Quantum entanglement is dependent on the area




Two researchers from the computer center UCL and the University of Gdansk proposed a new method for determining the number of entanglements – quantum phenomenon linking the two distant partners, a critical step for quantum technologies – within a one-dimensional quantum system.

In a paper published this week in Nature Physics, Dr. Fernando Brandao (UCL) and Micah Gorodetsky (Institute of Theoretical Physics and Astrophysics, Gdansk) showed that the correlation between the particles in the sample decreases exponentially with increasing distance, entanglement between one region and the rest sampling part only depends on the boundary area between them.

Characterization of entanglement is essential for technologies such as quantum computing, quantum communication and quantum cryptography. Entanglement also makes it difficult to create a computer simulation of a quantum system. Opening scientists shows that a large class of quantum systems (with the exponential decrease of correlations) has a limited number of entanglements and so it can be easily simulated.

The relationship between the area and complexity long assumed scientists in this field intuitively if a correlation between the particles in the system decreases with distance, so only close particles entangled with each other. Thus, the particles are far from the border, just do not participate in the confusion, and only the area of ​​the border will make a difference.

However, this curious idea has been undermined by the existence of a counterexample. Even when the two regions are separated by a wide layer that has cut all types of communication between the particles, the observers can not know the exact number of entangled particles as if they were completely isolated. This phenomenon of “data hiding” is a key feature of entanglement, because in such a system, the knowledge of one partner affects the measurement parameter of the other.

The work of scientists solves all these problems by integrating recent findings from the theory of quantum information and is especially designed for the analysis of quantum communication protocols, and showing that the concealment of data can not be stored at the same time exponentially decaying correlations found in all parts of the system.

Dr. Brandao says:

“We are very pleased that we were able to bring this method. He argues that seemed intuitively correct, and is also the reason why the truth is slightly different from the predicted intuitively. The result helps us to identify cases of low involvement. They are good candidates for simulation on classical computers that are unable to simulate the effects of quantum phenomena. ”

Dr. Gorodetsky agrees with his colleague:

“What I particularly like about this result, since it is possible for the first time in this area we have only used information-theoretic methods, without assuming any specific physical properties of the system. Therefore, the result is very general. ”

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Tags: Quantum entanglement , quantum computer , physics , elementary particles .

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