Quantum computing promises to be a revolutionary tool, making short work of equations that classical computers would struggle to ever complete.
"For the first time, we have shown that making the system more redundant and actively detecting and correcting quantum errors provided a gain in the resilience of quantum information,"Qubits are objects as they exist in a mix of quantum states. Where classic objects can have absolute states, a qubit's version of the same state would be best described using probability. As a qubit interacts with other qubits, their probabilities become entangled in computationally useful ways.
Unfortunately, it's not just other qubits that can entwine their states with a non-decided object. Everything in the environment acts as 'noise', potentially influencing those delicate probabilities and making room for errors. Part of the reason scientists have struggled to implement QEC is because it can introduce errors of its own. The extra space afforded for error correction can make the qubit even more vulnerable to interference from the surrounding environment.
Like many quantum physics experiments, this one was run at ultra-cold temperatures – a hundred times colder than outer space, in this case. The setup has to be carefully controlled in order to protect the qubit as much as possible. The error-corrected qubit lasted for 1.8 milliseconds – only a blink as we might experience it, but an impressive span for a qubit operating on the quantum level. Now the research team will be able to refine the process further.Devoret."It's more than just a proof-of-principle demonstration."
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