Japanese Invent Scheme That May Revolutionize Quantum Computing

Tokyo, Sept. 23 (Jiji Press)--Japanese scientists have announced that they invented a quantum computing scheme to carry out a far larger number of calculations efficiently than existing quantum computers. Under the scheme, many pulses of light, each carrying information, are let to go around in a loop circuit indefinitely. The circuit performs multiple tasks, switching from one task to another rapidly through instant manipulations of the pulses. The invention was announced in an article by University of Tokyo Prof. Akira Furusawa and Assistant Prof. Shuntaro Takeda, posted on an electronic version of the U.S. journal Physical Review Letters. "We'll start work to develop the hardware, now that we've resolved all problems except how to make a scheme that automatically corrects a calculation error," Furusawa said. In 2013, Furusawa's team developed a basic system for optical quantum computing. The system requires more than 500 mirrors and lenses and occupies space 4.2 meters long and 1.5 meters wide, while it can handle only one pulse. To boost the capacities, many units need to be connected. But that is difficult given the size and complicated structure of the system. In the new scheme, a single circuit plays the role of many such systems. In other types of quantum computers, including those using superconducting circuits, some are capable of handling up to dozens of qubits, or quantum bits, the basic unit of information in quantum computing. Furusawa's new scheme will allow a single circuit to process more than one million qubits theoretically, his team said in a press release, calling it an "ultimate" quantum computing scheme. END