Science News
from research organizations

Visualizing the 'matrix': App provides insight into the quantum world of coupled nuclear spins

Date:
June 3, 2015
Source:
Technische Universitaet Muenchen
Summary:
Magnetic resonance tomography images are an important diagnostic tool. The achievable contrast depends on how well the nuclear spins that form the basis of the imaging signals can be controlled. Mathematically, the properties of nuclear spins are described by special matrices. Now a team of researchers has developed an intuitive graphical representation of the information contained in these matrices for coupled spins in arbitrary quantum states.
Share:
FULL STORY

Together with his son Niklas Prof. Dr. Steffen Glaser (Technische Universitaet Muenchen) developed an app that visualizes quantum-mechanical properties of spin systems in the form of three-dimensional, droplet like objects.
Credit: Steffen Glaser / TUM

Magnetic resonance tomography (MRT) images are an important diagnostic tool. The achievable contrast depends on how well the nuclear spins that form the basis of the imaging signals can be controlled. Mathematically, the properties of nuclear spins are described by special matrices. Now a team led by Professor Steffen Glaser at the Technische Universität München (TUM) developed an intuitive graphical representation of the information contained in these matrices for coupled spins in arbitrary quantum states.

Atoms and their building blocks adhere to the laws of quantum physics, which frequently boggle the mind. In our everyday world, a tennis ball can be rotated about its own axis at any arbitrary speed. Nuclear spins, on the other hand, can rotate only at a single fixed speed, either left or right -- their rotation is quantized.

A working group led by Professor Steffen Glaser from the department of Chemistry at the TU München is developing mathematical procedures to control the behavior of nuclear spins in a targeted manner with maximum efficiency. With the developed methodology the group has already succeeded in determining the optimal contrast for MRT images. Using their insights, the development of imaging processes can now be advanced further.

The exotic world of quantum phenomena

For future quantum computer technologies or technologies like nuclear magnetic resonance spectroscopy, one of the most important analytical tools in modern chemistry, a better understanding of the optimal control of coupled spins is essential. Here coupled spins can affect each other, leading to even more complex effects.

For example, a phenomenon known as superposition exists in the quantum world. Transferred into our everyday world, this would mean that nuclear spins can rotate both right and left at the same time. The entanglement of quantum states is a further example. Einstein referred to this effect as "spooky action at a distance." However, this "spookiness" bears great technical potential that ranges from precision measurements to secure data transmission.

A picture is worth a thousand words

The quantum properties of coupled nuclear spins are described mathematically using so-called density matrices. "These are abstract columns of numbers that require very much experience to recognize the information contained within them," says Steffen Glaser. Now Glaser has created a visualization tool that transforms these matrices into descriptive images.

The so-called DROPS (discrete representation of operators for spin systems) process maps the density matrix onto three-dimensional drop like objects. They reflect all quantum mechanical interactions and entanglements between the spins at a given point in time.

App for smartphone and tablet

To illustrate the creation, deformation and rotation of spin-spin correlations under the influence of controllable magnetic fields in real time, Steffen Glaser, together with his son, developed an app for smart phones and tablet computers.

"This program provides intuitive and comprehensible access to the fascinating world of quantum control theory for anyone dealing with the optimal control and utilization of quantum phenomena." The "SpinDrops" app is available as a free download in the App Store for all iPad and iPhone users.


Story Source:

Materials provided by Technische Universitaet Muenchen. Note: Content may be edited for style and length.


Journal Reference:

  1. M. Lapert, Y. Zhang, M. A. Janich, S. J. Glaser, D. Sugny. Exploring the Physical Limits of Saturation Contrast in Magnetic Resonance Imaging. Scientific Reports, 2012; 2 DOI: 10.1038/srep00589

Cite This Page:

Technische Universitaet Muenchen. "Visualizing the 'matrix': App provides insight into the quantum world of coupled nuclear spins." ScienceDaily. ScienceDaily, 3 June 2015. <www.sciencedaily.com/releases/2015/06/150603124541.htm>.
Technische Universitaet Muenchen. (2015, June 3). Visualizing the 'matrix': App provides insight into the quantum world of coupled nuclear spins. ScienceDaily. Retrieved May 26, 2017 from www.sciencedaily.com/releases/2015/06/150603124541.htm
Technische Universitaet Muenchen. "Visualizing the 'matrix': App provides insight into the quantum world of coupled nuclear spins." ScienceDaily. www.sciencedaily.com/releases/2015/06/150603124541.htm (accessed May 26, 2017).

RELATED STORIES