Many modern technological advances and devices are based on understanding quantum mechanics. Compared to semiconductors, hard disk drives or lasers, quantum devices are different in the sense that they directly harness quantum states. A big goal of the field is to develop a working quantum computer theorized to outperform traditional computers in certain difficult computational tasks. Researchers at the University of Oulu and Aalto University have published a review article about physics related to quantum devices in Reports on Progress in Physics.



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A central concept in quantum mechanicsis that of energy level. When a quantum mechanical system such as an atom absorbs a quantum of energy from light, it is excited from a lower to a higher energy level. Changing the separation between the energy levels is called frequency modulation. In quantum devices, frequency modulation is utilized in controlling interactions, inducing transitions among quantum states and engineering artificial energy structures.





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"The basis of quantum mechanical frequency modulation has been known since the 1930s. However, the breakthrough of various quantum technologies in the 2000s has created a need for better theoretical tools for the frequency modulation of quantum systems," says Matti Silveri, presently a postdoctoral researcher from University of Oulu.

Understanding and using frequency modulation is important for developing more accurate quantum devices and faster quantum gates for small-scale quantum computers in the near future. The research field of quantum devices and computing is rapidly growing and it has recently attracted investments from major technology companies such as Google, Intel, IBM and Microsoft.

"We wanted to review the recent experimental and theoretical progress with various kinds of quantum systems under frequency modulation. We hope to accelerate the research in this field," says docent Sorin Paraoanu from Aalto University.

The article discusses the physics of frequency modulation in superconducting quantum circuits, ultra-cold atoms, and nitrogen-vacancy centers in diamond and nano-electromechanical resonators. With these platforms, energy levels can be accurately modulated with voltage, microwaves or lasers in experimental settings. The theoretical results of the article are general and can be applied to various quantum systems.

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Source: phys & techziffy