Conventional batteries are based on the conversion of electrical energy into chemical energy with the participation of a large number of electrons. Unlike these, the proposed quantum batteries use the properties of quantum mechanics, where cause-effect relationships are not always direct.

The team of scientists emphasizes that the latest achievements in theoretical physics allow us to assume the following scenarios: Events can be both cause and effect at the same time within certain limits.

A very important role is played by the principle of quantum superposition, which allows particles to exist in various states until the moment of observation.

Quantum experiments, including those showing the existence of particles in multiple places at once, have challenged intuitive ideas about space and causality.

a quantum key

In 2009, physicists used the quantum switch to observe an undetermined causal pattern. By sending a photon down different paths and applying different processes depending on its path, they created a superposition in which both orders of events were correct.

Chen and colleagues applied this principle to quantum batteries by comparing three charging methods:

• consistent,
• simultaneous
• and a covering that hides the entry row.

Their calculations showed that the superposition method could deliver more energy more efficiently than traditional high-power chargers.

An important experiment

The team conducted a proof-of-principle experiment using light and a quantum switch. By splitting the light particles into two versions and subjecting them to different polarization processes depending on their paths, the researchers observed the cause-and-effect mixing of photons.

Although the researchers recognize the necessity of developing a physical quantum battery, they highlight current limitations in experimental studies and theoretical research in the field of quantum batteries. Considering that the first experimental data was published only last year, creating a practical quantum battery may take some time.