[ Back to EurekAlert! ] Public release date: 3-May-2007
[ | E-mail Share Share ]

Contact: Kazuko Andersen
kazuko.andersen@necam.com
212-326-2502
NEC Corporation of America

NEC, JST and RIKEN successfully demonstrate world's first controllably coupled qubits

Newly developed circuit technology enables execution of quantum algorithm

Tokyo, May 3, 2007--NEC Corporation, Japan Science and Technology Agency (JST) and the Institute of Physical and Chemical Research (RIKEN) have together successfully demonstrated the world's first quantum bit (qubit) circuit that can control the strength of coupling between qubits. Technology achieving control of the coupling strength between qubits is vital to the realization of a practical quantum computer, and has been long awaited in the scientific field.

The quantum computer, when it is finally brought to fruition, is expected to far surpass the capabilities of even the most modern of today's supercomputers. Actual computing in a quantum computer is carried out by manipulating the quantum state of qubits in time sequence by external controls. To achieve such manipulation, it is necessary to control the: 1. States of individual qubits, 2. States of two qubits (logic operation), and 3. Ability to turn on /off the coupling between qubits.

NEC, JST, and RIKEN have already announced successful development of key technologies for the world's first solid-state qubit and the world's first two-qubit logic gate, based on solid-state technology that excels in its ability to integrate qubits. Following these achievements, the research group addressed the controllable coupling of qubits as the next logical step in realization of a practical quantum computer. Their new research result represents the world's first successful demonstration of controllably coupled qubits.

To date, the coupling of qubits has been difficult to control. In order to realize this control, the research group devised an original mechanism that employs another qubit in between the two qubits for coupling. The coupling qubit functions as a non-linear transformer that is able to turn on and off the magnetic coupling between the two qubits, and on/off control is achieved simply by inputting a microwave. Moreover, coupling operation has been achieved without shortening the lifetime of each qubit. Scalability is also realized through the repetition of coupled two-qubit units - a feature necessary for future quantum computers.

To demonstrate the operation feasibility of the controllable coupling scheme, the research group employed a coupled two-qubit system, the smallest quantum logic unit, to carry out a multi-quantum control experiment involving the turning on and off of the coupling. As a result, a simple quantum protocol has been successfully demonstrated, allowing controllable coupling for the execution of quantum algorithms.

In the near future, NEC, JST, and RIKEN, plan to implement a larger-scale, more elaborate quantum computation, aiming for the realization of a practical quantum computer.

The result of this joint research will be published in the May 4th issue of the international weekly science journal, Science, published by the American Association for the Advancement of Science (AAAS).

###

Paper Title: Quantum Coherent Tunable Coupling of Superconducting Qubits

A part of this research has been carried out under the following JST project:

NEC PRESS CONTACTS

Japan

Diane Foley
d-foley@ax.jp.nec.com
+81-3-3798-6511 Asia Pacific

Masako Hirano
m-hirano@bccs.nec.com.sg
+65-63792570

Europe

Chris Shimizu
chris.shimizu@uk.neceur.com
+44-20-8752-2794

America

Kazuko Andersen
Kazuko.Andersen@necam.com
+1- 212-326-2502

RIKEN PRESS CONTACT

Public Relations Office
RIKEN
+81-48-467-9272

JST PRESS CONTACT

Mikiko FUKUSHIMA
Public Relations Division
Japan Science and Technology Agency
+81-3-5214-8404



[ Back to EurekAlert! ] [ | E-mail Share Share ]

 


AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert! system.