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Public release date: 1-Dec-2011[ | E-mail |
Share ] Contact: Michael Bishop
michael.bishop@iop.org
44-117-930-1032
Institute of Physics
Scientists and engineers have proven the worth of quantum cryptography in telecommunication networks by demonstrating its long-term effectiveness in a real-time network.
Their international network, created in collaboration with ID Quantique and installed in the Geneva metropolitan area and crossing over to the site of CERN in France, ran for more than one-and-a-half years from the end of March 2009 to the beginning of January 2011.
Published today, 2 December, in the Institute of Physics and German Physical Society's New Journal of Physics, the researchers' study documents the longest ever deployment of a quantum key distribution (QKD) network and demonstrates its robustness and reliability when coupled with a real-time telecommunications network.
Cryptographythe practice of protecting information from third partieshas long been achieved by encrypting data with a set of complex mathematical algorithms; however, with the power of computers continuing to increase, it is becoming harder to make these algorithms watertight.
Physics has rather conveniently come up with a solution to this ever-growing problem through a process known as quantum key distribution (QKD). QKD is a process that enables two parties to share a secret key before using that key to protect data they want to send over a network.
The key that the two parties share is built up from a stream of photonsthe basic unit of light. In a theoretical scenario where Alice and Bob want to protect a piece of information with a quantum key, Alice would send a stream of photons to Bob with each one having a specific orientation, called polarisation: photons can 'spin' vertically, horizontally and diagonally.
Bob would then attempt to measure the photons coming in by randomly choosing which direction to measure them in. Sometimes he will choose the correct orientation, other times he won't. Alice and Bob would then share the measurements using classical communication methods, simply stating if Bob was right or wrong, but not mentioning the actual direction the photons were spinning in.
Alice can then discard all of Bob's wrong measurements and use the correct ones to encrypt their secret data. The beauty of QKD is that if a potential eavesdropper wanted to get hold of this key, they would actually destroy the photons when trying to measure them. As a result, they would need to send their own stream of photons on to Bob to cover their tracks, but this would introduce errors and be discarded during key distillation.
QKD is not a new phenomenon and has already been used for a number of applications: notably by ID Quantique to protect the votes in Geneva's elections and in other commercial installations where high security is needed.
For QKD to become more widespread in the commercial world, its reliability needed to be thoroughly tested as these networks run constantly all year round. Furthermore, the robustness of the network needed to be demonstrated as the systems are being taken out of safeguarded laboratories and placed into more demanding environments.
Co-author of the study Dr Damien Stucki said: "This experiment is a big step in the direction of a wider deployment of QKD in telecommunications networks. From a scientific point of view, the deployment of the quantum layer over a duration of 21 months with high reliability is very significant.
"The SwissQuantum network was very reliable, with the only interruptions coming from external problems, such as power cuts and air conditioning problems, not the QKD layer."
###
From, Friday 2 December, the full paper can be downloaded from http://iopscience.iop.org/1367-2630/13/12/123001/article
Notes to Editors
Contact
1. For further information, a full draft of the journal paper or contact with one of the researchers, contact IOP Publishing Press Assistant, Michael Bishop:
Tel: 0117 930 1032
E-mail: Michael.Bishop@iop.org
Long-term performance of the SwissQuantum quantum key distribution network in a field environment
2. The published version of the paper "Long-term performance of the SwissQuantum quantum key distribution network in a field environment" Stucki et al 2011 New J. Phys. 13 123001 will be freely available online from Friday 2 December. It will be available at http://iopscience.iop.org/1367-2630/13/12/123001/article
New Journal of Physics
3. New Journal of Physics publishes across the whole of physics, encompassing pure, applied, theoretical and experimental research, as well as interdisciplinary topics where physics forms the central theme. All content is permanently free to read and the journal is funded by an article publication charge.
IOP Publishing
4. IOP Publishing provides publications through which leading-edge scientific research is distributed worldwide. IOP Publishing is central to the Institute of Physics (IOP), a not-for-profit society. Any financial surplus earned by IOP Publishing goes to support science through the activities of IOP. Beyond our traditional journals programme, we make high-value scientific information easily accessible through an ever-evolving portfolio of community websites, magazines, conference proceedings and a multitude of electronic services. Focused on making the most of new technologies, we're continually improving our electronic interfaces to make it easier for researchers to find exactly what they need, when they need it, in the format that suits them best. Go to http://ioppublishing.org/
The Institute of Physics
5. The Institute of Physics is a leading scientific society promoting physics and bringing physicists together for the benefit of all.
It has a worldwide membership of around 40 000 comprising physicists from all sectors, as well as those with an interest in physics. It works to advance physics research, application and education; and engages with policy makers and the public to develop awareness and understanding of physics. Its publishing company, IOP Publishing, is a world leader in professional scientific communications. Go to www.iop.org
The German Physical Society
6. The German Physical Society (DPG) with a tradition extending back to 1845 is the largest physical society in the world with more than 59,000 members. The DPG sees itself as the forum and mouthpiece for physics and is a non-profit organisation that does not pursue financial interests. It supports the sharing of ideas and thoughts within the scientific community, fosters physics teaching and would also like to open a window to physics for all those with a healthy curiosity.
