Bbc Tech
BBC Tech

Google claims 'quantum supremacy' for computer

Google says an advanced computer has achieved “quantum supremacy” for the first time, surpassing the performance of conventional devices.

The technology giant’s Sycamore quantum processor was able to perform a specific task in 200 seconds that would take the world’s best supercomputers 10,000 years to complete.

Scientists have been working on quantum computers for decades because they promise much faster speeds.

The result appears in Nature journal.

In classical computers, the unit of information is called a “bit” and can have a value of either 1 or 0. But its equivalent in a quantum system – the qubit (quantum bit) – can be both 1 and 0 at the same time.

This phenomenon opens the door for multiple calculations to be performed simultaneously. But the qubits need to be synchronised using a quantum effect known as entanglement, which Albert Einstein termed “spooky action at a distance”.

However, scientists have struggled to build working devices with enough qubits to make them competitive with conventional types of computer…

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