Researchers measured time in a quantum system without a clock.

"Time at the quantum level may be far less mysterious than it seems. Physicists have found a way to measure how long ultra-fast quantum events actually take—without using a clock at all. Credit: Shutterstock" (ScitechDaily, Physicists Measure Time Inside Quantum Events Without a Clock)

When researchers measure time in a quantum system, they cannot  use a clock. One of the reasons for that is that the clock must be positioned in the system. Another thing is that. Every quantum system distorts time. The measuring quantum system is difficult. Because the measurement tool. Must not touch it. The system has no time to see. When the reaction begins, start the timekeeping. And stop the clock when the system sees. The end of the reaction. Things. The surrounding energy level and quantum evaporation in the system determine the time in the system. 

Measurement of time without a clock is very difficult. But researchers measured time in a quantum system without a clock. One of the most important things in the measurement. It is. Important to realize that the time in a single quantum particle is not the same as the time in the entire system. When the spin of the particle accelerates, time moves more slowly for it. But if the particle suddenly slows its speed, it delivers energy to its environment. And that also increases free energy in the quantum system. 

“At the quantum scale, events unfold at speeds that are hard to comprehend. Processes such as tunneling or an electron jumping to a new energy state after absorbing light can occur in just a few tens of attoseconds. That span is so brief that even light would not be able to cross the width of a small virus in the same amount of time.” (ScitechDaily, Physicists Measure Time Inside Quantum Events Without a Clock)

The measurement happens by comparing the spin of the electrons and photons. Or the system doesn’t measure the spin of the particle. It follows the routes. By which photons excite and de-excite particles. Those routes through which excitation happens differ. And those routes disturb each other. That causes a difference in the spin. 

 “When light excites an electron, the process does not follow a single path. Instead, multiple quantum pathways are possible. At the same time. These paths interfere with one another, and that interference leaves a distinct signature in the spin of the emitted electron. By tracking how this spin pattern changes with the electron’s energy, the researchers could calculate the duration of the transition itself.” (ScitechDaily, Physicists Measure Time Inside Quantum Events Without a Clock)

The knowledge of how time affects. Entering quantum systems increases the knowledge of that strange world. We can say that every time a particle delivers energy to another particle, time moves more slowly in the receiving particle. When a particle delivers energy, time moves faster in the particle. This makes calculations quite difficult. When a particle travels through an energy shell, it receives energy. And that wobbles time in that particle. These kinds of things can cause situations where energy travels out from a particle. Faster than usual. That increases free energy in the system. 

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