IBM Says It's Made a Big Breakthrough in Quantum Computing

upstart writes:

IBM Says It's Made a Big Breakthrough in Quantum Computing:

[...] Scientists at IBM say they've developed a method to manage the unreliability inherent in quantum processors, possibly providing a long-awaited breakthrough toward making quantum computers as practical as conventional ones - or even moreso.

The advancement, detailed in a study published in the journal Nature, comes nearly four years after Google eagerly declared "quantum supremacy" when its scientists claimed they demonstrated that their quantum computer could outperform a classical one.

Though still a milestone, those claims of "quantum supremacy" didn't exactly pan out. Google's experiment was criticized as having no real world merit, and it wasn't long until other experiments demonstrated classical supercomputers could still outpace Google's.

IBM's researchers, though, sound confident that this time the gains are for real.

"We're entering this phase of quantum computing that I call utility," Jay Gambetta, an IBM Fellow and vice president of IBM Quantum Research, told The New York Times. "The era of utility."

[...] These spooky principles allow for a far smaller number of qubits to rival the processing power of regular bits, which can only be a binary one or zero. Sounds great, but at the quantum level, particles eerily exist at uncertain states, arising in a pesky randomness known as quantum noise.

Managing this noise is key to getting practical results from a quantum computer. A slight change in temperature, for example, could cause a qubit to change state or lose superposition.

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