Time travel, such as, say, through a “wormhole,” appears to make it possible to distinguish quantum information that usually can’t be distinguished. That ability would disrupt the absolute security of quantum encryption, theoretical physicist Todd Brun and collaborators report online in the quantum physics archive.

The US Army Research Office and the National Security Agency (NSA) are together looking for some answers to their quantum physics questions on quantum computing and cryptography.

Perfect secrecy has come a step closer with the launch of the world's first computer network protected by unbreakable quantum encryption at a scientific conference in Vienna.

A group of international researchers and Siemens Austria has demonstrated in Vienna the transmission of quantum-encrypted messages across commercial telecommunication links. The achievement could bring quantum encryption close to commercial deployment.

University of Vienna researchers hope to send an experiment to the International Space Station (ISS) by the middle of the next decade that would pave the way for transcontinental transmission of secret messages encoded using quantum entanglement.

Stephen Page argues that given the capability of quantum computers to invalidate cryptography techniques, society should "create safeguards, standards and laws to prevent people from using quantum computers to wreak destruction."

Code-makers could be on the verge of winning their ancient arms race with code-breakers. After 20 years of research, an encryption process is emerging that is considered unbreakable because it employs the mind-blowing laws of quantum physics.

British researchers say they are close to producing an off-the-shelf system that exploits quantum physics to create a secure communications channel.

Walter Simmons, a physicist at the University of Hawaii, together with his colleague, Professor Sandip Pakvasa, have come up with a clever scheme that would allow interstellar broadcasters to keep the coordinates of their home planet secret by taking advantage of advances in quantum cryptography.

Quantum encryption is about to make life much more difficult for Internet spies. Not only will it make data uncrackable, the new technology also speeds up the increasingly slow process of sending coded messages over the Internet.