Technology
An innovative system featuring 6100 ultracold caesium atoms manipulated by lasers has emerged as the largest assembly of qubits ever created, positioning researchers closer to developing the most sophisticated quantum computer in existence.
Quantum computers can be made using arrays of atoms
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A groundbreaking device featuring over 6000 quantum bits, or qubits, has shattered previous records, marking a significant stride toward the development of the largest quantum computer to date.
While there is no universally accepted design to fabricate a quantum computer, experts contend that for these machines to be practically effective, they must consist of at least tens of thousands of qubits. The previous record was held by a quantum processor developed by Atom Computing, which utilized 1180 qubits. However, a pioneering team led by Hannah Manetsch from the California Institute of Technology has successfully created a device with 6100 qubits.
Each qubit consists of a neutral caesium atom cooled to temperatures nearing absolute zero and manipulated precisely using laser beams. These 6100 qubits are arranged systematically within a grid formation. Manetsch noted that the qubits have been engineered with exceptional qualities conducive for computations, although no actual computations have been performed as of yet.
For example, the researchers have precisely calibrated the frequency and intensity of the lasers to guarantee the delicately sensitive qubits maintain their quantum states effectively, allowing the grid to stay stable for extended periods. This stability is crucial for enhanced computation accuracy and prolonged operational durations for a prospective quantum computer. The research team has also experimented with the ability of lasers to move qubits around the array, which is a vital aspect of executing computations, explained team member Elie Bataille, also from the California Institute of Technology.
“This is a remarkable demonstration of the straightforward scalability that neutral atoms provide,” states Ben Bloom at Atom Computing, which also utilizes neutral atoms in its technology.
Mark Saffman of the University of Wisconsin-Madison has expressed optimism about this latest experiment, viewing it as promising validation that neutral atom quantum computers can achieve considerable scale. However, he also emphasizes that further experimental validations are necessary before the setup can be fully classified as a complete quantum computer.
The researchers are now delving into optimal strategies for getting their qubits to process computations and to do so in an error-free manner, indicates team member Kon Leung, who is also affiliated with Caltech. Ultimately, the team envisions scaling up their machine to reach one million qubits within the next decade, Leung notes.
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