Researchers made the record-breaking breakthrough in Schrödinger's cat state.

Above is the image of the Schrödinger's cat state. A cat that is alive and carries information is closed in the cube that protects it. The cube itself doesn't carry information. And that makes Schrödinger's cat state seem dead. The outside observer cannot see the information that the cat carries in the hidden USB stick. 

Schrödinger's cat state is a thought experiment about a creature that is alive and dead, at the same time. That state can turn into a model where the particle or creature carries information and doesn't. That makes Schrödinger's cat state interesting. In quantum networks, data is stored in physical things called qubits. 

We can replace the words dead and alive. Using the words interesting and boring states. Interesting states carry interesting information. And boring states don't carry information. 

How do we protect physical information like letters? We simply put them inside the envelope. So that nobody sees it from the outside. So we can put the qubit into another particle so that outsiders cannot see the message transporter from the outside. The qubit can have both states 0 and 1 at the same time. That means. We can cover the qubit with zero and that makes it dead. Dead particles are not interesting. 

Because it doesn't carry information. Particles are alive when they are interesting. And interesting particles carry information. In the quantum system, the ability to steal information is physically denied. If somebody wants to read information from the qubit that destroys it. And the information will not reach the receiver. 

The model can be the qubit that is stored in another particle. The particle that carries qubit can seem "dead". So it doesn't carry information and the catcher will not see that particle as interesting. But the interesting or "alive" particle is inside that outside particle. The problem is to separate the right particles from the flow. The system must remove the particle or shell that covers the information carrier. 

The qubit is safe because it's single-use. If somebody tries to transfer data out from qubit that erases data immediately. Data that qubit carries is also encrypted for the receiving system's that it can route data to the right points. And if the wrong qubit transfers data in the wrong gate that destroys the information. 

The answer can be that the system knows what the right particle or information carrier looks like. When we think about cats that carry USB sticks we can use many cats in that work. But all of those cats don't carry important information. We can have workers who capture those cats and take the USB sticks. But then only. The most trusted workers can get the USB stick with ultra-high secure data. 

So the cat must have details like black and white fur. That the worker recognizes the cat that carries important data. The idea is that if the wrong worker takes the unauthorized USB stick it destroys the data immediately. Same way when a quantum system tries to download data from the qubit that destroys the data. The receivers must not try to download the wrong data types because that erases data from the qubit.

 https://scitechdaily.com/quantum-breakthrough-scientists-create-schrodinger-cat-state-with-record-long-lifetime/

https://en.wikipedia.org/wiki/Schr%C3%B6dinger%27s_cat