[ | E-mail | Share ] ?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
Public release date: 1-Dec-2011[ | E-mail |
Share ] Contact: Michael Bishop
michael.bishop@iop.org
44-117-930-1032
Institute of Physics
Scientists and engineers have proven the worth of quantum cryptography in telecommunication networks by demonstrating its long-term effectiveness in a real-time network.
Their international network, created in collaboration with ID Quantique and installed in the Geneva metropolitan area and crossing over to the site of CERN in France, ran for more than one-and-a-half years from the end of March 2009 to the beginning of January 2011.
Published today, 2 December, in the Institute of Physics and German Physical Society's New Journal of Physics, the researchers' study documents the longest ever deployment of a quantum key distribution (QKD) network and demonstrates its robustness and reliability when coupled with a real-time telecommunications network.
Cryptographythe practice of protecting information from third partieshas long been achieved by encrypting data with a set of complex mathematical algorithms; however, with the power of computers continuing to increase, it is becoming harder to make these algorithms watertight.
Physics has rather conveniently come up with a solution to this ever-growing problem through a process known as quantum key distribution (QKD). QKD is a process that enables two parties to share a secret key before using that key to protect data they want to send over a network.
The key that the two parties share is built up from a stream of photonsthe basic unit of light. In a theoretical scenario where Alice and Bob want to protect a piece of information with a quantum key, Alice would send a stream of photons to Bob with each one having a specific orientation, called polarisation: photons can 'spin' vertically, horizontally and diagonally.
Bob would then attempt to measure the photons coming in by randomly choosing which direction to measure them in. Sometimes he will choose the correct orientation, other times he won't. Alice and Bob would then share the measurements using classical communication methods, simply stating if Bob was right or wrong, but not mentioning the actual direction the photons were spinning in.
Alice can then discard all of Bob's wrong measurements and use the correct ones to encrypt their secret data. The beauty of QKD is that if a potential eavesdropper wanted to get hold of this key, they would actually destroy the photons when trying to measure them. As a result, they would need to send their own stream of photons on to Bob to cover their tracks, but this would introduce errors and be discarded during key distillation.
QKD is not a new phenomenon and has already been used for a number of applications: notably by ID Quantique to protect the votes in Geneva's elections and in other commercial installations where high security is needed.
For QKD to become more widespread in the commercial world, its reliability needed to be thoroughly tested as these networks run constantly all year round. Furthermore, the robustness of the network needed to be demonstrated as the systems are being taken out of safeguarded laboratories and placed into more demanding environments.
Co-author of the study Dr Damien Stucki said: "This experiment is a big step in the direction of a wider deployment of QKD in telecommunications networks. From a scientific point of view, the deployment of the quantum layer over a duration of 21 months with high reliability is very significant.
"The SwissQuantum network was very reliable, with the only interruptions coming from external problems, such as power cuts and air conditioning problems, not the QKD layer."
###
From, Friday 2 December, the full paper can be downloaded from http://iopscience.iop.org/1367-2630/13/12/123001/article
Notes to Editors
Contact
1. For further information, a full draft of the journal paper or contact with one of the researchers, contact IOP Publishing Press Assistant, Michael Bishop:
Tel: 0117 930 1032
E-mail: Michael.Bishop@iop.org
Long-term performance of the SwissQuantum quantum key distribution network in a field environment
2. The published version of the paper "Long-term performance of the SwissQuantum quantum key distribution network in a field environment" Stucki et al 2011 New J. Phys. 13 123001 will be freely available online from Friday 2 December. It will be available at http://iopscience.iop.org/1367-2630/13/12/123001/article
New Journal of Physics
3. New Journal of Physics publishes across the whole of physics, encompassing pure, applied, theoretical and experimental research, as well as interdisciplinary topics where physics forms the central theme. All content is permanently free to read and the journal is funded by an article publication charge.
IOP Publishing
4. IOP Publishing provides publications through which leading-edge scientific research is distributed worldwide. IOP Publishing is central to the Institute of Physics (IOP), a not-for-profit society. Any financial surplus earned by IOP Publishing goes to support science through the activities of IOP. Beyond our traditional journals programme, we make high-value scientific information easily accessible through an ever-evolving portfolio of community websites, magazines, conference proceedings and a multitude of electronic services. Focused on making the most of new technologies, we're continually improving our electronic interfaces to make it easier for researchers to find exactly what they need, when they need it, in the format that suits them best. Go to http://ioppublishing.org/
The Institute of Physics
5. The Institute of Physics is a leading scientific society promoting physics and bringing physicists together for the benefit of all.
It has a worldwide membership of around 40 000 comprising physicists from all sectors, as well as those with an interest in physics. It works to advance physics research, application and education; and engages with policy makers and the public to develop awareness and understanding of physics. Its publishing company, IOP Publishing, is a world leader in professional scientific communications. Go to www.iop.org
The German Physical Society
6. The German Physical Society (DPG) with a tradition extending back to 1845 is the largest physical society in the world with more than 59,000 members. The DPG sees itself as the forum and mouthpiece for physics and is a non-profit organisation that does not pursue financial interests. It supports the sharing of ideas and thoughts within the scientific community, fosters physics teaching and would also like to open a window to physics for all those with a healthy curiosity.
[ | E-mail | Share ] ?
AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.
Source: http://www.eurekalert.org/pub_releases/2011-12/iop-ssp120111.php
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