A research team succeeded in executing the world's fastest two-qubit gate (a fundamental arithmetic element essential for quantum computing) using a completely new method of manipulating, with an ultrafast laser, micrometer-spaced atoms cooled to absolute zero temperature. For the past two decade
Figure 1. Conceptual diagram of the world’s fastest two-qubit gate. Two atoms captured in optical tweezers with a separation of a micrometer are manipulated by a ultrafast laser pulse shone for only 10 picoseconds. Credit: Dr. Takafumi Tomita
A research team succeeded in executing the world’s fastest two-qubit gate using a completely new method of manipulating, with an ultrafast laser, micrometer-spaced atoms cooled toFor the past two decades, all quantum computer hardware has been pursuing faster gates to escape the effects of external noise that can degrade computational-based quantum computers are quickly attracting attention from industry, academia, and government around the world as revolutionary hardware that breaks through...
separated by a micron or so . By manipulating the atoms with a special laser light shone for 10 picoseconds , they succeeded in executing the world’s fastest two-qubit gate,, which operates in just 6.5 nanoseconds . This ultrafast quantum computer,, is expected to be a completely new quantum computer hardware that breaks through the limitations of the superconducting and trapped-ion types currently in development.
. The research team is led by graduate student Yeelai Chew, Assistant Professor Sylvain de Léséleuc and Professor Kenji Ohmori at the Institute for Molecular Science, National Institutes of Natural Sciences.. Research backgroundCold-atom quantum computers are based on laser cooling and trapping techniques celebrated by the Nobel Prizes of 1997 and 2018 .
Figure 3. Operation of the quantum gate. When atom 1 is in the “0” state, nothing happens. When atom 1 is in the “1” state, the sign of the superposition of atom 2 is changed from positive to negative. This operation is at the heart of quantum algorithm that runs on quantum computers. Credit: Dr. Takafumi Tomita Quantum gates are the basic arithmetic elements that make up quantum computing. They correspond to the logic gates such as AND and OR in conventional classical computers.
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