Navigation Links
Quantum physics: New insights into the remote control of quantum systems
Date:8/6/2012

A fundamental characteristic of quantum physics is the fact that two or more particles can exhibit correlations stronger than classically allowed. This unique characteristic applies particularly to quantum entanglement: as soon as the quantum state of a particle is measured the state of its entangled partner changes accordingly, regardless of how far apart the two entangled particles might be. This feature allows for the remote quantum state preparation, which is an essential ingredient for applications in quantum communication, quantum cryptography, and quantum computation.

The degree of entanglement is often used as a figure of merit for determining its usefulness for quantum technologies. Strongly entangled systems, however, are very sensitive to extrinsic influence and difficult to prepare and to control. A team of researchers headed by the physicists Caslav Brukner (theory) and Philip Walther (experiment) at the University of Vienna have been able to show that in order to achieve successful remote state preparation entanglement is not the only way forward. Under certain circumstances, non-entangled states can outperform their entangled counterparts for such tasks - as long as they have a significant amount of so-called "quantum discord". This novel and not yet fully understood measure of quantum correlations quantifies the disturbance of correlated particles when being measured.

In their experiments, the researchers used a variety of two-photon states with different polarization correlations. "By measuring the polarization state of a certain photon we prepare the state of the respective partner photon remotely", explains Philip Walther. "In the experiment we observe how the quality of our remotely prepared quantum state is affected by changes in the quantum discord." This work provides an important and significant step towards future quantum information processing schemes that would rely on less demanding resources.


'/>"/>
Contact: Philip Walther
philip.walther@univie.ac.at
43-664-602-777-2560
University of Vienna
Source:Eurekalert  

Page: 1

Related biology technology :

1. UK research paves way to a scalable device for quantum information processing
2. Researchers tune the strain in graphene drumheads to create quantum dots
3. Quantum bar magnets in a transparent salt
4. Metamaterials, quantum dots show promise for new technologies
5. En route to a quantum computer
6. Quantum dots brighten the future of lighting
7. Raising the prospects for quantum levitation
8. Quantum computer built inside a diamond
9. Quantum control protocols could lead to more accurate, larger scale quantum computations
10. Single molecules in a quantum movie
11. A new class of electron interactions in quantum systems
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Quantum physics: New insights into the remote control of quantum systems
(Date:5/3/2016)... , May 3, 2016  Dr. Thomas ... surgeon in The Woodlands, Texas , ... 24 percent of treated fat cells in just 25-minutes, ... Close to 90 percent of Americans report feeling bothered ... Nonsurgical fat reduction procedures are a growing industry. This ...
(Date:5/2/2016)... , May 2, 2016 ... that its technology partner Mannin Research Inc. will be ... (ARVO), which takes place from May 1-5, 2016 in ... will be meeting with its vendors and research partners. ... business development goals and other collaborative opportunities for the ...
(Date:5/2/2016)... PHILADELPHIA, PA (PRWEB) , ... May 02, 2016 ... ... is proud to report on the pre-launch success of their revolutionary, veterinarian-designed product ... allowing cats to stalk, trap, and play with their food the way nature ...
(Date:4/29/2016)... ... April 29, 2016 , ... Amendia, Inc., a leading designer, ... announced the completion of a significant transaction and partnership that positions Amendia for ... partners. Kohlberg & Company, L.L.C. (“Kohlberg”), a leading private equity firm specializing ...
Breaking Biology Technology:
(Date:4/26/2016)... April 27, 2016 Research ... Multi-modal Biometrics Market 2016-2020"  report to their offering.  ... The analysts forecast the global multimodal ... 15.49% during the period 2016-2020.  Multimodal ... sectors such as the healthcare, BFSI, transportation, automotive, ...
(Date:4/15/2016)... DUBLIN , April 15, 2016 ... of the,  "Global Gait Biometrics Market 2016-2020,"  report ... http://photos.prnewswire.com/prnh/20160330/349511LOGO ) , ,The global gait ... CAGR of 13.98% during the period 2016-2020. ... movement angles, which can be used to compute ...
(Date:3/31/2016)... Florida , March 31, 2016 ... ) ("LegacyXChange" or the "Company") LegacyXChange ... potential users of its soon to be launched online ... ( https://www.youtube.com/channel/UCyTLBzmZogV1y2D6bDkBX5g ) will also provide potential ... use of DNA technology to an industry that is ...
Breaking Biology News(10 mins):