Communications of the ACM
Researchers Develop Method for Putting Quantum Correlations to the Test
An international research collaboration has identified a new technique for testing the quality of quantum correlations.
Credit: Swansea University
International research has yielded a new method for testing the quality of quantum correlations.
This can entail a massive amount of computational resources, as the number of measurements grows exponentially with the number of quantum bits (qubits) involved; the new technique reduces those measurements while boosting resilience against noise.
Farid Shahandeh of Swansea University in the U.K. said the approach combines a localization process that concentrates measurements in smaller parts of the quantum system, and the measurement of a suitable quantity to determine the existence of quantum correlations within a system.
Swansea physicists proved the conditional witnessing method is efficient and tolerates higher levels of noise in experiments overall.
Said Shahandeh, "This is of crucial importance in current technology where the addition of each qubit unavoidably amplifies the complexity of quantum states and experimental imperfections."
From Swansea University (U.K.)
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