Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

INRS takes giant step forward in generating optical qubits

11.03.2016

The optical chip developed at INRS by Prof. Roberto Morandotti's team overcomes a number of obstacles in the development of quantum computers, which are expected to revolutionize information processing. The international research team has demonstrated that on-chip quantum frequency combs can be used to simultaneously generate multiphoton entangled quantum bit (qubit) states.

Quantum computing differs fundamentally from classical computing, in that it is based on the generation and processing of qubits. Unlike classical bits, which can have a state of either 1 or 0, qubits allow a superposition of the 1 and 0 states (both simultaneously).


The optical chip developed at INRS by Prof. Roberto Morandotti's team overcomes a number of obstacles in the development of quantum computers. This team has demonstrated that on-chip quantum frequency combs can be used to simultaneously generate multiphoton entangled quantum bit states. It is the first chip capable of simultaneously generating multi-photon qubit states and two-photon entangled states on hundreds of frequency modes. The chip is scalable, compact, and compatible with existing technologies.

Credit: Ultrafast Optical Processing Group, 2016.

Strikingly, multiple qubits can be linked in so-called 'entangled' states, where the manipulation of a single qubit changes the entire system, even if individual qubits are physically distant. This property is the basis for quantum information processing, aiming towards building superfast quantum computers and transferring information in a completely secure way.

Professor Morandotti has focused his research efforts on the realization of quantum components compatible with established technologies. The chip developed by his team was designed to meet numerous criteria for its direct use: it is compact, inexpensive to make, compatible with electronic circuits, and uses standard telecommunication frequencies. It is also scalable, an essential characteristic if it is to serve as a basis for practical systems. But the biggest technological challenge is the generation of multiple, stable, and controllable entangled qubit states.

The generation of qubits can rely on several different approaches, including electron spins, atomic energy levels, and photon quantum states. Photons have the advantage of preserving entanglement over long distances and time periods. But generating entangled photon states in a compact and scalable way is difficult. "What is most important, several such states have to be generated simultaneously if we are to arrive at practical applications," added INRS research associate Dr. Michael Kues.

Roberto Morandotti's team tackled this challenge by using on-chip optical frequency combs for the first time to generate multiple entangled qubit states of light. As Michael Kues explains, optical frequency combs are light sources comprised of many equally-spaced frequency modes. "Frequency combs are extraordinarily precise sources and have already revolutionized metrology and sensing, as well as earning their discoverers the 2005 Nobel Prize in Physics."

Thanks to these integrated quantum frequency combs, the chip developed by INRS is able to generate entangled multi-photon qubit states over several hundred frequency modes. It is the first time anyone has demonstrated the simultaneous generation of qubit multi-photon and two-photon entangled states: Until now, integrated systems developed by other research teams had only succeeded in generating individual two-photon entangled states on a chip.

The results published in Science will provide a foundation for new research, both in integrated quantum photonics and quantum frequency combs. This could revolutionize optical quantum technologies, while at the same time maintaining compatibility with existing semiconductor chip technology.

###

About the publication

This highly promising breakthrough is described in an article in the prestigious journal Science entitled "Generation of multiphoton entangled quantum states by means of integrated frequency combs" (DOI : 10.1126/science.aad8532). The team that wrote the article is made up of Christian Reimer, Michael Kues, Piotr Roztocki, Benjamin Wetzel, Fabio Grazioso, Brent E. Little, Sai T. Chu, Tudor Johnston, Yaron Bromberg, Lucia Caspani, David J. Moss, and Roberto Morandotti. The research was made possible with the financial support of the Natural Sciences and Engineering Research Council of Canada (NSERC), the Australian Research Council, Fonds de Recherche du Québec - Nature et Technologies (FRQNT), the European Union through the 7th Framework Program and Horizon 2020, Mitacs, and the City University of Hong Kong.

About INRS

Institut national de recherche scientifique (INRS) is a graduate-level research and training university and ranks first in Canada for research intensity (average grant funding per faculty member). INRS brings together some 150 professors and close to 700 students and postdoctoral fellows at its four centres in Montreal, Quebec City, Laval, and Varennes. Its basic research is essential to the advancement of science in Quebec and internationally even as it plays a key role in the development of concrete solutions to the problems faced by our society.

Media Contact

Stephanie Thibault
stephanie.thibault@inrs.ca
514-499-6612

 @U_INRS

http://www.inrs.ca/ 

Stephanie Thibault | EurekAlert!

More articles from Physics and Astronomy:

nachricht Observations of nearby supernova and associated jet cocoon provide new insights on gamma-ray bursts
18.01.2019 | George Washington University

nachricht A new twist on a mesmerizing story
17.01.2019 | ETH Zurich Department of Physics

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Ten-year anniversary of the Neumayer Station III

The scientific and political community alike stress the importance of German Antarctic research

Joint Press Release from the BMBF and AWI

The Antarctic is a frigid continent south of the Antarctic Circle, where researchers are the only inhabitants. Despite the hostile conditions, here the Alfred...

Im Focus: Ultra ultrasound to transform new tech

World first experiments on sensor that may revolutionise everything from medical devices to unmanned vehicles

The new sensor - capable of detecting vibrations of living cells - may revolutionise everything from medical devices to unmanned vehicles.

Im Focus: Flying Optical Cats for Quantum Communication

Dead and alive at the same time? Researchers at the Max Planck Institute of Quantum Optics have implemented Erwin Schrödinger’s paradoxical gedanken experiment employing an entangled atom-light state.

In 1935 Erwin Schrödinger formulated a thought experiment designed to capture the paradoxical nature of quantum physics. The crucial element of this gedanken...

Im Focus: Nanocellulose for novel implants: Ears from the 3D-printer

Cellulose obtained from wood has amazing material properties. Empa researchers are now equipping the biodegradable material with additional functionalities to produce implants for cartilage diseases using 3D printing.

It all starts with an ear. Empa researcher Michael Hausmann removes the object shaped like a human ear from the 3D printer and explains:

Im Focus: Elucidating the Atomic Mechanism of Superlubricity

The phenomenon of so-called superlubricity is known, but so far the explanation at the atomic level has been missing: for example, how does extremely low friction occur in bearings? Researchers from the Fraunhofer Institutes IWM and IWS jointly deciphered a universal mechanism of superlubricity for certain diamond-like carbon layers in combination with organic lubricants. Based on this knowledge, it is now possible to formulate design rules for supra lubricating layer-lubricant combinations. The results are presented in an article in Nature Communications, volume 10.

One of the most important prerequisites for sustainable and environmentally friendly mobility is minimizing friction. Research and industry have been dedicated...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Our digital society in 2040

16.01.2019 | Event News

11th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Aachen, 3-4 April 2019

14.01.2019 | Event News

ICTM Conference 2019: Digitization emerges as an engineering trend for turbomachinery construction

12.12.2018 | Event News

 
Latest News

Additive manufacturing reflects fundamental metallurgical principles to create materials

18.01.2019 | Materials Sciences

How molecules teeter in a laser field

18.01.2019 | Life Sciences

The cytoskeleton of neurons has been found to be involved in Alzheimer's disease

18.01.2019 | Health and Medicine

VideoLinks
Science & Research
Overview of more VideoLinks >>>