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A low-fiber low loss system for strong and efficient coupling between distant atoms



A low-fiber low loss system for strong and efficient coupling between distant atoms

Experimental device for all-QED-fiber cavity system. Credit: Aoki Laboratory, Waseda University

A team of scientists from the Waseda University, Japan's Science and Technology Agency, and Auckland University have developed a compass quantum integration (QED) system of whole fiber cavities, which includes a lot of conventional optical fiber continuously and connect The two cohesive nanofiber-QED systems.


This type of system can enable quantum calculation, free from the limited computational power that systems are tested today, and quantum networks that transfer and process computer generated quantum information quantum, ”said Takao Aoki, professor of applied physics at Waseda University and research team leader. "In the future, quantum information science technology of such kind can help provide developments that could significantly change our society, such as discoveries of new materials and pharmaceutical drugs."

The team's study was published in Merthyr Tydfil Nature Communications on March 11, 2019.

The QED cavity system is a system in which photons – elementary light – and atoms are restricted within an optical resonator and interact with each other in a quantum-mechanical manner. This system has been a prototype experimental platform to help scientists better understand and treat the quantum properties of photons and atoms, as highlighted by the 2012 Nobel Prize award for physicist Serge Haroche for his / her; innovative experimental methods that enable measurement and treatment of individual quantum systems. # 39; As a result, the expectation of QED-cavity systems to realize quantum information science technology has increased.

In order to realize such technology, QED multi-cavity systems needed to be integrated with a coherent, reversible rotation between all systems, but ensuring coupling of such a high enough efficiency has made this very challenging. Aoki and his team went to the grip with this problem by showing a system that included two cavity-QED nanofiber systems which were connected to each other in a way. whole fiber.

"In each cavity, there is an ensemble of several tens of atoms interacting with the cavity field through the field of evanescent nanofiber, both of which are connected to standard optical fibers through broken regions. and share them with a pair of fiber-Bragg grating mirrors, "Aoki explains. "Multiple resoners can be connected with minimal losses using additional standard optical fiber, making the coherent, combined dynamics in both QED nanofiber cavity systems possible."

This allowed the team to observe reversible interactions between displaced atoms and photons, separated by unprecedented distances of up to two meters, first in any quantum optical system of such type.

Aoki says, "Our achievement is an important step towards the implementation of distributed quantum computation based on QED based on physical and quantum network, where a large number of QED cavity systems have been linked to. T cohesive with low-loss fiber channels, attachment over the entire network can be determined, rather than likely.

Their system also prepares the way to study the physics of many bodies – the collective behavior of particle interactions in large numbers – with atoms and photons in a network of QED cavity systems, including phenomena such as light quantum phase transitions.

The team is now making technical improvements to the setup to extend their work to build a fiber network from QED cavity atoms systems to their coordinated co-ordination. This includes reducing uncontrolled losses in the cavities, stabilizing the frequency of resonance actively, and extending the life of the atoms in the traps that hold them near the nanoparticles.


Organic molecule turns into a two-level coherent system quantum


More information:
Shinya Kato et al, Observing conditions worn from remote atoms with photons have been displaced in a couple quantum electrodynamics to tie, Nature Communications (2019). DOI: 10.1038 / s41467-019-08975-8

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Waseda University

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Low-fiber low loss system for strong and efficient coupling between remote atoms (2019, April 1)
retrieved 1 April 2019
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