A new phase of matter has been observed in a quantum computer after physicists pulsed light on its qubits in a pattern inspired by the Fibonacci sequence.
If you think that's mind-boggling, this weird quirk of quantum mechanics behaves as though it has two time dimensions, instead of one; a trait that scientists say makes the qubits more robust, able to remain stable for the entire duration of the experiment.This stability is called quantum coherence, and it's one of the main goals for an error-free quantum computer – and one of the most difficult to achieve.
But the blurred, unsettled nature of a series of qubits also depends on how their undecided states relate to one another – a relationship calledFrustratingly, qubits can entangle with just about anything in its environment, introducing errors. The more delicate a qubit's blurry state is , the greater the risk of it losing this coherence.
Enforcing a symmetry can be one means of protecting qubits from decoherence. Rotate a plain old square ninety degrees, and it's still effectively the same shape. This symmetry protects it from certain rotational effects.
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