also my mentor, though I later switched to high-energy physics.)

In 1997, Pan Jianwei achieved quantum teleportation of a single photon's single degree of freedom, while in 2015, he accomplished it for multiple degrees of freedom of a single photon.

So, those who claim that there is no talent in official physics of Huaxia are indeed ignorant and biased.

Let's return to quantum teleportation.

Huaxia's "Lao Zi" has a saying: 'The Tao gives birth to one, one gives birth to two, two gives birth to three, three gives birth to all things.'

Today, domestic quantum teleportation can be said to have achieved 'the Tao gives birth to one and one gives birth to two and two gives birth to three,' but it is still very, very far from 'three gives birth to all things.'

Because this 'all things' is indeed too vast.

12 grams of carbon atoms is 1 mole, which is 6.023*10^23.

If a person's weight is 60 kilograms, that's approximately 5000 moles of atoms, which is about 3*10^27 atoms.

Let's assume describing an atom's state requires ten degrees of freedom.

To describe a person, we'd need 10^28 degrees of freedom—those unfamiliar with the concept of degrees of freedom could think of this in terms of money.

However, the most challenging part of any endeavor is taking the first step, and now the research field has completed the 'the Tao gives birth to one,' the most difficult problem, and what's left is wholehearted research.

Under normal circumstances,

Humans would need another 2-300 years to achieve space transmission at the hundred-kilometer level, and planetary-level spatial transmission might require 5-800 years.

But now, with the teleportation array appearing in the Damo Realm, it may allow the rabbits to make advances in this area ahead of time!

Therefore, the headquarters, upon learning that the command post will transport equipment via a convoy, has also shown great importance to this teleportation array attempt.

Not only was the most precise long-range optical particle receiver from the Southern China Region mobilized, but the supercomputer "Zhou Bi" was also urgently dispatched.

According to the command post's arrangement,

The main measurement tasks for Zeng Gu Cheng's team this time are as follows:

Firstly, through an entangled pair of particles, measure an unknown photon's state with the photon's transmitted from the sender outside the teleportation array.

The collapse of the received photon's superposition state reveals a state opposite to the sender's quantum degrees of freedom, that is, performing joint measurement.

Under normal circumstances, the results of joint measurement need to be sent through traditional channels.

But considering it's impossible to lay cables around the teleportation array, the physics team this time will use a remote single-photon source to exchange information.

In layman's terms, it means:

Test personnel carrying a high-efficiency entangled source position two points in the teleportation array using a six-photon entangled state, and under the guise of transporting goods, another Bell state observation ring is distributed within the array.

Then, with the assistance of external equipment, confirm whether the teleportation array operates on the principle of quantum teleportation or quasi-quantum teleportation.

If it doesn't, then the related research will be extremely challenging.

It's like what was mentioned before, 'the Tao gives birth to one' is the hardest step, no matter what kind of Tao it is or what it gives birth to, it will be extremely difficult.

But if it can be confirmed that the teleportation array in the Damo Realm is driven by quantum teleportation...

Don't forget, at the beginning Zeng Gu Cheng and his team measured

that the GZK limit in the Damo Realm and the universe Earth is in are consistent, meaning that the speed of light is the same.

Then the subsequent research will be much easier.

Even though it still might take a very, very long time and face many challenges.

At least it won't be following a completely uncharted path, avoiding the need to pave a way through the wilderness.

Perhaps due to some unknown anticipation, this mission to collect teleportation array information has been named by the core layer:

Nine Chapters!