Home / Software & Service News / Physicists create a ‘quantum ruler’ to measure the universe

Physicists create a ‘quantum ruler’ to measure the universe

A group of physicists from the Russian Quantum Center and the Moscow Institute of Physics and Technology have come up with a new method of creating a special entangled quantum state, one that could be used as “a high-precision ruler” for measuring large distances with subatomic precision. The technique, described in a new study in the journal Nature Communications, could be used to increase the sensitivity of optical interferometers like the ones used by the LIGO project to detect gravitational waves.

Simply put, LIGO works by splitting a single laser into two beams, which are then recombined. If one of the beams experiences interference like a gravitational wave, it shifts the wavelength and creates a measurable difference between the two beams called an interference pattern. LIGO can currently measure differences “comparable to the diameter of a proton,” the study’s authors wrote in a press release. This new “quantum ruler,” on the other hand, utilizes NOON states of photons, where a multiphoton laser pulse is at two points at the same time. In the experiment, the photons at each point, referred to as “Alice” and “Bob”, are each in an entangled state. When one of their entangled parts experiences interference (in this case, the laser was shot through a piece of darkened glass), it creates a measurable difference from the original NOON state in a phenomenon known as entanglement swapping. That difference can be measured in sizes even smaller than a proton.

While the study conducted this research in a lab, according to lead author and RQC research Alexander Ulanov, the same method could also be used in terrestrial interferometers like LIGO or its space-borne sister instrument LISA.

Click Here For Original Source Of The Article

About Ms. A. C. Kennedy

Ms. A. C. Kennedy
My name is Ms A C Kennedy and I am a Health practitioner and Consultant by day and a serial blogger by night. I luv family, life and learning new things. I especially luv learning how to improve my business. I also luv helping and sharing my information with others. Don't forget to ask me anything!

Check Also

Microsoft’s Seeing AI app for the blind now reads handwriting

Artificial intelligence took center stage at Microsoft's AI Summit in San Francisco on Wednesday. Aside from announcing AI smarts for a range of software -- from Bing to Office 365 -- the tech titan is also ramping up its Seeing AI app for iOS, which uses computer vision to audibly help blind and visually impaired people to see the world around them. According to Microsoft, it's nabbed 100,000 downloads since its launch in the US earlier this year, which convinced the tech titan to bring it to 35 countries in total, including the EU.

It's also getting a bunch of new features. The app now boasts more currency recognition, adding British pounds, US dollars, Canadian dollars, and Euros to its tally. Going beyond the color in a scene, it can also spot the color of specific objects, like clothes. Plus, it's no longer restricted to just short printed text, with handwriting recognition now part of its skill set. You can also customize the voice that it uses to speak its observations out loud, and set how fast it talks.

Finally, a musical light detector alerts you to the light in an environment with an audible tone -- Microsoft claims the tool will save users from having to touch a hot bulb or LED battery to check if it's on. Despite the big update, there's still no word on an Android launch.

Source: Microsoft

css.php