Beryllium ions that keep their cool can store and transfer information, bringing powerful quantum computers a step closer to reality. Researchers combined all of the ingredients required for a functional quantum computer and found the parts could operate reliably, a study appearing online August 6 in Science reports.
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“This is one of the most advanced systems that has ever been reported,” comments Steven Olmschenk of the University of Maryland in College Park.
Quantum computers have the potential to breeze through calculations much faster than conventional computers, making them useful for tasks like code-breaking. In traditional computers, each bit of information is stored as a 0 or a 1. But quantum bits take advantage of a strange property called superposition, meaning each bit can hold 0s and 1s simultaneously. Superposition may give quantum computers greater number-crunching ability.
In the new study, two beryllium ions served as quantum bits, or qubits, by holding information in an internal property known as the spin state. Magnetic fields moved the ions to different spots inside a vacuum, where laser pulses performed a series of logic operations on the beryllium ions. For example, if one qubit has a state represented by a 0, then a laser pulse would convert the other to a state represented by a 1, says study coauthor Jonathan Home of the National Institute of Standards and Technology lab in Boulder, Colo. For each series, the beryllium ions successfully performed five such logic operations. The ions also moved almost a millimeter while performing each series (transport of ions is required for a practical quantum computer).