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Improved quantum control thanks to math

EU-funded research has devised novel formulations of causal relationships on a quantum scale. The theoretical instruments will make an important contribution to the fundamental understanding of quantum physics as well as to the development of quantum components.

Quantum systems are being developed for numerous applications, including high-precision measurement and control technology, for computing and for generating light. With their work on the project "Quantum control and error correction with discrete and continuous variables" (QCEC), EU-funded scientists wanted to develop novel methods that are compatible with the quantum world.

QCEC's contribution consists in results with significant implications for the foundations of quantum theory, quantum information processing and the fundamental problem of unifying quantum theory with general relativity. An important question examined was causal order, one of the most fundamental concepts of our universe and time, which essentially requires an effect to follow the cause.

Scientists reported in Nature Communications that using a new framework they developed, quantum correlations without causal order can occur. They also showed that there is always a causal order within classical boundaries, which suggests that space-time can grow out of a more fundamental structure. Building on this, an extensive study developed an operational formulation of quantum theory without a predefined time or causal structure. The framework can also describe exotic causal relationships that are expected to exist in the context of quantum gravity.

An important difference between quantum control and classical control is that the measurement itself changes the dynamics of the system and noise and non-linear components are introduced. Scientists made great strides in quantum feedback control and error correction, providing new tools to manipulate quantum information and protect it from noise.

The development of quantum components for a variety of applications in basic research and industry has become the focus of more and more research areas. The QCEC results in terms of causal ordering, feedback control and error correction in quantum systems are extremely important and relevant. Exciting new discoveries and developments can be expected in the near future.

Last Date Modified: 2015-03-17 07:37:13