Researchers Control Information Loss in Quantum Computing

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Researchers from University of Turku found an approach to restrict the disappearance of quantum information

Quantum mechanics offers convenient and fast method to encrypt and store information. However, occasional disappearance of information in quantum computing is a major disadvantage. Now, an international team consisting of Finnish and Chinese researchers found a method to control the information escaping the quantum bit (qubits). Quantum mechanics defines minute physical systems such as photons that are the quantum-mechanical equivalents to classic bits. Decoherence and quantum noise often results in disappearance of fragile information stored in the form of qubits. This leads to leakage of information into the environment and disappear completely.

It is important to understand the mechanism of disappearance of quantum information for the purpose of basic research and technological applications. The research conducted by the Turku Centre for Quantum Physics at the University of Turku and the University of Science and Technology of China revealed in theory and experimentally the mechanism that can control the information flow from the qubit into the environment. Moreover, the team proved that in some cases, the disappearance of quantum information can even be prevented. The researchers focused on exploring the properties of photons and theoretically understanding the approach to create an adequate connection between the polarization and frequency of the photon in the beginning. The findings were then then implemented in laboratory using extremely refined and challenging experimental techniques.

The researchers found that it was possible to arbitrarily control or retrieve the disappearance of information carried by the qubit when the photon serving as the qubit and its environment have first been initialized into the right state. Moreover, the information can be trapped or protected from disturbances. According to the researchers the findings are significant for basic research and developing quantum technologies. The research was published in the journal Nature Communication on September 13, 2018.

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