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Experts move a step closer to the demystification of the quantum world



  Experts move one step closer to the demystification of the quantum world
Optical realization of the simplest possible method for the simultaneous measurement of two incompatible observable unit cubes. The measurement strategy, illustrated here, was used to sensitize the fundamental uncertainty relation for simultaneous quantum measurements and is applicable to quantum metrology and other new photonic quantum technologies. Copyright: Adetunmise Dada

The quantum world is a known complex, its numerous layers and minimal components go beyond standard analytical approaches.
One of the principles underlying many impressive quantum phenomena is that there is an internal limit of accuracy with which we can simultaneously know certain pairs of properties of the quantum system, which are called "complementary"

For example, the more accurately you know the position particles, the less you can accurately know its speed, and vice versa. In fact, the more precisely one of these properties is determined, the less we can be with the corresponding property ̵

1; knowing the exact answer in one case only increases the challenge of getting a complete picture.

Then the picture requires compromise – to align the accuracy of the definition of one property for greater accuracy in relation to the other. However, the achievement of the best complete picture permitted by the "constraints" established by the laws of quantum physics is a difficult task.

Now Bristol University experts believe they have demonstrated a much easier way to get around this challenge. Their work, published in the Optica magazine, could have implications for future information security, biomedical science and other areas of research, where complex achievements increasingly rely on the ability to include and measure the properties of quantum systems.

A solution developed by researchers from the Bristol Quantum Engineering Technology Labs includes a specially developed optical fiber that can generate single photons in the specified mode, allowing them to measure one photon at a time, using an elegantly simple measurement based on a flip-coin analogue. . Their experiment simultaneously determined two additional polarization properties of one photon and reached the best "complete picture" permitted by the restrictions established by the laws of quantum physics.

"Until we cope with this, it was not known that such quantum-limited simultaneous measurements per photon qub may be implemented with basic installation in such a simple way," said Dr. Adultmin Dad, Senior Researcher at the British Laboratory Quantum Engineering Technology and lead author of the article.

"Our results indicate the extent to which we can learn about the complementary properties of quantum systems using practical measurement settings. It also depends on how well we can rely on information security delivered by quantum protocols in real-world implementations, since the same principles control the limits of information that can be undermined by the eavesdropping signal in the distribution of quantum keys.

Further, the study also plans to extend the limits of quantum understanding even further by checking whether their methodology can be applied to the measurement of several incompatible properties and in large-scale quantum states implemented on the silicon integrated optical platform, which is a promising approach for the implementation of multidimensional quantum States, encoded in the degree of freedom of single photons.


Explore further:
Rigid restrictions on the post-electricity of the optical states of the graph

Additional information:
Adetunement C. Dada et al. Optimal simultaneous measurement of incompatible observed individual photons, Optica (2019). DOI: 10.1364 / OPTICA.6.000257

Reference of the journal:
Optics

Granted:
University of Bristol


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