Scientists have developed a quantum algorithm to accurately measure physical quantities using simple optical instruments.
Sensitivity measuring instruments hascrucial in various fields of science and technology. Previously, no instrument could provide accuracy above the shot noise limit due to the natural fluctuations of the systems. However, recent experiments have shown that by combining complex optical noise schemes and the principles of quantum mechanics, the Heisenberg sensitivity limit can be reached.
Now researchers from MoscowThe Institute of Physics and Technology, together with a colleague from the Argonne National Laboratory, developed and constructed an optical circuit that starts the phase estimation procedure based on the Fourier transform.
For this, the team placeda large number of optical elements (beam splitters, phase shifters and mirrors), and then, receiving information about the geometric angles, positions, velocities and other parameters of physical objects, using coding determined the values of interest in the optical phases.
Tests have shown that, despite the massoptical elements in the circuit, the experiment is controlled, and conventional linear optics tools are suitable for implementing even more complex operations.
Let's remember that recently researchers also proposed the concept of a new material that can conduct both electricity and light without dissipation and loss of energy.
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