At the heart of quantum computing are qubits, which offer the promise of answering questions that defeat today's machines, but are notoriously delicate and unstable. Microsoft says the qubits on Majorana 2, its new chip, survive for an average of 20 seconds, rather than the milliseconds of Majorana 1. That means the new chip is 1,000 times more reliable an improvement in performance the tech giant compares to the difference between a phone that needs charging every day to one which needs...
