A new method of implementing an "unbreakable" quantum cryptography system can transmit information at more than 10 times faster than previous experiments. Researchers have developed a new approach that overcomes one of the major issues in the implementation of quantum cryptography, raising the prospect of implementing an available "unbreakable" method for sending sensitive information hidden in light particles . A description of the indistinguishable photons output from the same output port of the beamsplitter. By "sowing" one laser beam to another, researchers from the University of Cambridge and the Toshiba European Research Center have demonstrated that cryptography is distributed at speeds two to six orders of magnitude faster than the earlier attempts at actual quantum cryptography The key is possible. The result is reported in Nature Photonics. Encryption is an important part of modern life, allowing sensitive information to be securely shared. In traditional cryptography, the sender and receiver of a particular message determine the password, or the key, so that only those who know the key can decrypt the message. But as computers get faster and harder, encrypted passwords are becoming more and more vulnerable. Quantum cryptography guarantees "unbreakable" security by hiding information in light particles or photons emitted by the laser. In this form of cryptography, quantum mechanics is used to generate a random key. The sender, often called Alice, sends the key with polarized photons with different polarization directions. Recipient, often referred to as Bob, uses a photon detector to measure the direction of the photons' polarization and then the detector converts the photons into bit information, where Bob assumes that the correct photon detector is used in the correct order Get the key. The advantage of quantum cryptography is that if an attacker tries to intercept messages from Alice and Bob, the password changes itself due to the nature of quantum mechanics. Quantum cryptography has given people the potential to achieve unbreakable security since it was first introduced in the 1980s. "In theory, attackers may have all the possible power under the laws of physics, but they still can not crack the password," said lead author Lucian Comandar, of the University of Cambridge Engineering and the Toshiba Cambridge Research Laboratory PhD student. However, the quantum cryptography problem arose when trying to build an available system. In reality, this is a game of come and go: creative attacks on different components of the system are continually being developed, and accordingly countermeasures against attacks are also evolving. The component most often hacked is a photon detector, which is usually the most complex component that is the most vulnerable due to its high sensitivity and complexity of design. In response to the attack detector, the researchers developed a new quantum cryptographic protocol called Quantum Key Distribution (MDI-QKD) that is not related to measurement equipment. In this method, Alice and Bob do not each have a detector, but instead send their photons to a central node called Charlie. Charlie lets photons through a beamsplitter and measures them. These results can reveal the correlation between these bits, but do not reveal their values ​​and remain confidential. In this device, even if Charlie tries to cheat, the information will remain safe. MDI-QKD has been experimentally proven, but its information transfer speed is too slow for practical use in the real world, mainly due to the difficulty of generating indifferent particles from different lasers. To make it work, the laser pulses emitted by Charlie's splitter need to be (relatively) relatively long, limiting the transmission rate to a few hundred bits per second (bps) or less. The method, developed by researchers at the University of Cambridge, overcomes this problem with a technique called pulsed laser sowing, in which one of the laser beams injects photons into the other. By reducing the amount of time jitter in the pulse, the laser pulse becomes more conspicuous to Charlie, allowing shorter pulses to be used. Pulsed laser sowing can also change the phase of a laser beam at very high rates. The result of using this technology in MDI-QKD devices will enable speeds up to 1 Mbps, representing two to six orders of magnitude improvement over the previous version. "This protocol gives us the highest possible level of security at very high clock rates," said Comandar. "It may indicate a practical way to implement quantum cryptography." C Clamp,G Clamps,Heavy Duty G Clamp,G Clamp for Duct Ningbo Gemu Ventilation Technology Compnay Limited , https://www.golmacool.com