Negative time is measured in photons.

“A quantum physics experiment showed photons can exhibit negative dwell time while traveling through atoms. Scientists confirmed the phenomenon using weak measurements that minimally disturbed the system. Credit: Shutterstock.” (ScitechDaily, Physicists Have Measured “Negative Time” in Bizarre Quantum Experiment)

The measurement was made when photons traveled through the radium atom cloud. In that measurement, the photons arrived at the goal. Before they should. This thing happened. Because at some point, those photons crossed the speed of light. That point is the radiation field around those radium atoms. This means that. The speed of light is different. In that radium atom cloud than outside it. The radium is highly radioactive material. Those atoms send gamma rays. This is the reason. For why that time effect is seen in radium atom clouds. But not in stable atom clouds. 

There is also beta and alpha decay. But in this case, the key element is the gamma rays. Those gamma rays change entropy in the system. And that forms space. There, the speed of light differs from the environment outside that atom cloud. In normal cases, the speed of light is always the fastest. Or, nothing can travel faster than a photon. But the speed of light depends on the environment. In vacuum, the speed of light is 299792458 m/s. In water, the speed of light is 225000000 m/s. 

The lack of entropy makes it possible to create the “hyper drives” and tractor beams. And in the radium atom cloud. Gamma rays can decrease the entropy. And they can also transfer energy to those photons. 

Crossing the speed of light. It is quite an easy thing.  Researchers must only form space. Or an environment where the speed of light is faster than around it. The idea of the wormhole, or the Einstein-Rosen bridge, is this. The entropy in that environment is lower than the entropy outside it. And that allows light to travel faster. Than outside it. In the same way, near black holes. 

Light can travel faster than outside it because quantum whirl around that object decreases entropy. The black hole rolls quantum fields inside it. The whirl around it decreases crossing entropy. And the reason why nothing can escape is the energy that comes back from the object. When we think about space and time (spacetime) in the universe. That environment is full of whirls. Rocket engines pull against those whirls. Without those whirls. The engine pushes against nothing. Without resistance, the engine cannot create thrust. 

The reflected energy pushes them forward. If there are no whirls in the quantum fields. The rocket engine cannot push against them. Things like sci-fi stuff like hyperdrive and tractor beam (pulling rays) will just remove entropy from the front of the craft. Or the tractor beam would make a very low-energy channel with minimum entropy. And if there is a higher-energy bubble ahead of the object than the receiving object. That bubble pushes the object into that channel. The craft cannot escape. Because there is nothing the rocket engine can push against. 

In the same way, things like “hyperdrives” form an area. There. The entropy is minimal. The system. It can use the gamma rays to create a tube. There, entropy is very low. That gamma-ray tube pulls the craft into it. 

So, if we want to cross the speed of light, we must just shoot a particle into water. By using a speed higher than the speed of light in water. In the same way, when particles arrive in the atmosphere. They can hit air at a speed higher than the speed of light in the air. When a particle slows down. It must remove its kinetic energy. We see that thing as a blue light flash. Known as Cherenkov radiation. This is why the sky is blue. And the Cherenkov radiation is the reason for the blue glow around the nuclear reactor. The entropy. Or chaos in the system is one of the reasons. For why photons cannot travel faster than they do. The quantum fields in the vacuum are full of whirls. 

That means that the quantum fields are full of energy hills and energy valleys. The lower energy areas. Around those, quantum fields pull energy out from particles. So, gamma rays from radium atoms remove some part of those whirls. That decreases entropy. And this means that. The photon that traveled through that atom cloud traveled faster. Than it should. The idea of the wormholes is also simple. The Einstein-Rosen bridge forms the environment or quantum tube; there, radiation travels in one direction. As I just wrote. 

The Einstein-Rosen bridge is the environment. There, the entropy is minimal. When radiation travels only in one direction. The entropy. Or disorder in the system will not break or pull energy out from particles. 

So, measurements. Did not match the calculations. Those things might seem very small. But over long distances, measurements required extreme accuracy; things like radioactive materials can distort the results. 

https://scitechdaily.com/physicists-have-measured-negative-time-in-bizarre-quantum-experiment/

https://en.wikipedia.org/wiki/Cherenkov_radiation

https://en.wikipedia.org/wiki/Entropy

https://en.wikipedia.org/wiki/Speed_of_light

https://en.wikipedia.org/wiki/Wormhole

https://medium.com/@TVvman/negative-time-is-measured-in-photons-7bc73ea0592c