Post by Διαμονδ on Nov 1, 2017 13:20:10 GMT
Physicists from Russia found out how to accelerate the "quantum Internet"
Physicists from the Russian quantum center, Steklov Mathematical Institute and National University of Singapore have created a new method of signal coding in quantum communication networks, which allows to reduce the amount of noise and error in signal transmission speed and quantum networks. Instructions for its implementation was published in the journal Physical Review Applied.
"We have created a more "symmetrical" method of error correction in which both parties, Alice and Bob, sending a correcting bit sequence to each other. In previous versions of the algorithms, all the information was strictly from Alice to Bob. Due to this symmetry we could reduce the amount of advertised information by 10% and third to reduce the number of rounds required for key exchange", — says Eugene Kiktenko,the author of the error correction Protocol.
The phenomenon of quantum entanglement is the basis of modern quantum technologies. This phenomenon, in particular, plays an important role in the systems of secure quantum communication – this system completely exclude the possibility of invisible "wiretapping" due to the fact that the laws of quantum mechanics prohibit "cloning" the state of the light particles. In the present system of quantum communication are being actively developed in Europe, in China, in the United States.
The first network of this kind began to appear in Russia about three years ago. The first quantum communication line was launched at the ITMO University in 2014, when scientists associated quantum channel of two buildings of the University, via the existing underground fiber optic cable. In June 2016, the Russian quantum center announced the launch of the first "urban" lines of communication between the two branches of the Bank, and in September 2016, MSU announced the connection of two points in the cities suburbs.
The main issue in such systems, communication, how to tell Kiktenko and his colleagues, is that correct transmission of quantum keys is hindered by various noise and interference encountered in the transmission of signals over long distances and without the participation of the attackers. This greatly reduces the communication speed and forces scientists to make tweaks to correct some of these errors, without violating the secrecy of the transmitted information.
To correct such errors, as the researchers note, the need for conventional communication channel, which remains vulnerable to eavesdropping. For this reason, the founders of quantum networks using such algorithms is error correction, which transmit only a minimal amount of data needed for key recovery for which it will be impossible to calculate.
For example, a quantum network today find and correct the errors in the following way: they break the key on the small blocks, put the bits in these blocks among themselves, and determine whether this sum is odd or even. If these indicators do not match, then information about that allows you to find and correct the error just as is done in the memory chip industrial computers.
This technique, the so-called "cascade Protocol," how to explain physics from the RCC, works well enough, but it has one big drawback – it is recursive in nature, and to correct one error we need to conduct many rounds of communication between the transmitter and the receiver key, which significantly reduces the network speed.
Kiktenko and his colleagues created an alternative method of error correction that runs much faster using a different method parity. In the framework of the quantum key sender sends to the recipient the data at the parity of each block, and partial information about the key that allows the recipient to verify its integrity and, with some luck, fix the errors.
Russian scientists were able to speed up its work by creating a Protocol that allows the transfer of such parts of the key, so-called syndromes, not only from the sender to the addressee, but in the opposite direction. This approach allows not only to accelerate the search for errors by 30%, but also reduce the amount of data transferred, giving less chance to the attacker to hack your network.
As the press service of the RCC, scientists have tested the potential of the new method on a real quantum network created earlier in Moscow, and was convinced in its efficiency.
ria.ru/science/20171101/1507988435.html
Physicists from the Russian quantum center, Steklov Mathematical Institute and National University of Singapore have created a new method of signal coding in quantum communication networks, which allows to reduce the amount of noise and error in signal transmission speed and quantum networks. Instructions for its implementation was published in the journal Physical Review Applied.
"We have created a more "symmetrical" method of error correction in which both parties, Alice and Bob, sending a correcting bit sequence to each other. In previous versions of the algorithms, all the information was strictly from Alice to Bob. Due to this symmetry we could reduce the amount of advertised information by 10% and third to reduce the number of rounds required for key exchange", — says Eugene Kiktenko,the author of the error correction Protocol.
The phenomenon of quantum entanglement is the basis of modern quantum technologies. This phenomenon, in particular, plays an important role in the systems of secure quantum communication – this system completely exclude the possibility of invisible "wiretapping" due to the fact that the laws of quantum mechanics prohibit "cloning" the state of the light particles. In the present system of quantum communication are being actively developed in Europe, in China, in the United States.
The first network of this kind began to appear in Russia about three years ago. The first quantum communication line was launched at the ITMO University in 2014, when scientists associated quantum channel of two buildings of the University, via the existing underground fiber optic cable. In June 2016, the Russian quantum center announced the launch of the first "urban" lines of communication between the two branches of the Bank, and in September 2016, MSU announced the connection of two points in the cities suburbs.
The main issue in such systems, communication, how to tell Kiktenko and his colleagues, is that correct transmission of quantum keys is hindered by various noise and interference encountered in the transmission of signals over long distances and without the participation of the attackers. This greatly reduces the communication speed and forces scientists to make tweaks to correct some of these errors, without violating the secrecy of the transmitted information.
To correct such errors, as the researchers note, the need for conventional communication channel, which remains vulnerable to eavesdropping. For this reason, the founders of quantum networks using such algorithms is error correction, which transmit only a minimal amount of data needed for key recovery for which it will be impossible to calculate.
For example, a quantum network today find and correct the errors in the following way: they break the key on the small blocks, put the bits in these blocks among themselves, and determine whether this sum is odd or even. If these indicators do not match, then information about that allows you to find and correct the error just as is done in the memory chip industrial computers.
This technique, the so-called "cascade Protocol," how to explain physics from the RCC, works well enough, but it has one big drawback – it is recursive in nature, and to correct one error we need to conduct many rounds of communication between the transmitter and the receiver key, which significantly reduces the network speed.
Kiktenko and his colleagues created an alternative method of error correction that runs much faster using a different method parity. In the framework of the quantum key sender sends to the recipient the data at the parity of each block, and partial information about the key that allows the recipient to verify its integrity and, with some luck, fix the errors.
Russian scientists were able to speed up its work by creating a Protocol that allows the transfer of such parts of the key, so-called syndromes, not only from the sender to the addressee, but in the opposite direction. This approach allows not only to accelerate the search for errors by 30%, but also reduce the amount of data transferred, giving less chance to the attacker to hack your network.
As the press service of the RCC, scientists have tested the potential of the new method on a real quantum network created earlier in Moscow, and was convinced in its efficiency.
ria.ru/science/20171101/1507988435.html
