For more specific information, see:

QBITS Simulations for Development of Quantum Computer using the DSP 6711
Technical Proceedings of the 2007 NSTI Nanotechnology Conference and Trade Show, Volume 1

Scientific American, October 2005 - Quantum Bug

Scientific American, April 2005 - Qubit Twist

Scientific American, January 2005 - Best Kept Secrets

Scientific American, March 2003 - Quantum Teleportation

As reported in

April 7, 2003

Developments to Watch
Edited by Adam Aston

Connections That Leave Broadband in the Dust

NOTE:  While this new technological discovery reported below (FAST) doesn't relate directly to the concept of qubits, it is a development that will most assuredly contribute to the further development of the qubits concept. Read on and consider the possibilities.

By changing the rules, or "protocols," that govern data transmission over the Internet, scientists have more than tripled the highest speed at which large blocks of information can be transported. In a recent test, the new protocol sustained transfer rates of 8,609 megabits per second of uncompressed data -- about 6,000 times faster than a typical home broadband link.

Researchers who created the protocol at California Institute of Technology have dubbed it FAST transmission control protocol. (FAST is an acronym, but you don't want to know.) It uses complex algorithms to make more efficient use of existing bandwidth. Over a given Internet link, the current protocol tops out at 25% of maximum throughput. FAST is 95% efficient, says Steven Low, a computer scientist who leads the Caltech project. And it offers the same boost over any connection, be it a home DSL line or a T3 at the office.

FAST is being developed to help distribute scientific data and enhance "GRID" computing, in which big problems are parceled out to many computers running concurrently. The protocol is now being tested at several high-energy physics labs. These are home to the world's largest databases, measured in petabytes, or millions of gigabytes. In the latest tests, 21,000 gigabytes of data were shipped over shared networks in just six hours -- a third the time it takes without FAST.

Hollywood could benefit next. Because FAST excels at sending big files over large distances, it's a natural for helping Tinseltown distribute its vast trove, says Low. Using FAST, it would take under five seconds to download a DVD-quality movie.

As reported in

March 24, 2003

NEC: Closing In on a Quantum Cruncher

These are heady times in the world of quantum physics. A team of scientists at Japan's NEC (NIPNY) reported a breakthrough that could hasten the arrival of lightning-fast quantum computers. Such devices would have the power to make complex calculations in just a fraction of a second, solving mathematical problems that would require millions of years to solve on today's supercomputers.

The NEC team, led by principal researcher Jaw-Shen Tsai, produced a circuit out of two quantum bits, or qubits. Using microelectronics technology, the team connected a pair of qubits so that they acted as one entity, making it possible to hold the pair in a state known as quantum entanglement for one-billionth of a second. Soon, Tsai expects to increase the duration of entanglement, a key to quantum computing, by 1,000 times. "We just used our old method this time, but we have ideas on how to improve performance," he says. The next goal is to create a "universal gate," or logic gate, a building block of quantum computers, later this year.

One of the many confounding qualities of qubits is that they can exist, like atomic particles, in more than one state at a time. As a result, a single qubit is capable of processing more than one bit of data at once. The two-qubit circuit developed by the NEC team managed four states concurrently. In theory, a 100-qubit system could carry out a number of operations equal to 10 followed by 30 zeros simultaneously.

By Irene M. Kunii

To subscribe online to BusinessWeek magazine, please
click here.

Copyright ©1996-2007 - All rights reserved.