Quantcast

Latest Quantum cryptography Stories

c3e90c6ce4d5a3c8d028946260bfb971
2011-08-11 05:45:00

Physicists at the National Institute of Standards and Technology (NIST) have discovered that the quantum properties of ions can be manipulated using microwaves, instead of lasers. Using microwaves enables the experiments to be made with a system that is one-tenth the size of conventional laser based systems. Compared to the laser sources, microwave components could be expanded to build practical quantum computing systems using thousands of ions for quantum computing and simulations....

2011-08-02 16:37:52

Dr Xiao-Qi Zhou and colleagues at the University of Bristol's Centre for Quantum Photonics and the University of Queensland, Australia, have shown that controlled operations "” ones that are implemented on the condition that a "control bit" is in the state 1 "” can be dramatically simplified compared to the standard approach. The researchers believe their technique will find applications across quantum information technologies, including precision measurement, simulation of...

2011-08-01 12:07:38

The quantum world allows you to answer questions correctly when you don't even have all the information you should need No-one likes a know-it-all but we expect to be able to catch them out: someone who acts like they know everything but doesn't can always be tripped up with a well-chosen question. Can't they? Not so. New research in quantum physics has shown that a quantum know-it-all could lack information about a subject as a whole, yet answer almost perfectly any question about the...

2011-07-07 19:14:55

Researchers at the National Institute of Standards and Technology (NIST) have created a tunable superconducting circuit on a chip that can place a single microwave photon (particle of light) in two frequencies, or colors, at the same time. This curious "superposition," a hallmark of the quantum world, is a chip-scale, microwave version of a common optics experiment in which a device called a beam-splitter sends a photon into either of two possible paths across a table of lasers, lenses and...

4af1e19cf33e8522c14616b8a54d1831
2011-06-15 11:51:11

Researchers in Singapore and Norway implement a perfect eavesdropper that illustrates an overlooked loophole in secure communications technology Singapore and Trondheim, Norway: Quantum key distribution (QKD) is an advanced tool for secure computer-based interactions, providing confidential communication between two remote parties by enabling them to construct a shared secret key during the course of their conversation. QKD is perfectly secure in principle, but researchers have long been...

2011-03-17 12:02:59

A team of physicists in the United Kingdom has taken a giant step toward realizing efficient single-photon sources, which are expected to enable much-coveted completely secure optical communications, also known as "quantum cryptography." The team presents its findings in Applied Physics Letters, a journal published by the American Institute of Physics. Fluorescent "defect centers" in diamond act like atomic-scale light sources and are trapped in a transparent material that's large enough to...

2011-03-10 18:27:56

New switching device could help build a dream: the ultrafast quantum Internet Northwestern University researchers have developed a new switching device that takes quantum communication to a new level. The device is a practical step toward creating a network that takes advantage of the mysterious and powerful world of quantum mechanics. The researchers can route quantum bits, or entangled particles of light, at very high speeds along a shared network of fiber-optic cable without losing the...

8c2c49fe54f3972533ca2c18eb391f141
2011-03-02 09:25:19

A research group led by scientists from the University of Bristol has demonstrated the quantum operation of new components that will enable compact circuits for future photonic quantum computers. Quantum computers, holding the great promise of tremendous computational power for particular tasks, have been the goal of worldwide efforts by scientists for several years. Tremendous advances have been made but there is still a long way to go. Building a quantum computer will require a large number...

e33edea2537af9df7cae578faee773121
2011-02-24 09:50:55

Atomic antennae transmit quantum information across a microchip The Austrian research group led by physicist Rainer Blatt suggests a fundamentally novel architecture for quantum computation. They have experimentally demonstrated quantum antennae, which enable the exchange of quantum information between two separate memory cells located on a computer chip. This offers new opportunities to build practical quantum computers. The researchers have published their work in the scientific journal...

35c976ebe589cc64e03a87bc75a9c3011
2011-01-19 15:20:05

Scientists have moved a step closer to creating quantum computers by generating 10 billion bits of quantum entanglement in silicon for the first time. According to a team from Britain, Japan, Canada and Germany, whose study was published in the journal Nature on Wednesday, the achievement in silicon has important implications for integration with existing technology. "Creating 10 billion entangled pairs in silicon with high fidelity is an important step forward for us," John Morton of...


Word of the Day
negawatt
  • A unit of saved energy.
Coined by Amory Lovins, chairman of the Rocky Mountain Institute as a contraction of negative watt on the model of similar compounds like megawatt.