Why haven’t we got useful quantum computers yet?


Quantum computer systems are right here, however aren’t but notably helpful

John D/Getty Photographs

Quantum computer systems have lengthy promised to unravel sure issues sooner than any abnormal, or classical, pc can. In actual fact, Google delivered on this promise in 2019, when it declared that its quantum pc had achieved quantum supremacy, performing a calculation unattainable for the perfect classical computer systems of the day. As New Scientist mentioned on the time, Google had “secured yet one more place within the historical past books”.

But the following chapter of the quantum revolution is struggling to be written. Since …